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Posted to commits@hbase.apache.org by gi...@apache.org on 2017/08/22 15:07:05 UTC
[11/21] hbase-site git commit: Published site at .
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/b7626a4c/devapidocs/src-html/org/apache/hadoop/hbase/zookeeper/ZooKeeperWatcher.ZKDisconnectEventWatcher.html
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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>package org.apache.hadoop.hbase.zookeeper;<a name="line.19"></a>
-<span class="sourceLineNo">020</span><a name="line.20"></a>
-<span class="sourceLineNo">021</span>import java.io.Closeable;<a name="line.21"></a>
-<span class="sourceLineNo">022</span>import java.io.IOException;<a name="line.22"></a>
-<span class="sourceLineNo">023</span>import java.util.ArrayList;<a name="line.23"></a>
-<span class="sourceLineNo">024</span>import java.util.HashMap;<a name="line.24"></a>
-<span class="sourceLineNo">025</span>import java.util.List;<a name="line.25"></a>
-<span class="sourceLineNo">026</span>import java.util.Map;<a name="line.26"></a>
-<span class="sourceLineNo">027</span>import java.util.concurrent.CopyOnWriteArrayList;<a name="line.27"></a>
-<span class="sourceLineNo">028</span>import java.util.concurrent.CountDownLatch;<a name="line.28"></a>
-<span class="sourceLineNo">029</span>import java.util.concurrent.ExecutorService;<a name="line.29"></a>
-<span class="sourceLineNo">030</span>import java.util.concurrent.Executors;<a name="line.30"></a>
-<span class="sourceLineNo">031</span>import java.util.concurrent.atomic.AtomicBoolean;<a name="line.31"></a>
-<span class="sourceLineNo">032</span>import java.util.regex.Matcher;<a name="line.32"></a>
-<span class="sourceLineNo">033</span>import java.util.regex.Pattern;<a name="line.33"></a>
-<span class="sourceLineNo">034</span><a name="line.34"></a>
-<span class="sourceLineNo">035</span>import org.apache.commons.logging.Log;<a name="line.35"></a>
-<span class="sourceLineNo">036</span>import org.apache.commons.logging.LogFactory;<a name="line.36"></a>
-<span class="sourceLineNo">037</span>import org.apache.hadoop.conf.Configuration;<a name="line.37"></a>
-<span class="sourceLineNo">038</span>import org.apache.hadoop.hbase.Abortable;<a name="line.38"></a>
-<span class="sourceLineNo">039</span>import org.apache.hadoop.hbase.AuthUtil;<a name="line.39"></a>
-<span class="sourceLineNo">040</span>import org.apache.hadoop.hbase.HConstants;<a name="line.40"></a>
-<span class="sourceLineNo">041</span>import org.apache.hadoop.hbase.HRegionInfo;<a name="line.41"></a>
-<span class="sourceLineNo">042</span>import org.apache.hadoop.hbase.ZooKeeperConnectionException;<a name="line.42"></a>
-<span class="sourceLineNo">043</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.43"></a>
-<span class="sourceLineNo">044</span>import org.apache.hadoop.hbase.security.Superusers;<a name="line.44"></a>
-<span class="sourceLineNo">045</span>import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;<a name="line.45"></a>
-<span class="sourceLineNo">046</span>import org.apache.hadoop.security.UserGroupInformation;<a name="line.46"></a>
-<span class="sourceLineNo">047</span>import org.apache.zookeeper.KeeperException;<a name="line.47"></a>
-<span class="sourceLineNo">048</span>import org.apache.zookeeper.WatchedEvent;<a name="line.48"></a>
-<span class="sourceLineNo">049</span>import org.apache.zookeeper.Watcher;<a name="line.49"></a>
-<span class="sourceLineNo">050</span>import org.apache.zookeeper.ZooDefs.Ids;<a name="line.50"></a>
-<span class="sourceLineNo">051</span>import org.apache.zookeeper.ZooDefs.Perms;<a name="line.51"></a>
-<span class="sourceLineNo">052</span>import org.apache.zookeeper.data.ACL;<a name="line.52"></a>
-<span class="sourceLineNo">053</span>import org.apache.zookeeper.data.Id;<a name="line.53"></a>
-<span class="sourceLineNo">054</span>import org.apache.zookeeper.data.Stat;<a name="line.54"></a>
-<span class="sourceLineNo">055</span><a name="line.55"></a>
-<span class="sourceLineNo">056</span>/**<a name="line.56"></a>
-<span class="sourceLineNo">057</span> * Acts as the single ZooKeeper Watcher. One instance of this is instantiated<a name="line.57"></a>
-<span class="sourceLineNo">058</span> * for each Master, RegionServer, and client process.<a name="line.58"></a>
-<span class="sourceLineNo">059</span> *<a name="line.59"></a>
-<span class="sourceLineNo">060</span> * <p>This is the only class that implements {@link Watcher}. Other internal<a name="line.60"></a>
-<span class="sourceLineNo">061</span> * classes which need to be notified of ZooKeeper events must register with<a name="line.61"></a>
-<span class="sourceLineNo">062</span> * the local instance of this watcher via {@link #registerListener}.<a name="line.62"></a>
-<span class="sourceLineNo">063</span> *<a name="line.63"></a>
-<span class="sourceLineNo">064</span> * <p>This class also holds and manages the connection to ZooKeeper. Code to<a name="line.64"></a>
-<span class="sourceLineNo">065</span> * deal with connection related events and exceptions are handled here.<a name="line.65"></a>
-<span class="sourceLineNo">066</span> */<a name="line.66"></a>
-<span class="sourceLineNo">067</span>@InterfaceAudience.Private<a name="line.67"></a>
-<span class="sourceLineNo">068</span>public class ZooKeeperWatcher implements Watcher, Abortable, Closeable {<a name="line.68"></a>
-<span class="sourceLineNo">069</span> private static final Log LOG = LogFactory.getLog(ZooKeeperWatcher.class);<a name="line.69"></a>
-<span class="sourceLineNo">070</span><a name="line.70"></a>
-<span class="sourceLineNo">071</span> // Identifier for this watcher (for logging only). It is made of the prefix<a name="line.71"></a>
-<span class="sourceLineNo">072</span> // passed on construction and the zookeeper sessionid.<a name="line.72"></a>
-<span class="sourceLineNo">073</span> private String prefix;<a name="line.73"></a>
-<span class="sourceLineNo">074</span> private String identifier;<a name="line.74"></a>
-<span class="sourceLineNo">075</span><a name="line.75"></a>
-<span class="sourceLineNo">076</span> // zookeeper quorum<a name="line.76"></a>
-<span class="sourceLineNo">077</span> private String quorum;<a name="line.77"></a>
-<span class="sourceLineNo">078</span><a name="line.78"></a>
-<span class="sourceLineNo">079</span> // zookeeper connection<a name="line.79"></a>
-<span class="sourceLineNo">080</span> private final RecoverableZooKeeper recoverableZooKeeper;<a name="line.80"></a>
-<span class="sourceLineNo">081</span><a name="line.81"></a>
-<span class="sourceLineNo">082</span> // abortable in case of zk failure<a name="line.82"></a>
-<span class="sourceLineNo">083</span> protected final Abortable abortable;<a name="line.83"></a>
-<span class="sourceLineNo">084</span> // Used if abortable is null<a name="line.84"></a>
-<span class="sourceLineNo">085</span> private boolean aborted = false;<a name="line.85"></a>
-<span class="sourceLineNo">086</span><a name="line.86"></a>
-<span class="sourceLineNo">087</span> public final ZNodePaths znodePaths;<a name="line.87"></a>
-<span class="sourceLineNo">088</span><a name="line.88"></a>
-<span class="sourceLineNo">089</span> // listeners to be notified<a name="line.89"></a>
-<span class="sourceLineNo">090</span> private final List<ZooKeeperListener> listeners = new CopyOnWriteArrayList<>();<a name="line.90"></a>
-<span class="sourceLineNo">091</span><a name="line.91"></a>
-<span class="sourceLineNo">092</span> // Used by ZKUtil:waitForZKConnectionIfAuthenticating to wait for SASL<a name="line.92"></a>
-<span class="sourceLineNo">093</span> // negotiation to complete<a name="line.93"></a>
-<span class="sourceLineNo">094</span> public CountDownLatch saslLatch = new CountDownLatch(1);<a name="line.94"></a>
-<span class="sourceLineNo">095</span><a name="line.95"></a>
-<span class="sourceLineNo">096</span> // Connection timeout on disconnect event<a name="line.96"></a>
-<span class="sourceLineNo">097</span> private long connWaitTimeOut;<a name="line.97"></a>
-<span class="sourceLineNo">098</span> private AtomicBoolean connected = new AtomicBoolean(false);<a name="line.98"></a>
-<span class="sourceLineNo">099</span> private boolean forceAbortOnZKDisconnect;<a name="line.99"></a>
-<span class="sourceLineNo">100</span> <a name="line.100"></a>
-<span class="sourceLineNo">101</span> // Execute service for zookeeper disconnect event watcher<a name="line.101"></a>
-<span class="sourceLineNo">102</span> private ExecutorService zkEventWatcherExecService = null;<a name="line.102"></a>
-<span class="sourceLineNo">103</span><a name="line.103"></a>
-<span class="sourceLineNo">104</span><a name="line.104"></a>
-<span class="sourceLineNo">105</span> private final Configuration conf;<a name="line.105"></a>
-<span class="sourceLineNo">106</span><a name="line.106"></a>
-<span class="sourceLineNo">107</span> /* A pattern that matches a Kerberos name, borrowed from Hadoop's KerberosName */<a name="line.107"></a>
-<span class="sourceLineNo">108</span> private static final Pattern NAME_PATTERN = Pattern.compile("([^/@]*)(/([^/@]*))?@([^/@]*)");<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> * Instantiate a ZooKeeper connection and watcher.<a name="line.111"></a>
-<span class="sourceLineNo">112</span> * @param identifier string that is passed to RecoverableZookeeper to be used as<a name="line.112"></a>
-<span class="sourceLineNo">113</span> * identifier for this instance. Use null for default.<a name="line.113"></a>
-<span class="sourceLineNo">114</span> * @throws IOException<a name="line.114"></a>
-<span class="sourceLineNo">115</span> * @throws ZooKeeperConnectionException<a name="line.115"></a>
-<span class="sourceLineNo">116</span> */<a name="line.116"></a>
-<span class="sourceLineNo">117</span> public ZooKeeperWatcher(Configuration conf, String identifier,<a name="line.117"></a>
-<span class="sourceLineNo">118</span> Abortable abortable) throws ZooKeeperConnectionException, IOException {<a name="line.118"></a>
-<span class="sourceLineNo">119</span> this(conf, identifier, abortable, false);<a name="line.119"></a>
-<span class="sourceLineNo">120</span> }<a name="line.120"></a>
-<span class="sourceLineNo">121</span><a name="line.121"></a>
-<span class="sourceLineNo">122</span> /**<a name="line.122"></a>
-<span class="sourceLineNo">123</span> * Instantiate a ZooKeeper connection and watcher.<a name="line.123"></a>
-<span class="sourceLineNo">124</span> * @param conf<a name="line.124"></a>
-<span class="sourceLineNo">125</span> * @param identifier string that is passed to RecoverableZookeeper to be used as identifier for<a name="line.125"></a>
-<span class="sourceLineNo">126</span> * this instance. Use null for default.<a name="line.126"></a>
-<span class="sourceLineNo">127</span> * @param abortable Can be null if there is on error there is no host to abort: e.g. client<a name="line.127"></a>
-<span class="sourceLineNo">128</span> * context.<a name="line.128"></a>
-<span class="sourceLineNo">129</span> * @param canCreateBaseZNode<a name="line.129"></a>
-<span class="sourceLineNo">130</span> * @throws IOException<a name="line.130"></a>
-<span class="sourceLineNo">131</span> * @throws ZooKeeperConnectionException<a name="line.131"></a>
-<span class="sourceLineNo">132</span> */<a name="line.132"></a>
-<span class="sourceLineNo">133</span> public ZooKeeperWatcher(Configuration conf, String identifier,<a name="line.133"></a>
-<span class="sourceLineNo">134</span> Abortable abortable, boolean canCreateBaseZNode)<a name="line.134"></a>
-<span class="sourceLineNo">135</span> throws IOException, ZooKeeperConnectionException {<a name="line.135"></a>
-<span class="sourceLineNo">136</span> this(conf, identifier, abortable, canCreateBaseZNode, false);<a name="line.136"></a>
-<span class="sourceLineNo">137</span> }<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> * Instantiate a ZooKeeper connection and watcher.<a name="line.140"></a>
-<span class="sourceLineNo">141</span> * @param conf Configuration<a name="line.141"></a>
-<span class="sourceLineNo">142</span> * @param identifier string that is passed to RecoverableZookeeper to be used as identifier for<a name="line.142"></a>
-<span class="sourceLineNo">143</span> * this instance. Use null for default.<a name="line.143"></a>
-<span class="sourceLineNo">144</span> * @param abortable Can be null if there is on error there is no host to abort: e.g. client<a name="line.144"></a>
-<span class="sourceLineNo">145</span> * context.<a name="line.145"></a>
-<span class="sourceLineNo">146</span> * @param canCreateBaseZNode whether create base node.<a name="line.146"></a>
-<span class="sourceLineNo">147</span> * @param forceAbortOnZKDisconnect abort the watcher if true.<a name="line.147"></a>
-<span class="sourceLineNo">148</span> * @throws IOException when any IO exception<a name="line.148"></a>
-<span class="sourceLineNo">149</span> * @throws ZooKeeperConnectionException when any zookeeper connection exception<a name="line.149"></a>
-<span class="sourceLineNo">150</span> */<a name="line.150"></a>
-<span class="sourceLineNo">151</span> public ZooKeeperWatcher(Configuration conf, String identifier, Abortable abortable,<a name="line.151"></a>
-<span class="sourceLineNo">152</span> boolean canCreateBaseZNode, boolean forceAbortOnZKDisconnect) throws IOException,<a name="line.152"></a>
-<span class="sourceLineNo">153</span> ZooKeeperConnectionException {<a name="line.153"></a>
-<span class="sourceLineNo">154</span> this.conf = conf;<a name="line.154"></a>
-<span class="sourceLineNo">155</span> this.quorum = ZKConfig.getZKQuorumServersString(conf);<a name="line.155"></a>
-<span class="sourceLineNo">156</span> this.prefix = identifier;<a name="line.156"></a>
-<span class="sourceLineNo">157</span> // Identifier will get the sessionid appended later below down when we<a name="line.157"></a>
-<span class="sourceLineNo">158</span> // handle the syncconnect event.<a name="line.158"></a>
-<span class="sourceLineNo">159</span> this.identifier = identifier + "0x0";<a name="line.159"></a>
-<span class="sourceLineNo">160</span> this.abortable = abortable;<a name="line.160"></a>
-<span class="sourceLineNo">161</span> this.znodePaths = new ZNodePaths(conf);<a name="line.161"></a>
-<span class="sourceLineNo">162</span> // On Disconnected event a thread will wait for sometime (2/3 of zookeeper.session.timeout),<a name="line.162"></a>
-<span class="sourceLineNo">163</span> // it will abort the process if no SyncConnected event reported by the time.<a name="line.163"></a>
-<span class="sourceLineNo">164</span> connWaitTimeOut = this.conf.getLong("zookeeper.session.timeout", 90000) * 2 / 3;<a name="line.164"></a>
-<span class="sourceLineNo">165</span> PendingWatcher pendingWatcher = new PendingWatcher();<a name="line.165"></a>
-<span class="sourceLineNo">166</span> this.recoverableZooKeeper = ZKUtil.connect(conf, quorum, pendingWatcher, identifier);<a name="line.166"></a>
-<span class="sourceLineNo">167</span> pendingWatcher.prepare(this);<a name="line.167"></a>
-<span class="sourceLineNo">168</span> if (canCreateBaseZNode) {<a name="line.168"></a>
-<span class="sourceLineNo">169</span> try {<a name="line.169"></a>
-<span class="sourceLineNo">170</span> createBaseZNodes();<a name="line.170"></a>
-<span class="sourceLineNo">171</span> } catch (ZooKeeperConnectionException zce) {<a name="line.171"></a>
-<span class="sourceLineNo">172</span> try {<a name="line.172"></a>
-<span class="sourceLineNo">173</span> this.recoverableZooKeeper.close();<a name="line.173"></a>
-<span class="sourceLineNo">174</span> } catch (InterruptedException ie) {<a name="line.174"></a>
-<span class="sourceLineNo">175</span> LOG.debug("Encountered InterruptedException when closing " + this.recoverableZooKeeper);<a name="line.175"></a>
-<span class="sourceLineNo">176</span> Thread.currentThread().interrupt();<a name="line.176"></a>
-<span class="sourceLineNo">177</span> }<a name="line.177"></a>
-<span class="sourceLineNo">178</span> throw zce;<a name="line.178"></a>
-<span class="sourceLineNo">179</span> }<a name="line.179"></a>
-<span class="sourceLineNo">180</span> }<a name="line.180"></a>
-<span class="sourceLineNo">181</span> this.forceAbortOnZKDisconnect = forceAbortOnZKDisconnect;<a name="line.181"></a>
-<span class="sourceLineNo">182</span> if (this.forceAbortOnZKDisconnect) {<a name="line.182"></a>
-<span class="sourceLineNo">183</span> this.zkEventWatcherExecService = Executors.newSingleThreadExecutor();<a name="line.183"></a>
-<span class="sourceLineNo">184</span> }<a name="line.184"></a>
-<span class="sourceLineNo">185</span> }<a name="line.185"></a>
-<span class="sourceLineNo">186</span><a name="line.186"></a>
-<span class="sourceLineNo">187</span> private void createBaseZNodes() throws ZooKeeperConnectionException {<a name="line.187"></a>
-<span class="sourceLineNo">188</span> try {<a name="line.188"></a>
-<span class="sourceLineNo">189</span> // Create all the necessary "directories" of znodes<a name="line.189"></a>
-<span class="sourceLineNo">190</span> ZKUtil.createWithParents(this, znodePaths.baseZNode);<a name="line.190"></a>
-<span class="sourceLineNo">191</span> ZKUtil.createAndFailSilent(this, znodePaths.rsZNode);<a name="line.191"></a>
-<span class="sourceLineNo">192</span> ZKUtil.createAndFailSilent(this, znodePaths.drainingZNode);<a name="line.192"></a>
-<span class="sourceLineNo">193</span> ZKUtil.createAndFailSilent(this, znodePaths.tableZNode);<a name="line.193"></a>
-<span class="sourceLineNo">194</span> ZKUtil.createAndFailSilent(this, znodePaths.splitLogZNode);<a name="line.194"></a>
-<span class="sourceLineNo">195</span> ZKUtil.createAndFailSilent(this, znodePaths.backupMasterAddressesZNode);<a name="line.195"></a>
-<span class="sourceLineNo">196</span> ZKUtil.createAndFailSilent(this, znodePaths.tableLockZNode);<a name="line.196"></a>
-<span class="sourceLineNo">197</span> ZKUtil.createAndFailSilent(this, znodePaths.recoveringRegionsZNode);<a name="line.197"></a>
-<span class="sourceLineNo">198</span> ZKUtil.createAndFailSilent(this, znodePaths.masterMaintZNode);<a name="line.198"></a>
-<span class="sourceLineNo">199</span> } catch (KeeperException e) {<a name="line.199"></a>
-<span class="sourceLineNo">200</span> throw new ZooKeeperConnectionException(<a name="line.200"></a>
-<span class="sourceLineNo">201</span> prefix("Unexpected KeeperException creating base node"), e);<a name="line.201"></a>
-<span class="sourceLineNo">202</span> }<a name="line.202"></a>
-<span class="sourceLineNo">203</span> }<a name="line.203"></a>
-<span class="sourceLineNo">204</span><a name="line.204"></a>
-<span class="sourceLineNo">205</span> /** Returns whether the znode is supposed to be readable by the client<a name="line.205"></a>
-<span class="sourceLineNo">206</span> * and DOES NOT contain sensitive information (world readable).*/<a name="line.206"></a>
-<span class="sourceLineNo">207</span> public boolean isClientReadable(String node) {<a name="line.207"></a>
-<span class="sourceLineNo">208</span> // Developer notice: These znodes are world readable. DO NOT add more znodes here UNLESS<a name="line.208"></a>
-<span class="sourceLineNo">209</span> // all clients need to access this data to work. Using zk for sharing data to clients (other<a name="line.209"></a>
-<span class="sourceLineNo">210</span> // than service lookup case is not a recommended design pattern.<a name="line.210"></a>
-<span class="sourceLineNo">211</span> return<a name="line.211"></a>
-<span class="sourceLineNo">212</span> node.equals(znodePaths.baseZNode) ||<a name="line.212"></a>
-<span class="sourceLineNo">213</span> znodePaths.isAnyMetaReplicaZNode(node) ||<a name="line.213"></a>
-<span class="sourceLineNo">214</span> node.equals(znodePaths.masterAddressZNode) ||<a name="line.214"></a>
-<span class="sourceLineNo">215</span> node.equals(znodePaths.clusterIdZNode)||<a name="line.215"></a>
-<span class="sourceLineNo">216</span> node.equals(znodePaths.rsZNode) ||<a name="line.216"></a>
-<span class="sourceLineNo">217</span> // /hbase/table and /hbase/table/foo is allowed, /hbase/table-lock is not<a name="line.217"></a>
-<span class="sourceLineNo">218</span> node.equals(znodePaths.tableZNode) ||<a name="line.218"></a>
-<span class="sourceLineNo">219</span> node.startsWith(znodePaths.tableZNode + "/");<a name="line.219"></a>
-<span class="sourceLineNo">220</span> }<a name="line.220"></a>
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