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DataSketchesOpStatsLogger.java
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DataSketchesOpStatsLogger.java
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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.pulsar.broker.stats.prometheus.metrics;
import com.yahoo.sketches.quantiles.DoublesSketch;
import com.yahoo.sketches.quantiles.DoublesSketchBuilder;
import com.yahoo.sketches.quantiles.DoublesUnion;
import com.yahoo.sketches.quantiles.DoublesUnionBuilder;
import io.netty.util.concurrent.FastThreadLocal;
import org.apache.bookkeeper.stats.OpStatsData;
import org.apache.bookkeeper.stats.OpStatsLogger;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.LongAdder;
import java.util.concurrent.locks.StampedLock;
/**
* OpStatsLogger implementation that uses DataSketches library to calculate the approximated latency quantiles.
*/
public class DataSketchesOpStatsLogger implements OpStatsLogger {
/**
* Use 2 rotating thread local accessor so that we can safely swap them.
*/
private volatile ThreadLocalAccessor current;
private volatile ThreadLocalAccessor replacement;
/**
* These are the sketches where all the aggregated results are published.
*/
private volatile DoublesSketch successResult;
private volatile DoublesSketch failResult;
private final LongAdder successCountAdder = new LongAdder();
private final LongAdder failCountAdder = new LongAdder();
private final LongAdder successSumAdder = new LongAdder();
private final LongAdder failSumAdder = new LongAdder();
public DataSketchesOpStatsLogger() {
this.current = new ThreadLocalAccessor();
this.replacement = new ThreadLocalAccessor();
}
@Override
public void registerFailedEvent(long eventLatency, TimeUnit unit) {
double valueMillis = unit.toMicros(eventLatency) / 1000.0;
failCountAdder.increment();
failSumAdder.add((long) valueMillis);
LocalData localData = current.localData.get();
long stamp = localData.lock.readLock();
try {
localData.failSketch.update(valueMillis);
} finally {
localData.lock.unlockRead(stamp);
}
}
@Override
public void registerSuccessfulEvent(long eventLatency, TimeUnit unit) {
double valueMillis = unit.toMicros(eventLatency) / 1000.0;
successCountAdder.increment();
successSumAdder.add((long) valueMillis);
LocalData localData = current.localData.get();
long stamp = localData.lock.readLock();
try {
localData.successSketch.update(valueMillis);
} finally {
localData.lock.unlockRead(stamp);
}
}
@Override
public void registerSuccessfulValue(long value) {
successCountAdder.increment();
successSumAdder.add(value);
LocalData localData = current.localData.get();
long stamp = localData.lock.readLock();
try {
localData.successSketch.update(value);
} finally {
localData.lock.unlockRead(stamp);
}
}
@Override
public void registerFailedValue(long value) {
failCountAdder.increment();
failSumAdder.add(value);
LocalData localData = current.localData.get();
long stamp = localData.lock.readLock();
try {
localData.failSketch.update(value);
} finally {
localData.lock.unlockRead(stamp);
}
}
@Override
public OpStatsData toOpStatsData() {
// Not relevant as we don't use JMX here
throw new UnsupportedOperationException();
}
@Override
public void clear() {
// Not relevant as we don't use JMX here
throw new UnsupportedOperationException();
}
public void rotateLatencyCollection() {
// Swap current with replacement
ThreadLocalAccessor local = current;
current = replacement;
replacement = local;
final DoublesUnion aggregateSuccesss = new DoublesUnionBuilder().build();
final DoublesUnion aggregateFail = new DoublesUnionBuilder().build();
local.map.forEach((localData, b) -> {
long stamp = localData.lock.writeLock();
try {
aggregateSuccesss.update(localData.successSketch);
localData.successSketch.reset();
aggregateFail.update(localData.failSketch);
localData.failSketch.reset();
} finally {
localData.lock.unlockWrite(stamp);
}
});
successResult = aggregateSuccesss.getResultAndReset();
failResult = aggregateFail.getResultAndReset();
}
public long getCount(boolean success) {
return success ? successCountAdder.sum() : failCountAdder.sum();
}
public long getSum(boolean success) {
return success ? successSumAdder.sum() : failSumAdder.sum();
}
public double getQuantileValue(boolean success, double quantile) {
DoublesSketch s = success ? successResult : failResult;
return s != null ? s.getQuantile(quantile) : Double.NaN;
}
private static class LocalData {
private final DoublesSketch successSketch = new DoublesSketchBuilder().build();
private final DoublesSketch failSketch = new DoublesSketchBuilder().build();
private final StampedLock lock = new StampedLock();
}
private static class ThreadLocalAccessor {
private final Map<LocalData, Boolean> map = new ConcurrentHashMap<>();
private final FastThreadLocal<LocalData> localData = new FastThreadLocal<LocalData>() {
@Override
protected LocalData initialValue() throws Exception {
LocalData localData = new LocalData();
map.put(localData, Boolean.TRUE);
return localData;
}
@Override
protected void onRemoval(LocalData value) throws Exception {
map.remove(value);
}
};
}
}