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// 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;
import com.google.inject.Inject;
import com.yahoo.cloud.config.ConfigserverConfig;
import com.yahoo.component.AbstractComponent;
import com.yahoo.concurrent.DaemonThreadFactory;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.config.provision.Deployment;
import com.yahoo.container.handler.VipStatus;
import com.yahoo.container.jdisc.state.StateMonitor;
import com.yahoo.log.LogLevel;
import com.yahoo.vespa.config.server.rpc.RpcServer;
import com.yahoo.vespa.config.server.version.VersionState;
import java.time.Duration;
import java.time.Instant;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
/**
* Main component that bootstraps and starts config server threads.
*
* If config server has been upgraded to a new version since the last time it was running it will redeploy all
* applications. If that is done successfully the RPC server will start and the health status code will change from
* 'initializing' to 'up' and the config server will be put into rotation (start serving status.html with 200 OK)
*
* @author Ulf Lilleengen
* @author hmusum
*/
public class ConfigServerBootstrap extends AbstractComponent implements Runnable {
private static final java.util.logging.Logger log = java.util.logging.Logger.getLogger(ConfigServerBootstrap.class.getName());
private static final String vipStatusClusterIdentifier = "configserver";
enum MainThread {START, DO_NOT_START}
enum RedeployingApplicationsFails {EXIT_JVM, CONTINUE}
private final ApplicationRepository applicationRepository;
private final RpcServer server;
private final Thread serverThread;
private final VersionState versionState;
private final StateMonitor stateMonitor;
private final VipStatus vipStatus;
private final ConfigserverConfig configserverConfig;
private final Duration maxDurationOfRedeployment;
private final Duration sleepTimeWhenRedeployingFails;
private final RedeployingApplicationsFails exitIfRedeployingApplicationsFails;
private final ExecutorService rpcServerExecutor;
// The tenants object is injected so that all initial requests handlers are
// added to the rpc server before it starts answering rpc requests.
@SuppressWarnings("WeakerAccess")
@Inject
public ConfigServerBootstrap(ApplicationRepository applicationRepository, RpcServer server,
VersionState versionState, StateMonitor stateMonitor, VipStatus vipStatus) {
this(applicationRepository, server, versionState, stateMonitor, vipStatus, MainThread.START, RedeployingApplicationsFails.EXIT_JVM);
}
// For testing only
ConfigServerBootstrap(ApplicationRepository applicationRepository, RpcServer server, VersionState versionState,
StateMonitor stateMonitor, VipStatus vipStatus, MainThread mainThread,
RedeployingApplicationsFails exitIfRedeployingApplicationsFails) {
this.applicationRepository = applicationRepository;
this.server = server;
this.versionState = versionState;
this.stateMonitor = stateMonitor;
this.serverThread = new Thread(this, "configserver main");
this.vipStatus = vipStatus;
this.configserverConfig = applicationRepository.configserverConfig();
this.maxDurationOfRedeployment = Duration.ofSeconds(configserverConfig.maxDurationOfBootstrap());
this.sleepTimeWhenRedeployingFails = Duration.ofSeconds(configserverConfig.sleepTimeWhenRedeployingFails());
this.exitIfRedeployingApplicationsFails = exitIfRedeployingApplicationsFails;
rpcServerExecutor = Executors.newSingleThreadExecutor(new DaemonThreadFactory("config server RPC server"));
initializing(); // Initially take server out of rotation
if (mainThread == MainThread.START)
start();
}
@Override
public void deconstruct() {
log.log(LogLevel.INFO, "Stopping config server");
down();
server.stop();
rpcServerExecutor.shutdown();
try {
serverThread.join();
} catch (InterruptedException e) {
log.log(LogLevel.WARNING, "Error joining server thread on shutdown: " + e.getMessage());
}
}
@Override
public void run() {
if (versionState.isUpgraded()) {
log.log(LogLevel.INFO, "Configserver upgrading from " + versionState.storedVersion() + " to "
+ versionState.currentVersion() + ". Redeploying all applications");
try {
if ( ! redeployAllApplications()) {
redeployingApplicationsFailed();
return; // Status will not be set to 'up' since we return here
}
versionState.saveNewVersion();
log.log(LogLevel.INFO, "All applications redeployed successfully");
} catch (Exception e) {
log.log(LogLevel.ERROR, "Redeployment of applications failed", e);
redeployingApplicationsFailed();
return; // Status will not be set to 'up' since we return here
}
}
startRpcServer();
up();
do {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
log.log(LogLevel.ERROR, "Got interrupted", e);
break;
}
} while (server.isRunning());
down();
log.log(LogLevel.INFO, "RPC server stopped");
}
StateMonitor.Status status() {
return stateMonitor.status();
}
private void start() {
serverThread.start();
}
private void up() {
stateMonitor.status(StateMonitor.Status.up);
vipStatus.addToRotation(vipStatusClusterIdentifier);
}
private void down() {
stateMonitor.status(StateMonitor.Status.down);
vipStatus.removeFromRotation(vipStatusClusterIdentifier);
}
private void initializing() {
// This is default value (from config), so not strictly necessary
stateMonitor.status(StateMonitor.Status.initializing);
vipStatus.removeFromRotation(vipStatusClusterIdentifier);
}
private void startRpcServer() {
log.log(LogLevel.INFO, "Starting RPC server");
rpcServerExecutor.execute(server);
Instant end = Instant.now().plus(Duration.ofSeconds(10));
while (!server.isRunning() && Instant.now().isBefore(end)) {
try {
Thread.sleep(10);
} catch (InterruptedException e) {
log.log(LogLevel.ERROR, "Got interrupted", e);
break;
}
}
if (!server.isRunning())
throw new RuntimeException("RPC server not started in 10 seconds");
log.log(LogLevel.INFO, "RPC server started");
}
private void redeployingApplicationsFailed() {
if (exitIfRedeployingApplicationsFails == RedeployingApplicationsFails.EXIT_JVM) System.exit(1);
}
private boolean redeployAllApplications() throws InterruptedException {
Instant end = Instant.now().plus(maxDurationOfRedeployment);
Set<ApplicationId> applicationsNotRedeployed = applicationRepository.listApplications();
do {
applicationsNotRedeployed = redeployApplications(applicationsNotRedeployed);
if ( ! applicationsNotRedeployed.isEmpty()) {
Thread.sleep(sleepTimeWhenRedeployingFails.toMillis());
}
} while ( ! applicationsNotRedeployed.isEmpty() && Instant.now().isBefore(end));
if ( ! applicationsNotRedeployed.isEmpty()) {
log.log(LogLevel.ERROR, "Redeploying applications not finished after " + maxDurationOfRedeployment +
", exiting, applications that failed redeployment: " + applicationsNotRedeployed);
return false;
}
return true;
}
// Returns the set of applications that failed to redeploy
private Set<ApplicationId> redeployApplications(Set<ApplicationId> applicationIds) throws InterruptedException {
ExecutorService executor = Executors.newFixedThreadPool(configserverConfig.numParallelTenantLoaders(),
new DaemonThreadFactory("redeploy apps"));
// Keep track of deployment per application
Map<ApplicationId, Future<?>> futures = new HashMap<>();
Set<ApplicationId> failedDeployments = new HashSet<>();
for (ApplicationId appId : applicationIds) {
Optional<Deployment> deploymentOptional = applicationRepository.deployFromLocalActive(appId, true /* bootstrap */);
if ( ! deploymentOptional.isPresent()) continue;
futures.put(appId, executor.submit(deploymentOptional.get()::activate));
}
for (Map.Entry<ApplicationId, Future<?>> f : futures.entrySet()) {
try {
f.getValue().get();
} catch (ExecutionException e) {
ApplicationId app = f.getKey();
log.log(LogLevel.WARNING, "Redeploying " + app + " failed, will retry", e);
failedDeployments.add(app);
}
}
executor.shutdown();
executor.awaitTermination(365, TimeUnit.DAYS); // Timeout should never happen
return failedDeployments;
}
}
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