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| <pre><span class="source-line-no">001</span><span id="line-1">/*</span> |
| <span class="source-line-no">002</span><span id="line-2"> * Licensed to the Apache Software Foundation (ASF) under one</span> |
| <span class="source-line-no">003</span><span id="line-3"> * or more contributor license agreements. See the NOTICE file</span> |
| <span class="source-line-no">004</span><span id="line-4"> * distributed with this work for additional information</span> |
| <span class="source-line-no">005</span><span id="line-5"> * regarding copyright ownership. The ASF licenses this file</span> |
| <span class="source-line-no">006</span><span id="line-6"> * to you under the Apache License, Version 2.0 (the</span> |
| <span class="source-line-no">007</span><span id="line-7"> * "License"); you may not use this file except in compliance</span> |
| <span class="source-line-no">008</span><span id="line-8"> * with the License. You may obtain a copy of the License at</span> |
| <span class="source-line-no">009</span><span id="line-9"> *</span> |
| <span class="source-line-no">010</span><span id="line-10"> * http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="source-line-no">011</span><span id="line-11"> *</span> |
| <span class="source-line-no">012</span><span id="line-12"> * Unless required by applicable law or agreed to in writing, software</span> |
| <span class="source-line-no">013</span><span id="line-13"> * distributed under the License is distributed on an "AS IS" BASIS,</span> |
| <span class="source-line-no">014</span><span id="line-14"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span> |
| <span class="source-line-no">015</span><span id="line-15"> * See the License for the specific language governing permissions and</span> |
| <span class="source-line-no">016</span><span id="line-16"> * limitations under the License.</span> |
| <span class="source-line-no">017</span><span id="line-17"> */</span> |
| <span class="source-line-no">018</span><span id="line-18">package org.apache.hadoop.hbase;</span> |
| <span class="source-line-no">019</span><span id="line-19"></span> |
| <span class="source-line-no">020</span><span id="line-20">import java.util.concurrent.Callable;</span> |
| <span class="source-line-no">021</span><span id="line-21">import java.util.concurrent.Delayed;</span> |
| <span class="source-line-no">022</span><span id="line-22">import java.util.concurrent.ExecutionException;</span> |
| <span class="source-line-no">023</span><span id="line-23">import java.util.concurrent.RunnableScheduledFuture;</span> |
| <span class="source-line-no">024</span><span id="line-24">import java.util.concurrent.ScheduledThreadPoolExecutor;</span> |
| <span class="source-line-no">025</span><span id="line-25">import java.util.concurrent.ThreadFactory;</span> |
| <span class="source-line-no">026</span><span id="line-26">import java.util.concurrent.ThreadLocalRandom;</span> |
| <span class="source-line-no">027</span><span id="line-27">import java.util.concurrent.TimeUnit;</span> |
| <span class="source-line-no">028</span><span id="line-28">import java.util.concurrent.TimeoutException;</span> |
| <span class="source-line-no">029</span><span id="line-29">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">030</span><span id="line-30"></span> |
| <span class="source-line-no">031</span><span id="line-31">/**</span> |
| <span class="source-line-no">032</span><span id="line-32"> * ScheduledThreadPoolExecutor that will add some jitter to the RunnableScheduledFuture.getDelay.</span> |
| <span class="source-line-no">033</span><span id="line-33"> * This will spread out things on a distributed cluster.</span> |
| <span class="source-line-no">034</span><span id="line-34"> */</span> |
| <span class="source-line-no">035</span><span id="line-35">@InterfaceAudience.Private</span> |
| <span class="source-line-no">036</span><span id="line-36">public class JitterScheduledThreadPoolExecutorImpl extends ScheduledThreadPoolExecutor {</span> |
| <span class="source-line-no">037</span><span id="line-37"> private final double spread;</span> |
| <span class="source-line-no">038</span><span id="line-38"></span> |
| <span class="source-line-no">039</span><span id="line-39"> /**</span> |
| <span class="source-line-no">040</span><span id="line-40"> * Main constructor.</span> |
| <span class="source-line-no">041</span><span id="line-41"> * @param spread The percent up and down that RunnableScheduledFuture.getDelay should be jittered.</span> |
| <span class="source-line-no">042</span><span id="line-42"> */</span> |
| <span class="source-line-no">043</span><span id="line-43"> public JitterScheduledThreadPoolExecutorImpl(int corePoolSize, ThreadFactory threadFactory,</span> |
| <span class="source-line-no">044</span><span id="line-44"> double spread) {</span> |
| <span class="source-line-no">045</span><span id="line-45"> super(corePoolSize, threadFactory);</span> |
| <span class="source-line-no">046</span><span id="line-46"> this.spread = spread;</span> |
| <span class="source-line-no">047</span><span id="line-47"> }</span> |
| <span class="source-line-no">048</span><span id="line-48"></span> |
| <span class="source-line-no">049</span><span id="line-49"> @Override</span> |
| <span class="source-line-no">050</span><span id="line-50"> protected <V> java.util.concurrent.RunnableScheduledFuture<V> decorateTask(Runnable runnable,</span> |
| <span class="source-line-no">051</span><span id="line-51"> java.util.concurrent.RunnableScheduledFuture<V> task) {</span> |
| <span class="source-line-no">052</span><span id="line-52"> return new JitteredRunnableScheduledFuture<>(task);</span> |
| <span class="source-line-no">053</span><span id="line-53"> }</span> |
| <span class="source-line-no">054</span><span id="line-54"></span> |
| <span class="source-line-no">055</span><span id="line-55"> @Override</span> |
| <span class="source-line-no">056</span><span id="line-56"> protected <V> java.util.concurrent.RunnableScheduledFuture<V> decorateTask(Callable<V> callable,</span> |
| <span class="source-line-no">057</span><span id="line-57"> java.util.concurrent.RunnableScheduledFuture<V> task) {</span> |
| <span class="source-line-no">058</span><span id="line-58"> return new JitteredRunnableScheduledFuture<>(task);</span> |
| <span class="source-line-no">059</span><span id="line-59"> }</span> |
| <span class="source-line-no">060</span><span id="line-60"></span> |
| <span class="source-line-no">061</span><span id="line-61"> /**</span> |
| <span class="source-line-no">062</span><span id="line-62"> * Class that basically just defers to the wrapped future. The only exception is getDelay</span> |
| <span class="source-line-no">063</span><span id="line-63"> */</span> |
| <span class="source-line-no">064</span><span id="line-64"> protected class JitteredRunnableScheduledFuture<V> implements RunnableScheduledFuture<V> {</span> |
| <span class="source-line-no">065</span><span id="line-65"> private final RunnableScheduledFuture<V> wrapped;</span> |
| <span class="source-line-no">066</span><span id="line-66"></span> |
| <span class="source-line-no">067</span><span id="line-67"> JitteredRunnableScheduledFuture(RunnableScheduledFuture<V> wrapped) {</span> |
| <span class="source-line-no">068</span><span id="line-68"> this.wrapped = wrapped;</span> |
| <span class="source-line-no">069</span><span id="line-69"> }</span> |
| <span class="source-line-no">070</span><span id="line-70"></span> |
| <span class="source-line-no">071</span><span id="line-71"> @Override</span> |
| <span class="source-line-no">072</span><span id="line-72"> public boolean isPeriodic() {</span> |
| <span class="source-line-no">073</span><span id="line-73"> return wrapped.isPeriodic();</span> |
| <span class="source-line-no">074</span><span id="line-74"> }</span> |
| <span class="source-line-no">075</span><span id="line-75"></span> |
| <span class="source-line-no">076</span><span id="line-76"> @Override</span> |
| <span class="source-line-no">077</span><span id="line-77"> public long getDelay(TimeUnit unit) {</span> |
| <span class="source-line-no">078</span><span id="line-78"> long baseDelay = wrapped.getDelay(unit);</span> |
| <span class="source-line-no">079</span><span id="line-79"> long spreadTime = (long) (baseDelay * spread);</span> |
| <span class="source-line-no">080</span><span id="line-80"> long delay = spreadTime <= 0</span> |
| <span class="source-line-no">081</span><span id="line-81"> ? baseDelay</span> |
| <span class="source-line-no">082</span><span id="line-82"> : baseDelay + ThreadLocalRandom.current().nextLong(-spreadTime, spreadTime);</span> |
| <span class="source-line-no">083</span><span id="line-83"> // Ensure that we don't roll over for nanoseconds.</span> |
| <span class="source-line-no">084</span><span id="line-84"> return (delay < 0) ? baseDelay : delay;</span> |
| <span class="source-line-no">085</span><span id="line-85"> }</span> |
| <span class="source-line-no">086</span><span id="line-86"></span> |
| <span class="source-line-no">087</span><span id="line-87"> @Override</span> |
| <span class="source-line-no">088</span><span id="line-88"> public int compareTo(Delayed o) {</span> |
| <span class="source-line-no">089</span><span id="line-89"> return wrapped.compareTo(o);</span> |
| <span class="source-line-no">090</span><span id="line-90"> }</span> |
| <span class="source-line-no">091</span><span id="line-91"></span> |
| <span class="source-line-no">092</span><span id="line-92"> @Override</span> |
| <span class="source-line-no">093</span><span id="line-93"> public boolean equals(Object obj) {</span> |
| <span class="source-line-no">094</span><span id="line-94"> if (obj == this) {</span> |
| <span class="source-line-no">095</span><span id="line-95"> return true;</span> |
| <span class="source-line-no">096</span><span id="line-96"> }</span> |
| <span class="source-line-no">097</span><span id="line-97"> return obj instanceof Delayed ? compareTo((Delayed) obj) == 0 : false;</span> |
| <span class="source-line-no">098</span><span id="line-98"> }</span> |
| <span class="source-line-no">099</span><span id="line-99"></span> |
| <span class="source-line-no">100</span><span id="line-100"> @Override</span> |
| <span class="source-line-no">101</span><span id="line-101"> public int hashCode() {</span> |
| <span class="source-line-no">102</span><span id="line-102"> return this.wrapped.hashCode();</span> |
| <span class="source-line-no">103</span><span id="line-103"> }</span> |
| <span class="source-line-no">104</span><span id="line-104"></span> |
| <span class="source-line-no">105</span><span id="line-105"> @Override</span> |
| <span class="source-line-no">106</span><span id="line-106"> public void run() {</span> |
| <span class="source-line-no">107</span><span id="line-107"> wrapped.run();</span> |
| <span class="source-line-no">108</span><span id="line-108"> }</span> |
| <span class="source-line-no">109</span><span id="line-109"></span> |
| <span class="source-line-no">110</span><span id="line-110"> @Override</span> |
| <span class="source-line-no">111</span><span id="line-111"> public boolean cancel(boolean mayInterruptIfRunning) {</span> |
| <span class="source-line-no">112</span><span id="line-112"> return wrapped.cancel(mayInterruptIfRunning);</span> |
| <span class="source-line-no">113</span><span id="line-113"> }</span> |
| <span class="source-line-no">114</span><span id="line-114"></span> |
| <span class="source-line-no">115</span><span id="line-115"> @Override</span> |
| <span class="source-line-no">116</span><span id="line-116"> public boolean isCancelled() {</span> |
| <span class="source-line-no">117</span><span id="line-117"> return wrapped.isCancelled();</span> |
| <span class="source-line-no">118</span><span id="line-118"> }</span> |
| <span class="source-line-no">119</span><span id="line-119"></span> |
| <span class="source-line-no">120</span><span id="line-120"> @Override</span> |
| <span class="source-line-no">121</span><span id="line-121"> public boolean isDone() {</span> |
| <span class="source-line-no">122</span><span id="line-122"> return wrapped.isDone();</span> |
| <span class="source-line-no">123</span><span id="line-123"> }</span> |
| <span class="source-line-no">124</span><span id="line-124"></span> |
| <span class="source-line-no">125</span><span id="line-125"> @Override</span> |
| <span class="source-line-no">126</span><span id="line-126"> public V get() throws InterruptedException, ExecutionException {</span> |
| <span class="source-line-no">127</span><span id="line-127"> return wrapped.get();</span> |
| <span class="source-line-no">128</span><span id="line-128"> }</span> |
| <span class="source-line-no">129</span><span id="line-129"></span> |
| <span class="source-line-no">130</span><span id="line-130"> @Override</span> |
| <span class="source-line-no">131</span><span id="line-131"> public V get(long timeout, TimeUnit unit)</span> |
| <span class="source-line-no">132</span><span id="line-132"> throws InterruptedException, ExecutionException, TimeoutException {</span> |
| <span class="source-line-no">133</span><span id="line-133"> return wrapped.get(timeout, unit);</span> |
| <span class="source-line-no">134</span><span id="line-134"> }</span> |
| <span class="source-line-no">135</span><span id="line-135"> }</span> |
| <span class="source-line-no">136</span><span id="line-136">}</span> |
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| </pre> |
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