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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 static org.junit.Assert.assertEquals;<a name="line.20"></a> |
| <span class="sourceLineNo">021</span>import static org.junit.Assert.assertNotNull;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import static org.junit.Assert.assertTrue;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import static org.junit.Assert.fail;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span><a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import java.util.concurrent.atomic.AtomicBoolean;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import org.apache.hadoop.conf.Configuration;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>import org.apache.hadoop.hbase.Abortable;<a name="line.27"></a> |
| <span class="sourceLineNo">028</span>import org.apache.hadoop.hbase.HBaseClassTestRule;<a name="line.28"></a> |
| <span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.HBaseConfiguration;<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.HBaseZKTestingUtil;<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.Stoppable;<a name="line.31"></a> |
| <span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.log.HBaseMarkers;<a name="line.32"></a> |
| <span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.testclassification.MediumTests;<a name="line.33"></a> |
| <span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.testclassification.ZKTests;<a name="line.34"></a> |
| <span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.35"></a> |
| <span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.util.Threads;<a name="line.36"></a> |
| <span class="sourceLineNo">037</span>import org.junit.AfterClass;<a name="line.37"></a> |
| <span class="sourceLineNo">038</span>import org.junit.BeforeClass;<a name="line.38"></a> |
| <span class="sourceLineNo">039</span>import org.junit.ClassRule;<a name="line.39"></a> |
| <span class="sourceLineNo">040</span>import org.junit.Test;<a name="line.40"></a> |
| <span class="sourceLineNo">041</span>import org.junit.experimental.categories.Category;<a name="line.41"></a> |
| <span class="sourceLineNo">042</span>import org.slf4j.Logger;<a name="line.42"></a> |
| <span class="sourceLineNo">043</span>import org.slf4j.LoggerFactory;<a name="line.43"></a> |
| <span class="sourceLineNo">044</span><a name="line.44"></a> |
| <span class="sourceLineNo">045</span>@Category({ ZKTests.class, MediumTests.class })<a name="line.45"></a> |
| <span class="sourceLineNo">046</span>public class TestZKLeaderManager {<a name="line.46"></a> |
| <span class="sourceLineNo">047</span><a name="line.47"></a> |
| <span class="sourceLineNo">048</span> @ClassRule<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> public static final HBaseClassTestRule CLASS_RULE =<a name="line.49"></a> |
| <span class="sourceLineNo">050</span> HBaseClassTestRule.forClass(TestZKLeaderManager.class);<a name="line.50"></a> |
| <span class="sourceLineNo">051</span><a name="line.51"></a> |
| <span class="sourceLineNo">052</span> private static final Logger LOG = LoggerFactory.getLogger(TestZKLeaderManager.class);<a name="line.52"></a> |
| <span class="sourceLineNo">053</span><a name="line.53"></a> |
| <span class="sourceLineNo">054</span> private static final String LEADER_ZNODE = "/test/" + TestZKLeaderManager.class.getSimpleName();<a name="line.54"></a> |
| <span class="sourceLineNo">055</span><a name="line.55"></a> |
| <span class="sourceLineNo">056</span> private static class MockAbortable implements Abortable {<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> private boolean aborted;<a name="line.57"></a> |
| <span class="sourceLineNo">058</span><a name="line.58"></a> |
| <span class="sourceLineNo">059</span> @Override<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> public void abort(String why, Throwable e) {<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> aborted = true;<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> LOG.error(HBaseMarkers.FATAL, "Aborting during test: " + why, e);<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> fail("Aborted during test: " + why);<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> @Override<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> public boolean isAborted() {<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> return aborted;<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> }<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> }<a name="line.70"></a> |
| <span class="sourceLineNo">071</span><a name="line.71"></a> |
| <span class="sourceLineNo">072</span> private static class MockLeader extends Thread implements Stoppable {<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> private volatile boolean stopped;<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> private ZKWatcher watcher;<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> private ZKLeaderManager zkLeader;<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> private AtomicBoolean master = new AtomicBoolean(false);<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> private int index;<a name="line.77"></a> |
| <span class="sourceLineNo">078</span><a name="line.78"></a> |
| <span class="sourceLineNo">079</span> MockLeader(ZKWatcher watcher, int index) {<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> setDaemon(true);<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> setName("TestZKLeaderManager-leader-" + index);<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> this.index = index;<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> this.watcher = watcher;<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> this.zkLeader = new ZKLeaderManager(watcher, LEADER_ZNODE, Bytes.toBytes(index), this);<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> }<a name="line.85"></a> |
| <span class="sourceLineNo">086</span><a name="line.86"></a> |
| <span class="sourceLineNo">087</span> public boolean isMaster() {<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> return master.get();<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> public int getIndex() {<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> return index;<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> public ZKWatcher getWatcher() {<a name="line.95"></a> |
| <span class="sourceLineNo">096</span> return watcher;<a name="line.96"></a> |
| <span class="sourceLineNo">097</span> }<a name="line.97"></a> |
| <span class="sourceLineNo">098</span><a name="line.98"></a> |
| <span class="sourceLineNo">099</span> @Override<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> public void run() {<a name="line.100"></a> |
| <span class="sourceLineNo">101</span> while (!stopped) {<a name="line.101"></a> |
| <span class="sourceLineNo">102</span> zkLeader.start();<a name="line.102"></a> |
| <span class="sourceLineNo">103</span> zkLeader.waitToBecomeLeader();<a name="line.103"></a> |
| <span class="sourceLineNo">104</span> master.set(true);<a name="line.104"></a> |
| <span class="sourceLineNo">105</span><a name="line.105"></a> |
| <span class="sourceLineNo">106</span> while (master.get() && !stopped) {<a name="line.106"></a> |
| <span class="sourceLineNo">107</span> try {<a name="line.107"></a> |
| <span class="sourceLineNo">108</span> Thread.sleep(10);<a name="line.108"></a> |
| <span class="sourceLineNo">109</span> } catch (InterruptedException ignored) {<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> }<a name="line.112"></a> |
| <span class="sourceLineNo">113</span> }<a name="line.113"></a> |
| <span class="sourceLineNo">114</span><a name="line.114"></a> |
| <span class="sourceLineNo">115</span> void abdicate() {<a name="line.115"></a> |
| <span class="sourceLineNo">116</span> zkLeader.stepDownAsLeader();<a name="line.116"></a> |
| <span class="sourceLineNo">117</span> master.set(false);<a name="line.117"></a> |
| <span class="sourceLineNo">118</span> }<a name="line.118"></a> |
| <span class="sourceLineNo">119</span><a name="line.119"></a> |
| <span class="sourceLineNo">120</span> @Override<a name="line.120"></a> |
| <span class="sourceLineNo">121</span> public void stop(String why) {<a name="line.121"></a> |
| <span class="sourceLineNo">122</span> stopped = true;<a name="line.122"></a> |
| <span class="sourceLineNo">123</span> abdicate();<a name="line.123"></a> |
| <span class="sourceLineNo">124</span> Threads.sleep(100);<a name="line.124"></a> |
| <span class="sourceLineNo">125</span> watcher.close();<a name="line.125"></a> |
| <span class="sourceLineNo">126</span> }<a name="line.126"></a> |
| <span class="sourceLineNo">127</span><a name="line.127"></a> |
| <span class="sourceLineNo">128</span> @Override<a name="line.128"></a> |
| <span class="sourceLineNo">129</span> public boolean isStopped() {<a name="line.129"></a> |
| <span class="sourceLineNo">130</span> return stopped;<a name="line.130"></a> |
| <span class="sourceLineNo">131</span> }<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> private static HBaseZKTestingUtil TEST_UTIL;<a name="line.134"></a> |
| <span class="sourceLineNo">135</span> private static MockLeader[] CANDIDATES;<a name="line.135"></a> |
| <span class="sourceLineNo">136</span><a name="line.136"></a> |
| <span class="sourceLineNo">137</span> @BeforeClass<a name="line.137"></a> |
| <span class="sourceLineNo">138</span> public static void setupBeforeClass() throws Exception {<a name="line.138"></a> |
| <span class="sourceLineNo">139</span> TEST_UTIL = new HBaseZKTestingUtil();<a name="line.139"></a> |
| <span class="sourceLineNo">140</span> TEST_UTIL.startMiniZKCluster();<a name="line.140"></a> |
| <span class="sourceLineNo">141</span> Configuration conf = TEST_UTIL.getConfiguration();<a name="line.141"></a> |
| <span class="sourceLineNo">142</span><a name="line.142"></a> |
| <span class="sourceLineNo">143</span> // use an abortable to fail the test in the case of any KeeperExceptions<a name="line.143"></a> |
| <span class="sourceLineNo">144</span> MockAbortable abortable = new MockAbortable();<a name="line.144"></a> |
| <span class="sourceLineNo">145</span> int count = 5;<a name="line.145"></a> |
| <span class="sourceLineNo">146</span> CANDIDATES = new MockLeader[count];<a name="line.146"></a> |
| <span class="sourceLineNo">147</span> for (int i = 0; i < count; i++) {<a name="line.147"></a> |
| <span class="sourceLineNo">148</span> ZKWatcher watcher = newZK(conf, "server" + i, abortable);<a name="line.148"></a> |
| <span class="sourceLineNo">149</span> CANDIDATES[i] = new MockLeader(watcher, i);<a name="line.149"></a> |
| <span class="sourceLineNo">150</span> CANDIDATES[i].start();<a name="line.150"></a> |
| <span class="sourceLineNo">151</span> }<a name="line.151"></a> |
| <span class="sourceLineNo">152</span> }<a name="line.152"></a> |
| <span class="sourceLineNo">153</span><a name="line.153"></a> |
| <span class="sourceLineNo">154</span> @AfterClass<a name="line.154"></a> |
| <span class="sourceLineNo">155</span> public static void tearDownAfterClass() throws Exception {<a name="line.155"></a> |
| <span class="sourceLineNo">156</span> TEST_UTIL.shutdownMiniZKCluster();<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> @Test<a name="line.159"></a> |
| <span class="sourceLineNo">160</span> public void testLeaderSelection() throws Exception {<a name="line.160"></a> |
| <span class="sourceLineNo">161</span> MockLeader currentLeader = getCurrentLeader();<a name="line.161"></a> |
| <span class="sourceLineNo">162</span> // one leader should have been found<a name="line.162"></a> |
| <span class="sourceLineNo">163</span> assertNotNull("Leader should exist", currentLeader);<a name="line.163"></a> |
| <span class="sourceLineNo">164</span> LOG.debug("Current leader index is " + currentLeader.getIndex());<a name="line.164"></a> |
| <span class="sourceLineNo">165</span><a name="line.165"></a> |
| <span class="sourceLineNo">166</span> byte[] znodeData = ZKUtil.getData(currentLeader.getWatcher(), LEADER_ZNODE);<a name="line.166"></a> |
| <span class="sourceLineNo">167</span> assertNotNull("Leader znode should contain leader index", znodeData);<a name="line.167"></a> |
| <span class="sourceLineNo">168</span> assertTrue("Leader znode should not be empty", znodeData.length > 0);<a name="line.168"></a> |
| <span class="sourceLineNo">169</span> int storedIndex = Bytes.toInt(znodeData);<a name="line.169"></a> |
| <span class="sourceLineNo">170</span> LOG.debug("Stored leader index in ZK is " + storedIndex);<a name="line.170"></a> |
| <span class="sourceLineNo">171</span> assertEquals("Leader znode should match leader index", currentLeader.getIndex(), storedIndex);<a name="line.171"></a> |
| <span class="sourceLineNo">172</span><a name="line.172"></a> |
| <span class="sourceLineNo">173</span> // force a leader transition<a name="line.173"></a> |
| <span class="sourceLineNo">174</span> currentLeader.abdicate();<a name="line.174"></a> |
| <span class="sourceLineNo">175</span><a name="line.175"></a> |
| <span class="sourceLineNo">176</span> // check for new leader<a name="line.176"></a> |
| <span class="sourceLineNo">177</span> currentLeader = getCurrentLeader();<a name="line.177"></a> |
| <span class="sourceLineNo">178</span> // one leader should have been found<a name="line.178"></a> |
| <span class="sourceLineNo">179</span> assertNotNull("New leader should exist after abdication", currentLeader);<a name="line.179"></a> |
| <span class="sourceLineNo">180</span> LOG.debug("New leader index is " + currentLeader.getIndex());<a name="line.180"></a> |
| <span class="sourceLineNo">181</span><a name="line.181"></a> |
| <span class="sourceLineNo">182</span> znodeData = ZKUtil.getData(currentLeader.getWatcher(), LEADER_ZNODE);<a name="line.182"></a> |
| <span class="sourceLineNo">183</span> assertNotNull("Leader znode should contain leader index", znodeData);<a name="line.183"></a> |
| <span class="sourceLineNo">184</span> assertTrue("Leader znode should not be empty", znodeData.length > 0);<a name="line.184"></a> |
| <span class="sourceLineNo">185</span> storedIndex = Bytes.toInt(znodeData);<a name="line.185"></a> |
| <span class="sourceLineNo">186</span> LOG.debug("Stored leader index in ZK is " + storedIndex);<a name="line.186"></a> |
| <span class="sourceLineNo">187</span> assertEquals("Leader znode should match leader index", currentLeader.getIndex(), storedIndex);<a name="line.187"></a> |
| <span class="sourceLineNo">188</span><a name="line.188"></a> |
| <span class="sourceLineNo">189</span> // force another transition by stopping the current<a name="line.189"></a> |
| <span class="sourceLineNo">190</span> currentLeader.stop("Stopping for test");<a name="line.190"></a> |
| <span class="sourceLineNo">191</span><a name="line.191"></a> |
| <span class="sourceLineNo">192</span> // check for new leader<a name="line.192"></a> |
| <span class="sourceLineNo">193</span> currentLeader = getCurrentLeader();<a name="line.193"></a> |
| <span class="sourceLineNo">194</span> // one leader should have been found<a name="line.194"></a> |
| <span class="sourceLineNo">195</span> assertNotNull("New leader should exist after stop", currentLeader);<a name="line.195"></a> |
| <span class="sourceLineNo">196</span> LOG.debug("New leader index is " + currentLeader.getIndex());<a name="line.196"></a> |
| <span class="sourceLineNo">197</span><a name="line.197"></a> |
| <span class="sourceLineNo">198</span> znodeData = ZKUtil.getData(currentLeader.getWatcher(), LEADER_ZNODE);<a name="line.198"></a> |
| <span class="sourceLineNo">199</span> assertNotNull("Leader znode should contain leader index", znodeData);<a name="line.199"></a> |
| <span class="sourceLineNo">200</span> assertTrue("Leader znode should not be empty", znodeData.length > 0);<a name="line.200"></a> |
| <span class="sourceLineNo">201</span> storedIndex = Bytes.toInt(znodeData);<a name="line.201"></a> |
| <span class="sourceLineNo">202</span> LOG.debug("Stored leader index in ZK is " + storedIndex);<a name="line.202"></a> |
| <span class="sourceLineNo">203</span> assertEquals("Leader znode should match leader index", currentLeader.getIndex(), storedIndex);<a name="line.203"></a> |
| <span class="sourceLineNo">204</span><a name="line.204"></a> |
| <span class="sourceLineNo">205</span> // with a second stop we can guarantee that a previous leader has resumed leading<a name="line.205"></a> |
| <span class="sourceLineNo">206</span> currentLeader.stop("Stopping for test");<a name="line.206"></a> |
| <span class="sourceLineNo">207</span><a name="line.207"></a> |
| <span class="sourceLineNo">208</span> // check for new<a name="line.208"></a> |
| <span class="sourceLineNo">209</span> currentLeader = getCurrentLeader();<a name="line.209"></a> |
| <span class="sourceLineNo">210</span> assertNotNull("New leader should exist", currentLeader);<a name="line.210"></a> |
| <span class="sourceLineNo">211</span> }<a name="line.211"></a> |
| <span class="sourceLineNo">212</span><a name="line.212"></a> |
| <span class="sourceLineNo">213</span> private MockLeader getCurrentLeader() {<a name="line.213"></a> |
| <span class="sourceLineNo">214</span> MockLeader currentLeader = null;<a name="line.214"></a> |
| <span class="sourceLineNo">215</span><a name="line.215"></a> |
| <span class="sourceLineNo">216</span> // Wait up to 10 secs for initial leader<a name="line.216"></a> |
| <span class="sourceLineNo">217</span> for (int i = 0; i < 1000; i++) {<a name="line.217"></a> |
| <span class="sourceLineNo">218</span> for (int j = 0; j < CANDIDATES.length; j++) {<a name="line.218"></a> |
| <span class="sourceLineNo">219</span> if (CANDIDATES[j].isMaster()) {<a name="line.219"></a> |
| <span class="sourceLineNo">220</span> // should only be one leader<a name="line.220"></a> |
| <span class="sourceLineNo">221</span> if (currentLeader != null) {<a name="line.221"></a> |
| <span class="sourceLineNo">222</span> fail(<a name="line.222"></a> |
| <span class="sourceLineNo">223</span> "Both candidate " + currentLeader.getIndex() + " and " + j + " claim to be leader!");<a name="line.223"></a> |
| <span class="sourceLineNo">224</span> }<a name="line.224"></a> |
| <span class="sourceLineNo">225</span> currentLeader = CANDIDATES[j];<a name="line.225"></a> |
| <span class="sourceLineNo">226</span> }<a name="line.226"></a> |
| <span class="sourceLineNo">227</span> }<a name="line.227"></a> |
| <span class="sourceLineNo">228</span> if (currentLeader != null) {<a name="line.228"></a> |
| <span class="sourceLineNo">229</span> break;<a name="line.229"></a> |
| <span class="sourceLineNo">230</span> }<a name="line.230"></a> |
| <span class="sourceLineNo">231</span> Threads.sleep(100);<a name="line.231"></a> |
| <span class="sourceLineNo">232</span> }<a name="line.232"></a> |
| <span class="sourceLineNo">233</span> return currentLeader;<a name="line.233"></a> |
| <span class="sourceLineNo">234</span> }<a name="line.234"></a> |
| <span class="sourceLineNo">235</span><a name="line.235"></a> |
| <span class="sourceLineNo">236</span> private static ZKWatcher newZK(Configuration conf, String name, Abortable abort)<a name="line.236"></a> |
| <span class="sourceLineNo">237</span> throws Exception {<a name="line.237"></a> |
| <span class="sourceLineNo">238</span> Configuration copy = HBaseConfiguration.create(conf);<a name="line.238"></a> |
| <span class="sourceLineNo">239</span> return new ZKWatcher(copy, name, abort);<a name="line.239"></a> |
| <span class="sourceLineNo">240</span> }<a name="line.240"></a> |
| <span class="sourceLineNo">241</span>}<a name="line.241"></a> |
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| </pre> |
| </div> |
| </body> |
| </html> |
