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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.config.server.maintenance;
import com.yahoo.concurrent.maintenance.JobControl;
import com.yahoo.concurrent.maintenance.JobControlState;
import com.yahoo.concurrent.maintenance.JobMetrics;
import com.yahoo.concurrent.maintenance.Maintainer;
import com.yahoo.jdisc.Metric;
import com.yahoo.path.Path;
import com.yahoo.transaction.Mutex;
import com.yahoo.vespa.config.server.ApplicationRepository;
import com.yahoo.vespa.curator.Curator;
import com.yahoo.vespa.flags.FlagSource;
import com.yahoo.vespa.flags.ListFlag;
import com.yahoo.vespa.flags.PermanentFlags;
import java.time.Duration;
import java.time.Instant;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
/**
* A maintainer is some job which runs at a fixed interval to perform some maintenance task in the config server.
*
* @author hmusum
*/
public abstract class ConfigServerMaintainer extends Maintainer {
protected final ApplicationRepository applicationRepository;
/** Creates a maintainer where maintainers on different nodes in this cluster run with even delay. */
ConfigServerMaintainer(ApplicationRepository applicationRepository, Curator curator, FlagSource flagSource,
Instant now, Duration interval, boolean useLock) {
super(null, interval, now, new JobControl(new JobControlFlags(curator, flagSource, useLock)),
new ConfigServerJobMetrics(applicationRepository.metric()), cluster(curator), false);
this.applicationRepository = applicationRepository;
}
private static class ConfigServerJobMetrics extends JobMetrics {
private final Metric metric;
public ConfigServerJobMetrics(Metric metric) {
this.metric = metric;
}
@Override
public void completed(String job, double successFactor) {
metric.set("maintenance.successFactor", successFactor, metric.createContext(Map.of("job", job)));
}
}
private static class JobControlFlags implements JobControlState {
private static final Path root = Path.fromString("/configserver/v1/");
private static final Path lockRoot = root.append("locks");
private final Curator curator;
private final ListFlag<String> inactiveJobsFlag;
private final boolean useLock;
public JobControlFlags(Curator curator, FlagSource flagSource, boolean useLock) {
this.curator = curator;
this.inactiveJobsFlag = PermanentFlags.INACTIVE_MAINTENANCE_JOBS.bindTo(flagSource);
this.useLock = useLock;
}
@Override
public Set<String> readInactiveJobs() {
return Set.copyOf(inactiveJobsFlag.value());
}
@Override
public Mutex lockMaintenanceJob(String job) {
return (useLock)
? curator.lock(lockRoot.append(job), Duration.ofSeconds(1))
: () -> { };
}
}
/** Returns all hosts configured to be part of this ZooKeeper cluster */
public static List<String> cluster(Curator curator) {
return Arrays.stream(curator.zooKeeperEnsembleConnectionSpec().split(","))
.filter(hostAndPort -> !hostAndPort.isEmpty())
.map(hostAndPort -> hostAndPort.split(":")[0])
.toList();
}
}
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