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.
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Lee Hinman
GitHub
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/*
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* Licensed to Elasticsearch under one or more contributor
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* license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright
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* ownership. Elasticsearch licenses this file to you under
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* the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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package org.elasticsearch.common.metrics;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.atomic.LongAdder;
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/**
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* An exponentially-weighted moving average.
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*
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* <p>
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* Taken from codahale metric module, changed to use LongAdder
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*
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* @see <a href="http://www.teamquest.com/pdfs/whitepaper/ldavg1.pdf">UNIX Load Average Part 1: How It Works</a>
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* @see <a href="http://www.teamquest.com/pdfs/whitepaper/ldavg2.pdf">UNIX Load Average Part 2: Not Your Average Average</a>
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*/
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public class EWMA {
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private static final double M1_ALPHA = 1 - Math.exp(-5 / 60.0);
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private static final double M5_ALPHA = 1 - Math.exp(-5 / 60.0 / 5);
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private static final double M15_ALPHA = 1 - Math.exp(-5 / 60.0 / 15);
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private volatile boolean initialized = false;
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private volatile double rate = 0.0;
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private final LongAdder uncounted = new LongAdder();
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private final double alpha, interval;
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/**
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* Creates a new EWMA which is equivalent to the UNIX one minute load average and which expects to be ticked every
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* 5 seconds.
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*
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* @return a one-minute EWMA
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*/
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public static EWMA oneMinuteEWMA() {
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return new EWMA(M1_ALPHA, 5, TimeUnit.SECONDS);
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}
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/**
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* Creates a new EWMA which is equivalent to the UNIX five minute load average and which expects to be ticked every
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* 5 seconds.
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*
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* @return a five-minute EWMA
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*/
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public static EWMA fiveMinuteEWMA() {
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return new EWMA(M5_ALPHA, 5, TimeUnit.SECONDS);
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}
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/**
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* Creates a new EWMA which is equivalent to the UNIX fifteen minute load average and which expects to be ticked
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* every 5 seconds.
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*
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* @return a fifteen-minute EWMA
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*/
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public static EWMA fifteenMinuteEWMA() {
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return new EWMA(M15_ALPHA, 5, TimeUnit.SECONDS);
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}
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/**
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* Create a new EWMA with a specific smoothing constant.
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*
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* @param alpha the smoothing constant
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* @param interval the expected tick interval
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* @param intervalUnit the time unit of the tick interval
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*/
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public EWMA(double alpha, long interval, TimeUnit intervalUnit) {
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this.interval = intervalUnit.toNanos(interval);
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this.alpha = alpha;
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}
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/**
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* Update the moving average with a new value.
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*
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* @param n the new value
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*/
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public void update(long n) {
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uncounted.add(n);
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}
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/**
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* Mark the passage of time and decay the current rate accordingly.
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*/
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public void tick() {
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final long count = uncounted.sumThenReset();
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double instantRate = count / interval;
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if (initialized) {
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rate += (alpha * (instantRate - rate));
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} else {
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rate = instantRate;
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initialized = true;
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}
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}
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/**
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* Returns the rate in the given units of time.
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*
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* @param rateUnit the unit of time
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* @return the rate
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*/
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public double rate(TimeUnit rateUnit) {
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return rate * (double) rateUnit.toNanos(1);
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}
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}
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@ -1,123 +0,0 @@
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/*
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* Licensed to Elasticsearch under one or more contributor
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* license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright
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* ownership. Elasticsearch licenses this file to you under
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* the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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package org.elasticsearch.common.metrics;
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import org.elasticsearch.common.util.concurrent.FutureUtils;
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import java.util.concurrent.ScheduledExecutorService;
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import java.util.concurrent.ScheduledFuture;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.atomic.LongAdder;
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/**
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* A meter metric which measures mean throughput and one-, five-, and
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* fifteen-minute exponentially-weighted moving average throughputs.
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*
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* <p>
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* taken from codahale metric module, replaced with LongAdder
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*
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* @see <a href="http://en.wikipedia.org/wiki/Moving_average#Exponential_moving_average">EMA</a>
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*/
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public class MeterMetric implements Metric {
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private static final long INTERVAL = 5; // seconds
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private final EWMA m1Rate = EWMA.oneMinuteEWMA();
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private final EWMA m5Rate = EWMA.fiveMinuteEWMA();
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private final EWMA m15Rate = EWMA.fifteenMinuteEWMA();
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private final LongAdder count = new LongAdder();
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private final long startTime = System.nanoTime();
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private final TimeUnit rateUnit;
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private final ScheduledFuture<?> future;
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public MeterMetric(ScheduledExecutorService tickThread, TimeUnit rateUnit) {
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this.rateUnit = rateUnit;
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this.future = tickThread.scheduleAtFixedRate(new Runnable() {
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@Override
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public void run() {
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tick();
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}
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}, INTERVAL, INTERVAL, TimeUnit.SECONDS);
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}
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public TimeUnit rateUnit() {
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return rateUnit;
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}
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/**
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* Updates the moving averages.
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*/
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void tick() {
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m1Rate.tick();
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m5Rate.tick();
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m15Rate.tick();
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}
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/**
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* Mark the occurrence of an event.
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*/
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public void mark() {
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mark(1);
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}
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/**
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* Mark the occurrence of a given number of events.
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*
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* @param n the number of events
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*/
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public void mark(long n) {
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count.add(n);
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m1Rate.update(n);
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m5Rate.update(n);
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m15Rate.update(n);
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}
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public long count() {
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return count.sum();
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}
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public double fifteenMinuteRate() {
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return m15Rate.rate(rateUnit);
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}
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public double fiveMinuteRate() {
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return m5Rate.rate(rateUnit);
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}
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public double meanRate() {
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long count = count();
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if (count == 0) {
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return 0.0;
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} else {
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final long elapsed = (System.nanoTime() - startTime);
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return convertNsRate(count / (double) elapsed);
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}
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}
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public double oneMinuteRate() {
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return m1Rate.rate(rateUnit);
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}
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private double convertNsRate(double ratePerNs) {
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return ratePerNs * (double) rateUnit.toNanos(1);
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}
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public void stop() { FutureUtils.cancel(future);}
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}
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