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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>package org.apache.hadoop.hbase.zookeeper;<a name="line.18"></a> |
| <span class="sourceLineNo">019</span><a name="line.19"></a> |
| <span class="sourceLineNo">020</span>import java.io.IOException;<a name="line.20"></a> |
| <span class="sourceLineNo">021</span>import java.io.InterruptedIOException;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import java.util.ArrayList;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import java.util.Collections;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import java.util.Comparator;<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 org.apache.hadoop.hbase.Abortable;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>import org.apache.hadoop.hbase.HConstants;<a name="line.27"></a> |
| <span class="sourceLineNo">028</span>import org.apache.hadoop.hbase.ServerName;<a name="line.28"></a> |
| <span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.exceptions.DeserializationException;<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.trace.TraceUtil;<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.31"></a> |
| <span class="sourceLineNo">032</span>import org.apache.zookeeper.KeeperException;<a name="line.32"></a> |
| <span class="sourceLineNo">033</span>import org.apache.zookeeper.data.Stat;<a name="line.33"></a> |
| <span class="sourceLineNo">034</span><a name="line.34"></a> |
| <span class="sourceLineNo">035</span>import org.apache.hbase.thirdparty.com.google.protobuf.InvalidProtocolBufferException;<a name="line.35"></a> |
| <span class="sourceLineNo">036</span><a name="line.36"></a> |
| <span class="sourceLineNo">037</span>import org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil;<a name="line.37"></a> |
| <span class="sourceLineNo">038</span>import org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos;<a name="line.38"></a> |
| <span class="sourceLineNo">039</span>import org.apache.hadoop.hbase.shaded.protobuf.generated.ZooKeeperProtos;<a name="line.39"></a> |
| <span class="sourceLineNo">040</span><a name="line.40"></a> |
| <span class="sourceLineNo">041</span>/**<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> * Manages the location of the current active Master for the RegionServer.<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> * <p><a name="line.43"></a> |
| <span class="sourceLineNo">044</span> * Listens for ZooKeeper events related to the master address. The node <code>/master</code> will<a name="line.44"></a> |
| <span class="sourceLineNo">045</span> * contain the address of the current master. This listener is interested in<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> * <code>NodeDeleted</code> and <code>NodeCreated</code> events on <code>/master</code>.<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> * <p><a name="line.47"></a> |
| <span class="sourceLineNo">048</span> * Utilizes {@link ZKNodeTracker} for zk interactions.<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> * <p><a name="line.49"></a> |
| <span class="sourceLineNo">050</span> * You can get the current master via {@link #getMasterAddress()} or via<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> * {@link #getMasterAddress(ZKWatcher)} if you do not have a running instance of this Tracker in<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> * your context.<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> * <p><a name="line.53"></a> |
| <span class="sourceLineNo">054</span> * This class also includes utility for interacting with the master znode, for writing and reading<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> * the znode content.<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> */<a name="line.56"></a> |
| <span class="sourceLineNo">057</span>@InterfaceAudience.Private<a name="line.57"></a> |
| <span class="sourceLineNo">058</span>public class MasterAddressTracker extends ZKNodeTracker {<a name="line.58"></a> |
| <span class="sourceLineNo">059</span><a name="line.59"></a> |
| <span class="sourceLineNo">060</span> private volatile List<ServerName> backupMasters = Collections.emptyList();<a name="line.60"></a> |
| <span class="sourceLineNo">061</span><a name="line.61"></a> |
| <span class="sourceLineNo">062</span> /**<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> * Construct a master address listener with the specified <code>zookeeper</code> reference.<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> * <p><a name="line.64"></a> |
| <span class="sourceLineNo">065</span> * This constructor does not trigger any actions, you must call methods explicitly. Normally you<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> * will just want to execute {@link #start()} to begin tracking of the master address.<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> * @param watcher zk reference and watcher<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> * @param abortable abortable in case of fatal error<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> */<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> public MasterAddressTracker(ZKWatcher watcher, Abortable abortable) {<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> super(watcher, watcher.getZNodePaths().masterAddressZNode, abortable);<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> }<a name="line.72"></a> |
| <span class="sourceLineNo">073</span><a name="line.73"></a> |
| <span class="sourceLineNo">074</span> private void loadBackupMasters() {<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> TraceUtil.trace(() -> {<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> try {<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> backupMasters = Collections.unmodifiableList(getBackupMastersAndRenewWatch(watcher));<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> } catch (InterruptedIOException e) {<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> abortable.abort("Unexpected exception handling nodeChildrenChanged event", e);<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> }<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> }, "MasterAddressTracker.loadBackupMasters");<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> }<a name="line.82"></a> |
| <span class="sourceLineNo">083</span><a name="line.83"></a> |
| <span class="sourceLineNo">084</span> @Override<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> protected void postStart() {<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> loadBackupMasters();<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> }<a name="line.87"></a> |
| <span class="sourceLineNo">088</span><a name="line.88"></a> |
| <span class="sourceLineNo">089</span> @Override<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> public void nodeChildrenChanged(String path) {<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> if (path.equals(watcher.getZNodePaths().backupMasterAddressesZNode)) {<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> loadBackupMasters();<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> }<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> /**<a name="line.96"></a> |
| <span class="sourceLineNo">097</span> * Get the address of the current master if one is available. Returns null if no current master.<a name="line.97"></a> |
| <span class="sourceLineNo">098</span> * @return Server name or null if timed out.<a name="line.98"></a> |
| <span class="sourceLineNo">099</span> */<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> public ServerName getMasterAddress() {<a name="line.100"></a> |
| <span class="sourceLineNo">101</span> return getMasterAddress(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> /**<a name="line.104"></a> |
| <span class="sourceLineNo">105</span> * Get the info port of the current master of one is available. Return 0 if no current master or<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> * zookeeper is unavailable<a name="line.106"></a> |
| <span class="sourceLineNo">107</span> * @return info port or 0 if timed out<a name="line.107"></a> |
| <span class="sourceLineNo">108</span> */<a name="line.108"></a> |
| <span class="sourceLineNo">109</span> public int getMasterInfoPort() {<a name="line.109"></a> |
| <span class="sourceLineNo">110</span> try {<a name="line.110"></a> |
| <span class="sourceLineNo">111</span> final ZooKeeperProtos.Master master = parse(this.getData(false));<a name="line.111"></a> |
| <span class="sourceLineNo">112</span> if (master == null) {<a name="line.112"></a> |
| <span class="sourceLineNo">113</span> return 0;<a name="line.113"></a> |
| <span class="sourceLineNo">114</span> }<a name="line.114"></a> |
| <span class="sourceLineNo">115</span> return master.getInfoPort();<a name="line.115"></a> |
| <span class="sourceLineNo">116</span> } catch (DeserializationException e) {<a name="line.116"></a> |
| <span class="sourceLineNo">117</span> LOG.warn("Failed parse master zk node data", e);<a name="line.117"></a> |
| <span class="sourceLineNo">118</span> return 0;<a name="line.118"></a> |
| <span class="sourceLineNo">119</span> }<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> * Get the info port of the backup master if it is available. Return 0 if no backup master or<a name="line.123"></a> |
| <span class="sourceLineNo">124</span> * zookeeper is unavailable<a name="line.124"></a> |
| <span class="sourceLineNo">125</span> * @param sn server name of backup master<a name="line.125"></a> |
| <span class="sourceLineNo">126</span> * @return info port or 0 if timed out or exceptions<a name="line.126"></a> |
| <span class="sourceLineNo">127</span> */<a name="line.127"></a> |
| <span class="sourceLineNo">128</span> public int getBackupMasterInfoPort(final ServerName sn) {<a name="line.128"></a> |
| <span class="sourceLineNo">129</span> String backupZNode =<a name="line.129"></a> |
| <span class="sourceLineNo">130</span> ZNodePaths.joinZNode(watcher.getZNodePaths().backupMasterAddressesZNode, sn.toString());<a name="line.130"></a> |
| <span class="sourceLineNo">131</span> try {<a name="line.131"></a> |
| <span class="sourceLineNo">132</span> byte[] data = ZKUtil.getData(watcher, backupZNode);<a name="line.132"></a> |
| <span class="sourceLineNo">133</span> final ZooKeeperProtos.Master backup = parse(data);<a name="line.133"></a> |
| <span class="sourceLineNo">134</span> if (backup == null) {<a name="line.134"></a> |
| <span class="sourceLineNo">135</span> return 0;<a name="line.135"></a> |
| <span class="sourceLineNo">136</span> }<a name="line.136"></a> |
| <span class="sourceLineNo">137</span> return backup.getInfoPort();<a name="line.137"></a> |
| <span class="sourceLineNo">138</span> } catch (Exception e) {<a name="line.138"></a> |
| <span class="sourceLineNo">139</span> LOG.warn("Failed to get backup master: " + sn + "'s info port.", e);<a name="line.139"></a> |
| <span class="sourceLineNo">140</span> return 0;<a name="line.140"></a> |
| <span class="sourceLineNo">141</span> }<a name="line.141"></a> |
| <span class="sourceLineNo">142</span> }<a name="line.142"></a> |
| <span class="sourceLineNo">143</span><a name="line.143"></a> |
| <span class="sourceLineNo">144</span> /**<a name="line.144"></a> |
| <span class="sourceLineNo">145</span> * Get the address of the current master if one is available. Returns null if no current master.<a name="line.145"></a> |
| <span class="sourceLineNo">146</span> * If refresh is set, try to load the data from ZK again, otherwise, cached data will be used.<a name="line.146"></a> |
| <span class="sourceLineNo">147</span> * @param refresh whether to refresh the data by calling ZK directly.<a name="line.147"></a> |
| <span class="sourceLineNo">148</span> * @return Server name or null if timed out.<a name="line.148"></a> |
| <span class="sourceLineNo">149</span> */<a name="line.149"></a> |
| <span class="sourceLineNo">150</span> public ServerName getMasterAddress(final boolean refresh) {<a name="line.150"></a> |
| <span class="sourceLineNo">151</span> try {<a name="line.151"></a> |
| <span class="sourceLineNo">152</span> return ProtobufUtil.parseServerNameFrom(super.getData(refresh));<a name="line.152"></a> |
| <span class="sourceLineNo">153</span> } catch (DeserializationException e) {<a name="line.153"></a> |
| <span class="sourceLineNo">154</span> LOG.warn("Failed parse", e);<a name="line.154"></a> |
| <span class="sourceLineNo">155</span> return null;<a name="line.155"></a> |
| <span class="sourceLineNo">156</span> }<a name="line.156"></a> |
| <span class="sourceLineNo">157</span> }<a name="line.157"></a> |
| <span class="sourceLineNo">158</span><a name="line.158"></a> |
| <span class="sourceLineNo">159</span> /**<a name="line.159"></a> |
| <span class="sourceLineNo">160</span> * Get master address. Use this instead of {@link #getMasterAddress()} if you do not have an<a name="line.160"></a> |
| <span class="sourceLineNo">161</span> * instance of this tracker in your context.<a name="line.161"></a> |
| <span class="sourceLineNo">162</span> * @param zkw ZKWatcher to use<a name="line.162"></a> |
| <span class="sourceLineNo">163</span> * @return ServerName stored in the the master address znode or null if no znode present.<a name="line.163"></a> |
| <span class="sourceLineNo">164</span> * @throws KeeperException if a ZooKeeper operation fails<a name="line.164"></a> |
| <span class="sourceLineNo">165</span> * @throws IOException if the address of the ZooKeeper master cannot be retrieved<a name="line.165"></a> |
| <span class="sourceLineNo">166</span> */<a name="line.166"></a> |
| <span class="sourceLineNo">167</span> public static ServerName getMasterAddress(final ZKWatcher zkw)<a name="line.167"></a> |
| <span class="sourceLineNo">168</span> throws KeeperException, IOException {<a name="line.168"></a> |
| <span class="sourceLineNo">169</span> byte[] data;<a name="line.169"></a> |
| <span class="sourceLineNo">170</span> try {<a name="line.170"></a> |
| <span class="sourceLineNo">171</span> data = ZKUtil.getData(zkw, zkw.getZNodePaths().masterAddressZNode);<a name="line.171"></a> |
| <span class="sourceLineNo">172</span> } catch (InterruptedException e) {<a name="line.172"></a> |
| <span class="sourceLineNo">173</span> throw new InterruptedIOException();<a name="line.173"></a> |
| <span class="sourceLineNo">174</span> }<a name="line.174"></a> |
| <span class="sourceLineNo">175</span> // TODO javadoc claims we return null in this case. :/<a name="line.175"></a> |
| <span class="sourceLineNo">176</span> if (data == null) {<a name="line.176"></a> |
| <span class="sourceLineNo">177</span> throw new IOException("Can't get master address from ZooKeeper; znode data == null");<a name="line.177"></a> |
| <span class="sourceLineNo">178</span> }<a name="line.178"></a> |
| <span class="sourceLineNo">179</span> try {<a name="line.179"></a> |
| <span class="sourceLineNo">180</span> return ProtobufUtil.parseServerNameFrom(data);<a name="line.180"></a> |
| <span class="sourceLineNo">181</span> } catch (DeserializationException e) {<a name="line.181"></a> |
| <span class="sourceLineNo">182</span> KeeperException ke = new KeeperException.DataInconsistencyException();<a name="line.182"></a> |
| <span class="sourceLineNo">183</span> ke.initCause(e);<a name="line.183"></a> |
| <span class="sourceLineNo">184</span> throw ke;<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><a name="line.187"></a> |
| <span class="sourceLineNo">188</span> /**<a name="line.188"></a> |
| <span class="sourceLineNo">189</span> * Get master info port. Use this instead of {@link #getMasterInfoPort()} if you do not have an<a name="line.189"></a> |
| <span class="sourceLineNo">190</span> * instance of this tracker in your context.<a name="line.190"></a> |
| <span class="sourceLineNo">191</span> * @param zkw ZKWatcher to use<a name="line.191"></a> |
| <span class="sourceLineNo">192</span> * @return master info port in the the master address znode or null if no znode present. // TODO<a name="line.192"></a> |
| <span class="sourceLineNo">193</span> * can't return null for 'int' return type. non-static verison returns 0<a name="line.193"></a> |
| <span class="sourceLineNo">194</span> * @throws KeeperException if a ZooKeeper operation fails<a name="line.194"></a> |
| <span class="sourceLineNo">195</span> * @throws IOException if the address of the ZooKeeper master cannot be retrieved<a name="line.195"></a> |
| <span class="sourceLineNo">196</span> */<a name="line.196"></a> |
| <span class="sourceLineNo">197</span> public static int getMasterInfoPort(final ZKWatcher zkw) throws KeeperException, IOException {<a name="line.197"></a> |
| <span class="sourceLineNo">198</span> byte[] data;<a name="line.198"></a> |
| <span class="sourceLineNo">199</span> try {<a name="line.199"></a> |
| <span class="sourceLineNo">200</span> data = ZKUtil.getData(zkw, zkw.getZNodePaths().masterAddressZNode);<a name="line.200"></a> |
| <span class="sourceLineNo">201</span> } catch (InterruptedException e) {<a name="line.201"></a> |
| <span class="sourceLineNo">202</span> throw new InterruptedIOException();<a name="line.202"></a> |
| <span class="sourceLineNo">203</span> }<a name="line.203"></a> |
| <span class="sourceLineNo">204</span> // TODO javadoc claims we return null in this case. :/<a name="line.204"></a> |
| <span class="sourceLineNo">205</span> if (data == null) {<a name="line.205"></a> |
| <span class="sourceLineNo">206</span> throw new IOException("Can't get master address from ZooKeeper; znode data == null");<a name="line.206"></a> |
| <span class="sourceLineNo">207</span> }<a name="line.207"></a> |
| <span class="sourceLineNo">208</span> try {<a name="line.208"></a> |
| <span class="sourceLineNo">209</span> return parse(data).getInfoPort();<a name="line.209"></a> |
| <span class="sourceLineNo">210</span> } catch (DeserializationException e) {<a name="line.210"></a> |
| <span class="sourceLineNo">211</span> KeeperException ke = new KeeperException.DataInconsistencyException();<a name="line.211"></a> |
| <span class="sourceLineNo">212</span> ke.initCause(e);<a name="line.212"></a> |
| <span class="sourceLineNo">213</span> throw ke;<a name="line.213"></a> |
| <span class="sourceLineNo">214</span> }<a name="line.214"></a> |
| <span class="sourceLineNo">215</span> }<a name="line.215"></a> |
| <span class="sourceLineNo">216</span><a name="line.216"></a> |
| <span class="sourceLineNo">217</span> /**<a name="line.217"></a> |
| <span class="sourceLineNo">218</span> * Get backup master info port. Use this instead of {@link #getBackupMasterInfoPort(ServerName)}<a name="line.218"></a> |
| <span class="sourceLineNo">219</span> * if you do not have an instance of this tracker in your context.<a name="line.219"></a> |
| <span class="sourceLineNo">220</span> * @param zkw ZKWatcher to use<a name="line.220"></a> |
| <span class="sourceLineNo">221</span> * @param sn ServerName of the backup master<a name="line.221"></a> |
| <span class="sourceLineNo">222</span> * @return backup master info port in the the master address znode or 0 if no znode present.<a name="line.222"></a> |
| <span class="sourceLineNo">223</span> * @throws KeeperException if a ZooKeeper operation fails<a name="line.223"></a> |
| <span class="sourceLineNo">224</span> * @throws IOException if the address of the ZooKeeper master cannot be retrieved<a name="line.224"></a> |
| <span class="sourceLineNo">225</span> */<a name="line.225"></a> |
| <span class="sourceLineNo">226</span> public static int getBackupMasterInfoPort(ZKWatcher zkw, final ServerName sn)<a name="line.226"></a> |
| <span class="sourceLineNo">227</span> throws KeeperException, IOException {<a name="line.227"></a> |
| <span class="sourceLineNo">228</span> byte[] data;<a name="line.228"></a> |
| <span class="sourceLineNo">229</span> try {<a name="line.229"></a> |
| <span class="sourceLineNo">230</span> data = ZKUtil.getData(zkw,<a name="line.230"></a> |
| <span class="sourceLineNo">231</span> ZNodePaths.joinZNode(zkw.getZNodePaths().backupMasterAddressesZNode, sn.toString()));<a name="line.231"></a> |
| <span class="sourceLineNo">232</span> } catch (InterruptedException e) {<a name="line.232"></a> |
| <span class="sourceLineNo">233</span> throw new InterruptedIOException();<a name="line.233"></a> |
| <span class="sourceLineNo">234</span> }<a name="line.234"></a> |
| <span class="sourceLineNo">235</span> if (data == null) {<a name="line.235"></a> |
| <span class="sourceLineNo">236</span> throw new IOException("Can't get backup master address from ZooKeeper; znode data == null");<a name="line.236"></a> |
| <span class="sourceLineNo">237</span> }<a name="line.237"></a> |
| <span class="sourceLineNo">238</span> try {<a name="line.238"></a> |
| <span class="sourceLineNo">239</span> final ZooKeeperProtos.Master backup = parse(data);<a name="line.239"></a> |
| <span class="sourceLineNo">240</span> if (backup == null) {<a name="line.240"></a> |
| <span class="sourceLineNo">241</span> return 0;<a name="line.241"></a> |
| <span class="sourceLineNo">242</span> }<a name="line.242"></a> |
| <span class="sourceLineNo">243</span> return backup.getInfoPort();<a name="line.243"></a> |
| <span class="sourceLineNo">244</span> } catch (DeserializationException e) {<a name="line.244"></a> |
| <span class="sourceLineNo">245</span> KeeperException ke = new KeeperException.DataInconsistencyException();<a name="line.245"></a> |
| <span class="sourceLineNo">246</span> ke.initCause(e);<a name="line.246"></a> |
| <span class="sourceLineNo">247</span> throw ke;<a name="line.247"></a> |
| <span class="sourceLineNo">248</span> }<a name="line.248"></a> |
| <span class="sourceLineNo">249</span> }<a name="line.249"></a> |
| <span class="sourceLineNo">250</span><a name="line.250"></a> |
| <span class="sourceLineNo">251</span> /**<a name="line.251"></a> |
| <span class="sourceLineNo">252</span> * Set master address into the <code>master</code> znode or into the backup subdirectory of backup<a name="line.252"></a> |
| <span class="sourceLineNo">253</span> * masters; switch off the passed in <code>znode</code> path.<a name="line.253"></a> |
| <span class="sourceLineNo">254</span> * @param zkw The ZKWatcher to use.<a name="line.254"></a> |
| <span class="sourceLineNo">255</span> * @param znode Where to create the znode; could be at the top level or it could be under backup<a name="line.255"></a> |
| <span class="sourceLineNo">256</span> * masters<a name="line.256"></a> |
| <span class="sourceLineNo">257</span> * @param master ServerName of the current master must not be null.<a name="line.257"></a> |
| <span class="sourceLineNo">258</span> * @return true if node created, false if not; a watch is set in both cases<a name="line.258"></a> |
| <span class="sourceLineNo">259</span> * @throws KeeperException if a ZooKeeper operation fails<a name="line.259"></a> |
| <span class="sourceLineNo">260</span> */<a name="line.260"></a> |
| <span class="sourceLineNo">261</span> public static boolean setMasterAddress(final ZKWatcher zkw, final String znode,<a name="line.261"></a> |
| <span class="sourceLineNo">262</span> final ServerName master, int infoPort) throws KeeperException {<a name="line.262"></a> |
| <span class="sourceLineNo">263</span> return ZKUtil.createEphemeralNodeAndWatch(zkw, znode, toByteArray(master, infoPort));<a name="line.263"></a> |
| <span class="sourceLineNo">264</span> }<a name="line.264"></a> |
| <span class="sourceLineNo">265</span><a name="line.265"></a> |
| <span class="sourceLineNo">266</span> /**<a name="line.266"></a> |
| <span class="sourceLineNo">267</span> * Check if there is a master available.<a name="line.267"></a> |
| <span class="sourceLineNo">268</span> * @return true if there is a master set, false if not.<a name="line.268"></a> |
| <span class="sourceLineNo">269</span> */<a name="line.269"></a> |
| <span class="sourceLineNo">270</span> public boolean hasMaster() {<a name="line.270"></a> |
| <span class="sourceLineNo">271</span> return super.getData(false) != null;<a name="line.271"></a> |
| <span class="sourceLineNo">272</span> }<a name="line.272"></a> |
| <span class="sourceLineNo">273</span><a name="line.273"></a> |
| <span class="sourceLineNo">274</span> /**<a name="line.274"></a> |
| <span class="sourceLineNo">275</span> * @param sn must not be null<a name="line.275"></a> |
| <span class="sourceLineNo">276</span> * @return Content of the master znode as a serialized pb with the pb magic as prefix.<a name="line.276"></a> |
| <span class="sourceLineNo">277</span> */<a name="line.277"></a> |
| <span class="sourceLineNo">278</span> static byte[] toByteArray(final ServerName sn, int infoPort) {<a name="line.278"></a> |
| <span class="sourceLineNo">279</span> ZooKeeperProtos.Master.Builder mbuilder = ZooKeeperProtos.Master.newBuilder();<a name="line.279"></a> |
| <span class="sourceLineNo">280</span> HBaseProtos.ServerName.Builder snbuilder = HBaseProtos.ServerName.newBuilder();<a name="line.280"></a> |
| <span class="sourceLineNo">281</span> snbuilder.setHostName(sn.getHostname());<a name="line.281"></a> |
| <span class="sourceLineNo">282</span> snbuilder.setPort(sn.getPort());<a name="line.282"></a> |
| <span class="sourceLineNo">283</span> snbuilder.setStartCode(sn.getStartcode());<a name="line.283"></a> |
| <span class="sourceLineNo">284</span> mbuilder.setMaster(snbuilder.build());<a name="line.284"></a> |
| <span class="sourceLineNo">285</span> mbuilder.setRpcVersion(HConstants.RPC_CURRENT_VERSION);<a name="line.285"></a> |
| <span class="sourceLineNo">286</span> mbuilder.setInfoPort(infoPort);<a name="line.286"></a> |
| <span class="sourceLineNo">287</span> return ProtobufUtil.prependPBMagic(mbuilder.build().toByteArray());<a name="line.287"></a> |
| <span class="sourceLineNo">288</span> }<a name="line.288"></a> |
| <span class="sourceLineNo">289</span><a name="line.289"></a> |
| <span class="sourceLineNo">290</span> /**<a name="line.290"></a> |
| <span class="sourceLineNo">291</span> * @param data zookeeper data. may be null<a name="line.291"></a> |
| <span class="sourceLineNo">292</span> * @return pb object of master, null if no active master<a name="line.292"></a> |
| <span class="sourceLineNo">293</span> * @throws DeserializationException if the parsing fails<a name="line.293"></a> |
| <span class="sourceLineNo">294</span> */<a name="line.294"></a> |
| <span class="sourceLineNo">295</span> public static ZooKeeperProtos.Master parse(byte[] data) throws DeserializationException {<a name="line.295"></a> |
| <span class="sourceLineNo">296</span> if (data == null) {<a name="line.296"></a> |
| <span class="sourceLineNo">297</span> return null;<a name="line.297"></a> |
| <span class="sourceLineNo">298</span> }<a name="line.298"></a> |
| <span class="sourceLineNo">299</span> int prefixLen = ProtobufUtil.lengthOfPBMagic();<a name="line.299"></a> |
| <span class="sourceLineNo">300</span> try {<a name="line.300"></a> |
| <span class="sourceLineNo">301</span> return ZooKeeperProtos.Master.parser().parseFrom(data, prefixLen, data.length - prefixLen);<a name="line.301"></a> |
| <span class="sourceLineNo">302</span> } catch (InvalidProtocolBufferException e) {<a name="line.302"></a> |
| <span class="sourceLineNo">303</span> throw new DeserializationException(e);<a name="line.303"></a> |
| <span class="sourceLineNo">304</span> }<a name="line.304"></a> |
| <span class="sourceLineNo">305</span> }<a name="line.305"></a> |
| <span class="sourceLineNo">306</span><a name="line.306"></a> |
| <span class="sourceLineNo">307</span> /**<a name="line.307"></a> |
| <span class="sourceLineNo">308</span> * delete the master znode if its content is same as the parameter<a name="line.308"></a> |
| <span class="sourceLineNo">309</span> * @param zkw must not be null<a name="line.309"></a> |
| <span class="sourceLineNo">310</span> * @param content must not be null<a name="line.310"></a> |
| <span class="sourceLineNo">311</span> */<a name="line.311"></a> |
| <span class="sourceLineNo">312</span> public static boolean deleteIfEquals(ZKWatcher zkw, final String content) {<a name="line.312"></a> |
| <span class="sourceLineNo">313</span> if (content == null) {<a name="line.313"></a> |
| <span class="sourceLineNo">314</span> throw new IllegalArgumentException("Content must not be null");<a name="line.314"></a> |
| <span class="sourceLineNo">315</span> }<a name="line.315"></a> |
| <span class="sourceLineNo">316</span><a name="line.316"></a> |
| <span class="sourceLineNo">317</span> try {<a name="line.317"></a> |
| <span class="sourceLineNo">318</span> Stat stat = new Stat();<a name="line.318"></a> |
| <span class="sourceLineNo">319</span> byte[] data = ZKUtil.getDataNoWatch(zkw, zkw.getZNodePaths().masterAddressZNode, stat);<a name="line.319"></a> |
| <span class="sourceLineNo">320</span> ServerName sn = ProtobufUtil.parseServerNameFrom(data);<a name="line.320"></a> |
| <span class="sourceLineNo">321</span> if (sn != null && content.equals(sn.toString())) {<a name="line.321"></a> |
| <span class="sourceLineNo">322</span> return (ZKUtil.deleteNode(zkw, zkw.getZNodePaths().masterAddressZNode, stat.getVersion()));<a name="line.322"></a> |
| <span class="sourceLineNo">323</span> }<a name="line.323"></a> |
| <span class="sourceLineNo">324</span> } catch (KeeperException e) {<a name="line.324"></a> |
| <span class="sourceLineNo">325</span> LOG.warn("Can't get or delete the master znode", e);<a name="line.325"></a> |
| <span class="sourceLineNo">326</span> } catch (DeserializationException e) {<a name="line.326"></a> |
| <span class="sourceLineNo">327</span> LOG.warn("Can't get or delete the master znode", e);<a name="line.327"></a> |
| <span class="sourceLineNo">328</span> }<a name="line.328"></a> |
| <span class="sourceLineNo">329</span><a name="line.329"></a> |
| <span class="sourceLineNo">330</span> return false;<a name="line.330"></a> |
| <span class="sourceLineNo">331</span> }<a name="line.331"></a> |
| <span class="sourceLineNo">332</span><a name="line.332"></a> |
| <span class="sourceLineNo">333</span> public List<ServerName> getBackupMasters() {<a name="line.333"></a> |
| <span class="sourceLineNo">334</span> return backupMasters;<a name="line.334"></a> |
| <span class="sourceLineNo">335</span> }<a name="line.335"></a> |
| <span class="sourceLineNo">336</span><a name="line.336"></a> |
| <span class="sourceLineNo">337</span> /**<a name="line.337"></a> |
| <span class="sourceLineNo">338</span> * Retrieves the list of registered backup masters and renews a watch on the znode for children<a name="line.338"></a> |
| <span class="sourceLineNo">339</span> * updates.<a name="line.339"></a> |
| <span class="sourceLineNo">340</span> * @param zkw Zookeeper watcher to use<a name="line.340"></a> |
| <span class="sourceLineNo">341</span> * @return List of backup masters.<a name="line.341"></a> |
| <span class="sourceLineNo">342</span> * @throws InterruptedIOException if there is any issue fetching the required data from Zookeeper.<a name="line.342"></a> |
| <span class="sourceLineNo">343</span> */<a name="line.343"></a> |
| <span class="sourceLineNo">344</span> public static List<ServerName> getBackupMastersAndRenewWatch(ZKWatcher zkw)<a name="line.344"></a> |
| <span class="sourceLineNo">345</span> throws InterruptedIOException {<a name="line.345"></a> |
| <span class="sourceLineNo">346</span> // Build Set of backup masters from ZK nodes<a name="line.346"></a> |
| <span class="sourceLineNo">347</span> List<String> backupMasterStrings = null;<a name="line.347"></a> |
| <span class="sourceLineNo">348</span> try {<a name="line.348"></a> |
| <span class="sourceLineNo">349</span> backupMasterStrings = ZKUtil.listChildrenAndWatchForNewChildren(zkw,<a name="line.349"></a> |
| <span class="sourceLineNo">350</span> zkw.getZNodePaths().backupMasterAddressesZNode);<a name="line.350"></a> |
| <span class="sourceLineNo">351</span> } catch (KeeperException e) {<a name="line.351"></a> |
| <span class="sourceLineNo">352</span> LOG.warn(zkw.prefix("Unable to list backup servers"), e);<a name="line.352"></a> |
| <span class="sourceLineNo">353</span> }<a name="line.353"></a> |
| <span class="sourceLineNo">354</span><a name="line.354"></a> |
| <span class="sourceLineNo">355</span> List<ServerName> backupMasters = Collections.emptyList();<a name="line.355"></a> |
| <span class="sourceLineNo">356</span> if (backupMasterStrings != null && !backupMasterStrings.isEmpty()) {<a name="line.356"></a> |
| <span class="sourceLineNo">357</span> backupMasters = new ArrayList<>(backupMasterStrings.size());<a name="line.357"></a> |
| <span class="sourceLineNo">358</span> for (String s : backupMasterStrings) {<a name="line.358"></a> |
| <span class="sourceLineNo">359</span> try {<a name="line.359"></a> |
| <span class="sourceLineNo">360</span> byte[] bytes;<a name="line.360"></a> |
| <span class="sourceLineNo">361</span> try {<a name="line.361"></a> |
| <span class="sourceLineNo">362</span> bytes = ZKUtil.getData(zkw,<a name="line.362"></a> |
| <span class="sourceLineNo">363</span> ZNodePaths.joinZNode(zkw.getZNodePaths().backupMasterAddressesZNode, s));<a name="line.363"></a> |
| <span class="sourceLineNo">364</span> } catch (InterruptedException e) {<a name="line.364"></a> |
| <span class="sourceLineNo">365</span> throw new InterruptedIOException();<a name="line.365"></a> |
| <span class="sourceLineNo">366</span> }<a name="line.366"></a> |
| <span class="sourceLineNo">367</span> if (bytes != null) {<a name="line.367"></a> |
| <span class="sourceLineNo">368</span> ServerName sn;<a name="line.368"></a> |
| <span class="sourceLineNo">369</span> try {<a name="line.369"></a> |
| <span class="sourceLineNo">370</span> sn = ProtobufUtil.parseServerNameFrom(bytes);<a name="line.370"></a> |
| <span class="sourceLineNo">371</span> } catch (DeserializationException e) {<a name="line.371"></a> |
| <span class="sourceLineNo">372</span> LOG.warn("Failed parse, skipping registering backup server", e);<a name="line.372"></a> |
| <span class="sourceLineNo">373</span> continue;<a name="line.373"></a> |
| <span class="sourceLineNo">374</span> }<a name="line.374"></a> |
| <span class="sourceLineNo">375</span> backupMasters.add(sn);<a name="line.375"></a> |
| <span class="sourceLineNo">376</span> }<a name="line.376"></a> |
| <span class="sourceLineNo">377</span> } catch (KeeperException e) {<a name="line.377"></a> |
| <span class="sourceLineNo">378</span> LOG.warn(zkw.prefix("Unable to get information about " + "backup servers"), e);<a name="line.378"></a> |
| <span class="sourceLineNo">379</span> }<a name="line.379"></a> |
| <span class="sourceLineNo">380</span> }<a name="line.380"></a> |
| <span class="sourceLineNo">381</span> backupMasters.sort(Comparator.comparing(ServerName::getServerName));<a name="line.381"></a> |
| <span class="sourceLineNo">382</span> }<a name="line.382"></a> |
| <span class="sourceLineNo">383</span> return backupMasters;<a name="line.383"></a> |
| <span class="sourceLineNo">384</span> }<a name="line.384"></a> |
| <span class="sourceLineNo">385</span>}<a name="line.385"></a> |
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| </div> |
| </body> |
| </html> |
