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Remove unused MeterMetric and specialized EWMA (#24975) 

This metric is not used in the ES codebase at all. It's also not as likely to be
used since it relies on a periodic "tick", which we don't currently use.
This commit is contained in:
Lee Hinman 2017-05-31 09:05:22 -06:00 committed by GitHub
parent ec64c2c05f
commit 9d6cb4cb6d
2 changed files with 0 additions and 242 deletions
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119
core/src/main/java/org/elasticsearch/common/metrics/EWMA.java
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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.common.metrics;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.LongAdder;
/**
* An exponentially-weighted moving average.
*
* <p>
* Taken from codahale metric module, changed to use LongAdder
*
* @see <a href="http://www.teamquest.com/pdfs/whitepaper/ldavg1.pdf">UNIX Load Average Part 1: How It Works</a>
* @see <a href="http://www.teamquest.com/pdfs/whitepaper/ldavg2.pdf">UNIX Load Average Part 2: Not Your Average Average</a>
*/
public class EWMA {
private static final double M1_ALPHA = 1 - Math.exp(-5 / 60.0);
private static final double M5_ALPHA = 1 - Math.exp(-5 / 60.0 / 5);
private static final double M15_ALPHA = 1 - Math.exp(-5 / 60.0 / 15);
private volatile boolean initialized = false;
private volatile double rate = 0.0;
private final LongAdder uncounted = new LongAdder();
private final double alpha, interval;
/**
* Creates a new EWMA which is equivalent to the UNIX one minute load average and which expects to be ticked every
* 5 seconds.
*
* @return a one-minute EWMA
*/
public static EWMA oneMinuteEWMA() {
return new EWMA(M1_ALPHA, 5, TimeUnit.SECONDS);
}
/**
* Creates a new EWMA which is equivalent to the UNIX five minute load average and which expects to be ticked every
* 5 seconds.
*
* @return a five-minute EWMA
*/
public static EWMA fiveMinuteEWMA() {
return new EWMA(M5_ALPHA, 5, TimeUnit.SECONDS);
}
/**
* Creates a new EWMA which is equivalent to the UNIX fifteen minute load average and which expects to be ticked
* every 5 seconds.
*
* @return a fifteen-minute EWMA
*/
public static EWMA fifteenMinuteEWMA() {
return new EWMA(M15_ALPHA, 5, TimeUnit.SECONDS);
}
/**
* Create a new EWMA with a specific smoothing constant.
*
* @param alpha the smoothing constant
* @param interval the expected tick interval
* @param intervalUnit the time unit of the tick interval
*/
public EWMA(double alpha, long interval, TimeUnit intervalUnit) {
this.interval = intervalUnit.toNanos(interval);
this.alpha = alpha;
}
/**
* Update the moving average with a new value.
*
* @param n the new value
*/
public void update(long n) {
uncounted.add(n);
}
/**
* Mark the passage of time and decay the current rate accordingly.
*/
public void tick() {
final long count = uncounted.sumThenReset();
double instantRate = count / interval;
if (initialized) {
rate += (alpha * (instantRate - rate));
} else {
rate = instantRate;
initialized = true;
}
}
/**
* Returns the rate in the given units of time.
*
* @param rateUnit the unit of time
* @return the rate
*/
public double rate(TimeUnit rateUnit) {
return rate * (double) rateUnit.toNanos(1);
}
}

123
core/src/main/java/org/elasticsearch/common/metrics/MeterMetric.java
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@ -1,123 +0,0 @@
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.common.metrics;
import org.elasticsearch.common.util.concurrent.FutureUtils;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.LongAdder;
/**
* A meter metric which measures mean throughput and one-, five-, and
* fifteen-minute exponentially-weighted moving average throughputs.
*
* <p>
* taken from codahale metric module, replaced with LongAdder
*
* @see <a href="http://en.wikipedia.org/wiki/Moving_average#Exponential_moving_average">EMA</a>
*/
public class MeterMetric implements Metric {
private static final long INTERVAL = 5; // seconds
private final EWMA m1Rate = EWMA.oneMinuteEWMA();
private final EWMA m5Rate = EWMA.fiveMinuteEWMA();
private final EWMA m15Rate = EWMA.fifteenMinuteEWMA();
private final LongAdder count = new LongAdder();
private final long startTime = System.nanoTime();
private final TimeUnit rateUnit;
private final ScheduledFuture<?> future;
public MeterMetric(ScheduledExecutorService tickThread, TimeUnit rateUnit) {
this.rateUnit = rateUnit;
this.future = tickThread.scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
tick();
}
}, INTERVAL, INTERVAL, TimeUnit.SECONDS);
}
public TimeUnit rateUnit() {
return rateUnit;
}
/**
* Updates the moving averages.
*/
void tick() {
m1Rate.tick();
m5Rate.tick();
m15Rate.tick();
}
/**
* Mark the occurrence of an event.
*/
public void mark() {
mark(1);
}
/**
* Mark the occurrence of a given number of events.
*
* @param n the number of events
*/
public void mark(long n) {
count.add(n);
m1Rate.update(n);
m5Rate.update(n);
m15Rate.update(n);
}
public long count() {
return count.sum();
}
public double fifteenMinuteRate() {
return m15Rate.rate(rateUnit);
}
public double fiveMinuteRate() {
return m5Rate.rate(rateUnit);
}
public double meanRate() {
long count = count();
if (count == 0) {
return 0.0;
} else {
final long elapsed = (System.nanoTime() - startTime);
return convertNsRate(count / (double) elapsed);
}
}
public double oneMinuteRate() {
return m1Rate.rate(rateUnit);
}
private double convertNsRate(double ratePerNs) {
return ratePerNs * (double) rateUnit.toNanos(1);
}
public void stop() { FutureUtils.cancel(future);}
}