Merge pull request #16021 from vespa-engine/revert-16019-revert-16012-revert-16003-revert-15987-revert-15983-revert-15979-revert-15978-revert-15977-hmusum/remove-unnecessary-component

Use just one HostRegistry [run-systemtest]

44 files changed, 255 insertions, 305 deletions

diff --git a/configserver/src/main/java/com/yahoo/vespa/config/server/GlobalComponentRegistry.java b/configserver/src/main/java/com/yahoo/vespa/config/server/GlobalComponentRegistry.java
index 1eb18773898..49a61eb8dee 100644
--- a/configserver/src/main/java/com/yahoo/vespa/config/server/GlobalComponentRegistry.java
+++ b/configserver/src/main/java/com/yahoo/vespa/config/server/GlobalComponentRegistry.java
@@ -1,4 +1,4 @@
-// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
 package com.yahoo.vespa.config.server;
 
 import com.yahoo.cloud.config.ConfigserverConfig;
@@ -9,7 +9,7 @@ import com.yahoo.config.provision.TenantName;
 import com.yahoo.config.provision.Zone;
 import com.yahoo.container.jdisc.secretstore.SecretStore;
 import com.yahoo.vespa.config.server.application.PermanentApplicationPackage;
-import com.yahoo.vespa.config.server.host.HostRegistries;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.modelfactory.ModelFactoryRegistry;
 import com.yahoo.vespa.config.server.monitoring.Metrics;
 import com.yahoo.vespa.config.server.session.SessionPreparer;
@@ -38,7 +38,6 @@ public interface GlobalComponentRegistry {
     ReloadListener getReloadListener();
     ConfigDefinitionRepo getStaticConfigDefinitionRepo();
     PermanentApplicationPackage getPermanentApplicationPackage();
-    HostRegistries getHostRegistries();
     ModelFactoryRegistry getModelFactoryRegistry();
     Optional<Provisioner> getHostProvisioner();
     Zone getZone();
diff --git a/configserver/src/main/java/com/yahoo/vespa/config/server/InjectedGlobalComponentRegistry.java b/configserver/src/main/java/com/yahoo/vespa/config/server/InjectedGlobalComponentRegistry.java
index 9badd19009f..5760eae866c 100644
--- a/configserver/src/main/java/com/yahoo/vespa/config/server/InjectedGlobalComponentRegistry.java
+++ b/configserver/src/main/java/com/yahoo/vespa/config/server/InjectedGlobalComponentRegistry.java
@@ -1,4 +1,4 @@
-// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
 package com.yahoo.vespa.config.server;
 
 import com.google.inject.Inject;
@@ -11,7 +11,7 @@ import com.yahoo.config.provision.TenantName;
 import com.yahoo.config.provision.Zone;
 import com.yahoo.container.jdisc.secretstore.SecretStore;
 import com.yahoo.vespa.config.server.application.PermanentApplicationPackage;
-import com.yahoo.vespa.config.server.host.HostRegistries;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.modelfactory.ModelFactoryRegistry;
 import com.yahoo.vespa.config.server.monitoring.Metrics;
 import com.yahoo.vespa.config.server.provision.HostProvisionerProvider;
@@ -44,7 +44,6 @@ public class InjectedGlobalComponentRegistry implements GlobalComponentRegistry
     private final ConfigserverConfig configserverConfig;
     private final ConfigDefinitionRepo staticConfigDefinitionRepo;
     private final PermanentApplicationPackage permanentApplicationPackage;
-    private final HostRegistries hostRegistries;
     private final Optional<Provisioner> hostProvisioner;
     private final Zone zone;
     private final ConfigServerDB configServerDB;
@@ -52,6 +51,7 @@ public class InjectedGlobalComponentRegistry implements GlobalComponentRegistry
     private final SecretStore secretStore;
     private final StripedExecutor<TenantName> zkWatcherExecutor;
     private final ExecutorService zkCacheExecutor;
+    private final HostRegistry hostRegistry;
 
     @SuppressWarnings("WeakerAccess")
     @Inject
@@ -62,15 +62,14 @@ public class InjectedGlobalComponentRegistry implements GlobalComponentRegistry
                                            SessionPreparer sessionPreparer,
                                            RpcServer rpcServer,
                                            ConfigserverConfig configserverConfig,
-                                           SuperModelGenerationCounter superModelGenerationCounter,
                                            ConfigDefinitionRepo staticConfigDefinitionRepo,
                                            PermanentApplicationPackage permanentApplicationPackage,
-                                           HostRegistries hostRegistries,
                                            HostProvisionerProvider hostProvisionerProvider,
                                            Zone zone,
                                            ConfigServerDB configServerDB,
                                            FlagSource flagSource,
-                                           SecretStore secretStore) {
+                                           SecretStore secretStore,
+                                           HostRegistry hostRegistry) {
         this.curator = curator;
         this.configCurator = configCurator;
         this.metrics = metrics;
@@ -80,7 +79,6 @@ public class InjectedGlobalComponentRegistry implements GlobalComponentRegistry
         this.configserverConfig = configserverConfig;
         this.staticConfigDefinitionRepo = staticConfigDefinitionRepo;
         this.permanentApplicationPackage = permanentApplicationPackage;
-        this.hostRegistries = hostRegistries;
         this.hostProvisioner = hostProvisionerProvider.getHostProvisioner();
         this.zone = zone;
         this.configServerDB = configServerDB;
@@ -88,6 +86,7 @@ public class InjectedGlobalComponentRegistry implements GlobalComponentRegistry
         this.secretStore = secretStore;
         this.zkWatcherExecutor = new StripedExecutor<>();
         this.zkCacheExecutor = Executors.newFixedThreadPool(1, ThreadFactoryFactory.getThreadFactory(TenantRepository.class.getName()));
+        this.hostRegistry = hostRegistry;
     }
 
     @Override
@@ -109,8 +108,6 @@ public class InjectedGlobalComponentRegistry implements GlobalComponentRegistry
     @Override
     public PermanentApplicationPackage getPermanentApplicationPackage() { return permanentApplicationPackage; }
     @Override
-    public HostRegistries getHostRegistries() { return hostRegistries; }
-    @Override
     public ModelFactoryRegistry getModelFactoryRegistry() { return modelFactoryRegistry; }
 
     @Override
@@ -146,4 +143,5 @@ public class InjectedGlobalComponentRegistry implements GlobalComponentRegistry
     public SecretStore getSecretStore() {
         return secretStore;
     }
+
 }
diff --git a/configserver/src/main/java/com/yahoo/vespa/config/server/ReloadListener.java b/configserver/src/main/java/com/yahoo/vespa/config/server/ReloadListener.java
index 773a4862033..7cdb596780a 100644
--- a/configserver/src/main/java/com/yahoo/vespa/config/server/ReloadListener.java
+++ b/configserver/src/main/java/com/yahoo/vespa/config/server/ReloadListener.java
@@ -1,8 +1,7 @@
-// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
 package com.yahoo.vespa.config.server;
 
 import com.yahoo.config.provision.ApplicationId;
-import com.yahoo.config.provision.TenantName;
 import com.yahoo.vespa.config.server.application.ApplicationSet;
 
 import java.util.Collection;
@@ -17,21 +16,21 @@ import java.util.Collection;
 public interface ReloadListener {
 
     /**
-     * Signal the listener that hosts used by by a particular tenant.
+     * Signals the listener that hosts used by a particular tenant.
      *
-     * @param tenant Name of tenant.
+     * @param applicationId application id
      * @param newHosts a {@link Collection} of hosts used by tenant.
      */
-    void hostsUpdated(TenantName tenant, Collection<String> newHosts);
+    void hostsUpdated(ApplicationId applicationId, Collection<String> newHosts);
 
     /**
-     * Verify that given hosts are available for use by tenant.
+     * Verifies that given hosts are available for use by tenant.
      *
-     * @param tenant tenant that wants to allocate hosts.
+     * @param applicationId application id
      * @param newHosts a {@link java.util.Collection} of hosts that tenant wants to allocate.
      * @throws java.lang.IllegalArgumentException if one or more of the hosts are in use by another tenant.
      */
-    void verifyHostsAreAvailable(TenantName tenant, Collection<String> newHosts);
+    void verifyHostsAreAvailable(ApplicationId applicationId, Collection<String> newHosts);
 
     /**
      * Configs has been activated for an application: Either an application
diff --git a/configserver/src/main/java/com/yahoo/vespa/config/server/application/TenantApplications.java b/configserver/src/main/java/com/yahoo/vespa/config/server/application/TenantApplications.java
index 5a34217dbdd..0e5315c0dcc 100644
--- a/configserver/src/main/java/com/yahoo/vespa/config/server/application/TenantApplications.java
+++ b/configserver/src/main/java/com/yahoo/vespa/config/server/application/TenantApplications.java
@@ -27,7 +27,6 @@ import com.yahoo.vespa.curator.Curator;
 import com.yahoo.vespa.curator.Lock;
 import com.yahoo.vespa.curator.transaction.CuratorTransaction;
 import org.apache.curator.framework.CuratorFramework;
-import org.apache.curator.framework.recipes.cache.ChildData;
 import org.apache.curator.framework.recipes.cache.PathChildrenCacheEvent;
 
 import java.nio.file.Files;
@@ -62,7 +61,7 @@ public class TenantApplications implements RequestHandler, HostValidator<Applica
     private final TenantName tenant;
     private final ReloadListener reloadListener;
     private final ConfigResponseFactory responseFactory;
-    private final HostRegistry<ApplicationId> hostRegistry;
+    private final HostRegistry hostRegistry;
     private final ApplicationMapper applicationMapper = new ApplicationMapper();
     private final MetricUpdater tenantMetricUpdater;
     private final Clock clock;
@@ -70,7 +69,7 @@ public class TenantApplications implements RequestHandler, HostValidator<Applica
 
     public TenantApplications(TenantName tenant, Curator curator, StripedExecutor<TenantName> zkWatcherExecutor,
                               ExecutorService zkCacheExecutor, Metrics metrics, ReloadListener reloadListener,
-                              ConfigserverConfig configserverConfig, HostRegistry<ApplicationId> hostRegistry,
+                              ConfigserverConfig configserverConfig, HostRegistry hostRegistry,
                               TenantFileSystemDirs tenantFileSystemDirs, Clock clock) {
         this.database = new ApplicationCuratorDatabase(tenant, curator);
         this.tenant = tenant;
@@ -88,7 +87,7 @@ public class TenantApplications implements RequestHandler, HostValidator<Applica
     }
 
     // For testing only
-    public static TenantApplications create(GlobalComponentRegistry componentRegistry, TenantName tenantName) {
+    public static TenantApplications create(GlobalComponentRegistry componentRegistry, HostRegistry hostRegistry, TenantName tenantName) {
         return new TenantApplications(tenantName,
                                       componentRegistry.getCurator(),
                                       componentRegistry.getZkWatcherExecutor(),
@@ -96,7 +95,7 @@ public class TenantApplications implements RequestHandler, HostValidator<Applica
                                       componentRegistry.getMetrics(),
                                       componentRegistry.getReloadListener(),
                                       componentRegistry.getConfigserverConfig(),
-                                      componentRegistry.getHostRegistries().createApplicationHostRegistry(tenantName),
+                                      hostRegistry,
                                       new TenantFileSystemDirs(componentRegistry.getConfigServerDB(), tenantName),
                                       componentRegistry.getClock());
     }
@@ -222,7 +221,10 @@ public class TenantApplications implements RequestHandler, HostValidator<Applica
     }
 
     private void notifyReloadListeners(ApplicationSet applicationSet) {
-        reloadListener.hostsUpdated(tenant, hostRegistry.getAllHosts());
+        if (applicationSet.getAllApplications().isEmpty()) throw new IllegalArgumentException("application set cannot be empty");
+
+        reloadListener.hostsUpdated(applicationSet.getAllApplications().get(0).toApplicationInfo().getApplicationId(),
+                                    applicationSet.getAllHosts());
         reloadListener.configActivated(applicationSet);
     }
 
@@ -271,7 +273,7 @@ public class TenantApplications implements RequestHandler, HostValidator<Applica
     }
 
     private void reloadListenersOnRemove(ApplicationId applicationId) {
-        reloadListener.hostsUpdated(tenant, hostRegistry.getAllHosts());
+        reloadListener.hostsUpdated(applicationId, hostRegistry.getHostsForKey(applicationId));
         reloadListener.applicationRemoved(applicationId);
     }
 
@@ -382,9 +384,9 @@ public class TenantApplications implements RequestHandler, HostValidator<Applica
     }
 
     @Override
-    public void verifyHosts(ApplicationId key, Collection<String> newHosts) {
-        hostRegistry.verifyHosts(key, newHosts);
-        reloadListener.verifyHostsAreAvailable(tenant, newHosts);
+    public void verifyHosts(ApplicationId applicationId, Collection<String> newHosts) {
+        hostRegistry.verifyHosts(applicationId, newHosts);
+        reloadListener.verifyHostsAreAvailable(applicationId, newHosts);
     }
 
     public HostValidator<ApplicationId> getHostValidator() {
diff --git a/configserver/src/main/java/com/yahoo/vespa/config/server/host/HostRegistries.java b/configserver/src/main/java/com/yahoo/vespa/config/server/host/HostRegistries.java
deleted file mode 100644
index c25ab0315a3..00000000000
--- a/configserver/src/main/java/com/yahoo/vespa/config/server/host/HostRegistries.java
+++ /dev/null
@@ -1,34 +0,0 @@
-// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
-package com.yahoo.vespa.config.server.host;
-
-import com.yahoo.config.provision.ApplicationId;
-import com.yahoo.config.provision.TenantName;
-
-import java.util.Map;
-import java.util.concurrent.ConcurrentHashMap;
-
-/**
- * Component to hold host registries.
- *
- * @author hmusum
- */
-public class HostRegistries {
-
-    private final HostRegistry<TenantName> tenantHostRegistry = new HostRegistry<>();
-    private final Map<TenantName, HostRegistry<ApplicationId>> applicationHostRegistries = new ConcurrentHashMap<>();
-
-    public HostRegistry<TenantName> getTenantHostRegistry() {
-        return tenantHostRegistry;
-    }
-
-    public HostRegistry<ApplicationId> getApplicationHostRegistry(TenantName tenant) {
-        return applicationHostRegistries.get(tenant);
-    }
-
-    public HostRegistry<ApplicationId> createApplicationHostRegistry(TenantName tenant) {
-        HostRegistry<ApplicationId> applicationIdHostRegistry = new HostRegistry<>();
-        applicationHostRegistries.put(tenant, applicationIdHostRegistry);
-        return applicationIdHostRegistry;
-    }
-
-}
diff --git a/configserver/src/main/java/com/yahoo/vespa/config/server/host/HostRegistry.java b/configserver/src/main/java/com/yahoo/vespa/config/server/host/HostRegistry.java
index ec37f2598e0..d45764295dd 100644
--- a/configserver/src/main/java/com/yahoo/vespa/config/server/host/HostRegistry.java
+++ b/configserver/src/main/java/com/yahoo/vespa/config/server/host/HostRegistry.java
@@ -1,12 +1,18 @@
-// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
 package com.yahoo.vespa.config.server.host;
 
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.logging.Logger;
 import java.util.stream.Collectors;
 
 import com.google.common.collect.Collections2;
+import com.yahoo.config.provision.ApplicationId;
+import com.yahoo.config.provision.TenantName;
+
 import java.util.logging.Level;
 
 /**
@@ -15,20 +21,20 @@ import java.util.logging.Level;
  *
  * @author Ulf Lilleengen
  */
-public class HostRegistry<T> implements HostValidator<T> {
+public class HostRegistry implements HostValidator<ApplicationId> {
 
     private static final Logger log = Logger.getLogger(HostRegistry.class.getName());
 
-    private final Map<String, T> host2KeyMap = new ConcurrentHashMap<>();
+    private final Map<String, ApplicationId> host2KeyMap = new ConcurrentHashMap<>();
 
-    public T getKeyForHost(String hostName) {
+    public ApplicationId getKeyForHost(String hostName) {
         return host2KeyMap.get(hostName);
     }
 
-    public synchronized void update(T key, Collection<String> newHosts) {
+    public synchronized void update(ApplicationId key, Collection<String> newHosts) {
         verifyHosts(key, newHosts);
         Collection<String> currentHosts = getHostsForKey(key);
-        log.log(Level.FINE, () -> "Setting hosts for key '" + key + "', " +
+        log.log(Level.INFO, () -> "Setting hosts for key '" + key + "', " +
                 "newHosts: " + newHosts + ", " +
                 "currentHosts: " + currentHosts);
         Collection<String> removedHosts = getRemovedHosts(newHosts, currentHosts);
@@ -37,7 +43,7 @@ public class HostRegistry<T> implements HostValidator<T> {
     }
 
     @Override
-    public synchronized void verifyHosts(T key, Collection<String> newHosts) {
+    public synchronized void verifyHosts(ApplicationId key, Collection<String> newHosts) {
         for (String host : newHosts) {
             if (hostAlreadyTaken(host, key)) {
                 throw new IllegalArgumentException("'" + key + "' tried to allocate host '" + host + 
@@ -46,22 +52,26 @@ public class HostRegistry<T> implements HostValidator<T> {
         }
     }
 
-    public synchronized void removeHostsForKey(T key) {
+    public synchronized void removeHostsForKey(ApplicationId key) {
         host2KeyMap.entrySet().removeIf(entry -> entry.getValue().equals(key));
     }
 
+    public synchronized void removeHostsForKey(TenantName key) {
+        host2KeyMap.entrySet().removeIf(entry -> entry.getValue().tenant().equals(key));
+    }
+
     public synchronized Collection<String> getAllHosts() {
         return Collections.unmodifiableCollection(new ArrayList<>(host2KeyMap.keySet()));
     }
 
-    synchronized Collection<String> getHostsForKey(T key) {
+    public synchronized Collection<String> getHostsForKey(ApplicationId key) {
         return host2KeyMap.entrySet().stream()
                 .filter(entry -> entry.getValue().equals(key))
                 .map(Map.Entry::getKey)
                 .collect(Collectors.toSet());
     }
 
-    private boolean hostAlreadyTaken(String host, T key) {
+    private boolean hostAlreadyTaken(String host, ApplicationId key) {
         return host2KeyMap.containsKey(host) && !key.equals(host2KeyMap.get(host));
     }
 
@@ -76,7 +86,7 @@ public class HostRegistry<T> implements HostValidator<T> {
         }
     }
 
-    private void addHosts(T key, Collection<String> newHosts) {
+    private void addHosts(ApplicationId key, Collection<String> newHosts) {
         for (String host : newHosts) {
             log.log(Level.FINE, () -> "Adding " + host);
             host2KeyMap.put(host, key);
diff --git a/configserver/src/main/java/com/yahoo/vespa/config/server/rpc/RpcServer.java b/configserver/src/main/java/com/yahoo/vespa/config/server/rpc/RpcServer.java
index e64859e7267..370ae72bbbd 100644
--- a/configserver/src/main/java/com/yahoo/vespa/config/server/rpc/RpcServer.java
+++ b/configserver/src/main/java/com/yahoo/vespa/config/server/rpc/RpcServer.java
@@ -34,7 +34,6 @@ import com.yahoo.vespa.config.server.RequestHandler;
 import com.yahoo.vespa.config.server.SuperModelRequestHandler;
 import com.yahoo.vespa.config.server.application.ApplicationSet;
 import com.yahoo.vespa.config.server.filedistribution.FileServer;
-import com.yahoo.vespa.config.server.host.HostRegistries;
 import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.monitoring.MetricUpdater;
 import com.yahoo.vespa.config.server.monitoring.MetricUpdaterFactory;
@@ -92,7 +91,7 @@ public class RpcServer implements Runnable, ReloadListener, TenantListener {
 
     private final DelayedConfigResponses delayedConfigResponses;
 
-    private final HostRegistry<TenantName> hostRegistry;
+    private final HostRegistry hostRegistry;
     private final Map<TenantName, Tenant> tenants = new ConcurrentHashMap<>();
     private final Map<ApplicationId, ApplicationState> applicationStateMap = new ConcurrentHashMap<>();
     private final SuperModelRequestHandler superModelRequestHandler;
@@ -122,7 +121,7 @@ public class RpcServer implements Runnable, ReloadListener, TenantListener {
      */
     @Inject
     public RpcServer(ConfigserverConfig config, SuperModelRequestHandler superModelRequestHandler,
-                     MetricUpdaterFactory metrics, HostRegistries hostRegistries,
+                     MetricUpdaterFactory metrics, HostRegistry hostRegistry,
                      HostLivenessTracker hostLivenessTracker, FileServer fileServer, RpcAuthorizer rpcAuthorizer,
                      RpcRequestHandlerProvider handlerProvider) {
         this.superModelRequestHandler = superModelRequestHandler;
@@ -136,7 +135,7 @@ public class RpcServer implements Runnable, ReloadListener, TenantListener {
                 0, TimeUnit.SECONDS, workQueue, ThreadFactoryFactory.getDaemonThreadFactory(THREADPOOL_NAME));
         delayedConfigResponses = new DelayedConfigResponses(this, config.numDelayedResponseThreads());
         spec = new Spec(null, config.rpcport());
-        hostRegistry = hostRegistries.getTenantHostRegistry();
+        this.hostRegistry = hostRegistry;
         this.useRequestVersion = config.useVespaVersionInRequest();
         this.hostedVespa = config.hostedVespa();
         this.canReturnEmptySentinelConfig = config.canReturnEmptySentinelConfig();
@@ -303,14 +302,14 @@ public class RpcServer implements Runnable, ReloadListener, TenantListener {
     }
 
     @Override
-    public void hostsUpdated(TenantName tenant, Collection<String> newHosts) {
+    public void hostsUpdated(ApplicationId applicationId, Collection<String> newHosts) {
         log.log(Level.FINE, "Updating hosts in tenant host registry '" + hostRegistry + "' with " + newHosts);
-        hostRegistry.update(tenant, newHosts);
+        hostRegistry.update(applicationId, newHosts);
     }
 
     @Override
-    public void verifyHostsAreAvailable(TenantName tenant, Collection<String> newHosts) {
-        hostRegistry.verifyHosts(tenant, newHosts);
+    public void verifyHostsAreAvailable(ApplicationId applicationId, Collection<String> newHosts) {
+        hostRegistry.verifyHosts(applicationId, newHosts);
     }
 
     @Override
@@ -334,8 +333,8 @@ public class RpcServer implements Runnable, ReloadListener, TenantListener {
     Optional<TenantName> resolveTenant(JRTServerConfigRequest request, Trace trace) {
         if ("*".equals(request.getConfigKey().getConfigId())) return Optional.of(ApplicationId.global().tenant());
         String hostname = request.getClientHostName();
-        TenantName tenant = hostRegistry.getKeyForHost(hostname);
-        if (tenant == null) {
+        ApplicationId applicationId = hostRegistry.getKeyForHost(hostname);
+        if (applicationId == null) {
             if (GetConfigProcessor.logDebug(trace)) {
                 String message = "Did not find tenant for host '" + hostname + "', using " + TenantName.defaultName();
                 log.log(Level.FINE, message);
@@ -344,7 +343,7 @@ public class RpcServer implements Runnable, ReloadListener, TenantListener {
             }
             return Optional.empty();
         }
-        return Optional.of(tenant);
+        return Optional.of(applicationId.tenant());
     }
 
     public ConfigResponse resolveConfig(JRTServerConfigRequest request, GetConfigContext context, Optional<Version> vespaVersion) {
@@ -425,7 +424,8 @@ public class RpcServer implements Runnable, ReloadListener, TenantListener {
 
     @Override
     public void onTenantDelete(TenantName tenant) {
-        log.log(Level.FINE, TenantRepository.logPre(tenant)+"Tenant deleted, removing request handler and cleaning host registry");
+        log.log(Level.FINE, TenantRepository.logPre(tenant) +
+                            "Tenant deleted, removing request handler and cleaning host registry");
         tenants.remove(tenant);
         hostRegistry.removeHostsForKey(tenant);
     }
diff --git a/configserver/src/main/java/com/yahoo/vespa/config/server/rpc/security/DefaultRpcAuthorizerProvider.java b/configserver/src/main/java/com/yahoo/vespa/config/server/rpc/security/DefaultRpcAuthorizerProvider.java
index 8d1d4f58e37..b00b6db4226 100644
--- a/configserver/src/main/java/com/yahoo/vespa/config/server/rpc/security/DefaultRpcAuthorizerProvider.java
+++ b/configserver/src/main/java/com/yahoo/vespa/config/server/rpc/security/DefaultRpcAuthorizerProvider.java
@@ -1,4 +1,4 @@
-// Copyright 2019 Oath Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
 package com.yahoo.vespa.config.server.rpc.security;
 
 import com.google.inject.Inject;
@@ -6,7 +6,7 @@ import com.yahoo.cloud.config.ConfigserverConfig;
 import com.yahoo.config.provision.security.NodeIdentifier;
 import com.yahoo.container.di.componentgraph.Provider;
 import com.yahoo.security.tls.TransportSecurityUtils;
-import com.yahoo.vespa.config.server.host.HostRegistries;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.rpc.RequestHandlerProvider;
 
 /**
@@ -21,13 +21,13 @@ public class DefaultRpcAuthorizerProvider implements Provider<RpcAuthorizer> {
     @Inject
     public DefaultRpcAuthorizerProvider(ConfigserverConfig config,
                                         NodeIdentifier nodeIdentifier,
-                                        HostRegistries hostRegistries,
+                                        HostRegistry hostRegistry,
                                         RequestHandlerProvider handlerProvider) {
         boolean useMultiTenantAuthorizer =
                 TransportSecurityUtils.isTransportSecurityEnabled() && config.multitenant() && config.hostedVespa();
         this.rpcAuthorizer =
                 useMultiTenantAuthorizer
-                        ? new MultiTenantRpcAuthorizer(nodeIdentifier, hostRegistries, handlerProvider, getThreadPoolSize(config))
+                        ? new MultiTenantRpcAuthorizer(nodeIdentifier, hostRegistry, handlerProvider, getThreadPoolSize(config))
                         : new NoopRpcAuthorizer();
     }
 
diff --git a/configserver/src/main/java/com/yahoo/vespa/config/server/rpc/security/MultiTenantRpcAuthorizer.java b/configserver/src/main/java/com/yahoo/vespa/config/server/rpc/security/MultiTenantRpcAuthorizer.java
index 49a8df3d0e4..8353e3fab1f 100644
--- a/configserver/src/main/java/com/yahoo/vespa/config/server/rpc/security/MultiTenantRpcAuthorizer.java
+++ b/configserver/src/main/java/com/yahoo/vespa/config/server/rpc/security/MultiTenantRpcAuthorizer.java
@@ -1,4 +1,4 @@
-// Copyright 2019 Oath Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
 package com.yahoo.vespa.config.server.rpc.security;
 
 import com.yahoo.cloud.config.SentinelConfig;
@@ -16,7 +16,6 @@ import com.yahoo.security.tls.TransportSecurityUtils;
 import com.yahoo.vespa.config.ConfigKey;
 import com.yahoo.vespa.config.protocol.JRTServerConfigRequestV3;
 import com.yahoo.vespa.config.server.RequestHandler;
-import com.yahoo.vespa.config.server.host.HostRegistries;
 import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.rpc.RequestHandlerProvider;
 
@@ -34,7 +33,6 @@ import java.util.logging.Logger;
 import static com.yahoo.vespa.config.server.rpc.security.AuthorizationException.Type;
 import static com.yahoo.yolean.Exceptions.throwUnchecked;
 
-
 /**
  * A {@link RpcAuthorizer} that perform access control for configserver RPC methods when TLS and multi-tenant mode are enabled.
  *
@@ -45,22 +43,22 @@ public class MultiTenantRpcAuthorizer implements RpcAuthorizer {
     private static final Logger log = Logger.getLogger(MultiTenantRpcAuthorizer.class.getName());
 
     private final NodeIdentifier nodeIdentifier;
-    private final HostRegistry<TenantName> hostRegistry;
+    private final HostRegistry hostRegistry;
     private final RequestHandlerProvider handlerProvider;
     private final Executor executor;
 
     public MultiTenantRpcAuthorizer(NodeIdentifier nodeIdentifier,
-                                    HostRegistries hostRegistries,
+                                    HostRegistry hostRegistry,
                                     RequestHandlerProvider handlerProvider,
                                     int threadPoolSize) {
         this(nodeIdentifier,
-             hostRegistries.getTenantHostRegistry(),
+             hostRegistry,
              handlerProvider,
              Executors.newFixedThreadPool(threadPoolSize, new DaemonThreadFactory("multi-tenant-rpc-authorizer-")));
     }
 
     MultiTenantRpcAuthorizer(NodeIdentifier nodeIdentifier,
-                             HostRegistry<TenantName> hostRegistry,
+                             HostRegistry hostRegistry,
                              RequestHandlerProvider handlerProvider,
                              Executor executor) {
         this.nodeIdentifier = nodeIdentifier;
@@ -108,14 +106,14 @@ public class MultiTenantRpcAuthorizer implements RpcAuthorizer {
                     return; // global config access ok
                 } else {
                     String hostname = configRequest.getClientHostName();
-                    Optional<TenantName> tenantName = Optional.ofNullable(hostRegistry.getKeyForHost(hostname));
-                    if (tenantName.isEmpty()) {
+                    ApplicationId applicationId = hostRegistry.getKeyForHost(hostname);
+                    if (applicationId == null) {
                         if (isConfigKeyForSentinelConfig(configKey)) {
                             return; // config processor will return empty sentinel config for unknown nodes
                         }
                         throw new AuthorizationException(Type.SILENT, String.format("Host '%s' not found in host registry for [%s]", hostname, configKey));
                     }
-                    RequestHandler tenantHandler = getTenantHandler(tenantName.get());
+                    RequestHandler tenantHandler = getTenantHandler(applicationId.tenant());
                     ApplicationId resolvedApplication = tenantHandler.resolveApplicationId(hostname);
                     ApplicationId peerOwner = applicationId(peerIdentity);
                     if (peerOwner.equals(resolvedApplication)) {
diff --git a/configserver/src/main/java/com/yahoo/vespa/config/server/tenant/TenantRepository.java b/configserver/src/main/java/com/yahoo/vespa/config/server/tenant/TenantRepository.java
index 5c15b72eaac..a2fa7851173 100644
--- a/configserver/src/main/java/com/yahoo/vespa/config/server/tenant/TenantRepository.java
+++ b/configserver/src/main/java/com/yahoo/vespa/config/server/tenant/TenantRepository.java
@@ -1,4 +1,4 @@
-// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
 package com.yahoo.vespa.config.server.tenant;
 
 import com.google.common.collect.ImmutableSet;
@@ -14,6 +14,7 @@ import com.yahoo.transaction.Transaction;
 import com.yahoo.vespa.config.server.GlobalComponentRegistry;
 import com.yahoo.vespa.config.server.application.TenantApplications;
 import com.yahoo.vespa.config.server.deploy.TenantFileSystemDirs;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.monitoring.MetricUpdater;
 import com.yahoo.vespa.config.server.session.SessionRepository;
 import com.yahoo.vespa.curator.Curator;
@@ -78,6 +79,7 @@ public class TenantRepository {
 
     private final Map<TenantName, Tenant> tenants = Collections.synchronizedMap(new LinkedHashMap<>());
     private final GlobalComponentRegistry componentRegistry;
+    private final HostRegistry hostRegistry;
     private final List<TenantListener> tenantListeners = Collections.synchronizedList(new ArrayList<>());
     private final Curator curator;
 
@@ -95,8 +97,9 @@ public class TenantRepository {
      * @param componentRegistry a {@link com.yahoo.vespa.config.server.GlobalComponentRegistry}
      */
     @Inject
-    public TenantRepository(GlobalComponentRegistry componentRegistry) {
+    public TenantRepository(GlobalComponentRegistry componentRegistry, HostRegistry hostRegistry) {
         this.componentRegistry = componentRegistry;
+        this.hostRegistry = hostRegistry;
         ConfigserverConfig configserverConfig = componentRegistry.getConfigserverConfig();
         this.bootstrapExecutor = Executors.newFixedThreadPool(configserverConfig.numParallelTenantLoaders(),
                                                               new DaemonThreadFactory("bootstrap tenants"));
@@ -228,7 +231,7 @@ public class TenantRepository {
                                        componentRegistry.getMetrics(),
                                        componentRegistry.getReloadListener(),
                                        componentRegistry.getConfigserverConfig(),
-                                       componentRegistry.getHostRegistries().createApplicationHostRegistry(tenantName),
+                                       hostRegistry,
                                        new TenantFileSystemDirs(componentRegistry.getConfigServerDB(), tenantName),
                                        componentRegistry.getClock());
         SessionRepository sessionRepository = new SessionRepository(tenantName,
diff --git a/configserver/src/main/resources/configserver-app/services.xml b/configserver/src/main/resources/configserver-app/services.xml
index dac10ac4e59..00c65644e47 100644
--- a/configserver/src/main/resources/configserver-app/services.xml
+++ b/configserver/src/main/resources/configserver-app/services.xml
@@ -27,7 +27,7 @@
     <component id="com.yahoo.vespa.config.server.InjectedGlobalComponentRegistry" bundle="configserver" />
     <component id="com.yahoo.vespa.config.server.tenant.TenantRepository" bundle="configserver" />
     <component id="com.yahoo.vespa.config.server.application.PermanentApplicationPackage" bundle="configserver" />
-    <component id="com.yahoo.vespa.config.server.host.HostRegistries" bundle="configserver" />
+    <component id="com.yahoo.vespa.config.server.host.HostRegistry" bundle="configserver" />
     <component id="com.yahoo.vespa.config.server.ApplicationRepository" bundle="configserver" />
     <component id="com.yahoo.vespa.config.server.version.VersionState" bundle="configserver" />
     <component id="com.yahoo.vespa.config.server.zookeeper.ConfigCurator" bundle="configserver" />
diff --git a/configserver/src/test/apps/app-jdisc-only-restart/hosts.xml b/configserver/src/test/apps/app-jdisc-only-restart/hosts.xml
index f4256c9fc81..ab70b288ba6 100644
--- a/configserver/src/test/apps/app-jdisc-only-restart/hosts.xml
+++ b/configserver/src/test/apps/app-jdisc-only-restart/hosts.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8" ?>
 <!-- Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root. -->
 <hosts>
-  <host name="mytesthost">
+  <host name="mytesthost2">
     <alias>node1</alias>
   </host>
 </hosts>
diff --git a/configserver/src/test/apps/app-jdisc-only/hosts.xml b/configserver/src/test/apps/app-jdisc-only/hosts.xml
index f4256c9fc81..ab70b288ba6 100644
--- a/configserver/src/test/apps/app-jdisc-only/hosts.xml
+++ b/configserver/src/test/apps/app-jdisc-only/hosts.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8" ?>
 <!-- Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root. -->
 <hosts>
-  <host name="mytesthost">
+  <host name="mytesthost2">
     <alias>node1</alias>
   </host>
 </hosts>
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/ApplicationRepositoryTest.java b/configserver/src/test/java/com/yahoo/vespa/config/server/ApplicationRepositoryTest.java
index 0cab49a9f00..b45569c95b8 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/ApplicationRepositoryTest.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/ApplicationRepositoryTest.java
@@ -32,6 +32,7 @@ import com.yahoo.vespa.config.protocol.VespaVersion;
 import com.yahoo.vespa.config.server.application.OrchestratorMock;
 import com.yahoo.vespa.config.server.deploy.DeployTester;
 import com.yahoo.vespa.config.server.deploy.TenantFileSystemDirs;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.http.v2.PrepareResult;
 import com.yahoo.vespa.config.server.session.LocalSession;
 import com.yahoo.vespa.config.server.session.PrepareParams;
@@ -127,7 +128,7 @@ public class ApplicationRepositoryTest {
                 .flagSource(flagSource)
                 .clock(clock)
                 .build();
-        tenantRepository = new TenantRepository(componentRegistry);
+        tenantRepository = new TenantRepository(componentRegistry, new HostRegistry());
         tenantRepository.addTenant(TenantRepository.HOSTED_VESPA_TENANT);
         tenantRepository.addTenant(tenant1);
         tenantRepository.addTenant(tenant2);
@@ -192,7 +193,7 @@ public class ApplicationRepositoryTest {
         PrepareResult result = prepareAndActivate(testAppJdiscOnlyRestart);
         assertTrue(result.configChangeActions().getRefeedActions().isEmpty());
         assertTrue(result.configChangeActions().getRestartActions().isEmpty());
-        assertEquals(HostFilter.hostname("mytesthost"), provisioner.lastRestartFilter());
+        assertEquals(HostFilter.hostname("mytesthost2"), provisioner.lastRestartFilter());
     }
 
     @Test
@@ -345,7 +346,7 @@ public class ApplicationRepositoryTest {
             // Deploy another app (with id fooId)
             ApplicationId fooId = applicationId(tenant2);
             PrepareParams prepareParams2 = new PrepareParams.Builder().applicationId(fooId).build();
-            deployApp(testApp, prepareParams2);
+            deployApp(testAppJdiscOnly, prepareParams2);
             assertNotNull(applicationRepository.getActiveSession(fooId));
 
             // Delete app with id fooId, should not affect original app
@@ -530,14 +531,14 @@ public class ApplicationRepositoryTest {
         list.add(new NetworkPorts.Allocation(19081, "logserver", "admin/logserver", "unused/1"));
         list.add(new NetworkPorts.Allocation(19082, "logserver", "admin/logserver", "unused/2"));
         list.add(new NetworkPorts.Allocation(19083, "logserver", "admin/logserver", "unused/3"));
-        list.add(new NetworkPorts.Allocation(19089, "logd", "hosts/mytesthost/logd", "http"));
-        list.add(new NetworkPorts.Allocation(19090, "configproxy", "hosts/mytesthost/configproxy", "rpc"));
-        list.add(new NetworkPorts.Allocation(19092, "metricsproxy-container", "admin/metrics/mytesthost", "http"));
-        list.add(new NetworkPorts.Allocation(19093, "metricsproxy-container", "admin/metrics/mytesthost", "http/1"));
-        list.add(new NetworkPorts.Allocation(19094, "metricsproxy-container", "admin/metrics/mytesthost", "rpc/admin"));
-        list.add(new NetworkPorts.Allocation(19095, "metricsproxy-container", "admin/metrics/mytesthost", "rpc/metrics"));
-        list.add(new NetworkPorts.Allocation(19097, "config-sentinel", "hosts/mytesthost/sentinel", "rpc"));
-        list.add(new NetworkPorts.Allocation(19098, "config-sentinel", "hosts/mytesthost/sentinel", "http"));
+        list.add(new NetworkPorts.Allocation(19089, "logd", "hosts/mytesthost2/logd", "http"));
+        list.add(new NetworkPorts.Allocation(19090, "configproxy", "hosts/mytesthost2/configproxy", "rpc"));
+        list.add(new NetworkPorts.Allocation(19092, "metricsproxy-container", "admin/metrics/mytesthost2", "http"));
+        list.add(new NetworkPorts.Allocation(19093, "metricsproxy-container", "admin/metrics/mytesthost2", "http/1"));
+        list.add(new NetworkPorts.Allocation(19094, "metricsproxy-container", "admin/metrics/mytesthost2", "rpc/admin"));
+        list.add(new NetworkPorts.Allocation(19095, "metricsproxy-container", "admin/metrics/mytesthost2", "rpc/metrics"));
+        list.add(new NetworkPorts.Allocation(19097, "config-sentinel", "hosts/mytesthost2/sentinel", "rpc"));
+        list.add(new NetworkPorts.Allocation(19098, "config-sentinel", "hosts/mytesthost2/sentinel", "http"));
         list.add(new NetworkPorts.Allocation(19099, "slobrok", "admin/slobrok.0", "rpc"));
         list.add(new NetworkPorts.Allocation(19100, "container", "container/container.0", "http/1"));
         list.add(new NetworkPorts.Allocation(19101, "container", "container/container.0", "messaging"));
@@ -547,7 +548,7 @@ public class ApplicationRepositoryTest {
         AllocatedHosts info = session.getAllocatedHosts();
         assertNotNull(info);
         assertThat(info.getHosts().size(), is(1));
-        assertTrue(info.getHosts().contains(new HostSpec("mytesthost",
+        assertTrue(info.getHosts().contains(new HostSpec("mytesthost2",
                                                          Collections.emptyList(),
                                                          Optional.empty())));
         Optional<NetworkPorts> portsCopy = info.getHosts().iterator().next().networkPorts();
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/InjectedGlobalComponentRegistryTest.java b/configserver/src/test/java/com/yahoo/vespa/config/server/InjectedGlobalComponentRegistryTest.java
index bf54c2b309e..4f6642610dd 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/InjectedGlobalComponentRegistryTest.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/InjectedGlobalComponentRegistryTest.java
@@ -8,12 +8,12 @@ import com.yahoo.config.provision.Zone;
 import com.yahoo.vespa.config.server.application.PermanentApplicationPackage;
 import com.yahoo.vespa.config.server.filedistribution.FileServer;
 import com.yahoo.vespa.config.server.host.ConfigRequestHostLivenessTracker;
-import com.yahoo.vespa.config.server.host.HostRegistries;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.modelfactory.ModelFactoryRegistry;
 import com.yahoo.vespa.config.server.monitoring.Metrics;
 import com.yahoo.vespa.config.server.provision.HostProvisionerProvider;
-import com.yahoo.vespa.config.server.rpc.RpcServer;
 import com.yahoo.vespa.config.server.rpc.RpcRequestHandlerProvider;
+import com.yahoo.vespa.config.server.rpc.RpcServer;
 import com.yahoo.vespa.config.server.rpc.security.NoopRpcAuthorizer;
 import com.yahoo.vespa.config.server.session.SessionPreparer;
 import com.yahoo.vespa.config.server.session.SessionTest;
@@ -46,7 +46,6 @@ public class InjectedGlobalComponentRegistryTest {
     private RpcServer rpcServer;
     private ConfigDefinitionRepo defRepo;
     private PermanentApplicationPackage permanentApplicationPackage;
-    private HostRegistries hostRegistries;
     private GlobalComponentRegistry globalComponentRegistry;
     private ModelFactoryRegistry modelFactoryRegistry;
     private Zone zone;
@@ -65,20 +64,21 @@ public class InjectedGlobalComponentRegistryTest {
                         .configServerDBDir(temporaryFolder.newFolder("serverdb").getAbsolutePath())
                         .configDefinitionsDir(temporaryFolder.newFolder("configdefinitions").getAbsolutePath()));
         sessionPreparer = new SessionTest.MockSessionPreparer();
+        HostRegistry hostRegistry = new HostRegistry();
         rpcServer = new RpcServer(configserverConfig, null, Metrics.createTestMetrics(),
-                                  new HostRegistries(), new ConfigRequestHostLivenessTracker(),
+                                  hostRegistry, new ConfigRequestHostLivenessTracker(),
                                   new FileServer(temporaryFolder.newFolder("filereferences")),
                                   new NoopRpcAuthorizer(), new RpcRequestHandlerProvider());
-        SuperModelGenerationCounter generationCounter = new SuperModelGenerationCounter(curator);
         defRepo = new StaticConfigDefinitionRepo();
         permanentApplicationPackage = new PermanentApplicationPackage(configserverConfig);
-        hostRegistries = new HostRegistries();
         HostProvisionerProvider hostProvisionerProvider = HostProvisionerProvider.withProvisioner(new MockProvisioner());
         zone = Zone.defaultZone();
         globalComponentRegistry =
-                new InjectedGlobalComponentRegistry(curator, configCurator, metrics, modelFactoryRegistry, sessionPreparer, rpcServer, configserverConfig,
-                                                    generationCounter, defRepo, permanentApplicationPackage, hostRegistries, hostProvisionerProvider, zone,
-                                                    new ConfigServerDB(configserverConfig), new InMemoryFlagSource(), new MockSecretStore());
+                new InjectedGlobalComponentRegistry(curator, configCurator, metrics, modelFactoryRegistry, sessionPreparer,
+                                                    rpcServer, configserverConfig, defRepo, permanentApplicationPackage,
+                                                    hostProvisionerProvider, zone,
+                                                    new ConfigServerDB(configserverConfig), new InMemoryFlagSource(),
+                                                    new MockSecretStore(), hostRegistry);
     }
 
     @Test
@@ -92,7 +92,6 @@ public class InjectedGlobalComponentRegistryTest {
         assertThat(globalComponentRegistry.getTenantListener().hashCode(), is(rpcServer.hashCode()));
         assertThat(globalComponentRegistry.getStaticConfigDefinitionRepo(), is(defRepo));
         assertThat(globalComponentRegistry.getPermanentApplicationPackage(), is(permanentApplicationPackage));
-        assertThat(globalComponentRegistry.getHostRegistries(), is(hostRegistries));
         assertThat(globalComponentRegistry.getZone(), is (zone));
         assertTrue(globalComponentRegistry.getHostProvisioner().isPresent());
     }
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/SuperModelControllerTest.java b/configserver/src/test/java/com/yahoo/vespa/config/server/SuperModelControllerTest.java
index 965374f2aa4..c58bd6d6b0a 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/SuperModelControllerTest.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/SuperModelControllerTest.java
@@ -83,34 +83,6 @@ public class SuperModelControllerTest {
     }
 
     @Test
-    public void test_lb_config_multiple_apps_legacy_super_model() throws IOException, SAXException {
-        Map<ApplicationId, ApplicationInfo> models = new LinkedHashMap<>();
-        TenantName t1 = TenantName.from("t1");
-        TenantName t2 = TenantName.from("t2");
-        File testApp1 = new File("src/test/resources/deploy/app");
-        File testApp2 = new File("src/test/resources/deploy/advancedapp");
-        File testApp3 = new File("src/test/resources/deploy/advancedapp");
-
-        ApplicationId simple = applicationId("mysimpleapp", t1);
-        ApplicationId advanced = applicationId("myadvancedapp", t1);
-        ApplicationId tooAdvanced = applicationId("minetooadvancedapp", t2);
-        models.put(simple, createApplicationInfo(testApp1, simple, 4L));
-        models.put(advanced, createApplicationInfo(testApp2, advanced, 4L));
-        models.put(tooAdvanced, createApplicationInfo(testApp3, tooAdvanced, 4L));
-
-        SuperModel superModel = new SuperModel(models, true);
-        SuperModelController han = new SuperModelController(new SuperModelConfigProvider(superModel, Zone.defaultZone(), new InMemoryFlagSource()), new TestConfigDefinitionRepo(), 2, new UncompressedConfigResponseFactory());
-        LbServicesConfig.Builder lb = new LbServicesConfig.Builder();
-        han.getSuperModel().getConfig(lb);
-        LbServicesConfig lbc = new LbServicesConfig(lb);
-        assertThat(lbc.tenants().size(), is(2));
-        assertThat(lbc.tenants("t1").applications().size(), is(2));
-        assertThat(lbc.tenants("t2").applications().size(), is(1));
-        assertThat(lbc.tenants("t2").applications("minetooadvancedapp:prod:default:default").hosts().size(), is(1));
-        assertQrServer(lbc.tenants("t2").applications("minetooadvancedapp:prod:default:default"));
-    }
-
-    @Test
     public void test_lb_config_multiple_apps() throws IOException, SAXException {
         Map<ApplicationId, ApplicationInfo> models = new LinkedHashMap<>();
         TenantName t1 = TenantName.from("t1");
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/TestComponentRegistry.java b/configserver/src/test/java/com/yahoo/vespa/config/server/TestComponentRegistry.java
index e6652c3c5e1..0221cf9abfc 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/TestComponentRegistry.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/TestComponentRegistry.java
@@ -1,4 +1,4 @@
-// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
 package com.yahoo.vespa.config.server;
 
 import com.yahoo.cloud.config.ConfigserverConfig;
@@ -12,12 +12,12 @@ import com.yahoo.config.provision.Zone;
 import com.yahoo.container.jdisc.secretstore.SecretStore;
 import com.yahoo.vespa.config.server.application.PermanentApplicationPackage;
 import com.yahoo.vespa.config.server.application.TenantApplicationsTest;
-import com.yahoo.vespa.config.server.host.HostRegistries;
+import com.yahoo.vespa.config.server.filedistribution.FileDistributionFactory;
+import com.yahoo.vespa.config.server.filedistribution.MockFileDistributionFactory;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.modelfactory.ModelFactoryRegistry;
 import com.yahoo.vespa.config.server.monitoring.Metrics;
 import com.yahoo.vespa.config.server.provision.HostProvisionerProvider;
-import com.yahoo.vespa.config.server.filedistribution.FileDistributionFactory;
-import com.yahoo.vespa.config.server.filedistribution.MockFileDistributionFactory;
 import com.yahoo.vespa.config.server.session.SessionPreparer;
 import com.yahoo.vespa.config.server.tenant.MockTenantListener;
 import com.yahoo.vespa.config.server.tenant.TenantListener;
@@ -50,7 +50,6 @@ public class TestComponentRegistry implements GlobalComponentRegistry {
     private final ReloadListener reloadListener;
     private final TenantListener tenantListener;
     private final PermanentApplicationPackage permanentApplicationPackage;
-    private final HostRegistries hostRegistries;
     private final FileDistributionFactory fileDistributionFactory;
     private final ModelFactoryRegistry modelFactoryRegistry;
     private final Optional<Provisioner> hostProvisioner;
@@ -66,7 +65,6 @@ public class TestComponentRegistry implements GlobalComponentRegistry {
                                   ModelFactoryRegistry modelFactoryRegistry,
                                   PermanentApplicationPackage permanentApplicationPackage,
                                   FileDistributionFactory fileDistributionFactory,
-                                  HostRegistries hostRegistries,
                                   ConfigserverConfig configserverConfig,
                                   SessionPreparer sessionPreparer,
                                   Optional<Provisioner> hostProvisioner,
@@ -85,7 +83,6 @@ public class TestComponentRegistry implements GlobalComponentRegistry {
         this.tenantListener = tenantListener;
         this.defRepo = defRepo;
         this.permanentApplicationPackage = permanentApplicationPackage;
-        this.hostRegistries = hostRegistries;
         this.fileDistributionFactory = fileDistributionFactory;
         this.modelFactoryRegistry = modelFactoryRegistry;
         this.hostProvisioner = hostProvisioner;
@@ -112,7 +109,6 @@ public class TestComponentRegistry implements GlobalComponentRegistry {
         private ReloadListener reloadListener = new TenantApplicationsTest.MockReloadListener();
         private final MockTenantListener tenantListener = new MockTenantListener();
         private Optional<PermanentApplicationPackage> permanentApplicationPackage = Optional.empty();
-        private final HostRegistries hostRegistries = new HostRegistries();
         private final Optional<FileDistributionFactory> fileDistributionFactory = Optional.empty();
         private ModelFactoryRegistry modelFactoryRegistry = new ModelFactoryRegistry(Collections.singletonList(new VespaModelFactory(new NullConfigModelRegistry())));
         private Optional<Provisioner> hostProvisioner = Optional.empty();
@@ -188,7 +184,7 @@ public class TestComponentRegistry implements GlobalComponentRegistry {
                                                                   configserverConfig, defRepo, curator,
                                                                   zone, flagSource, secretStore);
             return new TestComponentRegistry(curator, ConfigCurator.create(curator), metrics, modelFactoryRegistry,
-                                             permApp, fileDistributionProvider, hostRegistries, configserverConfig,
+                                             permApp, fileDistributionProvider, configserverConfig,
                                              sessionPreparer, hostProvisioner, defRepo, reloadListener, tenantListener,
                                              zone, clock, secretStore, flagSource);
         }
@@ -213,8 +209,6 @@ public class TestComponentRegistry implements GlobalComponentRegistry {
     @Override
     public PermanentApplicationPackage getPermanentApplicationPackage() { return permanentApplicationPackage; }
     @Override
-    public HostRegistries getHostRegistries() { return hostRegistries;}
-    @Override
     public ModelFactoryRegistry getModelFactoryRegistry() { return modelFactoryRegistry; }
     @Override
     public Optional<Provisioner> getHostProvisioner() {
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/application/TenantApplicationsTest.java b/configserver/src/test/java/com/yahoo/vespa/config/server/application/TenantApplicationsTest.java
index 947308962d4..4543d3b5673 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/application/TenantApplicationsTest.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/application/TenantApplicationsTest.java
@@ -12,6 +12,7 @@ import com.yahoo.vespa.config.ConfigKey;
 import com.yahoo.vespa.config.server.ReloadListener;
 import com.yahoo.vespa.config.server.ServerCache;
 import com.yahoo.vespa.config.server.TestComponentRegistry;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.model.TestModelFactory;
 import com.yahoo.vespa.config.server.modelfactory.ModelFactoryRegistry;
 import com.yahoo.vespa.config.server.monitoring.MetricUpdater;
@@ -75,10 +76,11 @@ public class TenantApplicationsTest {
                 .modelFactoryRegistry(createRegistry())
                 .reloadListener(listener)
                 .build();
-        TenantRepository tenantRepository = new TenantRepository(componentRegistry);
+        HostRegistry hostRegistry = new HostRegistry();
+        TenantRepository tenantRepository = new TenantRepository(componentRegistry, hostRegistry);
         tenantRepository.addTenant(TenantRepository.HOSTED_VESPA_TENANT);
         tenantRepository.addTenant(tenantName);
-        applications = TenantApplications.create(componentRegistry, tenantName);
+        applications = TenantApplications.create(componentRegistry, hostRegistry, tenantName);
     }
 
     @Test
@@ -151,12 +153,12 @@ public class TenantApplicationsTest {
         }
 
         @Override
-        public void hostsUpdated(TenantName tenant, Collection<String> newHosts) {
-            tenantHosts.put(tenant.value(), newHosts);
+        public void hostsUpdated(ApplicationId applicationId, Collection<String> newHosts) {
+            tenantHosts.put(applicationId.tenant().value(), newHosts);
         }
 
         @Override
-        public void verifyHostsAreAvailable(TenantName tenant, Collection<String> newHosts) {
+        public void verifyHostsAreAvailable(ApplicationId applicationId, Collection<String> newHosts) {
         }
 
         @Override
@@ -171,7 +173,7 @@ public class TenantApplicationsTest {
 
     @Test
     public void testListConfigs() throws IOException, SAXException {
-        applications = TenantApplications.create(componentRegistry, TenantName.defaultName());
+        applications = TenantApplications.create(componentRegistry, new HostRegistry(), TenantName.defaultName());
         assertdefaultAppNotFound();
 
         VespaModel model = new VespaModel(FilesApplicationPackage.fromFile(new File("src/test/apps/app")));
@@ -206,7 +208,7 @@ public class TenantApplicationsTest {
     }
 
     private TenantApplications createZKAppRepo() {
-        return TenantApplications.create(componentRegistry, tenantName);
+        return TenantApplications.create(componentRegistry, new HostRegistry(), tenantName);
     }
 
     private static ApplicationId createApplicationId(String name) {
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/deploy/DeployTester.java b/configserver/src/test/java/com/yahoo/vespa/config/server/deploy/DeployTester.java
index 5b5f830c737..54d23652349 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/deploy/DeployTester.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/deploy/DeployTester.java
@@ -26,6 +26,7 @@ import com.yahoo.vespa.config.server.MockProvisioner;
 import com.yahoo.vespa.config.server.TestComponentRegistry;
 import com.yahoo.vespa.config.server.TimeoutBudget;
 import com.yahoo.vespa.config.server.application.OrchestratorMock;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.http.v2.PrepareResult;
 import com.yahoo.vespa.config.server.modelfactory.ModelFactoryRegistry;
 import com.yahoo.vespa.config.server.monitoring.Metrics;
@@ -289,7 +290,7 @@ public class DeployTester {
                     .zone(zone);
             if (configserverConfig.hostedVespa()) testComponentRegistryBuilder.provisioner(provisioner);
 
-            TenantRepository tenantRepository = new TenantRepository(testComponentRegistryBuilder.build());
+            TenantRepository tenantRepository = new TenantRepository(testComponentRegistryBuilder.build(), new HostRegistry());
             tenantRepository.addTenant(tenantName);
 
             ApplicationRepository applicationRepository = new ApplicationRepository.Builder()
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/host/HostRegistryTest.java b/configserver/src/test/java/com/yahoo/vespa/config/server/host/HostRegistryTest.java
index 63dfb1d01bd..173e9f3e148 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/host/HostRegistryTest.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/host/HostRegistryTest.java
@@ -1,37 +1,44 @@
 // Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
 package com.yahoo.vespa.config.server.host;
 
+import com.yahoo.config.provision.ApplicationId;
+import org.junit.Test;
+
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 
-import org.junit.Test;
-
 import static org.hamcrest.collection.IsIterableContainingInOrder.contains;
 import static org.hamcrest.core.Is.is;
-import static org.junit.Assert.*;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertThat;
 
 /**
  * @author Ulf Lilleengen
  */
 public class HostRegistryTest {
+
+    private final ApplicationId foo = ApplicationId.from("foo", "app1", "default");
+    private final ApplicationId bar = ApplicationId.from("bar", "app2", "default");
+
     @Test
     public void old_hosts_are_removed() {
-        HostRegistry<String> reg = new HostRegistry<>();
+        HostRegistry reg = new HostRegistry();
         assertNull(reg.getKeyForHost("foo.com"));
-        reg.update("fookey", List.of("foo.com", "bar.com", "baz.com"));
-        assertGetKey(reg, "foo.com", "fookey");
-        assertGetKey(reg, "bar.com", "fookey");
-        assertGetKey(reg, "baz.com", "fookey");
+        reg.update(foo, List.of("foo.com", "bar.com", "baz.com"));
+        assertGetKey(reg, "foo.com", foo);
+        assertGetKey(reg, "bar.com", foo);
+        assertGetKey(reg, "baz.com", foo);
         assertThat(reg.getAllHosts().size(), is(3));
-        reg.update("fookey", List.of("bar.com", "baz.com"));
+        reg.update(foo, List.of("bar.com", "baz.com"));
         assertNull(reg.getKeyForHost("foo.com"));
-        assertGetKey(reg, "bar.com", "fookey");
-        assertGetKey(reg, "baz.com", "fookey");
+        assertGetKey(reg, "bar.com", foo);
+        assertGetKey(reg, "baz.com", foo);
 
         assertThat(reg.getAllHosts().size(), is(2));
         assertThat(reg.getAllHosts(), contains("bar.com", "baz.com"));
-        reg.removeHostsForKey("fookey");
+        reg.removeHostsForKey(foo);
         assertThat(reg.getAllHosts().size(), is(0));
         assertNull(reg.getKeyForHost("foo.com"));
         assertNull(reg.getKeyForHost("bar.com"));
@@ -39,51 +46,51 @@ public class HostRegistryTest {
 
     @Test
     public void multiple_keys_are_handled() {
-        HostRegistry<String> reg = new HostRegistry<>();
-        reg.update("fookey", List.of("foo.com", "bar.com"));
-        reg.update("barkey", List.of("baz.com", "quux.com"));
-        assertGetKey(reg, "foo.com", "fookey");
-        assertGetKey(reg, "bar.com", "fookey");
-        assertGetKey(reg, "baz.com", "barkey");
-        assertGetKey(reg, "quux.com", "barkey");
+        HostRegistry reg = new HostRegistry();
+        reg.update(foo, List.of("foo.com", "bar.com"));
+        reg.update(bar, List.of("baz.com", "quux.com"));
+        assertGetKey(reg, "foo.com", foo);
+        assertGetKey(reg, "bar.com", foo);
+        assertGetKey(reg, "baz.com", bar);
+        assertGetKey(reg, "quux.com", bar);
     }
 
     @Test(expected = IllegalArgumentException.class)
     public void keys_cannot_overlap() {
-        HostRegistry<String> reg = new HostRegistry<>();
-        reg.update("fookey", List.of("foo.com", "bar.com"));
-        reg.update("barkey", List.of("bar.com", "baz.com"));
+        HostRegistry reg = new HostRegistry();
+        reg.update(foo, List.of("foo.com", "bar.com"));
+        reg.update(bar, List.of("bar.com", "baz.com"));
     }
 
     @Test
     public void all_hosts_are_returned() {
-        HostRegistry<String> reg = new HostRegistry<>();
-        reg.update("fookey", List.of("foo.com", "bar.com"));
-        reg.update("barkey", List.of("baz.com", "quux.com"));
+        HostRegistry reg = new HostRegistry();
+        reg.update(foo, List.of("foo.com", "bar.com"));
+        reg.update(bar, List.of("baz.com", "quux.com"));
         assertThat(reg.getAllHosts().size(), is(4));
     }
 
     @Test
     public void ensure_that_collection_is_copied() {
-        HostRegistry<String> reg = new HostRegistry<>();
+        HostRegistry reg = new HostRegistry();
         List<String> hosts = new ArrayList<>(List.of("foo.com", "bar.com", "baz.com"));
-        reg.update("fookey", hosts);
-        assertThat(reg.getHostsForKey("fookey").size(), is(3));
+        reg.update(foo, hosts);
+        assertThat(reg.getHostsForKey(foo).size(), is(3));
         hosts.remove(2);
-        assertThat(reg.getHostsForKey("fookey").size(), is(3));
+        assertThat(reg.getHostsForKey(foo).size(), is(3));
     }
 
     @Test
     public void ensure_that_underlying_hosts_do_not_change() {
-        HostRegistry<String> reg = new HostRegistry<>();
-        reg.update("fookey", List.of("foo.com", "bar.com", "baz.com"));
+        HostRegistry reg = new HostRegistry();
+        reg.update(foo, List.of("foo.com", "bar.com", "baz.com"));
         Collection<String> hosts = reg.getAllHosts();
         assertThat(hosts.size(), is(3));
-        reg.update("fookey", List.of("foo.com"));
+        reg.update(foo, List.of("foo.com"));
         assertThat(hosts.size(), is(3));
     }
 
-    private void assertGetKey(HostRegistry<String> reg, String host, String expectedKey) {
+    private void assertGetKey(HostRegistry reg, String host, ApplicationId expectedKey) {
         assertNotNull(reg.getKeyForHost(host));
         assertThat(reg.getKeyForHost(host), is(expectedKey));
     }
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/http/HttpGetConfigHandlerTest.java b/configserver/src/test/java/com/yahoo/vespa/config/server/http/HttpGetConfigHandlerTest.java
index 9b6ced7f0f6..6c5e25d0503 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/http/HttpGetConfigHandlerTest.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/http/HttpGetConfigHandlerTest.java
@@ -11,6 +11,7 @@ import com.yahoo.vespa.config.server.MockProvisioner;
 import com.yahoo.vespa.config.server.TestComponentRegistry;
 import com.yahoo.vespa.config.server.TestConfigDefinitionRepo;
 import com.yahoo.vespa.config.server.application.OrchestratorMock;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.session.PrepareParams;
 import com.yahoo.vespa.config.server.tenant.TenantRepository;
 import org.junit.Before;
@@ -58,7 +59,7 @@ public class HttpGetConfigHandlerTest {
                 .configDefinitionRepo(new TestConfigDefinitionRepo())
                 .configServerConfig(configserverConfig)
                 .build();
-        TenantRepository tenantRepository = new TenantRepository(componentRegistry);
+        TenantRepository tenantRepository = new TenantRepository(componentRegistry, new HostRegistry());
         tenantRepository.addTenant(tenant);
         ApplicationRepository applicationRepository = new ApplicationRepository.Builder()
                 .withTenantRepository(tenantRepository)
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/http/HttpListConfigsHandlerTest.java b/configserver/src/test/java/com/yahoo/vespa/config/server/http/HttpListConfigsHandlerTest.java
index 203b70c2f85..b55b250fc1c 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/http/HttpListConfigsHandlerTest.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/http/HttpListConfigsHandlerTest.java
@@ -12,6 +12,7 @@ import com.yahoo.vespa.config.server.MockProvisioner;
 import com.yahoo.vespa.config.server.TestComponentRegistry;
 import com.yahoo.vespa.config.server.TestConfigDefinitionRepo;
 import com.yahoo.vespa.config.server.application.OrchestratorMock;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.http.HttpListConfigsHandler.ListConfigsResponse;
 import com.yahoo.vespa.config.server.session.PrepareParams;
 import com.yahoo.vespa.config.server.tenant.TenantRepository;
@@ -63,7 +64,7 @@ public class HttpListConfigsHandlerTest {
                 .configDefinitionRepo(new TestConfigDefinitionRepo())
                 .configServerConfig(configserverConfig)
                 .build();
-        TenantRepository tenantRepository = new TenantRepository(componentRegistry);
+        TenantRepository tenantRepository = new TenantRepository(componentRegistry, new HostRegistry());
         tenantRepository.addTenant(tenant);
         ApplicationRepository applicationRepository = new ApplicationRepository.Builder()
                 .withTenantRepository(tenantRepository)
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/ApplicationContentHandlerTest.java b/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/ApplicationContentHandlerTest.java
index 126dfe88141..06bac6497a2 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/ApplicationContentHandlerTest.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/ApplicationContentHandlerTest.java
@@ -12,6 +12,7 @@ import com.yahoo.vespa.config.server.ApplicationRepository;
 import com.yahoo.vespa.config.server.MockProvisioner;
 import com.yahoo.vespa.config.server.TestComponentRegistry;
 import com.yahoo.vespa.config.server.application.OrchestratorMock;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.http.ContentHandlerTestBase;
 import com.yahoo.vespa.config.server.session.PrepareParams;
 import com.yahoo.vespa.config.server.session.Session;
@@ -36,14 +37,12 @@ import static org.junit.Assert.assertThat;
 public class ApplicationContentHandlerTest extends ContentHandlerTestBase {
 
     private static final File testApp = new File("src/test/apps/content");
-    private static final File testApp2 = new File("src/test/apps/content2");
 
     private final TenantName tenantName1 = TenantName.from("mofet");
     private final TenantName tenantName2 = TenantName.from("bla");
     private final String baseServer = "http://foo:1337";
 
     private final ApplicationId appId1 = new ApplicationId.Builder().tenant(tenantName1).applicationName("foo").instanceName("quux").build();
-    private final ApplicationId appId2 = new ApplicationId.Builder().tenant(tenantName2).applicationName("foo").instanceName("quux").build();
 
     private ApplicationRepository applicationRepository;
     private ApplicationHandler handler;
@@ -64,7 +63,7 @@ public class ApplicationContentHandlerTest extends ContentHandlerTestBase {
                 .build();
         Clock clock = componentRegistry.getClock();
 
-        TenantRepository tenantRepository = new TenantRepository(componentRegistry);
+        TenantRepository tenantRepository = new TenantRepository(componentRegistry, new HostRegistry());
         tenantRepository.addTenant(tenantName1);
         tenantRepository.addTenant(tenantName2);
 
@@ -77,8 +76,6 @@ public class ApplicationContentHandlerTest extends ContentHandlerTestBase {
                 .build();
 
         applicationRepository.deploy(testApp, prepareParams(appId1));
-        applicationRepository.deploy(testApp2, prepareParams(appId2));
-
         handler = new ApplicationHandler(ApplicationHandler.testOnlyContext(),
                                          Zone.defaultZone(),
                                          applicationRepository);
@@ -113,14 +110,6 @@ public class ApplicationContentHandlerTest extends ContentHandlerTestBase {
     }
 
     @Test
-    public void require_that_multiple_tenants_are_handled() throws IOException {
-        assertContent("/test.txt", "foo\n");
-        pathPrefix = createPath(appId2, Zone.defaultZone());
-        baseUrl = baseServer + pathPrefix;
-        assertContent("/test.txt", "bar\n");
-    }
-
-    @Test
     public void require_that_get_does_not_set_write_flag() throws IOException {
         Tenant tenant1 = applicationRepository.getTenant(appId1);
         Session session = applicationRepository.getActiveLocalSession(tenant1, appId1);
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/ApplicationHandlerTest.java b/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/ApplicationHandlerTest.java
index a0c63c8bba1..f9b33791a36 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/ApplicationHandlerTest.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/ApplicationHandlerTest.java
@@ -26,6 +26,7 @@ import com.yahoo.vespa.config.server.application.ClusterReindexing.Status;
 import com.yahoo.vespa.config.server.application.HttpProxy;
 import com.yahoo.vespa.config.server.application.OrchestratorMock;
 import com.yahoo.vespa.config.server.deploy.DeployTester;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.http.HandlerTest;
 import com.yahoo.vespa.config.server.http.HttpErrorResponse;
 import com.yahoo.vespa.config.server.http.SessionHandlerTest;
@@ -76,6 +77,7 @@ import static org.mockito.Mockito.when;
 public class ApplicationHandlerTest {
 
     private static final File testApp = new File("src/test/apps/app");
+    private static final File testAppJdiscOnly = new File("src/test/apps/app-jdisc-only");
 
     private final static TenantName mytenantName = TenantName.from("mytenant");
     private final static ApplicationId myTenantApplicationId = ApplicationId.from(mytenantName, ApplicationName.defaultName(), InstanceName.defaultName());
@@ -108,7 +110,7 @@ public class ApplicationHandlerTest {
                 .configServerConfig(configserverConfig)
                 .clock(clock)
                 .build();
-        tenantRepository = new TenantRepository(componentRegistry);
+        tenantRepository = new TenantRepository(componentRegistry, new HostRegistry());
         tenantRepository.addTenant(mytenantName);
         provisioner = new MockProvisioner();
         orchestrator = new OrchestratorMock();
@@ -150,7 +152,7 @@ public class ApplicationHandlerTest {
                     .instanceName("quux")
                     .build();
             PrepareParams prepareParams2 = new PrepareParams.Builder().applicationId(fooId).build();
-            applicationRepository.deploy(testApp, prepareParams2);
+            applicationRepository.deploy(testAppJdiscOnly, prepareParams2);
 
             assertApplicationExists(fooId, Zone.defaultZone());
             deleteAndAssertOKResponseMocked(fooId, true);
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/HostHandlerTest.java b/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/HostHandlerTest.java
index 0b5c5d3d4da..6ef1a0b63cd 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/HostHandlerTest.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/HostHandlerTest.java
@@ -14,6 +14,7 @@ import com.yahoo.vespa.config.server.ApplicationRepository;
 import com.yahoo.vespa.config.server.MockProvisioner;
 import com.yahoo.vespa.config.server.TestComponentRegistry;
 import com.yahoo.vespa.config.server.application.OrchestratorMock;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.http.HandlerTest;
 import com.yahoo.vespa.config.server.http.HttpErrorResponse;
 import com.yahoo.vespa.config.server.session.PrepareParams;
@@ -56,7 +57,7 @@ public class HostHandlerTest {
                 .zone(zone)
                 .configServerConfig(configserverConfig)
                 .build();
-        TenantRepository tenantRepository = new TenantRepository(componentRegistry);
+        TenantRepository tenantRepository = new TenantRepository(componentRegistry, new HostRegistry());
         tenantRepository.addTenant(mytenant);
         applicationRepository = new ApplicationRepository.Builder()
                 .withTenantRepository(tenantRepository)
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/HttpGetConfigHandlerTest.java b/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/HttpGetConfigHandlerTest.java
index f3703c5397d..68cd474412f 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/HttpGetConfigHandlerTest.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/HttpGetConfigHandlerTest.java
@@ -13,6 +13,7 @@ import com.yahoo.vespa.config.server.MockProvisioner;
 import com.yahoo.vespa.config.server.TestComponentRegistry;
 import com.yahoo.vespa.config.server.TestConfigDefinitionRepo;
 import com.yahoo.vespa.config.server.application.OrchestratorMock;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.http.HandlerTest;
 import com.yahoo.vespa.config.server.http.HttpConfigRequest;
 import com.yahoo.vespa.config.server.http.HttpErrorResponse;
@@ -66,7 +67,7 @@ public class HttpGetConfigHandlerTest {
                 .configDefinitionRepo(new TestConfigDefinitionRepo())
                 .configServerConfig(configserverConfig)
                 .build();
-        TenantRepository tenantRepository = new TenantRepository(componentRegistry);
+        TenantRepository tenantRepository = new TenantRepository(componentRegistry, new HostRegistry());
         tenantRepository.addTenant(tenant);
         ApplicationRepository applicationRepository = new ApplicationRepository.Builder()
                 .withTenantRepository(tenantRepository)
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/HttpListConfigsHandlerTest.java b/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/HttpListConfigsHandlerTest.java
index c1c9874c35c..985a88ceed2 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/HttpListConfigsHandlerTest.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/HttpListConfigsHandlerTest.java
@@ -15,6 +15,7 @@ import com.yahoo.vespa.config.server.MockProvisioner;
 import com.yahoo.vespa.config.server.TestComponentRegistry;
 import com.yahoo.vespa.config.server.TestConfigDefinitionRepo;
 import com.yahoo.vespa.config.server.application.OrchestratorMock;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.http.HandlerTest;
 import com.yahoo.vespa.config.server.http.HttpErrorResponse;
 import com.yahoo.vespa.config.server.http.v2.HttpListConfigsHandler.ListConfigsResponse;
@@ -70,7 +71,7 @@ public class HttpListConfigsHandlerTest {
                 .configDefinitionRepo(new TestConfigDefinitionRepo())
                 .configServerConfig(configserverConfig)
                 .build();
-        TenantRepository tenantRepository = new TenantRepository(componentRegistry);
+        TenantRepository tenantRepository = new TenantRepository(componentRegistry, new HostRegistry());
         tenantRepository.addTenant(tenant);
         ApplicationRepository applicationRepository = new ApplicationRepository.Builder()
                 .withTenantRepository(tenantRepository)
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/ListApplicationsHandlerTest.java b/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/ListApplicationsHandlerTest.java
index 80a0b9edba6..232243c2b74 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/ListApplicationsHandlerTest.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/ListApplicationsHandlerTest.java
@@ -12,6 +12,7 @@ import com.yahoo.jdisc.Response;
 import com.yahoo.jdisc.http.HttpRequest.Method;
 import com.yahoo.vespa.config.server.TestComponentRegistry;
 import com.yahoo.vespa.config.server.application.TenantApplications;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.http.SessionHandlerTest;
 import com.yahoo.vespa.config.server.tenant.TenantRepository;
 import org.junit.Before;
@@ -41,7 +42,7 @@ public class ListApplicationsHandlerTest {
 
     @Before
     public void setup() {
-        TenantRepository tenantRepository = new TenantRepository(componentRegistry);
+        TenantRepository tenantRepository = new TenantRepository(componentRegistry, new HostRegistry());
         tenantRepository.addTenant(mytenant);
         tenantRepository.addTenant(foobar);
         applicationRepo = tenantRepository.getTenant(mytenant).getApplicationRepo();
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/SessionActiveHandlerTest.java b/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/SessionActiveHandlerTest.java
index 23b711adc02..8e9ef42352c 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/SessionActiveHandlerTest.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/SessionActiveHandlerTest.java
@@ -15,6 +15,7 @@ import com.yahoo.vespa.config.server.MockProvisioner;
 import com.yahoo.vespa.config.server.TestComponentRegistry;
 import com.yahoo.vespa.config.server.TimeoutBudget;
 import com.yahoo.vespa.config.server.application.OrchestratorMock;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.http.HandlerTest;
 import com.yahoo.vespa.config.server.http.HttpErrorResponse;
 import com.yahoo.vespa.config.server.model.TestModelFactory;
@@ -79,7 +80,7 @@ public class SessionActiveHandlerTest {
                 .modelFactoryRegistry(new ModelFactoryRegistry(List.of((modelFactory))))
                 .configServerConfig(configserverConfig)
                 .build();
-        TenantRepository tenantRepository = new TenantRepository(componentRegistry);
+        TenantRepository tenantRepository = new TenantRepository(componentRegistry, new HostRegistry());
         tenantRepository.addTenant(tenantName);
         applicationRepository = new ApplicationRepository.Builder()
                 .withTenantRepository(tenantRepository)
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/SessionContentHandlerTest.java b/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/SessionContentHandlerTest.java
index 4f9b656dfb1..ce086cbfb15 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/SessionContentHandlerTest.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/SessionContentHandlerTest.java
@@ -14,6 +14,7 @@ import com.yahoo.vespa.config.server.ApplicationRepository;
 import com.yahoo.vespa.config.server.MockProvisioner;
 import com.yahoo.vespa.config.server.TestComponentRegistry;
 import com.yahoo.vespa.config.server.application.OrchestratorMock;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.http.ContentHandlerTestBase;
 import com.yahoo.vespa.config.server.http.SessionHandlerTest;
 import com.yahoo.vespa.config.server.session.PrepareParams;
@@ -60,7 +61,7 @@ public class SessionContentHandlerTest extends ContentHandlerTestBase {
                 .configServerConfig(configserverConfig)
                 .build();
 
-        tenantRepository = new TenantRepository(componentRegistry);
+        tenantRepository = new TenantRepository(componentRegistry, new HostRegistry());
         tenantRepository.addTenant(tenantName);
 
         ApplicationRepository applicationRepository = new ApplicationRepository.Builder()
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/SessionCreateHandlerTest.java b/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/SessionCreateHandlerTest.java
index 84feecec669..7efd448c3ed 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/SessionCreateHandlerTest.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/SessionCreateHandlerTest.java
@@ -11,6 +11,7 @@ import com.yahoo.vespa.config.server.MockProvisioner;
 import com.yahoo.vespa.config.server.TestComponentRegistry;
 import com.yahoo.vespa.config.server.application.CompressedApplicationInputStreamTest;
 import com.yahoo.vespa.config.server.application.OrchestratorMock;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.http.HttpErrorResponse;
 import com.yahoo.vespa.config.server.http.SessionHandlerTest;
 import com.yahoo.vespa.config.server.session.Session;
@@ -62,7 +63,7 @@ public class SessionCreateHandlerTest extends SessionHandlerTest {
 
     @Before
     public void setupRepo() {
-        TenantRepository tenantRepository = new TenantRepository(componentRegistry);
+        TenantRepository tenantRepository = new TenantRepository(componentRegistry, new HostRegistry());
         applicationRepository = new ApplicationRepository.Builder()
                 .withTenantRepository(tenantRepository)
                 .withProvisioner(new MockProvisioner())
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/SessionPrepareHandlerTest.java b/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/SessionPrepareHandlerTest.java
index d24faa1b433..ed65d8294b8 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/SessionPrepareHandlerTest.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/SessionPrepareHandlerTest.java
@@ -19,6 +19,7 @@ import com.yahoo.vespa.config.server.MockProvisioner;
 import com.yahoo.vespa.config.server.TestComponentRegistry;
 import com.yahoo.vespa.config.server.TimeoutBudget;
 import com.yahoo.vespa.config.server.application.OrchestratorMock;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.http.HttpErrorResponse;
 import com.yahoo.vespa.config.server.http.SessionHandler;
 import com.yahoo.vespa.config.server.http.SessionHandlerTest;
@@ -81,7 +82,7 @@ public class SessionPrepareHandlerTest extends SessionHandlerTest {
                 .build();
         Clock clock = componentRegistry.getClock();
         timeoutBudget = new TimeoutBudget(clock, Duration.ofSeconds(10));
-        tenantRepository = new TenantRepository(componentRegistry);
+        tenantRepository = new TenantRepository(componentRegistry, new HostRegistry());
         tenantRepository.addTenant(tenant);
         applicationRepository = new ApplicationRepository.Builder()
                 .withTenantRepository(tenantRepository)
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/TenantHandlerTest.java b/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/TenantHandlerTest.java
index 3d1d2f95e88..a8cc989c802 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/TenantHandlerTest.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/http/v2/TenantHandlerTest.java
@@ -19,6 +19,7 @@ import com.yahoo.vespa.config.server.ApplicationRepository;
 import com.yahoo.vespa.config.server.MockProvisioner;
 import com.yahoo.vespa.config.server.TestComponentRegistry;
 import com.yahoo.vespa.config.server.application.OrchestratorMock;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.session.PrepareParams;
 import com.yahoo.vespa.config.server.tenant.Tenant;
 import com.yahoo.vespa.config.server.tenant.TenantRepository;
@@ -56,7 +57,8 @@ public class TenantHandlerTest {
         tenantRepository = new TenantRepository(new TestComponentRegistry.Builder()
                                                         .curator(new MockCurator())
                                                         .configServerConfig(configserverConfig)
-                                                        .build());
+                                                        .build(),
+                                                new HostRegistry());
 
         applicationRepository = new ApplicationRepository.Builder()
                 .withTenantRepository(tenantRepository)
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/maintenance/MaintainerTester.java b/configserver/src/test/java/com/yahoo/vespa/config/server/maintenance/MaintainerTester.java
index 1f93f1ce6fe..1d8f60bb683 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/maintenance/MaintainerTester.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/maintenance/MaintainerTester.java
@@ -11,6 +11,7 @@ import com.yahoo.vespa.config.server.MockProvisioner;
 import com.yahoo.vespa.config.server.TestComponentRegistry;
 import com.yahoo.vespa.config.server.application.OrchestratorMock;
 import com.yahoo.vespa.config.server.deploy.DeployTester;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.modelfactory.ModelFactoryRegistry;
 import com.yahoo.vespa.config.server.session.PrepareParams;
 import com.yahoo.vespa.config.server.tenant.TenantRepository;
@@ -46,7 +47,7 @@ class MaintainerTester {
                 .provisioner(provisioner)
                 .modelFactoryRegistry(new ModelFactoryRegistry(List.of(new DeployTester.CountingModelFactory(clock))))
                 .build();
-        tenantRepository = new TenantRepository(componentRegistry);
+        tenantRepository = new TenantRepository(componentRegistry, new HostRegistry());
         applicationRepository = new ApplicationRepository.Builder()
                 .withTenantRepository(tenantRepository)
                 .withProvisioner(provisioner)
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/maintenance/TenantsMaintainerTest.java b/configserver/src/test/java/com/yahoo/vespa/config/server/maintenance/TenantsMaintainerTest.java
index 9bd7a25faf2..a072bf62852 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/maintenance/TenantsMaintainerTest.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/maintenance/TenantsMaintainerTest.java
@@ -56,7 +56,8 @@ public class TenantsMaintainerTest {
         assertNotNull(tenantRepository.getTenant(TenantName.defaultName()));
         assertNotNull(tenantRepository.getTenant(TenantRepository.HOSTED_VESPA_TENANT));
 
-        // Add tenant again and deploy
+        // Delete app, add tenant again and deploy
+        tester.applicationRepository().delete(applicationId(shouldNotBeDeleted));
         tenantRepository.addTenant(shouldBeDeleted);
         tester.deployApp(applicationPackage, prepareParams(shouldBeDeleted));
     }
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/rpc/MockRpcServer.java b/configserver/src/test/java/com/yahoo/vespa/config/server/rpc/MockRpcServer.java
index 7f4733f0b7c..997633eeb53 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/rpc/MockRpcServer.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/rpc/MockRpcServer.java
@@ -1,4 +1,4 @@
-// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
 package com.yahoo.vespa.config.server.rpc;
 
 import com.yahoo.cloud.config.ConfigserverConfig;
@@ -8,7 +8,7 @@ import com.yahoo.vespa.config.protocol.JRTServerConfigRequest;
 import com.yahoo.vespa.config.server.GetConfigContext;
 import com.yahoo.vespa.config.server.filedistribution.FileServer;
 import com.yahoo.vespa.config.server.host.ConfigRequestHostLivenessTracker;
-import com.yahoo.vespa.config.server.host.HostRegistries;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.monitoring.Metrics;
 import com.yahoo.vespa.config.server.rpc.security.NoopRpcAuthorizer;
 
@@ -37,7 +37,7 @@ public class MockRpcServer extends RpcServer {
         super(createConfig(port),
               null,
               Metrics.createTestMetrics(),
-              new HostRegistries(),
+              new HostRegistry(),
               new ConfigRequestHostLivenessTracker(),
               new FileServer(tempDir),
               new NoopRpcAuthorizer(),
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/rpc/RpcServerTest.java b/configserver/src/test/java/com/yahoo/vespa/config/server/rpc/RpcServerTest.java
index 735eae2700f..5a41eff3cc9 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/rpc/RpcServerTest.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/rpc/RpcServerTest.java
@@ -64,31 +64,19 @@ public class RpcServerTest {
         try (RpcTester tester = new RpcTester(applicationId, temporaryFolder)) {
             ApplicationRepository applicationRepository = tester.applicationRepository();
             applicationRepository.deploy(testApp, new PrepareParams.Builder().applicationId(applicationId).build());
-            TenantApplications applicationRepo = tester.tenant().getApplicationRepo();
-            RemoteSession activeSession = applicationRepository.getActiveRemoteSession(applicationId);
-            ApplicationSet applicationSet = tester.tenant().getSessionRepository().ensureApplicationLoaded(activeSession);
-            applicationRepo.activateApplication(applicationSet, activeSession.getSessionId());
             testPrintStatistics(tester);
             testGetConfig(tester);
             testEnabled(tester);
             testApplicationNotLoadedErrorWhenAppDeleted(tester);
-            testEmptySentinelConfigWhenAppDeletedOnHostedVespa();
         }
     }
 
-    private void testApplicationNotLoadedErrorWhenAppDeleted(RpcTester tester) throws InterruptedException, IOException {
-        tester.rpcServer().onTenantDelete(tenantName);
-        tester.rpcServer().onTenantsLoaded();
+    private void testApplicationNotLoadedErrorWhenAppDeleted(RpcTester tester) {
+        tester.applicationRepository().delete(applicationId);
         JRTClientConfigRequest clientReq = createSimpleRequest();
         tester.performRequest(clientReq.getRequest());
         assertFalse(clientReq.validateResponse());
         assertThat(clientReq.errorCode(), is(ErrorCode.APPLICATION_NOT_LOADED));
-        tester.stopRpc();
-        tester.createAndStartRpcServer();
-        tester.rpcServer().onTenantsLoaded();
-        clientReq = createSimpleRequest();
-        tester.performRequest(clientReq.getRequest());
-        assertTrue(clientReq.validateResponse());
     }
 
     @Test
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/rpc/RpcTester.java b/configserver/src/test/java/com/yahoo/vespa/config/server/rpc/RpcTester.java
index 2b2ed13fcfe..06c224b5a09 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/rpc/RpcTester.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/rpc/RpcTester.java
@@ -12,7 +12,6 @@ import com.yahoo.jrt.Supervisor;
 import com.yahoo.jrt.Transport;
 import com.yahoo.net.HostName;
 import com.yahoo.test.ManualClock;
-import com.yahoo.vespa.config.GenerationCounter;
 import com.yahoo.vespa.config.server.ApplicationRepository;
 import com.yahoo.vespa.config.server.MemoryGenerationCounter;
 import com.yahoo.vespa.config.server.MockProvisioner;
@@ -24,7 +23,7 @@ import com.yahoo.vespa.config.server.TestConfigDefinitionRepo;
 import com.yahoo.vespa.config.server.application.OrchestratorMock;
 import com.yahoo.vespa.config.server.filedistribution.FileServer;
 import com.yahoo.vespa.config.server.host.ConfigRequestHostLivenessTracker;
-import com.yahoo.vespa.config.server.host.HostRegistries;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.monitoring.Metrics;
 import com.yahoo.vespa.config.server.rpc.security.NoopRpcAuthorizer;
 import com.yahoo.vespa.config.server.tenant.Tenant;
@@ -55,15 +54,15 @@ public class RpcTester implements AutoCloseable {
     private final ManualClock clock = new ManualClock(Instant.ofEpochMilli(100));
     private final String myHostname = HostName.getLocalhost();
     private final HostLivenessTracker hostLivenessTracker = new ConfigRequestHostLivenessTracker(clock);
-    private final GenerationCounter generationCounter;
     private final Spec spec;
 
-    private RpcServer rpcServer;
+    private final RpcServer rpcServer;
     private Thread t;
     private Supervisor sup;
     private final ApplicationId applicationId;
     private final TenantName tenantName;
     private final TenantRepository tenantRepository;
+    private final HostRegistry hostRegistry = new HostRegistry();
 
     private final ApplicationRepository applicationRepository;
     private final List<Integer> allocatedPorts = new ArrayList<>();
@@ -85,23 +84,26 @@ public class RpcTester implements AutoCloseable {
                 .configDefinitionsDir(temporaryFolder.newFolder().getAbsolutePath())
                 .fileReferencesDir(temporaryFolder.newFolder().getAbsolutePath());
         configserverConfig = new ConfigserverConfig(configBuilder);
+        rpcServer = createRpcServer(configserverConfig);
         TestComponentRegistry componentRegistry = new TestComponentRegistry.Builder()
                 .configDefinitionRepo(new TestConfigDefinitionRepo())
                 .configServerConfig(configserverConfig)
+                .reloadListener(rpcServer)
                 .build();
-        tenantRepository = new TenantRepository(componentRegistry);
+        tenantRepository = new TenantRepository(componentRegistry, hostRegistry);
         tenantRepository.addTenant(tenantName);
+        startRpcServer();
         applicationRepository = new ApplicationRepository.Builder()
                 .withTenantRepository(tenantRepository)
+                .withConfigserverConfig(configserverConfig)
                 .withProvisioner(new MockProvisioner())
                 .withOrchestrator(new OrchestratorMock())
                 .build();
-        generationCounter = new MemoryGenerationCounter();
-        createAndStartRpcServer();
         assertFalse(hostLivenessTracker.lastRequestFrom(myHostname).isPresent());
     }
 
     public void close() {
+        rpcServer.stop();
         for (Integer port : allocatedPorts) {
             PortRangeAllocator.releasePort(port);
         }
@@ -113,24 +115,25 @@ public class RpcTester implements AutoCloseable {
         return port;
     }
 
-    void createAndStartRpcServer() throws IOException {
-        HostRegistries hostRegistries = new HostRegistries();
-        hostRegistries.createApplicationHostRegistry(tenantName).update(applicationId, List.of("localhost"));
-        hostRegistries.getTenantHostRegistry().update(tenantName, List.of("localhost"));
-        rpcServer = new RpcServer(configserverConfig,
-                                  new SuperModelRequestHandler(new TestConfigDefinitionRepo(),
-                                                               configserverConfig,
-                                                               new SuperModelManager(
-                                                                       configserverConfig,
-                                                                       Zone.defaultZone()   ,
-                                                                       generationCounter,
-                                                                       new InMemoryFlagSource())),
-                                  Metrics.createTestMetrics(),
-                                  hostRegistries,
-                                  hostLivenessTracker,
-                                  new FileServer(temporaryFolder.newFolder()),
-                                  new NoopRpcAuthorizer(),
-                                  new RpcRequestHandlerProvider());
+    RpcServer createRpcServer(ConfigserverConfig config) throws IOException {
+        return new RpcServer(config,
+                             new SuperModelRequestHandler(new TestConfigDefinitionRepo(),
+                                                          configserverConfig,
+                                                          new SuperModelManager(
+                                                                  config,
+                                                                  Zone.defaultZone(),
+                                                                  new MemoryGenerationCounter(),
+                                                                  new InMemoryFlagSource())),
+                             Metrics.createTestMetrics(),
+                             hostRegistry,
+                             hostLivenessTracker,
+                             new FileServer(temporaryFolder.newFolder()),
+                             new NoopRpcAuthorizer(),
+                             new RpcRequestHandlerProvider());
+    }
+
+    void startRpcServer()  {
+        hostRegistry.update(applicationId, List.of("localhost"));
         rpcServer.onTenantCreate(tenantRepository.getTenant(tenantName));
         t = new Thread(rpcServer);
         t.start();
@@ -165,7 +168,7 @@ public class RpcTester implements AutoCloseable {
 
     void performRequest(Request req) {
         clock.advance(Duration.ofMillis(10));
-        sup.connect(spec).invokeSync(req, 120.0);
+        sup.connect(spec).invokeSync(req, 10.0);
         if (req.methodName().equals(RpcServer.getConfigMethodName))
             assertEquals(clock.instant(), hostLivenessTracker.lastRequestFrom(myHostname).get());
     }
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/rpc/security/MultiTenantRpcAuthorizerTest.java b/configserver/src/test/java/com/yahoo/vespa/config/server/rpc/security/MultiTenantRpcAuthorizerTest.java
index 9e1edb35b8f..12debc347de 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/rpc/security/MultiTenantRpcAuthorizerTest.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/rpc/security/MultiTenantRpcAuthorizerTest.java
@@ -7,7 +7,6 @@ import com.yahoo.config.FileReference;
 import com.yahoo.config.provision.ApplicationId;
 import com.yahoo.config.provision.HostName;
 import com.yahoo.config.provision.NodeType;
-import com.yahoo.config.provision.TenantName;
 import com.yahoo.config.provision.security.NodeIdentifier;
 import com.yahoo.config.provision.security.NodeIdentifierException;
 import com.yahoo.config.provision.security.NodeIdentity;
@@ -66,7 +65,7 @@ public class MultiTenantRpcAuthorizerTest {
     @Test
     public void configserver_can_access_files_and_config() throws InterruptedException, ExecutionException {
         RpcAuthorizer authorizer = createAuthorizer(new NodeIdentity.Builder(NodeType.config).build(),
-                                                    new HostRegistry<>());
+                                                    new HostRegistry());
 
         Request configRequest = createConfigRequest(new ConfigKey<>("name", "configid", "namespace"), HOSTNAME);
         authorizer.authorizeConfigRequest(configRequest)
@@ -83,8 +82,8 @@ public class MultiTenantRpcAuthorizerTest {
                 .applicationId(APPLICATION_ID)
                 .build();
 
-        HostRegistry<TenantName> hostRegistry = new HostRegistry<>();
-        hostRegistry.update(APPLICATION_ID.tenant(), List.of(HOSTNAME.value()));
+        HostRegistry hostRegistry = new HostRegistry();
+        hostRegistry.update(APPLICATION_ID, List.of(HOSTNAME.value()));
 
         RpcAuthorizer authorizer = createAuthorizer(identity, hostRegistry);
 
@@ -99,7 +98,7 @@ public class MultiTenantRpcAuthorizerTest {
 
     @Test
     public void proxy_node_can_access_lbservice_config() throws ExecutionException, InterruptedException {
-        RpcAuthorizer authorizer = createAuthorizer(new NodeIdentity.Builder(NodeType.proxy).build(), new HostRegistry<>());
+        RpcAuthorizer authorizer = createAuthorizer(new NodeIdentity.Builder(NodeType.proxy).build(), new HostRegistry());
 
         Request configRequest = createConfigRequest(
                 new ConfigKey<>(LbServicesConfig.CONFIG_DEF_NAME, "*", LbServicesConfig.CONFIG_DEF_NAMESPACE),
@@ -110,7 +109,7 @@ public class MultiTenantRpcAuthorizerTest {
 
     @Test
     public void tenant_node_cannot_access_lbservice_config() throws ExecutionException, InterruptedException {
-        RpcAuthorizer authorizer = createAuthorizer(new NodeIdentity.Builder(NodeType.tenant).build(), new HostRegistry<>());
+        RpcAuthorizer authorizer = createAuthorizer(new NodeIdentity.Builder(NodeType.tenant).build(), new HostRegistry());
 
         Request configRequest = createConfigRequest(
                 new ConfigKey<>(LbServicesConfig.CONFIG_DEF_NAME, "*", LbServicesConfig.CONFIG_DEF_NAMESPACE),
@@ -129,8 +128,8 @@ public class MultiTenantRpcAuthorizerTest {
                 .applicationId(APPLICATION_ID)
                 .build();
 
-        HostRegistry<TenantName> hostRegistry = new HostRegistry<>();
-        hostRegistry.update(APPLICATION_ID.tenant(), List.of(HOSTNAME.value()));
+        HostRegistry hostRegistry = new HostRegistry();
+        hostRegistry.update(APPLICATION_ID, List.of(HOSTNAME.value()));
 
         RpcAuthorizer authorizer = createAuthorizer(identity, hostRegistry);
 
@@ -149,8 +148,8 @@ public class MultiTenantRpcAuthorizerTest {
                 .applicationId(EVIL_APP_ID)
                 .build();
 
-        HostRegistry<TenantName> hostRegistry = new HostRegistry<>();
-        hostRegistry.update(APPLICATION_ID.tenant(), List.of(HOSTNAME.value()));
+        HostRegistry hostRegistry = new HostRegistry();
+        hostRegistry.update(APPLICATION_ID, List.of(HOSTNAME.value()));
 
         RpcAuthorizer authorizer = createAuthorizer(identity, hostRegistry);
 
@@ -169,7 +168,7 @@ public class MultiTenantRpcAuthorizerTest {
                 .applicationId(EVIL_APP_ID)
                 .build();
 
-        HostRegistry<TenantName> hostRegistry = new HostRegistry<>();
+        HostRegistry hostRegistry = new HostRegistry();
 
         RpcAuthorizer authorizer = createAuthorizer(identity, hostRegistry);
 
@@ -188,8 +187,8 @@ public class MultiTenantRpcAuthorizerTest {
                 .applicationId(EVIL_APP_ID)
                 .build();
 
-        HostRegistry<TenantName> hostRegistry = new HostRegistry<>();
-        hostRegistry.update(EVIL_APP_ID.tenant(), List.of(HOSTNAME.value()));
+        HostRegistry hostRegistry = new HostRegistry();
+        hostRegistry.update(EVIL_APP_ID, List.of(HOSTNAME.value()));
 
         RpcAuthorizer authorizer = createAuthorizer(identity, hostRegistry);
 
@@ -208,7 +207,7 @@ public class MultiTenantRpcAuthorizerTest {
                 .applicationId(APPLICATION_ID)
                 .build();
 
-        HostRegistry<TenantName> hostRegistry = new HostRegistry<>();
+        HostRegistry hostRegistry = new HostRegistry();
 
         RpcAuthorizer authorizer = createAuthorizer(identity, hostRegistry);
 
@@ -219,7 +218,7 @@ public class MultiTenantRpcAuthorizerTest {
     }
 
 
-    private static RpcAuthorizer createAuthorizer(NodeIdentity identity, HostRegistry<TenantName> hostRegistry) {
+    private static RpcAuthorizer createAuthorizer(NodeIdentity identity, HostRegistry hostRegistry) {
         return new MultiTenantRpcAuthorizer(
                 new StaticNodeIdentifier(identity),
                 hostRegistry,
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/session/SessionPreparerTest.java b/configserver/src/test/java/com/yahoo/vespa/config/server/session/SessionPreparerTest.java
index 76958264d84..90d3bddc88d 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/session/SessionPreparerTest.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/session/SessionPreparerTest.java
@@ -187,7 +187,7 @@ public class SessionPreparerTest {
     @Test(expected = InvalidApplicationException.class)
     public void require_exception_for_overlapping_host() throws IOException {
         FilesApplicationPackage app = getApplicationPackage(testApp);
-        HostRegistry<ApplicationId> hostValidator = new HostRegistry<>();
+        HostRegistry hostValidator = new HostRegistry();
         hostValidator.update(applicationId("foo"), Collections.singletonList("mytesthost"));
         preparer.prepare(hostValidator, new BaseDeployLogger(), new PrepareParams.Builder().applicationId(applicationId("default")).build(),
                          Optional.empty(), Instant.now(), app.getAppDir(), app, createSessionZooKeeperClient());
@@ -200,7 +200,7 @@ public class SessionPreparerTest {
             if (level.equals(Level.WARNING) && message.contains("The host mytesthost is already in use")) logged.append("ok");
         };
         FilesApplicationPackage app = getApplicationPackage(testApp);
-        HostRegistry<ApplicationId> hostValidator = new HostRegistry<>();
+        HostRegistry hostValidator = new HostRegistry();
         ApplicationId applicationId = applicationId();
         hostValidator.update(applicationId, Collections.singletonList("mytesthost"));
         preparer.prepare(hostValidator, logger, new PrepareParams.Builder().applicationId(applicationId).build(),
@@ -367,7 +367,7 @@ public class SessionPreparerTest {
 
     private PrepareResult prepare(File app, PrepareParams params, long sessionId) throws IOException {
         FilesApplicationPackage applicationPackage = getApplicationPackage(app);
-        return preparer.prepare(new HostRegistry<>(), getLogger(), params,
+        return preparer.prepare(new HostRegistry(), getLogger(), params,
                                 Optional.empty(), Instant.now(), applicationPackage.getAppDir(),
                                 applicationPackage, createSessionZooKeeperClient(sessionId));
     }
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/session/SessionRepositoryTest.java b/configserver/src/test/java/com/yahoo/vespa/config/server/session/SessionRepositoryTest.java
index bfcfc7d6e43..b2cfd7015ba 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/session/SessionRepositoryTest.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/session/SessionRepositoryTest.java
@@ -20,6 +20,7 @@ import com.yahoo.vespa.config.server.MockProvisioner;
 import com.yahoo.vespa.config.server.TestComponentRegistry;
 import com.yahoo.vespa.config.server.application.ApplicationSet;
 import com.yahoo.vespa.config.server.application.OrchestratorMock;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.http.InvalidApplicationException;
 import com.yahoo.vespa.config.server.modelfactory.ModelFactoryRegistry;
 import com.yahoo.vespa.config.server.tenant.TenantRepository;
@@ -60,6 +61,7 @@ public class SessionRepositoryTest {
     private static final TenantName tenantName = TenantName.defaultName();
     private static final ApplicationId applicationId = ApplicationId.from(tenantName.value(), "testApp", "default");
     private static final File testApp = new File("src/test/apps/app");
+    private static final File appJdiscOnly = new File("src/test/apps/app-jdisc-only");
 
     private MockCurator curator;
     private TenantRepository tenantRepository;
@@ -90,7 +92,7 @@ public class SessionRepositoryTest {
                                             .build())
                 .flagSource(flagSource)
                 .build();
-        tenantRepository = new TenantRepository(globalComponentRegistry);
+        tenantRepository = new TenantRepository(globalComponentRegistry, new HostRegistry());
         tenantRepository.addTenant(SessionRepositoryTest.tenantName);
         applicationRepository = new ApplicationRepository.Builder()
                 .withTenantRepository(tenantRepository)
@@ -135,7 +137,7 @@ public class SessionRepositoryTest {
         // tenant is "newTenant"
         TenantName newTenant = TenantName.from("newTenant");
         tenantRepository.addTenant(newTenant);
-        long sessionId = deploy(ApplicationId.from(newTenant.value(), "testapp", "default"));
+        long sessionId = deploy(ApplicationId.from(newTenant.value(), "testapp", "default"), appJdiscOnly);
         SessionRepository sessionRepository2 = tenantRepository.getTenant(newTenant).getSessionRepository();
         assertNotNull(sessionRepository2.getLocalSession(sessionId));
     }
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/tenant/TenantRepositoryTest.java b/configserver/src/test/java/com/yahoo/vespa/config/server/tenant/TenantRepositoryTest.java
index 4900c50f1d7..dbc352128f5 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/tenant/TenantRepositoryTest.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/tenant/TenantRepositoryTest.java
@@ -19,6 +19,7 @@ import com.yahoo.vespa.config.server.application.Application;
 import com.yahoo.vespa.config.server.application.ApplicationSet;
 import com.yahoo.vespa.config.server.application.TenantApplications;
 import com.yahoo.vespa.config.server.application.TenantApplicationsTest;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import com.yahoo.vespa.config.server.monitoring.MetricUpdater;
 import com.yahoo.vespa.curator.Curator;
 import com.yahoo.vespa.curator.mock.MockCurator;
@@ -66,7 +67,7 @@ public class TenantRepositoryTest {
         listener = (TenantApplicationsTest.MockReloadListener)globalComponentRegistry.getReloadListener();
         tenantListener = (MockTenantListener)globalComponentRegistry.getTenantListener();
         assertFalse(tenantListener.tenantsLoaded);
-        tenantRepository = new TenantRepository(globalComponentRegistry);
+        tenantRepository = new TenantRepository(globalComponentRegistry, new HostRegistry());
         assertTrue(tenantListener.tenantsLoaded);
         tenantRepository.addTenant(tenant1);
         tenantRepository.addTenant(tenant2);
@@ -201,7 +202,7 @@ public class TenantRepositoryTest {
     private static class FailingDuringBootstrapTenantRepository extends TenantRepository {
 
         public FailingDuringBootstrapTenantRepository(GlobalComponentRegistry globalComponentRegistry) {
-            super(globalComponentRegistry);
+            super(globalComponentRegistry, new HostRegistry());
         }
 
         @Override
diff --git a/configserver/src/test/java/com/yahoo/vespa/config/server/tenant/TenantTest.java b/configserver/src/test/java/com/yahoo/vespa/config/server/tenant/TenantTest.java
index ac596198fe5..1b754ca6695 100644
--- a/configserver/src/test/java/com/yahoo/vespa/config/server/tenant/TenantTest.java
+++ b/configserver/src/test/java/com/yahoo/vespa/config/server/tenant/TenantTest.java
@@ -4,6 +4,7 @@ package com.yahoo.vespa.config.server.tenant;
 import com.google.common.testing.EqualsTester;
 import com.yahoo.config.provision.TenantName;
 import com.yahoo.vespa.config.server.TestComponentRegistry;
+import com.yahoo.vespa.config.server.host.HostRegistry;
 import org.junit.Before;
 import org.junit.Test;
 
@@ -32,7 +33,7 @@ public class TenantTest {
     }
 
     private Tenant createTenant(String name) {
-        TenantRepository tenantRepository = new TenantRepository(componentRegistry);
+        TenantRepository tenantRepository = new TenantRepository(componentRegistry, new HostRegistry());
         TenantName tenantName = TenantName.from(name);
         tenantRepository.addTenant(tenantName);
         return tenantRepository.getTenant(tenantName);
diff --git a/configserver/src/test/resources/deploy/advancedapp/services.xml b/configserver/src/test/resources/deploy/advancedapp/services.xml
index e3d5aea585b..b8e93b14317 100644
--- a/configserver/src/test/resources/deploy/advancedapp/services.xml
+++ b/configserver/src/test/resources/deploy/advancedapp/services.xml
@@ -22,7 +22,7 @@
         <documents>
             <document type="keyvalue" mode="index"/>
         </documents>
-        <nodes>>
+        <nodes>
             <node hostalias="node1" distribution-key="0"/>
         </nodes>
     </content>