blob: 7dd2ebeb50684821108c94084a9bb75823992d93 [file] [log] [blame]
<!DOCTYPE HTML>
<html lang="en">
<head>
<!-- Generated by javadoc (17) -->
<title>Source code</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="description" content="source: package: org.apache.hadoop.hbase.procedure, class: ZKProcedureMemberRpcs">
<meta name="generator" content="javadoc/SourceToHTMLConverter">
<link rel="stylesheet" type="text/css" href="../../../../../../stylesheet.css" title="Style">
</head>
<body class="source-page">
<main role="main">
<div class="source-container">
<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.procedure;</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.util.Arrays;</span>
<span class="source-line-no">022</span><span id="line-22">import java.util.List;</span>
<span class="source-line-no">023</span><span id="line-23">import org.apache.hadoop.hbase.errorhandling.ForeignException;</span>
<span class="source-line-no">024</span><span id="line-24">import org.apache.hadoop.hbase.util.Bytes;</span>
<span class="source-line-no">025</span><span id="line-25">import org.apache.hadoop.hbase.zookeeper.ZKUtil;</span>
<span class="source-line-no">026</span><span id="line-26">import org.apache.hadoop.hbase.zookeeper.ZKWatcher;</span>
<span class="source-line-no">027</span><span id="line-27">import org.apache.hadoop.hbase.zookeeper.ZNodePaths;</span>
<span class="source-line-no">028</span><span id="line-28">import org.apache.yetus.audience.InterfaceAudience;</span>
<span class="source-line-no">029</span><span id="line-29">import org.apache.zookeeper.KeeperException;</span>
<span class="source-line-no">030</span><span id="line-30">import org.slf4j.Logger;</span>
<span class="source-line-no">031</span><span id="line-31">import org.slf4j.LoggerFactory;</span>
<span class="source-line-no">032</span><span id="line-32"></span>
<span class="source-line-no">033</span><span id="line-33">import org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil;</span>
<span class="source-line-no">034</span><span id="line-34"></span>
<span class="source-line-no">035</span><span id="line-35">/**</span>
<span class="source-line-no">036</span><span id="line-36"> * ZooKeeper based controller for a procedure member.</span>
<span class="source-line-no">037</span><span id="line-37"> * &lt;p&gt;</span>
<span class="source-line-no">038</span><span id="line-38"> * There can only be one {@link ZKProcedureMemberRpcs} per procedure type per member, since each</span>
<span class="source-line-no">039</span><span id="line-39"> * procedure type is bound to a single set of znodes. You can have multiple</span>
<span class="source-line-no">040</span><span id="line-40"> * {@link ZKProcedureMemberRpcs} on the same server, each serving a different member name, but each</span>
<span class="source-line-no">041</span><span id="line-41"> * individual rpcs is still bound to a single member name (and since they are used to determine</span>
<span class="source-line-no">042</span><span id="line-42"> * global progress, its important to not get this wrong).</span>
<span class="source-line-no">043</span><span id="line-43"> * &lt;p&gt;</span>
<span class="source-line-no">044</span><span id="line-44"> * To make this slightly more confusing, you can run multiple, concurrent procedures at the same</span>
<span class="source-line-no">045</span><span id="line-45"> * time (as long as they have different types), from the same controller, but the same node name</span>
<span class="source-line-no">046</span><span id="line-46"> * must be used for each procedure (though there is no conflict between the two procedure as long as</span>
<span class="source-line-no">047</span><span id="line-47"> * they have distinct names).</span>
<span class="source-line-no">048</span><span id="line-48"> * &lt;p&gt;</span>
<span class="source-line-no">049</span><span id="line-49"> * There is no real error recovery with this mechanism currently -- if any the coordinator fails,</span>
<span class="source-line-no">050</span><span id="line-50"> * its re-initialization will delete the znodes and require all in progress subprocedures to start</span>
<span class="source-line-no">051</span><span id="line-51"> * anew.</span>
<span class="source-line-no">052</span><span id="line-52"> */</span>
<span class="source-line-no">053</span><span id="line-53">@InterfaceAudience.Private</span>
<span class="source-line-no">054</span><span id="line-54">public class ZKProcedureMemberRpcs implements ProcedureMemberRpcs {</span>
<span class="source-line-no">055</span><span id="line-55"> private static final Logger LOG = LoggerFactory.getLogger(ZKProcedureMemberRpcs.class);</span>
<span class="source-line-no">056</span><span id="line-56"></span>
<span class="source-line-no">057</span><span id="line-57"> private final ZKProcedureUtil zkController;</span>
<span class="source-line-no">058</span><span id="line-58"></span>
<span class="source-line-no">059</span><span id="line-59"> protected ProcedureMember member;</span>
<span class="source-line-no">060</span><span id="line-60"> private String memberName;</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"> * Must call {@link #start(String, ProcedureMember)} before this can be used.</span>
<span class="source-line-no">064</span><span id="line-64"> * @param watcher {@link ZKWatcher} to be owned by &lt;tt&gt;this&lt;/tt&gt;. Closed via {@link #close()}.</span>
<span class="source-line-no">065</span><span id="line-65"> * @param procType name of the znode describing the procedure type</span>
<span class="source-line-no">066</span><span id="line-66"> * @throws KeeperException if we can't reach zookeeper</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 ZKProcedureMemberRpcs(final ZKWatcher watcher, final String procType)</span>
<span class="source-line-no">069</span><span id="line-69"> throws KeeperException {</span>
<span class="source-line-no">070</span><span id="line-70"> this.zkController = new ZKProcedureUtil(watcher, procType) {</span>
<span class="source-line-no">071</span><span id="line-71"> @Override</span>
<span class="source-line-no">072</span><span id="line-72"> public void nodeCreated(String path) {</span>
<span class="source-line-no">073</span><span id="line-73"> if (!isInProcedurePath(path)) {</span>
<span class="source-line-no">074</span><span id="line-74"> return;</span>
<span class="source-line-no">075</span><span id="line-75"> }</span>
<span class="source-line-no">076</span><span id="line-76"></span>
<span class="source-line-no">077</span><span id="line-77"> LOG.info("Received created event:" + path);</span>
<span class="source-line-no">078</span><span id="line-78"> // if it is a simple start/end/abort then we just rewatch the node</span>
<span class="source-line-no">079</span><span id="line-79"> if (isAcquiredNode(path)) {</span>
<span class="source-line-no">080</span><span id="line-80"> waitForNewProcedures();</span>
<span class="source-line-no">081</span><span id="line-81"> return;</span>
<span class="source-line-no">082</span><span id="line-82"> } else if (isAbortNode(path)) {</span>
<span class="source-line-no">083</span><span id="line-83"> watchForAbortedProcedures();</span>
<span class="source-line-no">084</span><span id="line-84"> return;</span>
<span class="source-line-no">085</span><span id="line-85"> }</span>
<span class="source-line-no">086</span><span id="line-86"> String parent = ZKUtil.getParent(path);</span>
<span class="source-line-no">087</span><span id="line-87"> // if its the end barrier, the procedure can be completed</span>
<span class="source-line-no">088</span><span id="line-88"> if (isReachedNode(parent)) {</span>
<span class="source-line-no">089</span><span id="line-89"> receivedReachedGlobalBarrier(path);</span>
<span class="source-line-no">090</span><span id="line-90"> return;</span>
<span class="source-line-no">091</span><span id="line-91"> } else if (isAbortNode(parent)) {</span>
<span class="source-line-no">092</span><span id="line-92"> abort(path);</span>
<span class="source-line-no">093</span><span id="line-93"> return;</span>
<span class="source-line-no">094</span><span id="line-94"> } else if (isAcquiredNode(parent)) {</span>
<span class="source-line-no">095</span><span id="line-95"> startNewSubprocedure(path);</span>
<span class="source-line-no">096</span><span id="line-96"> } else {</span>
<span class="source-line-no">097</span><span id="line-97"> LOG.debug("Ignoring created notification for node:" + path);</span>
<span class="source-line-no">098</span><span id="line-98"> }</span>
<span class="source-line-no">099</span><span id="line-99"> }</span>
<span class="source-line-no">100</span><span id="line-100"></span>
<span class="source-line-no">101</span><span id="line-101"> @Override</span>
<span class="source-line-no">102</span><span id="line-102"> public void nodeChildrenChanged(String path) {</span>
<span class="source-line-no">103</span><span id="line-103"> if (path.equals(this.acquiredZnode)) {</span>
<span class="source-line-no">104</span><span id="line-104"> LOG.info("Received procedure start children changed event: " + path);</span>
<span class="source-line-no">105</span><span id="line-105"> waitForNewProcedures();</span>
<span class="source-line-no">106</span><span id="line-106"> } else if (path.equals(this.abortZnode)) {</span>
<span class="source-line-no">107</span><span id="line-107"> LOG.info("Received procedure abort children changed event: " + path);</span>
<span class="source-line-no">108</span><span id="line-108"> watchForAbortedProcedures();</span>
<span class="source-line-no">109</span><span id="line-109"> }</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"> public ZKProcedureUtil getZkController() {</span>
<span class="source-line-no">115</span><span id="line-115"> return zkController;</span>
<span class="source-line-no">116</span><span id="line-116"> }</span>
<span class="source-line-no">117</span><span id="line-117"></span>
<span class="source-line-no">118</span><span id="line-118"> @Override</span>
<span class="source-line-no">119</span><span id="line-119"> public String getMemberName() {</span>
<span class="source-line-no">120</span><span id="line-120"> return memberName;</span>
<span class="source-line-no">121</span><span id="line-121"> }</span>
<span class="source-line-no">122</span><span id="line-122"></span>
<span class="source-line-no">123</span><span id="line-123"> /**</span>
<span class="source-line-no">124</span><span id="line-124"> * Pass along the procedure global barrier notification to any listeners</span>
<span class="source-line-no">125</span><span id="line-125"> * @param path full znode path that cause the notification</span>
<span class="source-line-no">126</span><span id="line-126"> */</span>
<span class="source-line-no">127</span><span id="line-127"> private void receivedReachedGlobalBarrier(String path) {</span>
<span class="source-line-no">128</span><span id="line-128"> LOG.debug("Received reached global barrier:" + path);</span>
<span class="source-line-no">129</span><span id="line-129"> String procName = ZKUtil.getNodeName(path);</span>
<span class="source-line-no">130</span><span id="line-130"> this.member.receivedReachedGlobalBarrier(procName);</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"> private void watchForAbortedProcedures() {</span>
<span class="source-line-no">134</span><span id="line-134"> LOG.debug("Checking for aborted procedures on node: '" + zkController.getAbortZnode() + "'");</span>
<span class="source-line-no">135</span><span id="line-135"> try {</span>
<span class="source-line-no">136</span><span id="line-136"> // this is the list of the currently aborted procedues</span>
<span class="source-line-no">137</span><span id="line-137"> List&lt;String&gt; children = ZKUtil.listChildrenAndWatchForNewChildren(zkController.getWatcher(),</span>
<span class="source-line-no">138</span><span id="line-138"> zkController.getAbortZnode());</span>
<span class="source-line-no">139</span><span id="line-139"> if (children == null || children.isEmpty()) {</span>
<span class="source-line-no">140</span><span id="line-140"> return;</span>
<span class="source-line-no">141</span><span id="line-141"> }</span>
<span class="source-line-no">142</span><span id="line-142"> for (String node : children) {</span>
<span class="source-line-no">143</span><span id="line-143"> String abortNode = ZNodePaths.joinZNode(zkController.getAbortZnode(), node);</span>
<span class="source-line-no">144</span><span id="line-144"> abort(abortNode);</span>
<span class="source-line-no">145</span><span id="line-145"> }</span>
<span class="source-line-no">146</span><span id="line-146"> } catch (KeeperException e) {</span>
<span class="source-line-no">147</span><span id="line-147"> member.controllerConnectionFailure(</span>
<span class="source-line-no">148</span><span id="line-148"> "Failed to list children for abort node:" + zkController.getAbortZnode(), e, null);</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"> private void waitForNewProcedures() {</span>
<span class="source-line-no">153</span><span id="line-153"> // watch for new procedues that we need to start subprocedures for</span>
<span class="source-line-no">154</span><span id="line-154"> LOG.debug("Looking for new procedures under znode:'" + zkController.getAcquiredBarrier() + "'");</span>
<span class="source-line-no">155</span><span id="line-155"> List&lt;String&gt; runningProcedures = null;</span>
<span class="source-line-no">156</span><span id="line-156"> try {</span>
<span class="source-line-no">157</span><span id="line-157"> runningProcedures = ZKUtil.listChildrenAndWatchForNewChildren(zkController.getWatcher(),</span>
<span class="source-line-no">158</span><span id="line-158"> zkController.getAcquiredBarrier());</span>
<span class="source-line-no">159</span><span id="line-159"> if (runningProcedures == null) {</span>
<span class="source-line-no">160</span><span id="line-160"> LOG.debug("No running procedures.");</span>
<span class="source-line-no">161</span><span id="line-161"> return;</span>
<span class="source-line-no">162</span><span id="line-162"> }</span>
<span class="source-line-no">163</span><span id="line-163"> } catch (KeeperException e) {</span>
<span class="source-line-no">164</span><span id="line-164"> member.controllerConnectionFailure("General failure when watching for new procedures", e,</span>
<span class="source-line-no">165</span><span id="line-165"> null);</span>
<span class="source-line-no">166</span><span id="line-166"> }</span>
<span class="source-line-no">167</span><span id="line-167"> if (runningProcedures == null) {</span>
<span class="source-line-no">168</span><span id="line-168"> LOG.debug("No running procedures.");</span>
<span class="source-line-no">169</span><span id="line-169"> return;</span>
<span class="source-line-no">170</span><span id="line-170"> }</span>
<span class="source-line-no">171</span><span id="line-171"> for (String procName : runningProcedures) {</span>
<span class="source-line-no">172</span><span id="line-172"> // then read in the procedure information</span>
<span class="source-line-no">173</span><span id="line-173"> String path = ZNodePaths.joinZNode(zkController.getAcquiredBarrier(), procName);</span>
<span class="source-line-no">174</span><span id="line-174"> startNewSubprocedure(path);</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"> * Kick off a new sub-procedure on the listener with the data stored in the passed znode.</span>
<span class="source-line-no">180</span><span id="line-180"> * &lt;p&gt;</span>
<span class="source-line-no">181</span><span id="line-181"> * Will attempt to create the same procedure multiple times if an procedure znode with the same</span>
<span class="source-line-no">182</span><span id="line-182"> * name is created. It is left up the coordinator to ensure this doesn't occur.</span>
<span class="source-line-no">183</span><span id="line-183"> * @param path full path to the znode for the procedure to start</span>
<span class="source-line-no">184</span><span id="line-184"> */</span>
<span class="source-line-no">185</span><span id="line-185"> private synchronized void startNewSubprocedure(String path) {</span>
<span class="source-line-no">186</span><span id="line-186"> LOG.debug("Found procedure znode: " + path);</span>
<span class="source-line-no">187</span><span id="line-187"> String opName = ZKUtil.getNodeName(path);</span>
<span class="source-line-no">188</span><span id="line-188"> // start watching for an abort notification for the procedure</span>
<span class="source-line-no">189</span><span id="line-189"> String abortZNode = zkController.getAbortZNode(opName);</span>
<span class="source-line-no">190</span><span id="line-190"> try {</span>
<span class="source-line-no">191</span><span id="line-191"> if (ZKUtil.watchAndCheckExists(zkController.getWatcher(), abortZNode)) {</span>
<span class="source-line-no">192</span><span id="line-192"> LOG.debug("Not starting:" + opName + " because we already have an abort notification.");</span>
<span class="source-line-no">193</span><span id="line-193"> return;</span>
<span class="source-line-no">194</span><span id="line-194"> }</span>
<span class="source-line-no">195</span><span id="line-195"> } catch (KeeperException e) {</span>
<span class="source-line-no">196</span><span id="line-196"> member.controllerConnectionFailure(</span>
<span class="source-line-no">197</span><span id="line-197"> "Failed to get the abort znode (" + abortZNode + ") for procedure :" + opName, e, opName);</span>
<span class="source-line-no">198</span><span id="line-198"> return;</span>
<span class="source-line-no">199</span><span id="line-199"> }</span>
<span class="source-line-no">200</span><span id="line-200"></span>
<span class="source-line-no">201</span><span id="line-201"> // get the data for the procedure</span>
<span class="source-line-no">202</span><span id="line-202"> Subprocedure subproc = null;</span>
<span class="source-line-no">203</span><span id="line-203"> try {</span>
<span class="source-line-no">204</span><span id="line-204"> byte[] data = ZKUtil.getData(zkController.getWatcher(), path);</span>
<span class="source-line-no">205</span><span id="line-205"> if (!ProtobufUtil.isPBMagicPrefix(data)) {</span>
<span class="source-line-no">206</span><span id="line-206"> String msg =</span>
<span class="source-line-no">207</span><span id="line-207"> "Data in for starting procedure " + opName + " is illegally formatted (no pb magic). "</span>
<span class="source-line-no">208</span><span id="line-208"> + "Killing the procedure: " + Bytes.toString(data);</span>
<span class="source-line-no">209</span><span id="line-209"> LOG.error(msg);</span>
<span class="source-line-no">210</span><span id="line-210"> throw new IllegalArgumentException(msg);</span>
<span class="source-line-no">211</span><span id="line-211"> }</span>
<span class="source-line-no">212</span><span id="line-212"> LOG.debug("start proc data length is " + data.length);</span>
<span class="source-line-no">213</span><span id="line-213"> data = Arrays.copyOfRange(data, ProtobufUtil.lengthOfPBMagic(), data.length);</span>
<span class="source-line-no">214</span><span id="line-214"> LOG.debug("Found data for znode:" + path);</span>
<span class="source-line-no">215</span><span id="line-215"> subproc = member.createSubprocedure(opName, data);</span>
<span class="source-line-no">216</span><span id="line-216"> member.submitSubprocedure(subproc);</span>
<span class="source-line-no">217</span><span id="line-217"> } catch (IllegalArgumentException iae) {</span>
<span class="source-line-no">218</span><span id="line-218"> LOG.error("Illegal argument exception", iae);</span>
<span class="source-line-no">219</span><span id="line-219"> sendMemberAborted(subproc, new ForeignException(getMemberName(), iae));</span>
<span class="source-line-no">220</span><span id="line-220"> } catch (IllegalStateException ise) {</span>
<span class="source-line-no">221</span><span id="line-221"> LOG.error("Illegal state exception ", ise);</span>
<span class="source-line-no">222</span><span id="line-222"> sendMemberAborted(subproc, new ForeignException(getMemberName(), ise));</span>
<span class="source-line-no">223</span><span id="line-223"> } catch (KeeperException e) {</span>
<span class="source-line-no">224</span><span id="line-224"> member.controllerConnectionFailure("Failed to get data for new procedure:" + opName, e,</span>
<span class="source-line-no">225</span><span id="line-225"> opName);</span>
<span class="source-line-no">226</span><span id="line-226"> } catch (InterruptedException e) {</span>
<span class="source-line-no">227</span><span id="line-227"> member.controllerConnectionFailure("Failed to get data for new procedure:" + opName, e,</span>
<span class="source-line-no">228</span><span id="line-228"> opName);</span>
<span class="source-line-no">229</span><span id="line-229"> Thread.currentThread().interrupt();</span>
<span class="source-line-no">230</span><span id="line-230"> }</span>
<span class="source-line-no">231</span><span id="line-231"> }</span>
<span class="source-line-no">232</span><span id="line-232"></span>
<span class="source-line-no">233</span><span id="line-233"> /**</span>
<span class="source-line-no">234</span><span id="line-234"> * This attempts to create an acquired state znode for the procedure (snapshot name). It then</span>
<span class="source-line-no">235</span><span id="line-235"> * looks for the reached znode to trigger in-barrier execution. If not present we have a watcher,</span>
<span class="source-line-no">236</span><span id="line-236"> * if present then trigger the in-barrier action.</span>
<span class="source-line-no">237</span><span id="line-237"> */</span>
<span class="source-line-no">238</span><span id="line-238"> @Override</span>
<span class="source-line-no">239</span><span id="line-239"> public void sendMemberAcquired(Subprocedure sub) throws IOException {</span>
<span class="source-line-no">240</span><span id="line-240"> String procName = sub.getName();</span>
<span class="source-line-no">241</span><span id="line-241"> try {</span>
<span class="source-line-no">242</span><span id="line-242"> LOG.debug("Member: '" + memberName + "' joining acquired barrier for procedure (" + procName</span>
<span class="source-line-no">243</span><span id="line-243"> + ") in zk");</span>
<span class="source-line-no">244</span><span id="line-244"> String acquiredZNode = ZNodePaths</span>
<span class="source-line-no">245</span><span id="line-245"> .joinZNode(ZKProcedureUtil.getAcquireBarrierNode(zkController, procName), memberName);</span>
<span class="source-line-no">246</span><span id="line-246"> ZKUtil.createAndFailSilent(zkController.getWatcher(), acquiredZNode);</span>
<span class="source-line-no">247</span><span id="line-247"></span>
<span class="source-line-no">248</span><span id="line-248"> // watch for the complete node for this snapshot</span>
<span class="source-line-no">249</span><span id="line-249"> String reachedBarrier = zkController.getReachedBarrierNode(procName);</span>
<span class="source-line-no">250</span><span id="line-250"> LOG.debug("Watch for global barrier reached:" + reachedBarrier);</span>
<span class="source-line-no">251</span><span id="line-251"> if (ZKUtil.watchAndCheckExists(zkController.getWatcher(), reachedBarrier)) {</span>
<span class="source-line-no">252</span><span id="line-252"> receivedReachedGlobalBarrier(reachedBarrier);</span>
<span class="source-line-no">253</span><span id="line-253"> }</span>
<span class="source-line-no">254</span><span id="line-254"> } catch (KeeperException e) {</span>
<span class="source-line-no">255</span><span id="line-255"> member.controllerConnectionFailure(</span>
<span class="source-line-no">256</span><span id="line-256"> "Failed to acquire barrier for procedure: " + procName + " and member: " + memberName, e,</span>
<span class="source-line-no">257</span><span id="line-257"> procName);</span>
<span class="source-line-no">258</span><span id="line-258"> }</span>
<span class="source-line-no">259</span><span id="line-259"> }</span>
<span class="source-line-no">260</span><span id="line-260"></span>
<span class="source-line-no">261</span><span id="line-261"> /**</span>
<span class="source-line-no">262</span><span id="line-262"> * This acts as the ack for a completed procedure</span>
<span class="source-line-no">263</span><span id="line-263"> */</span>
<span class="source-line-no">264</span><span id="line-264"> @Override</span>
<span class="source-line-no">265</span><span id="line-265"> public void sendMemberCompleted(Subprocedure sub, byte[] data) throws IOException {</span>
<span class="source-line-no">266</span><span id="line-266"> String procName = sub.getName();</span>
<span class="source-line-no">267</span><span id="line-267"> LOG.debug(</span>
<span class="source-line-no">268</span><span id="line-268"> "Marking procedure '" + procName + "' completed for member '" + memberName + "' in zk");</span>
<span class="source-line-no">269</span><span id="line-269"> String joinPath =</span>
<span class="source-line-no">270</span><span id="line-270"> ZNodePaths.joinZNode(zkController.getReachedBarrierNode(procName), memberName);</span>
<span class="source-line-no">271</span><span id="line-271"> // ProtobufUtil.prependPBMagic does not take care of null</span>
<span class="source-line-no">272</span><span id="line-272"> if (data == null) {</span>
<span class="source-line-no">273</span><span id="line-273"> data = new byte[0];</span>
<span class="source-line-no">274</span><span id="line-274"> }</span>
<span class="source-line-no">275</span><span id="line-275"> try {</span>
<span class="source-line-no">276</span><span id="line-276"> ZKUtil.createAndFailSilent(zkController.getWatcher(), joinPath,</span>
<span class="source-line-no">277</span><span id="line-277"> ProtobufUtil.prependPBMagic(data));</span>
<span class="source-line-no">278</span><span id="line-278"> } catch (KeeperException e) {</span>
<span class="source-line-no">279</span><span id="line-279"> member.controllerConnectionFailure(</span>
<span class="source-line-no">280</span><span id="line-280"> "Failed to post zk node:" + joinPath + " to join procedure barrier.", e, procName);</span>
<span class="source-line-no">281</span><span id="line-281"> }</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"> * This should be called by the member and should write a serialized root cause exception as to</span>
<span class="source-line-no">286</span><span id="line-286"> * the abort znode.</span>
<span class="source-line-no">287</span><span id="line-287"> */</span>
<span class="source-line-no">288</span><span id="line-288"> @Override</span>
<span class="source-line-no">289</span><span id="line-289"> public void sendMemberAborted(Subprocedure sub, ForeignException ee) {</span>
<span class="source-line-no">290</span><span id="line-290"> if (sub == null) {</span>
<span class="source-line-no">291</span><span id="line-291"> LOG.error("Failed due to null subprocedure", ee);</span>
<span class="source-line-no">292</span><span id="line-292"> return;</span>
<span class="source-line-no">293</span><span id="line-293"> }</span>
<span class="source-line-no">294</span><span id="line-294"> String procName = sub.getName();</span>
<span class="source-line-no">295</span><span id="line-295"> LOG.debug("Aborting procedure (" + procName + ") in zk");</span>
<span class="source-line-no">296</span><span id="line-296"> String procAbortZNode = zkController.getAbortZNode(procName);</span>
<span class="source-line-no">297</span><span id="line-297"> try {</span>
<span class="source-line-no">298</span><span id="line-298"> String source = (ee.getSource() == null) ? memberName : ee.getSource();</span>
<span class="source-line-no">299</span><span id="line-299"> byte[] errorInfo = ProtobufUtil.prependPBMagic(ForeignException.serialize(source, ee));</span>
<span class="source-line-no">300</span><span id="line-300"> ZKUtil.createAndFailSilent(zkController.getWatcher(), procAbortZNode, errorInfo);</span>
<span class="source-line-no">301</span><span id="line-301"> LOG.debug("Finished creating abort znode:" + procAbortZNode);</span>
<span class="source-line-no">302</span><span id="line-302"> } catch (KeeperException e) {</span>
<span class="source-line-no">303</span><span id="line-303"> // possible that we get this error for the procedure if we already reset the zk state, but in</span>
<span class="source-line-no">304</span><span id="line-304"> // that case we should still get an error for that procedure anyways</span>
<span class="source-line-no">305</span><span id="line-305"> zkController.logZKTree(zkController.getBaseZnode());</span>
<span class="source-line-no">306</span><span id="line-306"> member.controllerConnectionFailure(</span>
<span class="source-line-no">307</span><span id="line-307"> "Failed to post zk node:" + procAbortZNode + " to abort procedure", e, procName);</span>
<span class="source-line-no">308</span><span id="line-308"> }</span>
<span class="source-line-no">309</span><span id="line-309"> }</span>
<span class="source-line-no">310</span><span id="line-310"></span>
<span class="source-line-no">311</span><span id="line-311"> /**</span>
<span class="source-line-no">312</span><span id="line-312"> * Pass along the found abort notification to the listener</span>
<span class="source-line-no">313</span><span id="line-313"> * @param abortZNode full znode path to the failed procedure information</span>
<span class="source-line-no">314</span><span id="line-314"> */</span>
<span class="source-line-no">315</span><span id="line-315"> protected void abort(String abortZNode) {</span>
<span class="source-line-no">316</span><span id="line-316"> LOG.debug("Aborting procedure member for znode " + abortZNode);</span>
<span class="source-line-no">317</span><span id="line-317"> String opName = ZKUtil.getNodeName(abortZNode);</span>
<span class="source-line-no">318</span><span id="line-318"> try {</span>
<span class="source-line-no">319</span><span id="line-319"> byte[] data = ZKUtil.getData(zkController.getWatcher(), abortZNode);</span>
<span class="source-line-no">320</span><span id="line-320"></span>
<span class="source-line-no">321</span><span id="line-321"> // figure out the data we need to pass</span>
<span class="source-line-no">322</span><span id="line-322"> ForeignException ee;</span>
<span class="source-line-no">323</span><span id="line-323"> try {</span>
<span class="source-line-no">324</span><span id="line-324"> if (data == null || data.length == 0) {</span>
<span class="source-line-no">325</span><span id="line-325"> // ignore</span>
<span class="source-line-no">326</span><span id="line-326"> return;</span>
<span class="source-line-no">327</span><span id="line-327"> } else if (!ProtobufUtil.isPBMagicPrefix(data)) {</span>
<span class="source-line-no">328</span><span id="line-328"> String msg = "Illegally formatted data in abort node for proc " + opName</span>
<span class="source-line-no">329</span><span id="line-329"> + ". Killing the procedure.";</span>
<span class="source-line-no">330</span><span id="line-330"> LOG.error(msg);</span>
<span class="source-line-no">331</span><span id="line-331"> // we got a remote exception, but we can't describe it so just return exn from here</span>
<span class="source-line-no">332</span><span id="line-332"> ee = new ForeignException(getMemberName(), new IllegalArgumentException(msg));</span>
<span class="source-line-no">333</span><span id="line-333"> } else {</span>
<span class="source-line-no">334</span><span id="line-334"> data = Arrays.copyOfRange(data, ProtobufUtil.lengthOfPBMagic(), data.length);</span>
<span class="source-line-no">335</span><span id="line-335"> ee = ForeignException.deserialize(data);</span>
<span class="source-line-no">336</span><span id="line-336"> }</span>
<span class="source-line-no">337</span><span id="line-337"> } catch (IOException e) {</span>
<span class="source-line-no">338</span><span id="line-338"> LOG.warn("Got an error notification for op:" + opName</span>
<span class="source-line-no">339</span><span id="line-339"> + " but we can't read the information. Killing the procedure.");</span>
<span class="source-line-no">340</span><span id="line-340"> // we got a remote exception, but we can't describe it so just return exn from here</span>
<span class="source-line-no">341</span><span id="line-341"> ee = new ForeignException(getMemberName(), e);</span>
<span class="source-line-no">342</span><span id="line-342"> }</span>
<span class="source-line-no">343</span><span id="line-343"></span>
<span class="source-line-no">344</span><span id="line-344"> this.member.receiveAbortProcedure(opName, ee);</span>
<span class="source-line-no">345</span><span id="line-345"> } catch (KeeperException e) {</span>
<span class="source-line-no">346</span><span id="line-346"> member.controllerConnectionFailure(</span>
<span class="source-line-no">347</span><span id="line-347"> "Failed to get data for abort znode:" + abortZNode + zkController.getAbortZnode(), e,</span>
<span class="source-line-no">348</span><span id="line-348"> opName);</span>
<span class="source-line-no">349</span><span id="line-349"> } catch (InterruptedException e) {</span>
<span class="source-line-no">350</span><span id="line-350"> LOG.warn("abort already in progress", e);</span>
<span class="source-line-no">351</span><span id="line-351"> Thread.currentThread().interrupt();</span>
<span class="source-line-no">352</span><span id="line-352"> }</span>
<span class="source-line-no">353</span><span id="line-353"> }</span>
<span class="source-line-no">354</span><span id="line-354"></span>
<span class="source-line-no">355</span><span id="line-355"> @Override</span>
<span class="source-line-no">356</span><span id="line-356"> public void start(final String memberName, final ProcedureMember listener) {</span>
<span class="source-line-no">357</span><span id="line-357"> LOG.debug("Starting procedure member '" + memberName + "'");</span>
<span class="source-line-no">358</span><span id="line-358"> this.member = listener;</span>
<span class="source-line-no">359</span><span id="line-359"> this.memberName = memberName;</span>
<span class="source-line-no">360</span><span id="line-360"> watchForAbortedProcedures();</span>
<span class="source-line-no">361</span><span id="line-361"> waitForNewProcedures();</span>
<span class="source-line-no">362</span><span id="line-362"> }</span>
<span class="source-line-no">363</span><span id="line-363"></span>
<span class="source-line-no">364</span><span id="line-364"> @Override</span>
<span class="source-line-no">365</span><span id="line-365"> public void close() throws IOException {</span>
<span class="source-line-no">366</span><span id="line-366"> zkController.close();</span>
<span class="source-line-no">367</span><span id="line-367"> }</span>
<span class="source-line-no">368</span><span id="line-368"></span>
<span class="source-line-no">369</span><span id="line-369">}</span>
</pre>
</div>
</main>
</body>
</html>