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| <pre><span class="source-line-no">001</span><span id="line-1">/*</span> |
| <span class="source-line-no">002</span><span id="line-2"> * Licensed to the Apache Software Foundation (ASF) under one</span> |
| <span class="source-line-no">003</span><span id="line-3"> * or more contributor license agreements. See the NOTICE file</span> |
| <span class="source-line-no">004</span><span id="line-4"> * distributed with this work for additional information</span> |
| <span class="source-line-no">005</span><span id="line-5"> * regarding copyright ownership. The ASF licenses this file</span> |
| <span class="source-line-no">006</span><span id="line-6"> * to you under the Apache License, Version 2.0 (the</span> |
| <span class="source-line-no">007</span><span id="line-7"> * "License"); you may not use this file except in compliance</span> |
| <span class="source-line-no">008</span><span id="line-8"> * with the License. You may obtain a copy of the License at</span> |
| <span class="source-line-no">009</span><span id="line-9"> *</span> |
| <span class="source-line-no">010</span><span id="line-10"> * http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="source-line-no">011</span><span id="line-11"> *</span> |
| <span class="source-line-no">012</span><span id="line-12"> * Unless required by applicable law or agreed to in writing, software</span> |
| <span class="source-line-no">013</span><span id="line-13"> * distributed under the License is distributed on an "AS IS" BASIS,</span> |
| <span class="source-line-no">014</span><span id="line-14"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span> |
| <span class="source-line-no">015</span><span id="line-15"> * See the License for the specific language governing permissions and</span> |
| <span class="source-line-no">016</span><span id="line-16"> * limitations under the License.</span> |
| <span class="source-line-no">017</span><span id="line-17"> */</span> |
| <span class="source-line-no">018</span><span id="line-18">package org.apache.hadoop.hbase.zookeeper;</span> |
| <span class="source-line-no">019</span><span id="line-19"></span> |
| <span class="source-line-no">020</span><span id="line-20">import static org.junit.Assert.assertEquals;</span> |
| <span class="source-line-no">021</span><span id="line-21">import static org.junit.Assert.assertNotNull;</span> |
| <span class="source-line-no">022</span><span id="line-22">import static org.junit.Assert.assertTrue;</span> |
| <span class="source-line-no">023</span><span id="line-23">import static org.junit.Assert.fail;</span> |
| <span class="source-line-no">024</span><span id="line-24"></span> |
| <span class="source-line-no">025</span><span id="line-25">import java.util.concurrent.atomic.AtomicBoolean;</span> |
| <span class="source-line-no">026</span><span id="line-26">import org.apache.hadoop.conf.Configuration;</span> |
| <span class="source-line-no">027</span><span id="line-27">import org.apache.hadoop.hbase.Abortable;</span> |
| <span class="source-line-no">028</span><span id="line-28">import org.apache.hadoop.hbase.HBaseClassTestRule;</span> |
| <span class="source-line-no">029</span><span id="line-29">import org.apache.hadoop.hbase.HBaseConfiguration;</span> |
| <span class="source-line-no">030</span><span id="line-30">import org.apache.hadoop.hbase.HBaseZKTestingUtil;</span> |
| <span class="source-line-no">031</span><span id="line-31">import org.apache.hadoop.hbase.Stoppable;</span> |
| <span class="source-line-no">032</span><span id="line-32">import org.apache.hadoop.hbase.log.HBaseMarkers;</span> |
| <span class="source-line-no">033</span><span id="line-33">import org.apache.hadoop.hbase.testclassification.MediumTests;</span> |
| <span class="source-line-no">034</span><span id="line-34">import org.apache.hadoop.hbase.testclassification.ZKTests;</span> |
| <span class="source-line-no">035</span><span id="line-35">import org.apache.hadoop.hbase.util.Bytes;</span> |
| <span class="source-line-no">036</span><span id="line-36">import org.apache.hadoop.hbase.util.Threads;</span> |
| <span class="source-line-no">037</span><span id="line-37">import org.junit.AfterClass;</span> |
| <span class="source-line-no">038</span><span id="line-38">import org.junit.BeforeClass;</span> |
| <span class="source-line-no">039</span><span id="line-39">import org.junit.ClassRule;</span> |
| <span class="source-line-no">040</span><span id="line-40">import org.junit.Test;</span> |
| <span class="source-line-no">041</span><span id="line-41">import org.junit.experimental.categories.Category;</span> |
| <span class="source-line-no">042</span><span id="line-42">import org.slf4j.Logger;</span> |
| <span class="source-line-no">043</span><span id="line-43">import org.slf4j.LoggerFactory;</span> |
| <span class="source-line-no">044</span><span id="line-44"></span> |
| <span class="source-line-no">045</span><span id="line-45">@Category({ ZKTests.class, MediumTests.class })</span> |
| <span class="source-line-no">046</span><span id="line-46">public class TestZKLeaderManager {</span> |
| <span class="source-line-no">047</span><span id="line-47"></span> |
| <span class="source-line-no">048</span><span id="line-48"> @ClassRule</span> |
| <span class="source-line-no">049</span><span id="line-49"> public static final HBaseClassTestRule CLASS_RULE =</span> |
| <span class="source-line-no">050</span><span id="line-50"> HBaseClassTestRule.forClass(TestZKLeaderManager.class);</span> |
| <span class="source-line-no">051</span><span id="line-51"></span> |
| <span class="source-line-no">052</span><span id="line-52"> private static final Logger LOG = LoggerFactory.getLogger(TestZKLeaderManager.class);</span> |
| <span class="source-line-no">053</span><span id="line-53"></span> |
| <span class="source-line-no">054</span><span id="line-54"> private static final String LEADER_ZNODE = "/test/" + TestZKLeaderManager.class.getSimpleName();</span> |
| <span class="source-line-no">055</span><span id="line-55"></span> |
| <span class="source-line-no">056</span><span id="line-56"> private static class MockAbortable implements Abortable {</span> |
| <span class="source-line-no">057</span><span id="line-57"> private boolean aborted;</span> |
| <span class="source-line-no">058</span><span id="line-58"></span> |
| <span class="source-line-no">059</span><span id="line-59"> @Override</span> |
| <span class="source-line-no">060</span><span id="line-60"> public void abort(String why, Throwable e) {</span> |
| <span class="source-line-no">061</span><span id="line-61"> aborted = true;</span> |
| <span class="source-line-no">062</span><span id="line-62"> LOG.error(HBaseMarkers.FATAL, "Aborting during test: " + why, e);</span> |
| <span class="source-line-no">063</span><span id="line-63"> fail("Aborted during test: " + why);</span> |
| <span class="source-line-no">064</span><span id="line-64"> }</span> |
| <span class="source-line-no">065</span><span id="line-65"></span> |
| <span class="source-line-no">066</span><span id="line-66"> @Override</span> |
| <span class="source-line-no">067</span><span id="line-67"> public boolean isAborted() {</span> |
| <span class="source-line-no">068</span><span id="line-68"> return aborted;</span> |
| <span class="source-line-no">069</span><span id="line-69"> }</span> |
| <span class="source-line-no">070</span><span id="line-70"> }</span> |
| <span class="source-line-no">071</span><span id="line-71"></span> |
| <span class="source-line-no">072</span><span id="line-72"> private static class MockLeader extends Thread implements Stoppable {</span> |
| <span class="source-line-no">073</span><span id="line-73"> private volatile boolean stopped;</span> |
| <span class="source-line-no">074</span><span id="line-74"> private ZKWatcher watcher;</span> |
| <span class="source-line-no">075</span><span id="line-75"> private ZKLeaderManager zkLeader;</span> |
| <span class="source-line-no">076</span><span id="line-76"> private AtomicBoolean master = new AtomicBoolean(false);</span> |
| <span class="source-line-no">077</span><span id="line-77"> private int index;</span> |
| <span class="source-line-no">078</span><span id="line-78"></span> |
| <span class="source-line-no">079</span><span id="line-79"> MockLeader(ZKWatcher watcher, int index) {</span> |
| <span class="source-line-no">080</span><span id="line-80"> setDaemon(true);</span> |
| <span class="source-line-no">081</span><span id="line-81"> setName("TestZKLeaderManager-leader-" + index);</span> |
| <span class="source-line-no">082</span><span id="line-82"> this.index = index;</span> |
| <span class="source-line-no">083</span><span id="line-83"> this.watcher = watcher;</span> |
| <span class="source-line-no">084</span><span id="line-84"> this.zkLeader = new ZKLeaderManager(watcher, LEADER_ZNODE, Bytes.toBytes(index), this);</span> |
| <span class="source-line-no">085</span><span id="line-85"> }</span> |
| <span class="source-line-no">086</span><span id="line-86"></span> |
| <span class="source-line-no">087</span><span id="line-87"> public boolean isMaster() {</span> |
| <span class="source-line-no">088</span><span id="line-88"> return master.get();</span> |
| <span class="source-line-no">089</span><span id="line-89"> }</span> |
| <span class="source-line-no">090</span><span id="line-90"></span> |
| <span class="source-line-no">091</span><span id="line-91"> public int getIndex() {</span> |
| <span class="source-line-no">092</span><span id="line-92"> return index;</span> |
| <span class="source-line-no">093</span><span id="line-93"> }</span> |
| <span class="source-line-no">094</span><span id="line-94"></span> |
| <span class="source-line-no">095</span><span id="line-95"> public ZKWatcher getWatcher() {</span> |
| <span class="source-line-no">096</span><span id="line-96"> return watcher;</span> |
| <span class="source-line-no">097</span><span id="line-97"> }</span> |
| <span class="source-line-no">098</span><span id="line-98"></span> |
| <span class="source-line-no">099</span><span id="line-99"> @Override</span> |
| <span class="source-line-no">100</span><span id="line-100"> public void run() {</span> |
| <span class="source-line-no">101</span><span id="line-101"> while (!stopped) {</span> |
| <span class="source-line-no">102</span><span id="line-102"> zkLeader.start();</span> |
| <span class="source-line-no">103</span><span id="line-103"> zkLeader.waitToBecomeLeader();</span> |
| <span class="source-line-no">104</span><span id="line-104"> master.set(true);</span> |
| <span class="source-line-no">105</span><span id="line-105"></span> |
| <span class="source-line-no">106</span><span id="line-106"> while (master.get() && !stopped) {</span> |
| <span class="source-line-no">107</span><span id="line-107"> try {</span> |
| <span class="source-line-no">108</span><span id="line-108"> Thread.sleep(10);</span> |
| <span class="source-line-no">109</span><span id="line-109"> } catch (InterruptedException ignored) {</span> |
| <span class="source-line-no">110</span><span id="line-110"> }</span> |
| <span class="source-line-no">111</span><span id="line-111"> }</span> |
| <span class="source-line-no">112</span><span id="line-112"> }</span> |
| <span class="source-line-no">113</span><span id="line-113"> }</span> |
| <span class="source-line-no">114</span><span id="line-114"></span> |
| <span class="source-line-no">115</span><span id="line-115"> void abdicate() {</span> |
| <span class="source-line-no">116</span><span id="line-116"> zkLeader.stepDownAsLeader();</span> |
| <span class="source-line-no">117</span><span id="line-117"> master.set(false);</span> |
| <span class="source-line-no">118</span><span id="line-118"> }</span> |
| <span class="source-line-no">119</span><span id="line-119"></span> |
| <span class="source-line-no">120</span><span id="line-120"> @Override</span> |
| <span class="source-line-no">121</span><span id="line-121"> public void stop(String why) {</span> |
| <span class="source-line-no">122</span><span id="line-122"> stopped = true;</span> |
| <span class="source-line-no">123</span><span id="line-123"> abdicate();</span> |
| <span class="source-line-no">124</span><span id="line-124"> Threads.sleep(100);</span> |
| <span class="source-line-no">125</span><span id="line-125"> watcher.close();</span> |
| <span class="source-line-no">126</span><span id="line-126"> }</span> |
| <span class="source-line-no">127</span><span id="line-127"></span> |
| <span class="source-line-no">128</span><span id="line-128"> @Override</span> |
| <span class="source-line-no">129</span><span id="line-129"> public boolean isStopped() {</span> |
| <span class="source-line-no">130</span><span id="line-130"> return stopped;</span> |
| <span class="source-line-no">131</span><span id="line-131"> }</span> |
| <span class="source-line-no">132</span><span id="line-132"> }</span> |
| <span class="source-line-no">133</span><span id="line-133"></span> |
| <span class="source-line-no">134</span><span id="line-134"> private static HBaseZKTestingUtil TEST_UTIL;</span> |
| <span class="source-line-no">135</span><span id="line-135"> private static MockLeader[] CANDIDATES;</span> |
| <span class="source-line-no">136</span><span id="line-136"></span> |
| <span class="source-line-no">137</span><span id="line-137"> @BeforeClass</span> |
| <span class="source-line-no">138</span><span id="line-138"> public static void setupBeforeClass() throws Exception {</span> |
| <span class="source-line-no">139</span><span id="line-139"> TEST_UTIL = new HBaseZKTestingUtil();</span> |
| <span class="source-line-no">140</span><span id="line-140"> TEST_UTIL.startMiniZKCluster();</span> |
| <span class="source-line-no">141</span><span id="line-141"> Configuration conf = TEST_UTIL.getConfiguration();</span> |
| <span class="source-line-no">142</span><span id="line-142"></span> |
| <span class="source-line-no">143</span><span id="line-143"> // use an abortable to fail the test in the case of any KeeperExceptions</span> |
| <span class="source-line-no">144</span><span id="line-144"> MockAbortable abortable = new MockAbortable();</span> |
| <span class="source-line-no">145</span><span id="line-145"> int count = 5;</span> |
| <span class="source-line-no">146</span><span id="line-146"> CANDIDATES = new MockLeader[count];</span> |
| <span class="source-line-no">147</span><span id="line-147"> for (int i = 0; i < count; i++) {</span> |
| <span class="source-line-no">148</span><span id="line-148"> ZKWatcher watcher = newZK(conf, "server" + i, abortable);</span> |
| <span class="source-line-no">149</span><span id="line-149"> CANDIDATES[i] = new MockLeader(watcher, i);</span> |
| <span class="source-line-no">150</span><span id="line-150"> CANDIDATES[i].start();</span> |
| <span class="source-line-no">151</span><span id="line-151"> }</span> |
| <span class="source-line-no">152</span><span id="line-152"> }</span> |
| <span class="source-line-no">153</span><span id="line-153"></span> |
| <span class="source-line-no">154</span><span id="line-154"> @AfterClass</span> |
| <span class="source-line-no">155</span><span id="line-155"> public static void tearDownAfterClass() throws Exception {</span> |
| <span class="source-line-no">156</span><span id="line-156"> TEST_UTIL.shutdownMiniZKCluster();</span> |
| <span class="source-line-no">157</span><span id="line-157"> }</span> |
| <span class="source-line-no">158</span><span id="line-158"></span> |
| <span class="source-line-no">159</span><span id="line-159"> @Test</span> |
| <span class="source-line-no">160</span><span id="line-160"> public void testLeaderSelection() throws Exception {</span> |
| <span class="source-line-no">161</span><span id="line-161"> MockLeader currentLeader = getCurrentLeader();</span> |
| <span class="source-line-no">162</span><span id="line-162"> // one leader should have been found</span> |
| <span class="source-line-no">163</span><span id="line-163"> assertNotNull("Leader should exist", currentLeader);</span> |
| <span class="source-line-no">164</span><span id="line-164"> LOG.debug("Current leader index is " + currentLeader.getIndex());</span> |
| <span class="source-line-no">165</span><span id="line-165"></span> |
| <span class="source-line-no">166</span><span id="line-166"> byte[] znodeData = ZKUtil.getData(currentLeader.getWatcher(), LEADER_ZNODE);</span> |
| <span class="source-line-no">167</span><span id="line-167"> assertNotNull("Leader znode should contain leader index", znodeData);</span> |
| <span class="source-line-no">168</span><span id="line-168"> assertTrue("Leader znode should not be empty", znodeData.length > 0);</span> |
| <span class="source-line-no">169</span><span id="line-169"> int storedIndex = Bytes.toInt(znodeData);</span> |
| <span class="source-line-no">170</span><span id="line-170"> LOG.debug("Stored leader index in ZK is " + storedIndex);</span> |
| <span class="source-line-no">171</span><span id="line-171"> assertEquals("Leader znode should match leader index", currentLeader.getIndex(), storedIndex);</span> |
| <span class="source-line-no">172</span><span id="line-172"></span> |
| <span class="source-line-no">173</span><span id="line-173"> // force a leader transition</span> |
| <span class="source-line-no">174</span><span id="line-174"> currentLeader.abdicate();</span> |
| <span class="source-line-no">175</span><span id="line-175"></span> |
| <span class="source-line-no">176</span><span id="line-176"> // check for new leader</span> |
| <span class="source-line-no">177</span><span id="line-177"> currentLeader = getCurrentLeader();</span> |
| <span class="source-line-no">178</span><span id="line-178"> // one leader should have been found</span> |
| <span class="source-line-no">179</span><span id="line-179"> assertNotNull("New leader should exist after abdication", currentLeader);</span> |
| <span class="source-line-no">180</span><span id="line-180"> LOG.debug("New leader index is " + currentLeader.getIndex());</span> |
| <span class="source-line-no">181</span><span id="line-181"></span> |
| <span class="source-line-no">182</span><span id="line-182"> znodeData = ZKUtil.getData(currentLeader.getWatcher(), LEADER_ZNODE);</span> |
| <span class="source-line-no">183</span><span id="line-183"> assertNotNull("Leader znode should contain leader index", znodeData);</span> |
| <span class="source-line-no">184</span><span id="line-184"> assertTrue("Leader znode should not be empty", znodeData.length > 0);</span> |
| <span class="source-line-no">185</span><span id="line-185"> storedIndex = Bytes.toInt(znodeData);</span> |
| <span class="source-line-no">186</span><span id="line-186"> LOG.debug("Stored leader index in ZK is " + storedIndex);</span> |
| <span class="source-line-no">187</span><span id="line-187"> assertEquals("Leader znode should match leader index", currentLeader.getIndex(), storedIndex);</span> |
| <span class="source-line-no">188</span><span id="line-188"></span> |
| <span class="source-line-no">189</span><span id="line-189"> // force another transition by stopping the current</span> |
| <span class="source-line-no">190</span><span id="line-190"> currentLeader.stop("Stopping for test");</span> |
| <span class="source-line-no">191</span><span id="line-191"></span> |
| <span class="source-line-no">192</span><span id="line-192"> // check for new leader</span> |
| <span class="source-line-no">193</span><span id="line-193"> currentLeader = getCurrentLeader();</span> |
| <span class="source-line-no">194</span><span id="line-194"> // one leader should have been found</span> |
| <span class="source-line-no">195</span><span id="line-195"> assertNotNull("New leader should exist after stop", currentLeader);</span> |
| <span class="source-line-no">196</span><span id="line-196"> LOG.debug("New leader index is " + currentLeader.getIndex());</span> |
| <span class="source-line-no">197</span><span id="line-197"></span> |
| <span class="source-line-no">198</span><span id="line-198"> znodeData = ZKUtil.getData(currentLeader.getWatcher(), LEADER_ZNODE);</span> |
| <span class="source-line-no">199</span><span id="line-199"> assertNotNull("Leader znode should contain leader index", znodeData);</span> |
| <span class="source-line-no">200</span><span id="line-200"> assertTrue("Leader znode should not be empty", znodeData.length > 0);</span> |
| <span class="source-line-no">201</span><span id="line-201"> storedIndex = Bytes.toInt(znodeData);</span> |
| <span class="source-line-no">202</span><span id="line-202"> LOG.debug("Stored leader index in ZK is " + storedIndex);</span> |
| <span class="source-line-no">203</span><span id="line-203"> assertEquals("Leader znode should match leader index", currentLeader.getIndex(), storedIndex);</span> |
| <span class="source-line-no">204</span><span id="line-204"></span> |
| <span class="source-line-no">205</span><span id="line-205"> // with a second stop we can guarantee that a previous leader has resumed leading</span> |
| <span class="source-line-no">206</span><span id="line-206"> currentLeader.stop("Stopping for test");</span> |
| <span class="source-line-no">207</span><span id="line-207"></span> |
| <span class="source-line-no">208</span><span id="line-208"> // check for new</span> |
| <span class="source-line-no">209</span><span id="line-209"> currentLeader = getCurrentLeader();</span> |
| <span class="source-line-no">210</span><span id="line-210"> assertNotNull("New leader should exist", currentLeader);</span> |
| <span class="source-line-no">211</span><span id="line-211"> }</span> |
| <span class="source-line-no">212</span><span id="line-212"></span> |
| <span class="source-line-no">213</span><span id="line-213"> private MockLeader getCurrentLeader() {</span> |
| <span class="source-line-no">214</span><span id="line-214"> MockLeader currentLeader = null;</span> |
| <span class="source-line-no">215</span><span id="line-215"></span> |
| <span class="source-line-no">216</span><span id="line-216"> // Wait up to 10 secs for initial leader</span> |
| <span class="source-line-no">217</span><span id="line-217"> for (int i = 0; i < 1000; i++) {</span> |
| <span class="source-line-no">218</span><span id="line-218"> for (int j = 0; j < CANDIDATES.length; j++) {</span> |
| <span class="source-line-no">219</span><span id="line-219"> if (CANDIDATES[j].isMaster()) {</span> |
| <span class="source-line-no">220</span><span id="line-220"> // should only be one leader</span> |
| <span class="source-line-no">221</span><span id="line-221"> if (currentLeader != null) {</span> |
| <span class="source-line-no">222</span><span id="line-222"> fail(</span> |
| <span class="source-line-no">223</span><span id="line-223"> "Both candidate " + currentLeader.getIndex() + " and " + j + " claim to be leader!");</span> |
| <span class="source-line-no">224</span><span id="line-224"> }</span> |
| <span class="source-line-no">225</span><span id="line-225"> currentLeader = CANDIDATES[j];</span> |
| <span class="source-line-no">226</span><span id="line-226"> }</span> |
| <span class="source-line-no">227</span><span id="line-227"> }</span> |
| <span class="source-line-no">228</span><span id="line-228"> if (currentLeader != null) {</span> |
| <span class="source-line-no">229</span><span id="line-229"> break;</span> |
| <span class="source-line-no">230</span><span id="line-230"> }</span> |
| <span class="source-line-no">231</span><span id="line-231"> Threads.sleep(100);</span> |
| <span class="source-line-no">232</span><span id="line-232"> }</span> |
| <span class="source-line-no">233</span><span id="line-233"> return currentLeader;</span> |
| <span class="source-line-no">234</span><span id="line-234"> }</span> |
| <span class="source-line-no">235</span><span id="line-235"></span> |
| <span class="source-line-no">236</span><span id="line-236"> private static ZKWatcher newZK(Configuration conf, String name, Abortable abort)</span> |
| <span class="source-line-no">237</span><span id="line-237"> throws Exception {</span> |
| <span class="source-line-no">238</span><span id="line-238"> Configuration copy = HBaseConfiguration.create(conf);</span> |
| <span class="source-line-no">239</span><span id="line-239"> return new ZKWatcher(copy, name, abort);</span> |
| <span class="source-line-no">240</span><span id="line-240"> }</span> |
| <span class="source-line-no">241</span><span id="line-241">}</span> |
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| </pre> |
| </div> |
| </main> |
| </body> |
| </html> |
