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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;</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 java.io.IOException;</span> |
| <span class="source-line-no">021</span><span id="line-21">import java.nio.charset.StandardCharsets;</span> |
| <span class="source-line-no">022</span><span id="line-22">import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;</span> |
| <span class="source-line-no">023</span><span id="line-23">import org.apache.hadoop.hbase.util.Threads;</span> |
| <span class="source-line-no">024</span><span id="line-24">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">025</span><span id="line-25">import org.apache.zookeeper.AsyncCallback;</span> |
| <span class="source-line-no">026</span><span id="line-26">import org.apache.zookeeper.CreateMode;</span> |
| <span class="source-line-no">027</span><span id="line-27">import org.apache.zookeeper.KeeperException;</span> |
| <span class="source-line-no">028</span><span id="line-28">import org.apache.zookeeper.WatchedEvent;</span> |
| <span class="source-line-no">029</span><span id="line-29">import org.apache.zookeeper.Watcher;</span> |
| <span class="source-line-no">030</span><span id="line-30">import org.apache.zookeeper.ZooDefs;</span> |
| <span class="source-line-no">031</span><span id="line-31">import org.apache.zookeeper.ZooKeeper;</span> |
| <span class="source-line-no">032</span><span id="line-32">import org.slf4j.Logger;</span> |
| <span class="source-line-no">033</span><span id="line-33">import org.slf4j.LoggerFactory;</span> |
| <span class="source-line-no">034</span><span id="line-34"></span> |
| <span class="source-line-no">035</span><span id="line-35">@InterfaceAudience.Private</span> |
| <span class="source-line-no">036</span><span id="line-36">public class ChaosZKClient {</span> |
| <span class="source-line-no">037</span><span id="line-37"></span> |
| <span class="source-line-no">038</span><span id="line-38"> private static final Logger LOG = LoggerFactory.getLogger(ChaosZKClient.class.getName());</span> |
| <span class="source-line-no">039</span><span id="line-39"> private static final String CHAOS_AGENT_PARENT_ZNODE = "/hbase/chaosAgents";</span> |
| <span class="source-line-no">040</span><span id="line-40"> private static final String CHAOS_AGENT_STATUS_ZNODE = "/hbase/chaosAgentTaskStatus";</span> |
| <span class="source-line-no">041</span><span id="line-41"> private static final String ZNODE_PATH_SEPARATOR = "/";</span> |
| <span class="source-line-no">042</span><span id="line-42"> private static final String TASK_PREFIX = "task_";</span> |
| <span class="source-line-no">043</span><span id="line-43"> private static final String TASK_ERROR_STRING = "error";</span> |
| <span class="source-line-no">044</span><span id="line-44"> private static final String TASK_COMPLETION_STRING = "done";</span> |
| <span class="source-line-no">045</span><span id="line-45"> private static final String TASK_BOOLEAN_TRUE = "true";</span> |
| <span class="source-line-no">046</span><span id="line-46"> private static final String TASK_BOOLEAN_FALSE = "false";</span> |
| <span class="source-line-no">047</span><span id="line-47"> private static final String CONNECTION_LOSS = "ConnectionLoss";</span> |
| <span class="source-line-no">048</span><span id="line-48"> private static final int SESSION_TIMEOUT_ZK = 10 * 60 * 1000;</span> |
| <span class="source-line-no">049</span><span id="line-49"> private static final int TASK_EXECUTION_TIMEOUT = 5 * 60 * 1000;</span> |
| <span class="source-line-no">050</span><span id="line-50"> private volatile String taskStatus = null;</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 final String quorum;</span> |
| <span class="source-line-no">053</span><span id="line-53"> private ZooKeeper zk;</span> |
| <span class="source-line-no">054</span><span id="line-54"></span> |
| <span class="source-line-no">055</span><span id="line-55"> public ChaosZKClient(String quorum) {</span> |
| <span class="source-line-no">056</span><span id="line-56"> this.quorum = quorum;</span> |
| <span class="source-line-no">057</span><span id="line-57"> try {</span> |
| <span class="source-line-no">058</span><span id="line-58"> this.createNewZKConnection();</span> |
| <span class="source-line-no">059</span><span id="line-59"> } catch (IOException e) {</span> |
| <span class="source-line-no">060</span><span id="line-60"> LOG.error("Error creating ZooKeeper Connection: ", e);</span> |
| <span class="source-line-no">061</span><span id="line-61"> }</span> |
| <span class="source-line-no">062</span><span id="line-62"> }</span> |
| <span class="source-line-no">063</span><span id="line-63"></span> |
| <span class="source-line-no">064</span><span id="line-64"> /**</span> |
| <span class="source-line-no">065</span><span id="line-65"> * Creates connection with ZooKeeper</span> |
| <span class="source-line-no">066</span><span id="line-66"> * @throws IOException when not able to create connection properly</span> |
| <span class="source-line-no">067</span><span id="line-67"> */</span> |
| <span class="source-line-no">068</span><span id="line-68"> public void createNewZKConnection() throws IOException {</span> |
| <span class="source-line-no">069</span><span id="line-69"> Watcher watcher = new Watcher() {</span> |
| <span class="source-line-no">070</span><span id="line-70"> @Override</span> |
| <span class="source-line-no">071</span><span id="line-71"> public void process(WatchedEvent watchedEvent) {</span> |
| <span class="source-line-no">072</span><span id="line-72"> LOG.info("Created ZooKeeper Connection For executing task");</span> |
| <span class="source-line-no">073</span><span id="line-73"> }</span> |
| <span class="source-line-no">074</span><span id="line-74"> };</span> |
| <span class="source-line-no">075</span><span id="line-75"></span> |
| <span class="source-line-no">076</span><span id="line-76"> this.zk = new ZooKeeper(quorum, SESSION_TIMEOUT_ZK, watcher);</span> |
| <span class="source-line-no">077</span><span id="line-77"> }</span> |
| <span class="source-line-no">078</span><span id="line-78"></span> |
| <span class="source-line-no">079</span><span id="line-79"> /**</span> |
| <span class="source-line-no">080</span><span id="line-80"> * Checks if ChaosAgent is running or not on target host by checking its ZNode.</span> |
| <span class="source-line-no">081</span><span id="line-81"> * @param hostname hostname to check for chaosagent</span> |
| <span class="source-line-no">082</span><span id="line-82"> * @return true/false whether agent is running or not</span> |
| <span class="source-line-no">083</span><span id="line-83"> */</span> |
| <span class="source-line-no">084</span><span id="line-84"> private boolean isChaosAgentRunning(String hostname) {</span> |
| <span class="source-line-no">085</span><span id="line-85"> try {</span> |
| <span class="source-line-no">086</span><span id="line-86"> return zk.exists(CHAOS_AGENT_PARENT_ZNODE + ZNODE_PATH_SEPARATOR + hostname, false) != null;</span> |
| <span class="source-line-no">087</span><span id="line-87"> } catch (KeeperException e) {</span> |
| <span class="source-line-no">088</span><span id="line-88"> if (e.toString().contains(CONNECTION_LOSS)) {</span> |
| <span class="source-line-no">089</span><span id="line-89"> recreateZKConnection();</span> |
| <span class="source-line-no">090</span><span id="line-90"> try {</span> |
| <span class="source-line-no">091</span><span id="line-91"> return zk.exists(CHAOS_AGENT_PARENT_ZNODE + ZNODE_PATH_SEPARATOR + hostname, false)</span> |
| <span class="source-line-no">092</span><span id="line-92"> != null;</span> |
| <span class="source-line-no">093</span><span id="line-93"> } catch (KeeperException | InterruptedException ie) {</span> |
| <span class="source-line-no">094</span><span id="line-94"> LOG.error("ERROR ", ie);</span> |
| <span class="source-line-no">095</span><span id="line-95"> }</span> |
| <span class="source-line-no">096</span><span id="line-96"> }</span> |
| <span class="source-line-no">097</span><span id="line-97"> } catch (InterruptedException e) {</span> |
| <span class="source-line-no">098</span><span id="line-98"> LOG.error("Error checking for given hostname: {} ERROR: ", hostname, e);</span> |
| <span class="source-line-no">099</span><span id="line-99"> }</span> |
| <span class="source-line-no">100</span><span id="line-100"> return false;</span> |
| <span class="source-line-no">101</span><span id="line-101"> }</span> |
| <span class="source-line-no">102</span><span id="line-102"></span> |
| <span class="source-line-no">103</span><span id="line-103"> /**</span> |
| <span class="source-line-no">104</span><span id="line-104"> * Creates tasks for target hosts by creating ZNodes. Waits for a limited amount of time to</span> |
| <span class="source-line-no">105</span><span id="line-105"> * complete task to execute.</span> |
| <span class="source-line-no">106</span><span id="line-106"> * @param taskObject Object data represents command</span> |
| <span class="source-line-no">107</span><span id="line-107"> * @return returns status</span> |
| <span class="source-line-no">108</span><span id="line-108"> */</span> |
| <span class="source-line-no">109</span><span id="line-109"> public String submitTask(final TaskObject taskObject) {</span> |
| <span class="source-line-no">110</span><span id="line-110"> if (isChaosAgentRunning(taskObject.getTaskHostname())) {</span> |
| <span class="source-line-no">111</span><span id="line-111"> LOG.info("Creating task node");</span> |
| <span class="source-line-no">112</span><span id="line-112"> zk.create(</span> |
| <span class="source-line-no">113</span><span id="line-113"> CHAOS_AGENT_STATUS_ZNODE + ZNODE_PATH_SEPARATOR + taskObject.getTaskHostname()</span> |
| <span class="source-line-no">114</span><span id="line-114"> + ZNODE_PATH_SEPARATOR + TASK_PREFIX,</span> |
| <span class="source-line-no">115</span><span id="line-115"> taskObject.getCommand().getBytes(StandardCharsets.UTF_8), ZooDefs.Ids.OPEN_ACL_UNSAFE,</span> |
| <span class="source-line-no">116</span><span id="line-116"> CreateMode.EPHEMERAL_SEQUENTIAL, submitTaskCallback, taskObject);</span> |
| <span class="source-line-no">117</span><span id="line-117"> long start = EnvironmentEdgeManager.currentTime();</span> |
| <span class="source-line-no">118</span><span id="line-118"></span> |
| <span class="source-line-no">119</span><span id="line-119"> while ((EnvironmentEdgeManager.currentTime() - start) < TASK_EXECUTION_TIMEOUT) {</span> |
| <span class="source-line-no">120</span><span id="line-120"> if (taskStatus != null) {</span> |
| <span class="source-line-no">121</span><span id="line-121"> return taskStatus;</span> |
| <span class="source-line-no">122</span><span id="line-122"> }</span> |
| <span class="source-line-no">123</span><span id="line-123"> Threads.sleep(500);</span> |
| <span class="source-line-no">124</span><span id="line-124"> }</span> |
| <span class="source-line-no">125</span><span id="line-125"> } else {</span> |
| <span class="source-line-no">126</span><span id="line-126"> LOG.info("EHHHHH! ChaosAgent Not running");</span> |
| <span class="source-line-no">127</span><span id="line-127"> }</span> |
| <span class="source-line-no">128</span><span id="line-128"> return TASK_ERROR_STRING;</span> |
| <span class="source-line-no">129</span><span id="line-129"> }</span> |
| <span class="source-line-no">130</span><span id="line-130"></span> |
| <span class="source-line-no">131</span><span id="line-131"> /**</span> |
| <span class="source-line-no">132</span><span id="line-132"> * To get status of task submitted</span> |
| <span class="source-line-no">133</span><span id="line-133"> * @param path path at which to get status</span> |
| <span class="source-line-no">134</span><span id="line-134"> * @param ctx path context</span> |
| <span class="source-line-no">135</span><span id="line-135"> */</span> |
| <span class="source-line-no">136</span><span id="line-136"> private void getStatus(String path, Object ctx) {</span> |
| <span class="source-line-no">137</span><span id="line-137"> LOG.info("Getting Status of task: " + path);</span> |
| <span class="source-line-no">138</span><span id="line-138"> zk.getData(path, false, getStatusCallback, ctx);</span> |
| <span class="source-line-no">139</span><span id="line-139"> }</span> |
| <span class="source-line-no">140</span><span id="line-140"></span> |
| <span class="source-line-no">141</span><span id="line-141"> /**</span> |
| <span class="source-line-no">142</span><span id="line-142"> * Set a watch on task submitted</span> |
| <span class="source-line-no">143</span><span id="line-143"> * @param name ZNode name to set a watch</span> |
| <span class="source-line-no">144</span><span id="line-144"> * @param taskObject context for ZNode name</span> |
| <span class="source-line-no">145</span><span id="line-145"> */</span> |
| <span class="source-line-no">146</span><span id="line-146"> private void setStatusWatch(String name, TaskObject taskObject) {</span> |
| <span class="source-line-no">147</span><span id="line-147"> LOG.info("Checking for ZNode and Setting watch for task : " + name);</span> |
| <span class="source-line-no">148</span><span id="line-148"> zk.exists(name, setStatusWatcher, setStatusWatchCallback, taskObject);</span> |
| <span class="source-line-no">149</span><span id="line-149"> }</span> |
| <span class="source-line-no">150</span><span id="line-150"></span> |
| <span class="source-line-no">151</span><span id="line-151"> /**</span> |
| <span class="source-line-no">152</span><span id="line-152"> * Delete task after getting its status</span> |
| <span class="source-line-no">153</span><span id="line-153"> * @param path path to delete ZNode</span> |
| <span class="source-line-no">154</span><span id="line-154"> */</span> |
| <span class="source-line-no">155</span><span id="line-155"> private void deleteTask(String path) {</span> |
| <span class="source-line-no">156</span><span id="line-156"> LOG.info("Deleting task: " + path);</span> |
| <span class="source-line-no">157</span><span id="line-157"> zk.delete(path, -1, taskDeleteCallback, null);</span> |
| <span class="source-line-no">158</span><span id="line-158"> }</span> |
| <span class="source-line-no">159</span><span id="line-159"></span> |
| <span class="source-line-no">160</span><span id="line-160"> // WATCHERS:</span> |
| <span class="source-line-no">161</span><span id="line-161"></span> |
| <span class="source-line-no">162</span><span id="line-162"> /**</span> |
| <span class="source-line-no">163</span><span id="line-163"> * Watcher to get notification whenever status of task changes.</span> |
| <span class="source-line-no">164</span><span id="line-164"> */</span> |
| <span class="source-line-no">165</span><span id="line-165"> Watcher setStatusWatcher = new Watcher() {</span> |
| <span class="source-line-no">166</span><span id="line-166"> @Override</span> |
| <span class="source-line-no">167</span><span id="line-167"> public void process(WatchedEvent watchedEvent) {</span> |
| <span class="source-line-no">168</span><span id="line-168"> LOG.info("Setting status watch for task: " + watchedEvent.getPath());</span> |
| <span class="source-line-no">169</span><span id="line-169"> if (watchedEvent.getType() == Event.EventType.NodeDataChanged) {</span> |
| <span class="source-line-no">170</span><span id="line-170"> if (!watchedEvent.getPath().contains(TASK_PREFIX)) {</span> |
| <span class="source-line-no">171</span><span id="line-171"> throw new RuntimeException(</span> |
| <span class="source-line-no">172</span><span id="line-172"> KeeperException.create(KeeperException.Code.DATAINCONSISTENCY));</span> |
| <span class="source-line-no">173</span><span id="line-173"> }</span> |
| <span class="source-line-no">174</span><span id="line-174"> getStatus(watchedEvent.getPath(), (Object) watchedEvent.getPath());</span> |
| <span class="source-line-no">175</span><span id="line-175"></span> |
| <span class="source-line-no">176</span><span id="line-176"> }</span> |
| <span class="source-line-no">177</span><span id="line-177"> }</span> |
| <span class="source-line-no">178</span><span id="line-178"> };</span> |
| <span class="source-line-no">179</span><span id="line-179"></span> |
| <span class="source-line-no">180</span><span id="line-180"> // CALLBACKS</span> |
| <span class="source-line-no">181</span><span id="line-181"></span> |
| <span class="source-line-no">182</span><span id="line-182"> AsyncCallback.DataCallback getStatusCallback = (rc, path, ctx, data, stat) -> {</span> |
| <span class="source-line-no">183</span><span id="line-183"> switch (KeeperException.Code.get(rc)) {</span> |
| <span class="source-line-no">184</span><span id="line-184"> case CONNECTIONLOSS:</span> |
| <span class="source-line-no">185</span><span id="line-185"> // Connectionloss while getting status of task, getting again</span> |
| <span class="source-line-no">186</span><span id="line-186"> recreateZKConnection();</span> |
| <span class="source-line-no">187</span><span id="line-187"> getStatus(path, ctx);</span> |
| <span class="source-line-no">188</span><span id="line-188"> break;</span> |
| <span class="source-line-no">189</span><span id="line-189"></span> |
| <span class="source-line-no">190</span><span id="line-190"> case OK:</span> |
| <span class="source-line-no">191</span><span id="line-191"> if (ctx != null) {</span> |
| <span class="source-line-no">192</span><span id="line-192"></span> |
| <span class="source-line-no">193</span><span id="line-193"> String status = new String(data, StandardCharsets.UTF_8);</span> |
| <span class="source-line-no">194</span><span id="line-194"> taskStatus = status;</span> |
| <span class="source-line-no">195</span><span id="line-195"> switch (status) {</span> |
| <span class="source-line-no">196</span><span id="line-196"> case TASK_COMPLETION_STRING:</span> |
| <span class="source-line-no">197</span><span id="line-197"> case TASK_BOOLEAN_TRUE:</span> |
| <span class="source-line-no">198</span><span id="line-198"> case TASK_BOOLEAN_FALSE:</span> |
| <span class="source-line-no">199</span><span id="line-199"> LOG.info("Task executed completely : Status --> " + status);</span> |
| <span class="source-line-no">200</span><span id="line-200"> break;</span> |
| <span class="source-line-no">201</span><span id="line-201"></span> |
| <span class="source-line-no">202</span><span id="line-202"> case TASK_ERROR_STRING:</span> |
| <span class="source-line-no">203</span><span id="line-203"> LOG.info("There was error while executing task : Status --> " + status);</span> |
| <span class="source-line-no">204</span><span id="line-204"> break;</span> |
| <span class="source-line-no">205</span><span id="line-205"></span> |
| <span class="source-line-no">206</span><span id="line-206"> default:</span> |
| <span class="source-line-no">207</span><span id="line-207"> LOG.warn("Status of task is undefined!! : Status --> " + status);</span> |
| <span class="source-line-no">208</span><span id="line-208"> }</span> |
| <span class="source-line-no">209</span><span id="line-209"></span> |
| <span class="source-line-no">210</span><span id="line-210"> deleteTask(path);</span> |
| <span class="source-line-no">211</span><span id="line-211"> }</span> |
| <span class="source-line-no">212</span><span id="line-212"> break;</span> |
| <span class="source-line-no">213</span><span id="line-213"></span> |
| <span class="source-line-no">214</span><span id="line-214"> default:</span> |
| <span class="source-line-no">215</span><span id="line-215"> LOG.error("ERROR while getting status of task: " + path + " ERROR: "</span> |
| <span class="source-line-no">216</span><span id="line-216"> + KeeperException.create(KeeperException.Code.get(rc)));</span> |
| <span class="source-line-no">217</span><span id="line-217"> }</span> |
| <span class="source-line-no">218</span><span id="line-218"> };</span> |
| <span class="source-line-no">219</span><span id="line-219"></span> |
| <span class="source-line-no">220</span><span id="line-220"> AsyncCallback.StatCallback setStatusWatchCallback = (rc, path, ctx, stat) -> {</span> |
| <span class="source-line-no">221</span><span id="line-221"> switch (KeeperException.Code.get(rc)) {</span> |
| <span class="source-line-no">222</span><span id="line-222"> case CONNECTIONLOSS:</span> |
| <span class="source-line-no">223</span><span id="line-223"> // ConnectionLoss while setting watch on status ZNode, setting again.</span> |
| <span class="source-line-no">224</span><span id="line-224"> recreateZKConnection();</span> |
| <span class="source-line-no">225</span><span id="line-225"> setStatusWatch(path, (TaskObject) ctx);</span> |
| <span class="source-line-no">226</span><span id="line-226"> break;</span> |
| <span class="source-line-no">227</span><span id="line-227"></span> |
| <span class="source-line-no">228</span><span id="line-228"> case OK:</span> |
| <span class="source-line-no">229</span><span id="line-229"> if (stat != null) {</span> |
| <span class="source-line-no">230</span><span id="line-230"> getStatus(path, null);</span> |
| <span class="source-line-no">231</span><span id="line-231"> }</span> |
| <span class="source-line-no">232</span><span id="line-232"> break;</span> |
| <span class="source-line-no">233</span><span id="line-233"></span> |
| <span class="source-line-no">234</span><span id="line-234"> default:</span> |
| <span class="source-line-no">235</span><span id="line-235"> LOG.error("ERROR while setting watch on task ZNode: " + path + " ERROR: "</span> |
| <span class="source-line-no">236</span><span id="line-236"> + KeeperException.create(KeeperException.Code.get(rc)));</span> |
| <span class="source-line-no">237</span><span id="line-237"> }</span> |
| <span class="source-line-no">238</span><span id="line-238"> };</span> |
| <span class="source-line-no">239</span><span id="line-239"></span> |
| <span class="source-line-no">240</span><span id="line-240"> AsyncCallback.StringCallback submitTaskCallback = (rc, path, ctx, name) -> {</span> |
| <span class="source-line-no">241</span><span id="line-241"> switch (KeeperException.Code.get(rc)) {</span> |
| <span class="source-line-no">242</span><span id="line-242"> case CONNECTIONLOSS:</span> |
| <span class="source-line-no">243</span><span id="line-243"> // Connection to server was lost while submitting task, submitting again.</span> |
| <span class="source-line-no">244</span><span id="line-244"> recreateZKConnection();</span> |
| <span class="source-line-no">245</span><span id="line-245"> submitTask((TaskObject) ctx);</span> |
| <span class="source-line-no">246</span><span id="line-246"> break;</span> |
| <span class="source-line-no">247</span><span id="line-247"></span> |
| <span class="source-line-no">248</span><span id="line-248"> case OK:</span> |
| <span class="source-line-no">249</span><span id="line-249"> LOG.info("Task created : " + name);</span> |
| <span class="source-line-no">250</span><span id="line-250"> setStatusWatch(name, (TaskObject) ctx);</span> |
| <span class="source-line-no">251</span><span id="line-251"> break;</span> |
| <span class="source-line-no">252</span><span id="line-252"></span> |
| <span class="source-line-no">253</span><span id="line-253"> default:</span> |
| <span class="source-line-no">254</span><span id="line-254"> LOG.error("Error submitting task: " + name + " ERROR:"</span> |
| <span class="source-line-no">255</span><span id="line-255"> + KeeperException.create(KeeperException.Code.get(rc)));</span> |
| <span class="source-line-no">256</span><span id="line-256"> }</span> |
| <span class="source-line-no">257</span><span id="line-257"> };</span> |
| <span class="source-line-no">258</span><span id="line-258"></span> |
| <span class="source-line-no">259</span><span id="line-259"> AsyncCallback.VoidCallback taskDeleteCallback = new AsyncCallback.VoidCallback() {</span> |
| <span class="source-line-no">260</span><span id="line-260"> @Override</span> |
| <span class="source-line-no">261</span><span id="line-261"> public void processResult(int rc, String path, Object ctx) {</span> |
| <span class="source-line-no">262</span><span id="line-262"> switch (KeeperException.Code.get(rc)) {</span> |
| <span class="source-line-no">263</span><span id="line-263"> case CONNECTIONLOSS:</span> |
| <span class="source-line-no">264</span><span id="line-264"> // Connectionloss while deleting task, deleting again</span> |
| <span class="source-line-no">265</span><span id="line-265"> recreateZKConnection();</span> |
| <span class="source-line-no">266</span><span id="line-266"> deleteTask(path);</span> |
| <span class="source-line-no">267</span><span id="line-267"> break;</span> |
| <span class="source-line-no">268</span><span id="line-268"></span> |
| <span class="source-line-no">269</span><span id="line-269"> case OK:</span> |
| <span class="source-line-no">270</span><span id="line-270"> LOG.info("Task Deleted successfully!");</span> |
| <span class="source-line-no">271</span><span id="line-271"> LOG.info("Closing ZooKeeper Connection");</span> |
| <span class="source-line-no">272</span><span id="line-272"> try {</span> |
| <span class="source-line-no">273</span><span id="line-273"> zk.close();</span> |
| <span class="source-line-no">274</span><span id="line-274"> } catch (InterruptedException e) {</span> |
| <span class="source-line-no">275</span><span id="line-275"> LOG.error("Error while closing ZooKeeper Connection.");</span> |
| <span class="source-line-no">276</span><span id="line-276"> }</span> |
| <span class="source-line-no">277</span><span id="line-277"> break;</span> |
| <span class="source-line-no">278</span><span id="line-278"></span> |
| <span class="source-line-no">279</span><span id="line-279"> default:</span> |
| <span class="source-line-no">280</span><span id="line-280"> LOG.error("ERROR while deleting task: " + path + " ERROR: "</span> |
| <span class="source-line-no">281</span><span id="line-281"> + KeeperException.create(KeeperException.Code.get(rc)));</span> |
| <span class="source-line-no">282</span><span id="line-282"> }</span> |
| <span class="source-line-no">283</span><span id="line-283"> }</span> |
| <span class="source-line-no">284</span><span id="line-284"> };</span> |
| <span class="source-line-no">285</span><span id="line-285"></span> |
| <span class="source-line-no">286</span><span id="line-286"> private void recreateZKConnection() {</span> |
| <span class="source-line-no">287</span><span id="line-287"> try {</span> |
| <span class="source-line-no">288</span><span id="line-288"> zk.close();</span> |
| <span class="source-line-no">289</span><span id="line-289"> } catch (InterruptedException e) {</span> |
| <span class="source-line-no">290</span><span id="line-290"> LOG.error("Error closing ZK connection : ", e);</span> |
| <span class="source-line-no">291</span><span id="line-291"> } finally {</span> |
| <span class="source-line-no">292</span><span id="line-292"> try {</span> |
| <span class="source-line-no">293</span><span id="line-293"> createNewZKConnection();</span> |
| <span class="source-line-no">294</span><span id="line-294"> } catch (IOException e) {</span> |
| <span class="source-line-no">295</span><span id="line-295"> LOG.error("Error creating new ZK COnnection for agent: ", e);</span> |
| <span class="source-line-no">296</span><span id="line-296"> }</span> |
| <span class="source-line-no">297</span><span id="line-297"> }</span> |
| <span class="source-line-no">298</span><span id="line-298"> }</span> |
| <span class="source-line-no">299</span><span id="line-299"></span> |
| <span class="source-line-no">300</span><span id="line-300"> static class TaskObject {</span> |
| <span class="source-line-no">301</span><span id="line-301"> private final String command;</span> |
| <span class="source-line-no">302</span><span id="line-302"> private final String taskHostname;</span> |
| <span class="source-line-no">303</span><span id="line-303"></span> |
| <span class="source-line-no">304</span><span id="line-304"> public TaskObject(String command, String taskHostname) {</span> |
| <span class="source-line-no">305</span><span id="line-305"> this.command = command;</span> |
| <span class="source-line-no">306</span><span id="line-306"> this.taskHostname = taskHostname;</span> |
| <span class="source-line-no">307</span><span id="line-307"> }</span> |
| <span class="source-line-no">308</span><span id="line-308"></span> |
| <span class="source-line-no">309</span><span id="line-309"> public String getCommand() {</span> |
| <span class="source-line-no">310</span><span id="line-310"> return this.command;</span> |
| <span class="source-line-no">311</span><span id="line-311"> }</span> |
| <span class="source-line-no">312</span><span id="line-312"></span> |
| <span class="source-line-no">313</span><span id="line-313"> public String getTaskHostname() {</span> |
| <span class="source-line-no">314</span><span id="line-314"> return taskHostname;</span> |
| <span class="source-line-no">315</span><span id="line-315"> }</span> |
| <span class="source-line-no">316</span><span id="line-316"> }</span> |
| <span class="source-line-no">317</span><span id="line-317"></span> |
| <span class="source-line-no">318</span><span id="line-318">}</span> |
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| </pre> |
| </div> |
| </main> |
| </body> |
| </html> |
