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Posted to commits@hbase.apache.org by mi...@apache.org on 2016/01/15 18:04:10 UTC
[05/51] [partial] hbase-site git commit: Published site at
cb17c7a97a1e2eb0ebd532f614191e4edbb9e49b.
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/50917b1d/devapidocs/src-html/org/apache/hadoop/hbase/master/procedure/MasterProcedureQueue.AbstractRunQueue.html
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-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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-<pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a>
-<span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a>
-<span class="sourceLineNo">003</span> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a>
-<span class="sourceLineNo">004</span> * distributed with this work for additional information<a name="line.4"></a>
-<span class="sourceLineNo">005</span> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a>
-<span class="sourceLineNo">006</span> * to you under the Apache License, Version 2.0 (the<a name="line.6"></a>
-<span class="sourceLineNo">007</span> * "License"); you may not use this file except in compliance<a name="line.7"></a>
-<span class="sourceLineNo">008</span> * with the License. You may obtain a copy of the License at<a name="line.8"></a>
-<span class="sourceLineNo">009</span> *<a name="line.9"></a>
-<span class="sourceLineNo">010</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
-<span class="sourceLineNo">011</span> *<a name="line.11"></a>
-<span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a>
-<span class="sourceLineNo">013</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a>
-<span class="sourceLineNo">014</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a>
-<span class="sourceLineNo">015</span> * See the License for the specific language governing permissions and<a name="line.15"></a>
-<span class="sourceLineNo">016</span> * limitations under the License.<a name="line.16"></a>
-<span class="sourceLineNo">017</span> */<a name="line.17"></a>
-<span class="sourceLineNo">018</span><a name="line.18"></a>
-<span class="sourceLineNo">019</span>package org.apache.hadoop.hbase.master.procedure;<a name="line.19"></a>
-<span class="sourceLineNo">020</span><a name="line.20"></a>
-<span class="sourceLineNo">021</span>import java.io.IOException;<a name="line.21"></a>
-<span class="sourceLineNo">022</span>import java.util.ArrayDeque;<a name="line.22"></a>
-<span class="sourceLineNo">023</span>import java.util.Deque;<a name="line.23"></a>
-<span class="sourceLineNo">024</span>import java.util.concurrent.locks.Condition;<a name="line.24"></a>
-<span class="sourceLineNo">025</span>import java.util.concurrent.locks.ReentrantLock;<a name="line.25"></a>
-<span class="sourceLineNo">026</span><a name="line.26"></a>
-<span class="sourceLineNo">027</span>import org.apache.commons.logging.Log;<a name="line.27"></a>
-<span class="sourceLineNo">028</span>import org.apache.commons.logging.LogFactory;<a name="line.28"></a>
-<span class="sourceLineNo">029</span>import org.apache.hadoop.conf.Configuration;<a name="line.29"></a>
-<span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.ServerName;<a name="line.30"></a>
-<span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.TableName;<a name="line.31"></a>
-<span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.TableExistsException;<a name="line.32"></a>
-<span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.TableNotFoundException;<a name="line.33"></a>
-<span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.34"></a>
-<span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.classification.InterfaceStability;<a name="line.35"></a>
-<span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.procedure2.Procedure;<a name="line.36"></a>
-<span class="sourceLineNo">037</span>import org.apache.hadoop.hbase.procedure2.ProcedureFairRunQueues;<a name="line.37"></a>
-<span class="sourceLineNo">038</span>import org.apache.hadoop.hbase.procedure2.ProcedureRunnableSet;<a name="line.38"></a>
-<span class="sourceLineNo">039</span>import org.apache.hadoop.hbase.master.TableLockManager;<a name="line.39"></a>
-<span class="sourceLineNo">040</span>import org.apache.hadoop.hbase.master.TableLockManager.TableLock;<a name="line.40"></a>
-<span class="sourceLineNo">041</span>import org.apache.hadoop.hbase.master.procedure.TableProcedureInterface.TableOperationType;<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> * ProcedureRunnableSet for the Master Procedures.<a name="line.44"></a>
-<span class="sourceLineNo">045</span> * This RunnableSet tries to provide to the ProcedureExecutor procedures<a name="line.45"></a>
-<span class="sourceLineNo">046</span> * that can be executed without having to wait on a lock.<a name="line.46"></a>
-<span class="sourceLineNo">047</span> * Most of the master operations can be executed concurrently, if they<a name="line.47"></a>
-<span class="sourceLineNo">048</span> * are operating on different tables (e.g. two create table can be performed<a name="line.48"></a>
-<span class="sourceLineNo">049</span> * at the same, time assuming table A and table B) or against two different servers; say<a name="line.49"></a>
-<span class="sourceLineNo">050</span> * two servers that crashed at about the same time.<a name="line.50"></a>
-<span class="sourceLineNo">051</span> *<a name="line.51"></a>
-<span class="sourceLineNo">052</span> * <p>Each procedure should implement an interface providing information for this queue.<a name="line.52"></a>
-<span class="sourceLineNo">053</span> * for example table related procedures should implement TableProcedureInterface.<a name="line.53"></a>
-<span class="sourceLineNo">054</span> * each procedure will be pushed in its own queue, and based on the operation type<a name="line.54"></a>
-<span class="sourceLineNo">055</span> * we may take smarter decision. e.g. we can abort all the operations preceding<a name="line.55"></a>
-<span class="sourceLineNo">056</span> * a delete table, or similar.<a name="line.56"></a>
-<span class="sourceLineNo">057</span> */<a name="line.57"></a>
-<span class="sourceLineNo">058</span>@InterfaceAudience.Private<a name="line.58"></a>
-<span class="sourceLineNo">059</span>@InterfaceStability.Evolving<a name="line.59"></a>
-<span class="sourceLineNo">060</span>public class MasterProcedureQueue implements ProcedureRunnableSet {<a name="line.60"></a>
-<span class="sourceLineNo">061</span> private static final Log LOG = LogFactory.getLog(MasterProcedureQueue.class);<a name="line.61"></a>
-<span class="sourceLineNo">062</span><a name="line.62"></a>
-<span class="sourceLineNo">063</span> // Two queues to ensure that server procedures run ahead of table precedures always.<a name="line.63"></a>
-<span class="sourceLineNo">064</span> private final ProcedureFairRunQueues<TableName, RunQueue> tableFairQ;<a name="line.64"></a>
-<span class="sourceLineNo">065</span> /**<a name="line.65"></a>
-<span class="sourceLineNo">066</span> * Rely on basic fair q. ServerCrashProcedure will yield if meta is not assigned. This way, the<a name="line.66"></a>
-<span class="sourceLineNo">067</span> * server that was carrying meta should rise to the top of the queue (this is how it used to<a name="line.67"></a>
-<span class="sourceLineNo">068</span> * work when we had handlers and ServerShutdownHandler ran). TODO: special handling of servers<a name="line.68"></a>
-<span class="sourceLineNo">069</span> * that were carrying system tables on crash; do I need to have these servers have priority?<a name="line.69"></a>
-<span class="sourceLineNo">070</span> *<a name="line.70"></a>
-<span class="sourceLineNo">071</span> * <p>Apart from the special-casing of meta and system tables, fairq is what we want<a name="line.71"></a>
-<span class="sourceLineNo">072</span> */<a name="line.72"></a>
-<span class="sourceLineNo">073</span> private final ProcedureFairRunQueues<ServerName, RunQueue> serverFairQ;<a name="line.73"></a>
-<span class="sourceLineNo">074</span><a name="line.74"></a>
-<span class="sourceLineNo">075</span> private final ReentrantLock lock = new ReentrantLock();<a name="line.75"></a>
-<span class="sourceLineNo">076</span> private final Condition waitCond = lock.newCondition();<a name="line.76"></a>
-<span class="sourceLineNo">077</span> private final TableLockManager lockManager;<a name="line.77"></a>
-<span class="sourceLineNo">078</span><a name="line.78"></a>
-<span class="sourceLineNo">079</span> private final int metaTablePriority;<a name="line.79"></a>
-<span class="sourceLineNo">080</span> private final int userTablePriority;<a name="line.80"></a>
-<span class="sourceLineNo">081</span> private final int sysTablePriority;<a name="line.81"></a>
-<span class="sourceLineNo">082</span> private static final int DEFAULT_SERVER_PRIORITY = 1;<a name="line.82"></a>
-<span class="sourceLineNo">083</span><a name="line.83"></a>
-<span class="sourceLineNo">084</span> /**<a name="line.84"></a>
-<span class="sourceLineNo">085</span> * Keeps count across server and table queues.<a name="line.85"></a>
-<span class="sourceLineNo">086</span> */<a name="line.86"></a>
-<span class="sourceLineNo">087</span> private int queueSize;<a name="line.87"></a>
-<span class="sourceLineNo">088</span><a name="line.88"></a>
-<span class="sourceLineNo">089</span> public MasterProcedureQueue(final Configuration conf, final TableLockManager lockManager) {<a name="line.89"></a>
-<span class="sourceLineNo">090</span> this.tableFairQ = new ProcedureFairRunQueues<TableName, RunQueue>(1);<a name="line.90"></a>
-<span class="sourceLineNo">091</span> this.serverFairQ = new ProcedureFairRunQueues<ServerName, RunQueue>(1);<a name="line.91"></a>
-<span class="sourceLineNo">092</span> this.lockManager = lockManager;<a name="line.92"></a>
-<span class="sourceLineNo">093</span><a name="line.93"></a>
-<span class="sourceLineNo">094</span> // TODO: should this be part of the HTD?<a name="line.94"></a>
-<span class="sourceLineNo">095</span> metaTablePriority = conf.getInt("hbase.master.procedure.queue.meta.table.priority", 3);<a name="line.95"></a>
-<span class="sourceLineNo">096</span> sysTablePriority = conf.getInt("hbase.master.procedure.queue.system.table.priority", 2);<a name="line.96"></a>
-<span class="sourceLineNo">097</span> userTablePriority = conf.getInt("hbase.master.procedure.queue.user.table.priority", 1);<a name="line.97"></a>
-<span class="sourceLineNo">098</span> }<a name="line.98"></a>
-<span class="sourceLineNo">099</span><a name="line.99"></a>
-<span class="sourceLineNo">100</span> @Override<a name="line.100"></a>
-<span class="sourceLineNo">101</span> public void addFront(final Procedure proc) {<a name="line.101"></a>
-<span class="sourceLineNo">102</span> lock.lock();<a name="line.102"></a>
-<span class="sourceLineNo">103</span> try {<a name="line.103"></a>
-<span class="sourceLineNo">104</span> getRunQueueOrCreate(proc).addFront(proc);<a name="line.104"></a>
-<span class="sourceLineNo">105</span> queueSize++;<a name="line.105"></a>
-<span class="sourceLineNo">106</span> waitCond.signal();<a name="line.106"></a>
-<span class="sourceLineNo">107</span> } finally {<a name="line.107"></a>
-<span class="sourceLineNo">108</span> lock.unlock();<a name="line.108"></a>
-<span class="sourceLineNo">109</span> }<a name="line.109"></a>
-<span class="sourceLineNo">110</span> }<a name="line.110"></a>
-<span class="sourceLineNo">111</span><a name="line.111"></a>
-<span class="sourceLineNo">112</span> @Override<a name="line.112"></a>
-<span class="sourceLineNo">113</span> public void addBack(final Procedure proc) {<a name="line.113"></a>
-<span class="sourceLineNo">114</span> lock.lock();<a name="line.114"></a>
-<span class="sourceLineNo">115</span> try {<a name="line.115"></a>
-<span class="sourceLineNo">116</span> getRunQueueOrCreate(proc).addBack(proc);<a name="line.116"></a>
-<span class="sourceLineNo">117</span> queueSize++;<a name="line.117"></a>
-<span class="sourceLineNo">118</span> waitCond.signal();<a name="line.118"></a>
-<span class="sourceLineNo">119</span> } finally {<a name="line.119"></a>
-<span class="sourceLineNo">120</span> lock.unlock();<a name="line.120"></a>
-<span class="sourceLineNo">121</span> }<a name="line.121"></a>
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-<span class="sourceLineNo">124</span> @Override<a name="line.124"></a>
-<span class="sourceLineNo">125</span> public void yield(final Procedure proc) {<a name="line.125"></a>
-<span class="sourceLineNo">126</span> addBack(proc);<a name="line.126"></a>
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-<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> @edu.umd.cs.findbugs.annotations.SuppressWarnings("WA_AWAIT_NOT_IN_LOOP")<a name="line.130"></a>
-<span class="sourceLineNo">131</span> public Long poll() {<a name="line.131"></a>
-<span class="sourceLineNo">132</span> Long pollResult = null;<a name="line.132"></a>
-<span class="sourceLineNo">133</span> lock.lock();<a name="line.133"></a>
-<span class="sourceLineNo">134</span> try {<a name="line.134"></a>
-<span class="sourceLineNo">135</span> if (queueSize == 0) {<a name="line.135"></a>
-<span class="sourceLineNo">136</span> waitCond.await();<a name="line.136"></a>
-<span class="sourceLineNo">137</span> if (queueSize == 0) {<a name="line.137"></a>
-<span class="sourceLineNo">138</span> return null;<a name="line.138"></a>
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-<span class="sourceLineNo">140</span> }<a name="line.140"></a>
-<span class="sourceLineNo">141</span> // For now, let server handling have precedence over table handling; presumption is that it<a name="line.141"></a>
-<span class="sourceLineNo">142</span> // is more important handling crashed servers than it is running the<a name="line.142"></a>
-<span class="sourceLineNo">143</span> // enabling/disabling tables, etc.<a name="line.143"></a>
-<span class="sourceLineNo">144</span> pollResult = doPoll(serverFairQ.poll());<a name="line.144"></a>
-<span class="sourceLineNo">145</span> if (pollResult == null) {<a name="line.145"></a>
-<span class="sourceLineNo">146</span> pollResult = doPoll(tableFairQ.poll());<a name="line.146"></a>
-<span class="sourceLineNo">147</span> }<a name="line.147"></a>
-<span class="sourceLineNo">148</span> } catch (InterruptedException e) {<a name="line.148"></a>
-<span class="sourceLineNo">149</span> Thread.currentThread().interrupt();<a name="line.149"></a>
-<span class="sourceLineNo">150</span> } finally {<a name="line.150"></a>
-<span class="sourceLineNo">151</span> lock.unlock();<a name="line.151"></a>
-<span class="sourceLineNo">152</span> }<a name="line.152"></a>
-<span class="sourceLineNo">153</span> return pollResult;<a name="line.153"></a>
-<span class="sourceLineNo">154</span> }<a name="line.154"></a>
-<span class="sourceLineNo">155</span><a name="line.155"></a>
-<span class="sourceLineNo">156</span> private Long doPoll(final RunQueue rq) {<a name="line.156"></a>
-<span class="sourceLineNo">157</span> if (rq == null || !rq.isAvailable()) return null;<a name="line.157"></a>
-<span class="sourceLineNo">158</span> this.queueSize--;<a name="line.158"></a>
-<span class="sourceLineNo">159</span> return rq.poll();<a name="line.159"></a>
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-<span class="sourceLineNo">161</span><a name="line.161"></a>
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-<span class="sourceLineNo">163</span> public void signalAll() {<a name="line.163"></a>
-<span class="sourceLineNo">164</span> lock.lock();<a name="line.164"></a>
-<span class="sourceLineNo">165</span> try {<a name="line.165"></a>
-<span class="sourceLineNo">166</span> waitCond.signalAll();<a name="line.166"></a>
-<span class="sourceLineNo">167</span> } finally {<a name="line.167"></a>
-<span class="sourceLineNo">168</span> lock.unlock();<a name="line.168"></a>
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-<span class="sourceLineNo">172</span> @Override<a name="line.172"></a>
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-<span class="sourceLineNo">174</span> lock.lock();<a name="line.174"></a>
-<span class="sourceLineNo">175</span> try {<a name="line.175"></a>
-<span class="sourceLineNo">176</span> serverFairQ.clear();<a name="line.176"></a>
-<span class="sourceLineNo">177</span> tableFairQ.clear();<a name="line.177"></a>
-<span class="sourceLineNo">178</span> queueSize = 0;<a name="line.178"></a>
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-<span class="sourceLineNo">180</span> lock.unlock();<a name="line.180"></a>
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-<span class="sourceLineNo">187</span> try {<a name="line.187"></a>
-<span class="sourceLineNo">188</span> return queueSize;<a name="line.188"></a>
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-<span class="sourceLineNo">195</span> public String toString() {<a name="line.195"></a>
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-<span class="sourceLineNo">198</span> return "MasterProcedureQueue size=" + queueSize + ": tableFairQ: " + tableFairQ +<a name="line.198"></a>
-<span class="sourceLineNo">199</span> ", serverFairQ: " + serverFairQ;<a name="line.199"></a>
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-<span class="sourceLineNo">206</span> public void completionCleanup(Procedure proc) {<a name="line.206"></a>
-<span class="sourceLineNo">207</span> if (proc instanceof TableProcedureInterface) {<a name="line.207"></a>
-<span class="sourceLineNo">208</span> TableProcedureInterface iProcTable = (TableProcedureInterface)proc;<a name="line.208"></a>
-<span class="sourceLineNo">209</span> boolean tableDeleted;<a name="line.209"></a>
-<span class="sourceLineNo">210</span> if (proc.hasException()) {<a name="line.210"></a>
-<span class="sourceLineNo">211</span> IOException procEx = proc.getException().unwrapRemoteException();<a name="line.211"></a>
-<span class="sourceLineNo">212</span> if (iProcTable.getTableOperationType() == TableOperationType.CREATE) {<a name="line.212"></a>
-<span class="sourceLineNo">213</span> // create failed because the table already exist<a name="line.213"></a>
-<span class="sourceLineNo">214</span> tableDeleted = !(procEx instanceof TableExistsException);<a name="line.214"></a>
-<span class="sourceLineNo">215</span> } else {<a name="line.215"></a>
-<span class="sourceLineNo">216</span> // the operation failed because the table does not exist<a name="line.216"></a>
-<span class="sourceLineNo">217</span> tableDeleted = (procEx instanceof TableNotFoundException);<a name="line.217"></a>
-<span class="sourceLineNo">218</span> }<a name="line.218"></a>
-<span class="sourceLineNo">219</span> } else {<a name="line.219"></a>
-<span class="sourceLineNo">220</span> // the table was deleted<a name="line.220"></a>
-<span class="sourceLineNo">221</span> tableDeleted = (iProcTable.getTableOperationType() == TableOperationType.DELETE);<a name="line.221"></a>
-<span class="sourceLineNo">222</span> }<a name="line.222"></a>
-<span class="sourceLineNo">223</span> if (tableDeleted) {<a name="line.223"></a>
-<span class="sourceLineNo">224</span> markTableAsDeleted(iProcTable.getTableName());<a name="line.224"></a>
-<span class="sourceLineNo">225</span> }<a name="line.225"></a>
-<span class="sourceLineNo">226</span> }<a name="line.226"></a>
-<span class="sourceLineNo">227</span> // No cleanup for ServerProcedureInterface types, yet.<a name="line.227"></a>
-<span class="sourceLineNo">228</span> }<a name="line.228"></a>
-<span class="sourceLineNo">229</span><a name="line.229"></a>
-<span class="sourceLineNo">230</span> private RunQueue getRunQueueOrCreate(final Procedure proc) {<a name="line.230"></a>
-<span class="sourceLineNo">231</span> if (proc instanceof TableProcedureInterface) {<a name="line.231"></a>
-<span class="sourceLineNo">232</span> final TableName table = ((TableProcedureInterface)proc).getTableName();<a name="line.232"></a>
-<span class="sourceLineNo">233</span> return getRunQueueOrCreate(table);<a name="line.233"></a>
-<span class="sourceLineNo">234</span> }<a name="line.234"></a>
-<span class="sourceLineNo">235</span> if (proc instanceof ServerProcedureInterface) {<a name="line.235"></a>
-<span class="sourceLineNo">236</span> return getRunQueueOrCreate((ServerProcedureInterface)proc);<a name="line.236"></a>
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