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Apache ZooKeeper Server Source Code
Apache ZooKeeper is an open-source server which enables highly reliable distributed coordination.
Apache ZooKeeper Server Source Code files are provided in the source package file, apache-zookeeper-3.8.0.tar.gz.
You can download apache-zookeeper-3.8.0.tar.gz as described in the previous tutorial and go to the "zookeeper-server" sub-folder to view Apache ZooKeeper Server Source Code files.
You can also browse Apache ZooKeeper Server Source Code below:
✍: FYIcenter.com
⏎ org/apache/zookeeper/server/metric/AvgMinMaxPercentileCounter.java
/* * 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.zookeeper.server.metric; import com.codahale.metrics.Histogram; import com.codahale.metrics.Reservoir; import com.codahale.metrics.Snapshot; import com.codahale.metrics.UniformSnapshot; import java.util.ArrayList; import java.util.LinkedHashMap; import java.util.List; import java.util.Map; import java.util.concurrent.ThreadLocalRandom; import java.util.concurrent.atomic.AtomicLong; import java.util.concurrent.atomic.AtomicLongArray; import org.apache.zookeeper.metrics.Summary; /** * Generic long counter that keep track of min/max/avg/percentiles. * The counter is thread-safe */ public class AvgMinMaxPercentileCounter extends Metric implements Summary { private final String name; private final AvgMinMaxCounter counter; private final ResettableUniformReservoir reservoir; private final Histogram histogram; static class ResettableUniformReservoir implements Reservoir { private static final int DEFAULT_SIZE = 4096; private static final int BITS_PER_LONG = 63; private final AtomicLong count = new AtomicLong(); private volatile AtomicLongArray values = new AtomicLongArray(DEFAULT_SIZE); @Override public int size() { final long c = count.get(); if (c > values.length()) { return values.length(); } return (int) c; } @Override public void update(long value) { final long c = count.incrementAndGet(); if (c <= values.length()) { values.set((int) c - 1, value); } else { final long r = nextLong(c); if (r < values.length()) { values.set((int) r, value); } } } private static long nextLong(long n) { long bits, val; do { bits = ThreadLocalRandom.current().nextLong() & (~(1L << BITS_PER_LONG)); val = bits % n; } while (bits - val + (n - 1) < 0L); return val; } @Override public Snapshot getSnapshot() { final int s = size(); final List<Long> copy = new ArrayList<Long>(s); for (int i = 0; i < s; i++) { copy.add(values.get(i)); } return new UniformSnapshot(copy); } public void reset() { count.set(0); values = new AtomicLongArray(DEFAULT_SIZE); } } public AvgMinMaxPercentileCounter(String name) { this.name = name; this.counter = new AvgMinMaxCounter(this.name); reservoir = new ResettableUniformReservoir(); histogram = new Histogram(reservoir); } public void addDataPoint(long value) { counter.add(value); histogram.update(value); } public void resetMax() { // To match existing behavior in upstream counter.resetMax(); } public void reset() { counter.reset(); reservoir.reset(); } public void add(long value) { addDataPoint(value); } public Map<String, Object> values() { Map<String, Object> m = new LinkedHashMap<>(); m.putAll(counter.values()); m.put("p50_" + name, Math.round(this.histogram.getSnapshot().getMedian())); m.put("p95_" + name, Math.round(this.histogram.getSnapshot().get95thPercentile())); m.put("p99_" + name, Math.round(this.histogram.getSnapshot().get99thPercentile())); m.put("p999_" + name, Math.round(this.histogram.getSnapshot().get999thPercentile())); return m; } }
⏎ org/apache/zookeeper/server/metric/AvgMinMaxPercentileCounter.java
Or download all of them as a single archive file:
File name: zookeeper-server-3.8.0-fyi.zip File size: 885581 bytes Release date: 2022-02-25 Download
⇒ Apache ZooKeeper Jute Source Code
⇐ Download and Install Apache ZooKeeper Source Package
2022-11-16, 13611👍, 0💬
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