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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.hosted.provision.restapi;
import com.yahoo.container.jdisc.HttpResponse;
import com.yahoo.net.HostName;
import com.yahoo.slime.Cursor;
import com.yahoo.slime.JsonFormat;
import com.yahoo.slime.Slime;
import com.yahoo.vespa.curator.stats.LatencyMetrics;
import com.yahoo.vespa.curator.stats.LockMetrics;
import com.yahoo.vespa.curator.stats.LockStats;
import com.yahoo.vespa.curator.stats.LockAttempt;
import com.yahoo.vespa.curator.stats.RecordedLockAttempts;
import com.yahoo.vespa.curator.stats.ThreadLockStats;
import java.io.IOException;
import java.io.OutputStream;
import java.time.Duration;
import java.time.Instant;
import java.util.Comparator;
import java.util.List;
import java.util.Optional;
import java.util.TreeMap;
import java.util.stream.Collectors;
/**
* Returns information related to ZooKeeper locks.
*
* @author hakon
*/
public class LocksResponse extends HttpResponse {
private final Slime slime = new Slime();
public LocksResponse() {
this(HostName.getLocalhost(),
new TreeMap<>(LockStats.getGlobal().getLockMetricsByPath()),
LockStats.getGlobal().getThreadLockStats(),
LockStats.getGlobal().getLockAttemptSamples());
}
/** For testing */
LocksResponse(String hostname,
TreeMap<String, LockMetrics> lockMetricsByPath,
List<ThreadLockStats> threadLockStatsList,
List<LockAttempt> historicSamples) {
super(200);
Cursor root = slime.setObject();
root.setString("hostname", hostname);
root.setString("time", Instant.now().toString());
Cursor threadsCursor = root.setArray("threads");
for (var threadLockStats : threadLockStatsList) {
Optional<LockAttempt> ongoingLockAttempt = threadLockStats.getTopMostOngoingLockAttempt();
Optional<RecordedLockAttempts> ongoingRecording = threadLockStats.getOngoingRecording();
if (ongoingLockAttempt.isEmpty() && ongoingRecording.isEmpty()) {
continue;
}
Cursor threadCursor = threadsCursor.addObject();
threadCursor.setString("thread-name", threadLockStats.getThreadName());
ongoingLockAttempt.ifPresent(lockAttempt -> {
setLockAttempt(threadCursor.setObject("active-lock"), lockAttempt, false, false);
threadCursor.setString("stack-trace", threadLockStats.getStackTrace());
});
ongoingRecording.ifPresent(recording -> setRecording(threadCursor.setObject("ongoing-recording"), recording));
}
Cursor historicSamplesCursor = root.setArray("slow-locks");
historicSamples.stream()
.sorted(Comparator.comparing(LockAttempt::getDuration).reversed())
.forEach(lockAttempt -> setLockAttempt(historicSamplesCursor.addObject(), lockAttempt, true, true));
List<RecordedLockAttempts> historicRecordings = LockStats.getGlobal().getHistoricRecordings().stream()
.sorted(Comparator.comparing(RecordedLockAttempts::duration).reversed())
.toList();
if (!historicRecordings.isEmpty()) {
Cursor recordingsCursor = root.setArray("recordings");
historicRecordings.forEach(recording -> setRecording(recordingsCursor.addObject(), recording));
}
Cursor lockPathsCursor = root.setArray("lock-paths");
lockMetricsByPath.forEach((lockPath, lockMetrics) -> {
Cursor lockPathCursor = lockPathsCursor.addObject();
lockPathCursor.setString("path", lockPath);
setNonZeroLong(lockPathCursor, "acquireCount", lockMetrics.getCumulativeAcquireCount());
setNonZeroLong(lockPathCursor, "acquireFailedCount", lockMetrics.getCumulativeAcquireFailedCount());
setNonZeroLong(lockPathCursor, "acquireTimedOutCount", lockMetrics.getCumulativeAcquireTimedOutCount());
setNonZeroLong(lockPathCursor, "lockedCount", lockMetrics.getCumulativeAcquireSucceededCount());
setNonZeroLong(lockPathCursor, "releaseCount", lockMetrics.getCumulativeReleaseCount());
setNonZeroLong(lockPathCursor, "releaseFailedCount", lockMetrics.getCumulativeReleaseFailedCount());
setNonZeroLong(lockPathCursor, "reentryCount", lockMetrics.getCumulativeReentryCount());
setNonZeroLong(lockPathCursor, "deadlock", lockMetrics.getCumulativeDeadlockCount());
setNonZeroLong(lockPathCursor, "nakedRelease", lockMetrics.getCumulativeNakedReleaseCount());
setNonZeroLong(lockPathCursor, "acquireWithoutRelease", lockMetrics.getCumulativeAcquireWithoutReleaseCount());
setNonZeroLong(lockPathCursor, "foreignRelease", lockMetrics.getCumulativeForeignReleaseCount());
setLatency(lockPathCursor, "acquire", lockMetrics.getAcquireLatencyMetrics());
setLatency(lockPathCursor, "locked", lockMetrics.getLockedLatencyMetrics());
});
}
private static void setNonZeroLong(Cursor cursor, String fieldName, long value) {
if (value != 0) {
cursor.setLong(fieldName, value);
}
}
private static void setLatency(Cursor cursor, String name, LatencyMetrics latencyMetrics) {
setNonZeroDouble(cursor, name + "Latency", latencyMetrics.latencySeconds());
setNonZeroDouble(cursor, name + "MaxActiveLatency", latencyMetrics.maxActiveLatencySeconds());
setNonZeroDouble(cursor, name + "Hz", latencyMetrics.endHz());
setNonZeroDouble(cursor, name + "Load", latencyMetrics.load());
if (latencyMetrics.loadByThread().isEmpty()) return;
Cursor loadByThreadCursor = cursor.setArray(name + "LoadByThread");
latencyMetrics.loadByThread().forEach((threadName, load) -> {
Cursor loadForThreadCursor = loadByThreadCursor.addObject();
loadForThreadCursor.setString("name", threadName);
loadForThreadCursor.setDouble("load", load);
});
}
private static void setNonZeroDouble(Cursor cursor, String fieldName, double value) {
if (Double.compare(value, 0.0) != 0) {
cursor.setDouble(fieldName, value);
}
}
@Override
public void render(OutputStream stream) throws IOException {
new JsonFormat(true).encode(stream, slime);
}
@Override
public String getContentType() {
return "application/json";
}
private void setRecording(Cursor cursor, RecordedLockAttempts recording) {
cursor.setString("record-id", recording.recordId());
cursor.setString("start-time", toString(recording.startInstant()));
cursor.setString("duration", recording.duration().toString());
Cursor locksCursor = cursor.setArray("locks");
recording.lockAttempts().forEach(lockAttempt -> setLockAttempt(locksCursor.addObject(), lockAttempt, false, false));
}
private void setLockAttempt(Cursor lockAttemptCursor, LockAttempt lockAttempt, boolean includeThreadName,
boolean includeStackTrace) {
if (includeThreadName) {
lockAttemptCursor.setString("thread-name", lockAttempt.getThreadName());
}
lockAttemptCursor.setString("lock-path", lockAttempt.getLockPath());
lockAttemptCursor.setString("invoke-acquire-time", toString(lockAttempt.getTimeAcquiredWasInvoked()));
lockAttemptCursor.setString("acquire-timeout", lockAttempt.getAcquireTimeout().toString());
lockAttempt.getTimeLockWasAcquired().ifPresent(instant -> lockAttemptCursor.setString("lock-acquired-time", toString(instant)));
lockAttemptCursor.setString("lock-state", lockAttempt.getLockState().name());
lockAttempt.getTimeTerminalStateWasReached().ifPresent(instant -> lockAttemptCursor.setString("terminal-state-time", toString(instant)));
lockAttemptCursor.setString("acquire-duration", toString(lockAttempt.getDurationOfAcquire()));
lockAttemptCursor.setString("locked-duration", toString(lockAttempt.getDurationWithLock()));
lockAttemptCursor.setString("total-duration", toString(lockAttempt.getDuration()));
if (includeStackTrace) {
lockAttempt.getStackTrace().ifPresent(stackTrace -> lockAttemptCursor.setString("stack-trace", stackTrace));
}
List<LockAttempt> nestedLockAttempts = lockAttempt.getNestedLockAttempts();
if (!nestedLockAttempts.isEmpty()) {
Cursor nestedLockAttemptsCursor = lockAttemptCursor.setArray("nested-locks");
nestedLockAttempts.forEach(nestedLockAttempt ->
setLockAttempt(nestedLockAttemptsCursor.addObject(), nestedLockAttempt, false, includeStackTrace));
}
}
private static String toString(Duration duration) {
return Duration.ofMillis(duration.toMillis()).toString();
}
private static String toString(Instant time) {
return Instant.ofEpochMilli(time.toEpochMilli()).toString();
}
}
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