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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.orchestrator.policy;
import com.yahoo.config.provision.Zone;
import com.yahoo.vespa.applicationmodel.ClusterId;
import com.yahoo.vespa.applicationmodel.ServiceType;
import com.yahoo.vespa.flags.FlagSource;
import com.yahoo.vespa.orchestrator.model.ClusterApi;
import com.yahoo.vespa.orchestrator.model.VespaModelUtil;
import java.util.Optional;
import java.util.Set;
import static com.yahoo.vespa.orchestrator.policy.HostedVespaPolicy.ENOUGH_SERVICES_UP_CONSTRAINT;
public class HostedVespaClusterPolicy implements ClusterPolicy {
private final Zone zone;
public HostedVespaClusterPolicy(FlagSource flagSource, Zone zone) {
this.zone = zone;
}
@Override
public SuspensionReasons verifyGroupGoingDownIsFine(ClusterApi clusterApi) throws HostStateChangeDeniedException {
return verifyGroupGoingDownIsFine(clusterApi, false);
}
@Override
public void verifyGroupGoingDownPermanentlyIsFine(ClusterApi clusterApi) throws HostStateChangeDeniedException {
verifyGroupGoingDownIsFine(clusterApi, true);
}
private SuspensionReasons verifyGroupGoingDownIsFine(ClusterApi clusterApi, boolean permanent)
throws HostStateChangeDeniedException {
if (clusterApi.noServicesOutsideGroupIsDown()) {
return SuspensionReasons.nothingNoteworthy();
}
SuspensionLimit limit = getConcurrentSuspensionLimit(clusterApi);
if (clusterApi.servicesDownIfGroupIsAllowedToBeDown() <= limit.allowedDown())
return SuspensionReasons.nothingNoteworthy();
if (clusterApi.percentageOfServicesDownIfGroupIsAllowedToBeDown() <= limit.allowedDownPercentage())
return SuspensionReasons.nothingNoteworthy();
// Be a bit more cautious when removing nodes permanently
if (!permanent) {
Optional<SuspensionReasons> suspensionReasons = clusterApi.allServicesDown();
if (suspensionReasons.isPresent()) {
return suspensionReasons.get();
}
}
final String message;
if (limit.allowedDownPercentage() > 0) {
final String numberDescription;
final String fromDescription;
final String toDescription;
final String limitDescription;
if (limit.allowedDown() > 1) {
numberDescription = "number (percentage)";
fromDescription = clusterApi.servicesDownOutsideGroup() + " (" + clusterApi.percentageOfServicesDownOutsideGroup() + "%)";
toDescription = clusterApi.servicesDownIfGroupIsAllowedToBeDown() + " (" + clusterApi.percentageOfServicesDownIfGroupIsAllowedToBeDown() + "%)";
limitDescription = limit.allowedDown() + " (" + limit.allowedDownPercentage() + "%)";
} else {
numberDescription = "percentage";
fromDescription = clusterApi.percentageOfServicesDownOutsideGroup() + "%";
toDescription = clusterApi.percentageOfServicesDownIfGroupIsAllowedToBeDown() + "%";
limitDescription = limit.allowedDownPercentage() + "%";
}
message = "The %s of %s that are down would increase from %s to %s which is beyond the limit of %s"
.formatted(numberDescription, clusterApi.serviceDescription(true), fromDescription, toDescription, limitDescription);
} else {
message = "%d %s %s already down".formatted(clusterApi.servicesDownOutsideGroup(),
clusterApi.serviceDescription(false),
clusterApi.servicesDownOutsideGroup() == 1 ? "is" : "are");
}
throw new HostStateChangeDeniedException(clusterApi.getNodeGroup(),
ENOUGH_SERVICES_UP_CONSTRAINT,
message + ":" + clusterApi.downDescription());
}
// Non-private for testing purposes
SuspensionLimit getConcurrentSuspensionLimit(ClusterApi clusterApi) {
// Possible service clusters on a node as of 2021-01-22:
//
// CLUSTER ID SERVICE TYPE HEALTH ASSOCIATION
// 1 CCN-controllers container-clustercontrollers Slobrok 1, 3, or 6 in content cluster
// 2 CCN distributor Slobrok content cluster
// 3 CCN storagenode Slobrok content cluster
// 4 CCN searchnode Slobrok content cluster
// 5 CCN transactionlogserver not checked content cluster
// 6 JCCN container Slobrok jdisc container cluster
// 7 admin slobrok not checked 1-3 in jdisc container cluster
// 8 metrics metricsproxy-container Slobrok application
// 9 admin logd not checked application
// 10 admin config-sentinel not checked application
// 11 admin configproxy not checked application
// 12 admin logforwarder not checked application
// 13 controller controller state/v1 controllers
// 14 zone-config-servers configserver state/v1 config servers
// 15 controller-host hostadmin state/v1 controller hosts
// 16 configserver-host hostadmin state/v1 config server hosts
// 17 tenant-host hostadmin state/v1 tenant hosts
// 18 proxy-host hostadmin state/v1 proxy hosts
//
// CCN refers to the content cluster's name, as specified in services.xml.
// JCCN refers to the jdisc container cluster's name, as specified in services.xml.
//
// For instance a content node will have 2-5 and 8-12 and possibly 1, while a combined
// cluster node may have all 1-12.
//
// The services on a node can be categorized into these main types, ref association column above:
// A content
// B container
// C tenant host
// D config server
// E config server host
// F controller
// G controller host
// H proxy (same as B)
// I proxy host
Optional<SuspensionLimit> override = clusterApi.clusterPolicyOverride().getSuspensionLimit();
if (override.isPresent()) {
return override.get();
}
if (clusterApi.serviceType().equals(ServiceType.CLUSTER_CONTROLLER)) {
return SuspensionLimit.fromAllowedDown(1);
}
if (Set.of(ServiceType.STORAGE, ServiceType.SEARCH, ServiceType.DISTRIBUTOR, ServiceType.TRANSACTION_LOG_SERVER)
.contains(clusterApi.serviceType())) {
// Delegate to the cluster controller
return SuspensionLimit.fromAllowedDownRatio(1);
}
if (clusterApi.serviceType().equals(ServiceType.CONTAINER)) {
return SuspensionLimit.fromAllowedDownRatio(0.1);
}
if (VespaModelUtil.ADMIN_CLUSTER_ID.equals(clusterApi.clusterId())) {
if (ServiceType.SLOBROK.equals(clusterApi.serviceType())) {
return SuspensionLimit.fromAllowedDown(1);
}
return SuspensionLimit.fromAllowedDownRatio(1);
} else if (ServiceType.METRICS_PROXY.equals(clusterApi.serviceType())) {
return SuspensionLimit.fromAllowedDownRatio(1);
}
if (Set.of(ServiceType.CONFIG_SERVER, ServiceType.CONTROLLER).contains(clusterApi.serviceType())) {
return SuspensionLimit.fromAllowedDown(1);
}
if (clusterApi.serviceType().equals(ServiceType.HOST_ADMIN)) {
if (Set.of(ClusterId.CONFIG_SERVER_HOST, ClusterId.CONTROLLER_HOST).contains(clusterApi.clusterId())) {
return SuspensionLimit.fromAllowedDown(1);
}
return zone.system().isCd()
? SuspensionLimit.fromAllowedDownRatio(0.5)
: SuspensionLimit.fromAllowedDownRatio(0.2);
}
// The above should cover all cases, but if not we'll return a reasonable default:
return SuspensionLimit.fromAllowedDownRatio(0.1);
}
}
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