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Keeps track of node assignment in a multi-application setup.
// 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.jdisc.Metric;
import com.yahoo.vespa.hosted.provision.Node;
import com.yahoo.vespa.hosted.provision.NodeList;
import com.yahoo.vespa.hosted.provision.NodeMutex;
import com.yahoo.vespa.hosted.provision.NodeRepository;
import com.yahoo.vespa.hosted.provision.backup.Snapshot;
import com.yahoo.vespa.hosted.provision.provisioning.HostProvisioner;
import com.yahoo.vespa.hosted.provision.provisioning.HostProvisioner.RebuildResult;
import com.yahoo.yolean.Exceptions;
import java.time.Duration;
import java.util.List;
import java.util.Optional;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Rebuilds hosts by replacing the root disk (only supports hosts with remote storage).
*
* @author mpolden
*/
public class DiskReplacer extends NodeRepositoryMaintainer {
private static final Logger log = Logger.getLogger(DiskReplacer.class.getName());
private final HostProvisioner hostProvisioner;
DiskReplacer(NodeRepository nodeRepository, Duration interval, Metric metric, HostProvisioner hostProvisioner) {
super(nodeRepository, interval, metric);
this.hostProvisioner = hostProvisioner;
}
@Override
protected double maintain() {
NodeList candidates = nodeRepository().nodes().list().rebuilding(true);
if (candidates.isEmpty()) {
return 0;
}
int failures = 0;
List rebuilding;
try (var locked = nodeRepository().nodes().lockAndGetAll(candidates.asList(), Optional.of(Duration.ofSeconds(10)))) {
rebuilding = locked.nodes().stream().map(NodeMutex::node).toList();
RebuildResult result = hostProvisioner.replaceRootDisk(rebuilding);
for (Node updated : result.rebuilt()) {
if (!updated.status().wantToRebuild()) {
NodeList children = nodeRepository().nodes().list().childrenOf(updated);
restoreSnapshotsOf(children);
nodeRepository().nodes().write(updated, () -> {});
}
}
for (var entry : result.failed().entrySet()) {
++failures;
log.log(Level.WARNING, "Failed to rebuild " + entry.getKey() + ", will retry in " +
interval() + ": " + Exceptions.toMessageString(entry.getValue()));
}
}
return asSuccessFactorDeviation(rebuilding.size(), failures);
}
private void restoreSnapshotsOf(NodeList children) {
for (Node child : children) {
Optional snapshot = child.status().snapshot();
if (snapshot.isPresent() && snapshot.get().state() == Snapshot.State.created) {
nodeRepository().snapshots().restore(snapshot.get().id(), child.hostname());
}
}
}
}
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