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| <pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a> |
| <span class="sourceLineNo">002</span> *<a name="line.2"></a> |
| <span class="sourceLineNo">003</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.3"></a> |
| <span class="sourceLineNo">004</span> * or more contributor license agreements. See the NOTICE file<a name="line.4"></a> |
| <span class="sourceLineNo">005</span> * distributed with this work for additional information<a name="line.5"></a> |
| <span class="sourceLineNo">006</span> * regarding copyright ownership. The ASF licenses this file<a name="line.6"></a> |
| <span class="sourceLineNo">007</span> * to you under the Apache License, Version 2.0 (the<a name="line.7"></a> |
| <span class="sourceLineNo">008</span> * "License"); you may not use this file except in compliance<a name="line.8"></a> |
| <span class="sourceLineNo">009</span> * with the License. You may obtain a copy of the License at<a name="line.9"></a> |
| <span class="sourceLineNo">010</span> *<a name="line.10"></a> |
| <span class="sourceLineNo">011</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.11"></a> |
| <span class="sourceLineNo">012</span> *<a name="line.12"></a> |
| <span class="sourceLineNo">013</span> * Unless required by applicable law or agreed to in writing, software<a name="line.13"></a> |
| <span class="sourceLineNo">014</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> * See the License for the specific language governing permissions and<a name="line.16"></a> |
| <span class="sourceLineNo">017</span> * limitations under the License.<a name="line.17"></a> |
| <span class="sourceLineNo">018</span> */<a name="line.18"></a> |
| <span class="sourceLineNo">019</span><a name="line.19"></a> |
| <span class="sourceLineNo">020</span>package org.apache.hadoop.hbase;<a name="line.20"></a> |
| <span class="sourceLineNo">021</span><a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import java.util.concurrent.Callable;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import java.util.concurrent.Delayed;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import java.util.concurrent.ExecutionException;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import java.util.concurrent.RunnableScheduledFuture;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import java.util.concurrent.ScheduledThreadPoolExecutor;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>import java.util.concurrent.ThreadFactory;<a name="line.27"></a> |
| <span class="sourceLineNo">028</span>import java.util.concurrent.ThreadLocalRandom;<a name="line.28"></a> |
| <span class="sourceLineNo">029</span>import java.util.concurrent.TimeUnit;<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>import java.util.concurrent.TimeoutException;<a name="line.30"></a> |
| <span class="sourceLineNo">031</span><a name="line.31"></a> |
| <span class="sourceLineNo">032</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.32"></a> |
| <span class="sourceLineNo">033</span><a name="line.33"></a> |
| <span class="sourceLineNo">034</span>/**<a name="line.34"></a> |
| <span class="sourceLineNo">035</span> * ScheduledThreadPoolExecutor that will add some jitter to the RunnableScheduledFuture.getDelay.<a name="line.35"></a> |
| <span class="sourceLineNo">036</span> *<a name="line.36"></a> |
| <span class="sourceLineNo">037</span> * This will spread out things on a distributed cluster.<a name="line.37"></a> |
| <span class="sourceLineNo">038</span> */<a name="line.38"></a> |
| <span class="sourceLineNo">039</span>@InterfaceAudience.Private<a name="line.39"></a> |
| <span class="sourceLineNo">040</span>public class JitterScheduledThreadPoolExecutorImpl extends ScheduledThreadPoolExecutor {<a name="line.40"></a> |
| <span class="sourceLineNo">041</span> private final double spread;<a name="line.41"></a> |
| <span class="sourceLineNo">042</span><a name="line.42"></a> |
| <span class="sourceLineNo">043</span> /**<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> * Main constructor.<a name="line.44"></a> |
| <span class="sourceLineNo">045</span> * @param spread The percent up and down that RunnableScheduledFuture.getDelay should be jittered.<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> */<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> public JitterScheduledThreadPoolExecutorImpl(int corePoolSize,<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> ThreadFactory threadFactory,<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> double spread) {<a name="line.49"></a> |
| <span class="sourceLineNo">050</span> super(corePoolSize, threadFactory);<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> this.spread = spread;<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> }<a name="line.52"></a> |
| <span class="sourceLineNo">053</span><a name="line.53"></a> |
| <span class="sourceLineNo">054</span> @Override<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> protected <V> java.util.concurrent.RunnableScheduledFuture<V> decorateTask(<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> Runnable runnable, java.util.concurrent.RunnableScheduledFuture<V> task) {<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> return new JitteredRunnableScheduledFuture<>(task);<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> }<a name="line.58"></a> |
| <span class="sourceLineNo">059</span><a name="line.59"></a> |
| <span class="sourceLineNo">060</span> @Override<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> protected <V> java.util.concurrent.RunnableScheduledFuture<V> decorateTask(<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> Callable<V> callable, java.util.concurrent.RunnableScheduledFuture<V> task) {<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> return new JitteredRunnableScheduledFuture<>(task);<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> }<a name="line.64"></a> |
| <span class="sourceLineNo">065</span><a name="line.65"></a> |
| <span class="sourceLineNo">066</span> /**<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> * Class that basically just defers to the wrapped future.<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> * The only exception is getDelay<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> */<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> protected class JitteredRunnableScheduledFuture<V> implements RunnableScheduledFuture<V> {<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> private final RunnableScheduledFuture<V> wrapped;<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> JitteredRunnableScheduledFuture(RunnableScheduledFuture<V> wrapped) {<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> this.wrapped = wrapped;<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> }<a name="line.74"></a> |
| <span class="sourceLineNo">075</span><a name="line.75"></a> |
| <span class="sourceLineNo">076</span> @Override<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> public boolean isPeriodic() {<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> return wrapped.isPeriodic();<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> }<a name="line.79"></a> |
| <span class="sourceLineNo">080</span><a name="line.80"></a> |
| <span class="sourceLineNo">081</span> @Override<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> public long getDelay(TimeUnit unit) {<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> long baseDelay = wrapped.getDelay(unit);<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> long spreadTime = (long) (baseDelay * spread);<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> long delay = spreadTime <= 0 ? baseDelay<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> : baseDelay + ThreadLocalRandom.current().nextLong(-spreadTime, spreadTime);<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> // Ensure that we don't roll over for nanoseconds.<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> return (delay < 0) ? baseDelay : delay;<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> }<a name="line.89"></a> |
| <span class="sourceLineNo">090</span><a name="line.90"></a> |
| <span class="sourceLineNo">091</span> @Override<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> public int compareTo(Delayed o) {<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> return wrapped.compareTo(o);<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> }<a name="line.94"></a> |
| <span class="sourceLineNo">095</span><a name="line.95"></a> |
| <span class="sourceLineNo">096</span> @Override<a name="line.96"></a> |
| <span class="sourceLineNo">097</span> public boolean equals(Object obj) {<a name="line.97"></a> |
| <span class="sourceLineNo">098</span> if (obj == this) {<a name="line.98"></a> |
| <span class="sourceLineNo">099</span> return true;<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> }<a name="line.100"></a> |
| <span class="sourceLineNo">101</span> return obj instanceof Delayed? compareTo((Delayed)obj) == 0: false;<a name="line.101"></a> |
| <span class="sourceLineNo">102</span> }<a name="line.102"></a> |
| <span class="sourceLineNo">103</span><a name="line.103"></a> |
| <span class="sourceLineNo">104</span> @Override<a name="line.104"></a> |
| <span class="sourceLineNo">105</span> public int hashCode() {<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> return this.wrapped.hashCode();<a name="line.106"></a> |
| <span class="sourceLineNo">107</span> }<a name="line.107"></a> |
| <span class="sourceLineNo">108</span><a name="line.108"></a> |
| <span class="sourceLineNo">109</span> @Override<a name="line.109"></a> |
| <span class="sourceLineNo">110</span> public void run() {<a name="line.110"></a> |
| <span class="sourceLineNo">111</span> wrapped.run();<a name="line.111"></a> |
| <span class="sourceLineNo">112</span> }<a name="line.112"></a> |
| <span class="sourceLineNo">113</span><a name="line.113"></a> |
| <span class="sourceLineNo">114</span> @Override<a name="line.114"></a> |
| <span class="sourceLineNo">115</span> public boolean cancel(boolean mayInterruptIfRunning) {<a name="line.115"></a> |
| <span class="sourceLineNo">116</span> return wrapped.cancel(mayInterruptIfRunning);<a name="line.116"></a> |
| <span class="sourceLineNo">117</span> }<a name="line.117"></a> |
| <span class="sourceLineNo">118</span><a name="line.118"></a> |
| <span class="sourceLineNo">119</span> @Override<a name="line.119"></a> |
| <span class="sourceLineNo">120</span> public boolean isCancelled() {<a name="line.120"></a> |
| <span class="sourceLineNo">121</span> return wrapped.isCancelled();<a name="line.121"></a> |
| <span class="sourceLineNo">122</span> }<a name="line.122"></a> |
| <span class="sourceLineNo">123</span><a name="line.123"></a> |
| <span class="sourceLineNo">124</span> @Override<a name="line.124"></a> |
| <span class="sourceLineNo">125</span> public boolean isDone() {<a name="line.125"></a> |
| <span class="sourceLineNo">126</span> return wrapped.isDone();<a name="line.126"></a> |
| <span class="sourceLineNo">127</span> }<a name="line.127"></a> |
| <span class="sourceLineNo">128</span><a name="line.128"></a> |
| <span class="sourceLineNo">129</span> @Override<a name="line.129"></a> |
| <span class="sourceLineNo">130</span> public V get() throws InterruptedException, ExecutionException {<a name="line.130"></a> |
| <span class="sourceLineNo">131</span> return wrapped.get();<a name="line.131"></a> |
| <span class="sourceLineNo">132</span> }<a name="line.132"></a> |
| <span class="sourceLineNo">133</span><a name="line.133"></a> |
| <span class="sourceLineNo">134</span> @Override<a name="line.134"></a> |
| <span class="sourceLineNo">135</span> public V get(long timeout,<a name="line.135"></a> |
| <span class="sourceLineNo">136</span> TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {<a name="line.136"></a> |
| <span class="sourceLineNo">137</span> return wrapped.get(timeout, unit);<a name="line.137"></a> |
| <span class="sourceLineNo">138</span> }<a name="line.138"></a> |
| <span class="sourceLineNo">139</span> }<a name="line.139"></a> |
| <span class="sourceLineNo">140</span>}<a name="line.140"></a> |
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| </pre> |
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