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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.provision.maintenance;
import com.yahoo.component.Version;
import com.yahoo.component.Vtag;
import com.yahoo.config.provision.NodeType;
import com.yahoo.vespa.curator.Lock;
import com.yahoo.vespa.hosted.provision.persistence.CuratorDb;
import java.util.Collections;
import java.util.Map;
import java.util.Optional;
import java.util.logging.Logger;
/**
* Multithread safe class to see and set target versions for infrastructure node types.
* {@link InfrastructureProvisioner} maintainer will then allocate the nodes of given node type
* with a wanted version equal to the given target version.
*
* @author freva
*/
public class InfrastructureVersions {
private static final Logger logger = Logger.getLogger(InfrastructureVersions.class.getName());
private final CuratorDb db;
private final Version defaultVersion;
public InfrastructureVersions(CuratorDb db) {
this(db, Vtag.currentVersion);
}
InfrastructureVersions(CuratorDb db, Version defaultVersion) {
this.db = db;
this.defaultVersion = defaultVersion;
}
public void setTargetVersion(NodeType nodeType, Version newTargetVersion, boolean force) {
assertLegalNodeTypeForTargetVersion(nodeType);
try (Lock lock = db.lockInfrastructureVersions()) {
Map<NodeType, Version> infrastructureVersions = db.readInfrastructureVersions();
Version currentTargetVersion = Optional.ofNullable(infrastructureVersions.get(nodeType))
.orElse(Version.emptyVersion);
// Trying to set the version to the current version, skip
if (currentTargetVersion.equals(newTargetVersion)) return;
// If we don't force the set, we must set the new version to higher than the already set version
if (!force && currentTargetVersion.isAfter(newTargetVersion)) {
throw new IllegalArgumentException(String.format("Cannot downgrade version without setting 'force'. Current target version: %s, attempted to set target version: %s",
currentTargetVersion.toFullString(), newTargetVersion.toFullString()));
}
if (newTargetVersion.isEmpty()) {
infrastructureVersions.remove(nodeType);
logger.info("Removing target version for " + nodeType);
} else {
infrastructureVersions.put(nodeType, newTargetVersion);
logger.info("Setting target version for " + nodeType + " to " + newTargetVersion.toFullString());
}
db.writeInfrastructureVersions(infrastructureVersions);
}
}
public Version getTargetVersionFor(NodeType nodeType) {
assertLegalNodeTypeForTargetVersion(nodeType);
return Optional.ofNullable(db.readInfrastructureVersions().get(nodeType)).orElseGet(() -> {
// Target version has never been set for this node type, set it to the default version of this server.
// We need to set the version (in ZK) to prevent another config server from returning a different version.
// No lock needed since this is only an issue in bootstrap case and in a potential race, all versions
// are equally valid
setTargetVersion(nodeType, defaultVersion, false);
return defaultVersion;
});
}
public Map<NodeType, Version> getTargetVersions() {
return Collections.unmodifiableMap(db.readInfrastructureVersions());
}
private static void assertLegalNodeTypeForTargetVersion(NodeType nodeType) {
switch (nodeType) {
case config:
case confighost:
case controller:
case controllerhost:
case proxyhost:
case host:
break;
default:
throw new IllegalArgumentException("Target version for type " + nodeType + " is not allowed");
}
}
}
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