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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 io.opentelemetry.api.trace.Span;</span> |
| <span class="source-line-no">021</span><span id="line-21">import io.opentelemetry.api.trace.StatusCode;</span> |
| <span class="source-line-no">022</span><span id="line-22">import io.opentelemetry.context.Scope;</span> |
| <span class="source-line-no">023</span><span id="line-23">import java.io.IOException;</span> |
| <span class="source-line-no">024</span><span id="line-24">import java.lang.management.ManagementFactory;</span> |
| <span class="source-line-no">025</span><span id="line-25">import java.util.ArrayList;</span> |
| <span class="source-line-no">026</span><span id="line-26">import java.util.LinkedList;</span> |
| <span class="source-line-no">027</span><span id="line-27">import java.util.List;</span> |
| <span class="source-line-no">028</span><span id="line-28">import org.apache.hadoop.conf.Configuration;</span> |
| <span class="source-line-no">029</span><span id="line-29">import org.apache.hadoop.hbase.HConstants;</span> |
| <span class="source-line-no">030</span><span id="line-30">import org.apache.hadoop.hbase.trace.TraceUtil;</span> |
| <span class="source-line-no">031</span><span id="line-31">import org.apache.hadoop.hbase.util.Bytes;</span> |
| <span class="source-line-no">032</span><span id="line-32">import org.apache.hadoop.hbase.util.RetryCounter;</span> |
| <span class="source-line-no">033</span><span id="line-33">import org.apache.hadoop.hbase.util.RetryCounterFactory;</span> |
| <span class="source-line-no">034</span><span id="line-34">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">035</span><span id="line-35">import org.apache.zookeeper.AsyncCallback;</span> |
| <span class="source-line-no">036</span><span id="line-36">import org.apache.zookeeper.CreateMode;</span> |
| <span class="source-line-no">037</span><span id="line-37">import org.apache.zookeeper.KeeperException;</span> |
| <span class="source-line-no">038</span><span id="line-38">import org.apache.zookeeper.Op;</span> |
| <span class="source-line-no">039</span><span id="line-39">import org.apache.zookeeper.OpResult;</span> |
| <span class="source-line-no">040</span><span id="line-40">import org.apache.zookeeper.Watcher;</span> |
| <span class="source-line-no">041</span><span id="line-41">import org.apache.zookeeper.ZooDefs;</span> |
| <span class="source-line-no">042</span><span id="line-42">import org.apache.zookeeper.ZooKeeper;</span> |
| <span class="source-line-no">043</span><span id="line-43">import org.apache.zookeeper.ZooKeeper.States;</span> |
| <span class="source-line-no">044</span><span id="line-44">import org.apache.zookeeper.client.ZKClientConfig;</span> |
| <span class="source-line-no">045</span><span id="line-45">import org.apache.zookeeper.data.ACL;</span> |
| <span class="source-line-no">046</span><span id="line-46">import org.apache.zookeeper.data.Stat;</span> |
| <span class="source-line-no">047</span><span id="line-47">import org.apache.zookeeper.proto.CreateRequest;</span> |
| <span class="source-line-no">048</span><span id="line-48">import org.apache.zookeeper.proto.SetDataRequest;</span> |
| <span class="source-line-no">049</span><span id="line-49">import org.slf4j.Logger;</span> |
| <span class="source-line-no">050</span><span id="line-50">import org.slf4j.LoggerFactory;</span> |
| <span class="source-line-no">051</span><span id="line-51"></span> |
| <span class="source-line-no">052</span><span id="line-52">/**</span> |
| <span class="source-line-no">053</span><span id="line-53"> * A zookeeper that can handle 'recoverable' errors.</span> |
| <span class="source-line-no">054</span><span id="line-54"> * <p></span> |
| <span class="source-line-no">055</span><span id="line-55"> * To handle recoverable errors, developers need to realize that there are two classes of requests:</span> |
| <span class="source-line-no">056</span><span id="line-56"> * idempotent and non-idempotent requests. Read requests and unconditional sets and deletes are</span> |
| <span class="source-line-no">057</span><span id="line-57"> * examples of idempotent requests, they can be reissued with the same results.</span> |
| <span class="source-line-no">058</span><span id="line-58"> * <p></span> |
| <span class="source-line-no">059</span><span id="line-59"> * (Although, the delete may throw a NoNodeException on reissue its effect on the ZooKeeper state is</span> |
| <span class="source-line-no">060</span><span id="line-60"> * the same.) Non-idempotent requests need special handling, application and library writers need to</span> |
| <span class="source-line-no">061</span><span id="line-61"> * keep in mind that they may need to encode information in the data or name of znodes to detect</span> |
| <span class="source-line-no">062</span><span id="line-62"> * retries. A simple example is a create that uses a sequence flag. If a process issues a</span> |
| <span class="source-line-no">063</span><span id="line-63"> * create("/x-", ..., SEQUENCE) and gets a connection loss exception, that process will reissue</span> |
| <span class="source-line-no">064</span><span id="line-64"> * another create("/x-", ..., SEQUENCE) and get back x-111. When the process does a</span> |
| <span class="source-line-no">065</span><span id="line-65"> * getChildren("/"), it sees x-1,x-30,x-109,x-110,x-111, now it could be that x-109 was the result</span> |
| <span class="source-line-no">066</span><span id="line-66"> * of the previous create, so the process actually owns both x-109 and x-111. An easy way around</span> |
| <span class="source-line-no">067</span><span id="line-67"> * this is to use "x-process id-" when doing the create. If the process is using an id of 352,</span> |
| <span class="source-line-no">068</span><span id="line-68"> * before reissuing the create it will do a getChildren("/") and see "x-222-1", "x-542-30",</span> |
| <span class="source-line-no">069</span><span id="line-69"> * "x-352-109", x-333-110". The process will know that the original create succeeded an the znode it</span> |
| <span class="source-line-no">070</span><span id="line-70"> * created is "x-352-109".</span> |
| <span class="source-line-no">071</span><span id="line-71"> * @see "https://cwiki.apache.org/confluence/display/HADOOP2/ZooKeeper+ErrorHandling"</span> |
| <span class="source-line-no">072</span><span id="line-72"> */</span> |
| <span class="source-line-no">073</span><span id="line-73">@InterfaceAudience.Private</span> |
| <span class="source-line-no">074</span><span id="line-74">public class RecoverableZooKeeper {</span> |
| <span class="source-line-no">075</span><span id="line-75"> private static final Logger LOG = LoggerFactory.getLogger(RecoverableZooKeeper.class);</span> |
| <span class="source-line-no">076</span><span id="line-76"> // the actual ZooKeeper client instance</span> |
| <span class="source-line-no">077</span><span id="line-77"> private ZooKeeper zk;</span> |
| <span class="source-line-no">078</span><span id="line-78"> private final RetryCounterFactory retryCounterFactory;</span> |
| <span class="source-line-no">079</span><span id="line-79"> // An identifier of this process in the cluster</span> |
| <span class="source-line-no">080</span><span id="line-80"> private final String identifier;</span> |
| <span class="source-line-no">081</span><span id="line-81"> private final byte[] id;</span> |
| <span class="source-line-no">082</span><span id="line-82"> private final Watcher watcher;</span> |
| <span class="source-line-no">083</span><span id="line-83"> private final int sessionTimeout;</span> |
| <span class="source-line-no">084</span><span id="line-84"> private final String quorumServers;</span> |
| <span class="source-line-no">085</span><span id="line-85"> private final int maxMultiSize;</span> |
| <span class="source-line-no">086</span><span id="line-86"> private final ZKClientConfig zkClientConfig;</span> |
| <span class="source-line-no">087</span><span id="line-87"></span> |
| <span class="source-line-no">088</span><span id="line-88"> /**</span> |
| <span class="source-line-no">089</span><span id="line-89"> * See {@link #connect(Configuration, String, Watcher, String, ZKClientConfig)}.</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 static RecoverableZooKeeper connect(Configuration conf, Watcher watcher)</span> |
| <span class="source-line-no">092</span><span id="line-92"> throws IOException {</span> |
| <span class="source-line-no">093</span><span id="line-93"> String ensemble = ZKConfig.getZKQuorumServersString(conf);</span> |
| <span class="source-line-no">094</span><span id="line-94"> return connect(conf, ensemble, watcher, null, null);</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"> /**</span> |
| <span class="source-line-no">098</span><span id="line-98"> * Creates a new connection to ZooKeeper, pulling settings and ensemble config from the specified</span> |
| <span class="source-line-no">099</span><span id="line-99"> * configuration object using methods from {@link ZKConfig}. Sets the connection status monitoring</span> |
| <span class="source-line-no">100</span><span id="line-100"> * watcher to the specified watcher.</span> |
| <span class="source-line-no">101</span><span id="line-101"> * @param conf configuration to pull ensemble and other settings from</span> |
| <span class="source-line-no">102</span><span id="line-102"> * @param watcher watcher to monitor connection changes</span> |
| <span class="source-line-no">103</span><span id="line-103"> * @param ensemble ZooKeeper servers quorum string</span> |
| <span class="source-line-no">104</span><span id="line-104"> * @param identifier value used to identify this client instance.</span> |
| <span class="source-line-no">105</span><span id="line-105"> * @param zkClientConfig client specific configurations for this instance</span> |
| <span class="source-line-no">106</span><span id="line-106"> * @return connection to zookeeper</span> |
| <span class="source-line-no">107</span><span id="line-107"> * @throws IOException if unable to connect to zk or config problem</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 static RecoverableZooKeeper connect(Configuration conf, String ensemble, Watcher watcher,</span> |
| <span class="source-line-no">110</span><span id="line-110"> final String identifier, ZKClientConfig zkClientConfig) throws IOException {</span> |
| <span class="source-line-no">111</span><span id="line-111"> if (ensemble == null) {</span> |
| <span class="source-line-no">112</span><span id="line-112"> throw new IOException("Unable to determine ZooKeeper ensemble");</span> |
| <span class="source-line-no">113</span><span id="line-113"> }</span> |
| <span class="source-line-no">114</span><span id="line-114"> int timeout = conf.getInt(HConstants.ZK_SESSION_TIMEOUT, HConstants.DEFAULT_ZK_SESSION_TIMEOUT);</span> |
| <span class="source-line-no">115</span><span id="line-115"> if (LOG.isTraceEnabled()) {</span> |
| <span class="source-line-no">116</span><span id="line-116"> LOG.trace("{} opening connection to ZooKeeper ensemble={}", identifier, ensemble);</span> |
| <span class="source-line-no">117</span><span id="line-117"> }</span> |
| <span class="source-line-no">118</span><span id="line-118"> int retry = conf.getInt("zookeeper.recovery.retry", 3);</span> |
| <span class="source-line-no">119</span><span id="line-119"> int retryIntervalMillis = conf.getInt("zookeeper.recovery.retry.intervalmill", 1000);</span> |
| <span class="source-line-no">120</span><span id="line-120"> int maxSleepTime = conf.getInt("zookeeper.recovery.retry.maxsleeptime", 60000);</span> |
| <span class="source-line-no">121</span><span id="line-121"> int multiMaxSize = conf.getInt("zookeeper.multi.max.size", 1024 * 1024);</span> |
| <span class="source-line-no">122</span><span id="line-122"> return new RecoverableZooKeeper(ensemble, timeout, watcher, retry, retryIntervalMillis,</span> |
| <span class="source-line-no">123</span><span id="line-123"> maxSleepTime, identifier, multiMaxSize, zkClientConfig);</span> |
| <span class="source-line-no">124</span><span id="line-124"> }</span> |
| <span class="source-line-no">125</span><span id="line-125"></span> |
| <span class="source-line-no">126</span><span id="line-126"> RecoverableZooKeeper(String quorumServers, int sessionTimeout, Watcher watcher, int maxRetries,</span> |
| <span class="source-line-no">127</span><span id="line-127"> int retryIntervalMillis, int maxSleepTime, String identifier, int maxMultiSize,</span> |
| <span class="source-line-no">128</span><span id="line-128"> ZKClientConfig zkClientConfig) throws IOException {</span> |
| <span class="source-line-no">129</span><span id="line-129"> // TODO: Add support for zk 'chroot'; we don't add it to the quorumServers String as we should.</span> |
| <span class="source-line-no">130</span><span id="line-130"> this.retryCounterFactory =</span> |
| <span class="source-line-no">131</span><span id="line-131"> new RetryCounterFactory(maxRetries + 1, retryIntervalMillis, maxSleepTime);</span> |
| <span class="source-line-no">132</span><span id="line-132"></span> |
| <span class="source-line-no">133</span><span id="line-133"> if (identifier == null || identifier.length() == 0) {</span> |
| <span class="source-line-no">134</span><span id="line-134"> // the identifier = processID@hostName</span> |
| <span class="source-line-no">135</span><span id="line-135"> identifier = ManagementFactory.getRuntimeMXBean().getName();</span> |
| <span class="source-line-no">136</span><span id="line-136"> }</span> |
| <span class="source-line-no">137</span><span id="line-137"> LOG.info("Process identifier={} connecting to ZooKeeper ensemble={}", identifier,</span> |
| <span class="source-line-no">138</span><span id="line-138"> quorumServers);</span> |
| <span class="source-line-no">139</span><span id="line-139"> this.identifier = identifier;</span> |
| <span class="source-line-no">140</span><span id="line-140"> this.id = Bytes.toBytes(identifier);</span> |
| <span class="source-line-no">141</span><span id="line-141"></span> |
| <span class="source-line-no">142</span><span id="line-142"> this.watcher = watcher;</span> |
| <span class="source-line-no">143</span><span id="line-143"> this.sessionTimeout = sessionTimeout;</span> |
| <span class="source-line-no">144</span><span id="line-144"> this.quorumServers = quorumServers;</span> |
| <span class="source-line-no">145</span><span id="line-145"> this.maxMultiSize = maxMultiSize;</span> |
| <span class="source-line-no">146</span><span id="line-146"> this.zkClientConfig = zkClientConfig;</span> |
| <span class="source-line-no">147</span><span id="line-147"> }</span> |
| <span class="source-line-no">148</span><span id="line-148"></span> |
| <span class="source-line-no">149</span><span id="line-149"> /**</span> |
| <span class="source-line-no">150</span><span id="line-150"> * Returns the maximum size (in bytes) that should be included in any single multi() call. NB:</span> |
| <span class="source-line-no">151</span><span id="line-151"> * This is an approximation, so there may be variance in the msg actually sent over the wire.</span> |
| <span class="source-line-no">152</span><span id="line-152"> * Please be sure to set this approximately, with respect to your ZK server configuration for</span> |
| <span class="source-line-no">153</span><span id="line-153"> * jute.maxbuffer.</span> |
| <span class="source-line-no">154</span><span id="line-154"> */</span> |
| <span class="source-line-no">155</span><span id="line-155"> public int getMaxMultiSizeLimit() {</span> |
| <span class="source-line-no">156</span><span id="line-156"> return maxMultiSize;</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"> /**</span> |
| <span class="source-line-no">160</span><span id="line-160"> * Try to create a ZooKeeper connection. Turns any exception encountered into a</span> |
| <span class="source-line-no">161</span><span id="line-161"> * KeeperException.OperationTimeoutException so it can retried.</span> |
| <span class="source-line-no">162</span><span id="line-162"> * @return The created ZooKeeper connection object</span> |
| <span class="source-line-no">163</span><span id="line-163"> * @throws KeeperException if a ZooKeeper operation fails</span> |
| <span class="source-line-no">164</span><span id="line-164"> */</span> |
| <span class="source-line-no">165</span><span id="line-165"> private synchronized ZooKeeper checkZk() throws KeeperException {</span> |
| <span class="source-line-no">166</span><span id="line-166"> if (this.zk == null) {</span> |
| <span class="source-line-no">167</span><span id="line-167"> try {</span> |
| <span class="source-line-no">168</span><span id="line-168"> this.zk = new ZooKeeper(quorumServers, sessionTimeout, watcher, zkClientConfig);</span> |
| <span class="source-line-no">169</span><span id="line-169"> } catch (IOException ex) {</span> |
| <span class="source-line-no">170</span><span id="line-170"> LOG.warn("Unable to create ZooKeeper Connection", ex);</span> |
| <span class="source-line-no">171</span><span id="line-171"> throw new KeeperException.OperationTimeoutException();</span> |
| <span class="source-line-no">172</span><span id="line-172"> }</span> |
| <span class="source-line-no">173</span><span id="line-173"> }</span> |
| <span class="source-line-no">174</span><span id="line-174"> return zk;</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"> public synchronized void reconnectAfterExpiration()</span> |
| <span class="source-line-no">178</span><span id="line-178"> throws IOException, KeeperException, InterruptedException {</span> |
| <span class="source-line-no">179</span><span id="line-179"> if (zk != null) {</span> |
| <span class="source-line-no">180</span><span id="line-180"> LOG.info("Closing dead ZooKeeper connection, session" + " was: 0x"</span> |
| <span class="source-line-no">181</span><span id="line-181"> + Long.toHexString(zk.getSessionId()));</span> |
| <span class="source-line-no">182</span><span id="line-182"> zk.close();</span> |
| <span class="source-line-no">183</span><span id="line-183"> // reset the ZooKeeper connection</span> |
| <span class="source-line-no">184</span><span id="line-184"> zk = null;</span> |
| <span class="source-line-no">185</span><span id="line-185"> }</span> |
| <span class="source-line-no">186</span><span id="line-186"> checkZk();</span> |
| <span class="source-line-no">187</span><span id="line-187"> LOG.info("Recreated a ZooKeeper, session" + " is: 0x" + Long.toHexString(zk.getSessionId()));</span> |
| <span class="source-line-no">188</span><span id="line-188"> }</span> |
| <span class="source-line-no">189</span><span id="line-189"></span> |
| <span class="source-line-no">190</span><span id="line-190"> /**</span> |
| <span class="source-line-no">191</span><span id="line-191"> * delete is an idempotent operation. Retry before throwing exception. This function will not</span> |
| <span class="source-line-no">192</span><span id="line-192"> * throw NoNodeException if the path does not exist.</span> |
| <span class="source-line-no">193</span><span id="line-193"> */</span> |
| <span class="source-line-no">194</span><span id="line-194"> public void delete(String path, int version) throws InterruptedException, KeeperException {</span> |
| <span class="source-line-no">195</span><span id="line-195"> final Span span = TraceUtil.createSpan("RecoverableZookeeper.delete");</span> |
| <span class="source-line-no">196</span><span id="line-196"> try (Scope ignored = span.makeCurrent()) {</span> |
| <span class="source-line-no">197</span><span id="line-197"> RetryCounter retryCounter = retryCounterFactory.create();</span> |
| <span class="source-line-no">198</span><span id="line-198"> boolean isRetry = false; // False for first attempt, true for all retries.</span> |
| <span class="source-line-no">199</span><span id="line-199"> while (true) {</span> |
| <span class="source-line-no">200</span><span id="line-200"> try {</span> |
| <span class="source-line-no">201</span><span id="line-201"> checkZk().delete(path, version);</span> |
| <span class="source-line-no">202</span><span id="line-202"> span.setStatus(StatusCode.OK);</span> |
| <span class="source-line-no">203</span><span id="line-203"> return;</span> |
| <span class="source-line-no">204</span><span id="line-204"> } catch (KeeperException e) {</span> |
| <span class="source-line-no">205</span><span id="line-205"> switch (e.code()) {</span> |
| <span class="source-line-no">206</span><span id="line-206"> case NONODE:</span> |
| <span class="source-line-no">207</span><span id="line-207"> if (isRetry) {</span> |
| <span class="source-line-no">208</span><span id="line-208"> LOG.debug(</span> |
| <span class="source-line-no">209</span><span id="line-209"> "Node " + path + " already deleted. Assuming a " + "previous attempt succeeded.");</span> |
| <span class="source-line-no">210</span><span id="line-210"> return;</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("Node {} already deleted, retry={}", path, isRetry);</span> |
| <span class="source-line-no">213</span><span id="line-213"> TraceUtil.setError(span, e);</span> |
| <span class="source-line-no">214</span><span id="line-214"> throw e;</span> |
| <span class="source-line-no">215</span><span id="line-215"></span> |
| <span class="source-line-no">216</span><span id="line-216"> case CONNECTIONLOSS:</span> |
| <span class="source-line-no">217</span><span id="line-217"> case OPERATIONTIMEOUT:</span> |
| <span class="source-line-no">218</span><span id="line-218"> case REQUESTTIMEOUT:</span> |
| <span class="source-line-no">219</span><span id="line-219"> TraceUtil.setError(span, e);</span> |
| <span class="source-line-no">220</span><span id="line-220"> retryOrThrow(retryCounter, e, "delete");</span> |
| <span class="source-line-no">221</span><span id="line-221"> break;</span> |
| <span class="source-line-no">222</span><span id="line-222"></span> |
| <span class="source-line-no">223</span><span id="line-223"> default:</span> |
| <span class="source-line-no">224</span><span id="line-224"> TraceUtil.setError(span, e);</span> |
| <span class="source-line-no">225</span><span id="line-225"> throw e;</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"> retryCounter.sleepUntilNextRetry();</span> |
| <span class="source-line-no">229</span><span id="line-229"> isRetry = true;</span> |
| <span class="source-line-no">230</span><span id="line-230"> }</span> |
| <span class="source-line-no">231</span><span id="line-231"> } finally {</span> |
| <span class="source-line-no">232</span><span id="line-232"> span.end();</span> |
| <span class="source-line-no">233</span><span id="line-233"> }</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"> /**</span> |
| <span class="source-line-no">237</span><span id="line-237"> * exists is an idempotent operation. Retry before throwing exception</span> |
| <span class="source-line-no">238</span><span id="line-238"> * @return A Stat instance</span> |
| <span class="source-line-no">239</span><span id="line-239"> */</span> |
| <span class="source-line-no">240</span><span id="line-240"> public Stat exists(String path, Watcher watcher) throws KeeperException, InterruptedException {</span> |
| <span class="source-line-no">241</span><span id="line-241"> return exists(path, watcher, null);</span> |
| <span class="source-line-no">242</span><span id="line-242"> }</span> |
| <span class="source-line-no">243</span><span id="line-243"></span> |
| <span class="source-line-no">244</span><span id="line-244"> private Stat exists(String path, Watcher watcher, Boolean watch)</span> |
| <span class="source-line-no">245</span><span id="line-245"> throws InterruptedException, KeeperException {</span> |
| <span class="source-line-no">246</span><span id="line-246"> final Span span = TraceUtil.createSpan("RecoverableZookeeper.exists");</span> |
| <span class="source-line-no">247</span><span id="line-247"> try (Scope ignored = span.makeCurrent()) {</span> |
| <span class="source-line-no">248</span><span id="line-248"> RetryCounter retryCounter = retryCounterFactory.create();</span> |
| <span class="source-line-no">249</span><span id="line-249"> while (true) {</span> |
| <span class="source-line-no">250</span><span id="line-250"> try {</span> |
| <span class="source-line-no">251</span><span id="line-251"> Stat nodeStat;</span> |
| <span class="source-line-no">252</span><span id="line-252"> if (watch == null) {</span> |
| <span class="source-line-no">253</span><span id="line-253"> nodeStat = checkZk().exists(path, watcher);</span> |
| <span class="source-line-no">254</span><span id="line-254"> } else {</span> |
| <span class="source-line-no">255</span><span id="line-255"> nodeStat = checkZk().exists(path, watch);</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.setStatus(StatusCode.OK);</span> |
| <span class="source-line-no">258</span><span id="line-258"> return nodeStat;</span> |
| <span class="source-line-no">259</span><span id="line-259"> } catch (KeeperException e) {</span> |
| <span class="source-line-no">260</span><span id="line-260"> switch (e.code()) {</span> |
| <span class="source-line-no">261</span><span id="line-261"> case CONNECTIONLOSS:</span> |
| <span class="source-line-no">262</span><span id="line-262"> case OPERATIONTIMEOUT:</span> |
| <span class="source-line-no">263</span><span id="line-263"> case REQUESTTIMEOUT:</span> |
| <span class="source-line-no">264</span><span id="line-264"> TraceUtil.setError(span, e);</span> |
| <span class="source-line-no">265</span><span id="line-265"> retryOrThrow(retryCounter, e, "exists");</span> |
| <span class="source-line-no">266</span><span id="line-266"> break;</span> |
| <span class="source-line-no">267</span><span id="line-267"></span> |
| <span class="source-line-no">268</span><span id="line-268"> default:</span> |
| <span class="source-line-no">269</span><span id="line-269"> TraceUtil.setError(span, e);</span> |
| <span class="source-line-no">270</span><span id="line-270"> throw e;</span> |
| <span class="source-line-no">271</span><span id="line-271"> }</span> |
| <span class="source-line-no">272</span><span id="line-272"> }</span> |
| <span class="source-line-no">273</span><span id="line-273"> retryCounter.sleepUntilNextRetry();</span> |
| <span class="source-line-no">274</span><span id="line-274"> }</span> |
| <span class="source-line-no">275</span><span id="line-275"> } finally {</span> |
| <span class="source-line-no">276</span><span id="line-276"> span.end();</span> |
| <span class="source-line-no">277</span><span id="line-277"> }</span> |
| <span class="source-line-no">278</span><span id="line-278"> }</span> |
| <span class="source-line-no">279</span><span id="line-279"></span> |
| <span class="source-line-no">280</span><span id="line-280"> /**</span> |
| <span class="source-line-no">281</span><span id="line-281"> * exists is an idempotent operation. Retry before throwing exception</span> |
| <span class="source-line-no">282</span><span id="line-282"> * @return A Stat instance</span> |
| <span class="source-line-no">283</span><span id="line-283"> */</span> |
| <span class="source-line-no">284</span><span id="line-284"> public Stat exists(String path, boolean watch) throws KeeperException, InterruptedException {</span> |
| <span class="source-line-no">285</span><span id="line-285"> return exists(path, null, watch);</span> |
| <span class="source-line-no">286</span><span id="line-286"> }</span> |
| <span class="source-line-no">287</span><span id="line-287"></span> |
| <span class="source-line-no">288</span><span id="line-288"> private void retryOrThrow(RetryCounter retryCounter, KeeperException e, String opName)</span> |
| <span class="source-line-no">289</span><span id="line-289"> throws KeeperException {</span> |
| <span class="source-line-no">290</span><span id="line-290"> if (!retryCounter.shouldRetry()) {</span> |
| <span class="source-line-no">291</span><span id="line-291"> LOG.error("ZooKeeper {} failed after {} attempts", opName, retryCounter.getMaxAttempts());</span> |
| <span class="source-line-no">292</span><span id="line-292"> throw e;</span> |
| <span class="source-line-no">293</span><span id="line-293"> }</span> |
| <span class="source-line-no">294</span><span id="line-294"> LOG.debug("Retry, connectivity issue (JVM Pause?); quorum={},exception{}=", quorumServers, e);</span> |
| <span class="source-line-no">295</span><span id="line-295"> }</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"> * getChildren is an idempotent operation. Retry before throwing exception</span> |
| <span class="source-line-no">299</span><span id="line-299"> * @return List of children znodes</span> |
| <span class="source-line-no">300</span><span id="line-300"> */</span> |
| <span class="source-line-no">301</span><span id="line-301"> public List<String> getChildren(String path, Watcher watcher)</span> |
| <span class="source-line-no">302</span><span id="line-302"> throws KeeperException, InterruptedException {</span> |
| <span class="source-line-no">303</span><span id="line-303"> return getChildren(path, watcher, null);</span> |
| <span class="source-line-no">304</span><span id="line-304"> }</span> |
| <span class="source-line-no">305</span><span id="line-305"></span> |
| <span class="source-line-no">306</span><span id="line-306"> private List<String> getChildren(String path, Watcher watcher, Boolean watch)</span> |
| <span class="source-line-no">307</span><span id="line-307"> throws InterruptedException, KeeperException {</span> |
| <span class="source-line-no">308</span><span id="line-308"> final Span span = TraceUtil.createSpan("RecoverableZookeeper.getChildren");</span> |
| <span class="source-line-no">309</span><span id="line-309"> try (Scope ignored = span.makeCurrent()) {</span> |
| <span class="source-line-no">310</span><span id="line-310"> RetryCounter retryCounter = retryCounterFactory.create();</span> |
| <span class="source-line-no">311</span><span id="line-311"> while (true) {</span> |
| <span class="source-line-no">312</span><span id="line-312"> try {</span> |
| <span class="source-line-no">313</span><span id="line-313"> List<String> children;</span> |
| <span class="source-line-no">314</span><span id="line-314"> if (watch == null) {</span> |
| <span class="source-line-no">315</span><span id="line-315"> children = checkZk().getChildren(path, watcher);</span> |
| <span class="source-line-no">316</span><span id="line-316"> } else {</span> |
| <span class="source-line-no">317</span><span id="line-317"> children = checkZk().getChildren(path, watch);</span> |
| <span class="source-line-no">318</span><span id="line-318"> }</span> |
| <span class="source-line-no">319</span><span id="line-319"> span.setStatus(StatusCode.OK);</span> |
| <span class="source-line-no">320</span><span id="line-320"> return children;</span> |
| <span class="source-line-no">321</span><span id="line-321"> } catch (KeeperException e) {</span> |
| <span class="source-line-no">322</span><span id="line-322"> switch (e.code()) {</span> |
| <span class="source-line-no">323</span><span id="line-323"> case CONNECTIONLOSS:</span> |
| <span class="source-line-no">324</span><span id="line-324"> case OPERATIONTIMEOUT:</span> |
| <span class="source-line-no">325</span><span id="line-325"> case REQUESTTIMEOUT:</span> |
| <span class="source-line-no">326</span><span id="line-326"> TraceUtil.setError(span, e);</span> |
| <span class="source-line-no">327</span><span id="line-327"> retryOrThrow(retryCounter, e, "getChildren");</span> |
| <span class="source-line-no">328</span><span id="line-328"> break;</span> |
| <span class="source-line-no">329</span><span id="line-329"></span> |
| <span class="source-line-no">330</span><span id="line-330"> default:</span> |
| <span class="source-line-no">331</span><span id="line-331"> TraceUtil.setError(span, e);</span> |
| <span class="source-line-no">332</span><span id="line-332"> throw e;</span> |
| <span class="source-line-no">333</span><span id="line-333"> }</span> |
| <span class="source-line-no">334</span><span id="line-334"> }</span> |
| <span class="source-line-no">335</span><span id="line-335"> retryCounter.sleepUntilNextRetry();</span> |
| <span class="source-line-no">336</span><span id="line-336"> }</span> |
| <span class="source-line-no">337</span><span id="line-337"> } finally {</span> |
| <span class="source-line-no">338</span><span id="line-338"> span.end();</span> |
| <span class="source-line-no">339</span><span id="line-339"> }</span> |
| <span class="source-line-no">340</span><span id="line-340"> }</span> |
| <span class="source-line-no">341</span><span id="line-341"></span> |
| <span class="source-line-no">342</span><span id="line-342"> /**</span> |
| <span class="source-line-no">343</span><span id="line-343"> * getChildren is an idempotent operation. Retry before throwing exception</span> |
| <span class="source-line-no">344</span><span id="line-344"> * @return List of children znodes</span> |
| <span class="source-line-no">345</span><span id="line-345"> */</span> |
| <span class="source-line-no">346</span><span id="line-346"> public List<String> getChildren(String path, boolean watch)</span> |
| <span class="source-line-no">347</span><span id="line-347"> throws KeeperException, InterruptedException {</span> |
| <span class="source-line-no">348</span><span id="line-348"> return getChildren(path, null, watch);</span> |
| <span class="source-line-no">349</span><span id="line-349"> }</span> |
| <span class="source-line-no">350</span><span id="line-350"></span> |
| <span class="source-line-no">351</span><span id="line-351"> /**</span> |
| <span class="source-line-no">352</span><span id="line-352"> * getData is an idempotent operation. Retry before throwing exception</span> |
| <span class="source-line-no">353</span><span id="line-353"> */</span> |
| <span class="source-line-no">354</span><span id="line-354"> public byte[] getData(String path, Watcher watcher, Stat stat)</span> |
| <span class="source-line-no">355</span><span id="line-355"> throws KeeperException, InterruptedException {</span> |
| <span class="source-line-no">356</span><span id="line-356"> return getData(path, watcher, null, stat);</span> |
| <span class="source-line-no">357</span><span id="line-357"> }</span> |
| <span class="source-line-no">358</span><span id="line-358"></span> |
| <span class="source-line-no">359</span><span id="line-359"> private byte[] getData(String path, Watcher watcher, Boolean watch, Stat stat)</span> |
| <span class="source-line-no">360</span><span id="line-360"> throws InterruptedException, KeeperException {</span> |
| <span class="source-line-no">361</span><span id="line-361"> final Span span = TraceUtil.createSpan("RecoverableZookeeper.getData");</span> |
| <span class="source-line-no">362</span><span id="line-362"> try (Scope ignored = span.makeCurrent()) {</span> |
| <span class="source-line-no">363</span><span id="line-363"> RetryCounter retryCounter = retryCounterFactory.create();</span> |
| <span class="source-line-no">364</span><span id="line-364"> while (true) {</span> |
| <span class="source-line-no">365</span><span id="line-365"> try {</span> |
| <span class="source-line-no">366</span><span id="line-366"> byte[] revData;</span> |
| <span class="source-line-no">367</span><span id="line-367"> if (watch == null) {</span> |
| <span class="source-line-no">368</span><span id="line-368"> revData = checkZk().getData(path, watcher, stat);</span> |
| <span class="source-line-no">369</span><span id="line-369"> } else {</span> |
| <span class="source-line-no">370</span><span id="line-370"> revData = checkZk().getData(path, watch, stat);</span> |
| <span class="source-line-no">371</span><span id="line-371"> }</span> |
| <span class="source-line-no">372</span><span id="line-372"> span.setStatus(StatusCode.OK);</span> |
| <span class="source-line-no">373</span><span id="line-373"> return ZKMetadata.removeMetaData(revData);</span> |
| <span class="source-line-no">374</span><span id="line-374"> } catch (KeeperException e) {</span> |
| <span class="source-line-no">375</span><span id="line-375"> switch (e.code()) {</span> |
| <span class="source-line-no">376</span><span id="line-376"> case CONNECTIONLOSS:</span> |
| <span class="source-line-no">377</span><span id="line-377"> case OPERATIONTIMEOUT:</span> |
| <span class="source-line-no">378</span><span id="line-378"> case REQUESTTIMEOUT:</span> |
| <span class="source-line-no">379</span><span id="line-379"> TraceUtil.setError(span, e);</span> |
| <span class="source-line-no">380</span><span id="line-380"> retryOrThrow(retryCounter, e, "getData");</span> |
| <span class="source-line-no">381</span><span id="line-381"> break;</span> |
| <span class="source-line-no">382</span><span id="line-382"></span> |
| <span class="source-line-no">383</span><span id="line-383"> default:</span> |
| <span class="source-line-no">384</span><span id="line-384"> TraceUtil.setError(span, e);</span> |
| <span class="source-line-no">385</span><span id="line-385"> throw e;</span> |
| <span class="source-line-no">386</span><span id="line-386"> }</span> |
| <span class="source-line-no">387</span><span id="line-387"> }</span> |
| <span class="source-line-no">388</span><span id="line-388"> retryCounter.sleepUntilNextRetry();</span> |
| <span class="source-line-no">389</span><span id="line-389"> }</span> |
| <span class="source-line-no">390</span><span id="line-390"> } finally {</span> |
| <span class="source-line-no">391</span><span id="line-391"> span.end();</span> |
| <span class="source-line-no">392</span><span id="line-392"> }</span> |
| <span class="source-line-no">393</span><span id="line-393"> }</span> |
| <span class="source-line-no">394</span><span id="line-394"></span> |
| <span class="source-line-no">395</span><span id="line-395"> /**</span> |
| <span class="source-line-no">396</span><span id="line-396"> * getData is an idempotent operation. Retry before throwing exception</span> |
| <span class="source-line-no">397</span><span id="line-397"> */</span> |
| <span class="source-line-no">398</span><span id="line-398"> public byte[] getData(String path, boolean watch, Stat stat)</span> |
| <span class="source-line-no">399</span><span id="line-399"> throws KeeperException, InterruptedException {</span> |
| <span class="source-line-no">400</span><span id="line-400"> return getData(path, null, watch, stat);</span> |
| <span class="source-line-no">401</span><span id="line-401"> }</span> |
| <span class="source-line-no">402</span><span id="line-402"></span> |
| <span class="source-line-no">403</span><span id="line-403"> /**</span> |
| <span class="source-line-no">404</span><span id="line-404"> * setData is NOT an idempotent operation. Retry may cause BadVersion Exception Adding an</span> |
| <span class="source-line-no">405</span><span id="line-405"> * identifier field into the data to check whether badversion is caused by the result of previous</span> |
| <span class="source-line-no">406</span><span id="line-406"> * correctly setData</span> |
| <span class="source-line-no">407</span><span id="line-407"> * @return Stat instance</span> |
| <span class="source-line-no">408</span><span id="line-408"> */</span> |
| <span class="source-line-no">409</span><span id="line-409"> public Stat setData(String path, byte[] data, int version)</span> |
| <span class="source-line-no">410</span><span id="line-410"> throws KeeperException, InterruptedException {</span> |
| <span class="source-line-no">411</span><span id="line-411"> final Span span = TraceUtil.createSpan("RecoverableZookeeper.setData");</span> |
| <span class="source-line-no">412</span><span id="line-412"> try (Scope ignored = span.makeCurrent()) {</span> |
| <span class="source-line-no">413</span><span id="line-413"> RetryCounter retryCounter = retryCounterFactory.create();</span> |
| <span class="source-line-no">414</span><span id="line-414"> byte[] newData = ZKMetadata.appendMetaData(id, data);</span> |
| <span class="source-line-no">415</span><span id="line-415"> boolean isRetry = false;</span> |
| <span class="source-line-no">416</span><span id="line-416"> while (true) {</span> |
| <span class="source-line-no">417</span><span id="line-417"> try {</span> |
| <span class="source-line-no">418</span><span id="line-418"> span.setStatus(StatusCode.OK);</span> |
| <span class="source-line-no">419</span><span id="line-419"> return checkZk().setData(path, newData, version);</span> |
| <span class="source-line-no">420</span><span id="line-420"> } catch (KeeperException e) {</span> |
| <span class="source-line-no">421</span><span id="line-421"> switch (e.code()) {</span> |
| <span class="source-line-no">422</span><span id="line-422"> case CONNECTIONLOSS:</span> |
| <span class="source-line-no">423</span><span id="line-423"> case OPERATIONTIMEOUT:</span> |
| <span class="source-line-no">424</span><span id="line-424"> case REQUESTTIMEOUT:</span> |
| <span class="source-line-no">425</span><span id="line-425"> TraceUtil.setError(span, e);</span> |
| <span class="source-line-no">426</span><span id="line-426"> retryOrThrow(retryCounter, e, "setData");</span> |
| <span class="source-line-no">427</span><span id="line-427"> break;</span> |
| <span class="source-line-no">428</span><span id="line-428"> case BADVERSION:</span> |
| <span class="source-line-no">429</span><span id="line-429"> if (isRetry) {</span> |
| <span class="source-line-no">430</span><span id="line-430"> // try to verify whether the previous setData success or not</span> |
| <span class="source-line-no">431</span><span id="line-431"> try {</span> |
| <span class="source-line-no">432</span><span id="line-432"> Stat stat = new Stat();</span> |
| <span class="source-line-no">433</span><span id="line-433"> byte[] revData = checkZk().getData(path, false, stat);</span> |
| <span class="source-line-no">434</span><span id="line-434"> if (Bytes.compareTo(revData, newData) == 0) {</span> |
| <span class="source-line-no">435</span><span id="line-435"> // the bad version is caused by previous successful setData</span> |
| <span class="source-line-no">436</span><span id="line-436"> return stat;</span> |
| <span class="source-line-no">437</span><span id="line-437"> }</span> |
| <span class="source-line-no">438</span><span id="line-438"> } catch (KeeperException keeperException) {</span> |
| <span class="source-line-no">439</span><span id="line-439"> // the ZK is not reliable at this moment. just throwing exception</span> |
| <span class="source-line-no">440</span><span id="line-440"> TraceUtil.setError(span, e);</span> |
| <span class="source-line-no">441</span><span id="line-441"> throw keeperException;</span> |
| <span class="source-line-no">442</span><span id="line-442"> }</span> |
| <span class="source-line-no">443</span><span id="line-443"> }</span> |
| <span class="source-line-no">444</span><span id="line-444"> // throw other exceptions and verified bad version exceptions</span> |
| <span class="source-line-no">445</span><span id="line-445"> default:</span> |
| <span class="source-line-no">446</span><span id="line-446"> TraceUtil.setError(span, e);</span> |
| <span class="source-line-no">447</span><span id="line-447"> throw e;</span> |
| <span class="source-line-no">448</span><span id="line-448"> }</span> |
| <span class="source-line-no">449</span><span id="line-449"> }</span> |
| <span class="source-line-no">450</span><span id="line-450"> retryCounter.sleepUntilNextRetry();</span> |
| <span class="source-line-no">451</span><span id="line-451"> isRetry = true;</span> |
| <span class="source-line-no">452</span><span id="line-452"> }</span> |
| <span class="source-line-no">453</span><span id="line-453"> } finally {</span> |
| <span class="source-line-no">454</span><span id="line-454"> span.end();</span> |
| <span class="source-line-no">455</span><span id="line-455"> }</span> |
| <span class="source-line-no">456</span><span id="line-456"> }</span> |
| <span class="source-line-no">457</span><span id="line-457"></span> |
| <span class="source-line-no">458</span><span id="line-458"> /**</span> |
| <span class="source-line-no">459</span><span id="line-459"> * getAcl is an idempotent operation. Retry before throwing exception</span> |
| <span class="source-line-no">460</span><span id="line-460"> * @return list of ACLs</span> |
| <span class="source-line-no">461</span><span id="line-461"> */</span> |
| <span class="source-line-no">462</span><span id="line-462"> public List<ACL> getAcl(String path, Stat stat) throws KeeperException, InterruptedException {</span> |
| <span class="source-line-no">463</span><span id="line-463"> final Span span = TraceUtil.createSpan("RecoverableZookeeper.getAcl");</span> |
| <span class="source-line-no">464</span><span id="line-464"> try (Scope ignored = span.makeCurrent()) {</span> |
| <span class="source-line-no">465</span><span id="line-465"> RetryCounter retryCounter = retryCounterFactory.create();</span> |
| <span class="source-line-no">466</span><span id="line-466"> while (true) {</span> |
| <span class="source-line-no">467</span><span id="line-467"> try {</span> |
| <span class="source-line-no">468</span><span id="line-468"> span.setStatus(StatusCode.OK);</span> |
| <span class="source-line-no">469</span><span id="line-469"> return checkZk().getACL(path, stat);</span> |
| <span class="source-line-no">470</span><span id="line-470"> } catch (KeeperException e) {</span> |
| <span class="source-line-no">471</span><span id="line-471"> switch (e.code()) {</span> |
| <span class="source-line-no">472</span><span id="line-472"> case CONNECTIONLOSS:</span> |
| <span class="source-line-no">473</span><span id="line-473"> case OPERATIONTIMEOUT:</span> |
| <span class="source-line-no">474</span><span id="line-474"> case REQUESTTIMEOUT:</span> |
| <span class="source-line-no">475</span><span id="line-475"> TraceUtil.setError(span, e);</span> |
| <span class="source-line-no">476</span><span id="line-476"> retryOrThrow(retryCounter, e, "getAcl");</span> |
| <span class="source-line-no">477</span><span id="line-477"> break;</span> |
| <span class="source-line-no">478</span><span id="line-478"></span> |
| <span class="source-line-no">479</span><span id="line-479"> default:</span> |
| <span class="source-line-no">480</span><span id="line-480"> TraceUtil.setError(span, e);</span> |
| <span class="source-line-no">481</span><span id="line-481"> throw e;</span> |
| <span class="source-line-no">482</span><span id="line-482"> }</span> |
| <span class="source-line-no">483</span><span id="line-483"> }</span> |
| <span class="source-line-no">484</span><span id="line-484"> retryCounter.sleepUntilNextRetry();</span> |
| <span class="source-line-no">485</span><span id="line-485"> }</span> |
| <span class="source-line-no">486</span><span id="line-486"> } finally {</span> |
| <span class="source-line-no">487</span><span id="line-487"> span.end();</span> |
| <span class="source-line-no">488</span><span id="line-488"> }</span> |
| <span class="source-line-no">489</span><span id="line-489"> }</span> |
| <span class="source-line-no">490</span><span id="line-490"></span> |
| <span class="source-line-no">491</span><span id="line-491"> /**</span> |
| <span class="source-line-no">492</span><span id="line-492"> * setAcl is an idempotent operation. Retry before throwing exception</span> |
| <span class="source-line-no">493</span><span id="line-493"> * @return list of ACLs</span> |
| <span class="source-line-no">494</span><span id="line-494"> */</span> |
| <span class="source-line-no">495</span><span id="line-495"> public Stat setAcl(String path, List<ACL> acls, int version)</span> |
| <span class="source-line-no">496</span><span id="line-496"> throws KeeperException, InterruptedException {</span> |
| <span class="source-line-no">497</span><span id="line-497"> final Span span = TraceUtil.createSpan("RecoverableZookeeper.setAcl");</span> |
| <span class="source-line-no">498</span><span id="line-498"> try (Scope ignored = span.makeCurrent()) {</span> |
| <span class="source-line-no">499</span><span id="line-499"> RetryCounter retryCounter = retryCounterFactory.create();</span> |
| <span class="source-line-no">500</span><span id="line-500"> while (true) {</span> |
| <span class="source-line-no">501</span><span id="line-501"> try {</span> |
| <span class="source-line-no">502</span><span id="line-502"> span.setStatus(StatusCode.OK);</span> |
| <span class="source-line-no">503</span><span id="line-503"> return checkZk().setACL(path, acls, version);</span> |
| <span class="source-line-no">504</span><span id="line-504"> } catch (KeeperException e) {</span> |
| <span class="source-line-no">505</span><span id="line-505"> switch (e.code()) {</span> |
| <span class="source-line-no">506</span><span id="line-506"> case CONNECTIONLOSS:</span> |
| <span class="source-line-no">507</span><span id="line-507"> case OPERATIONTIMEOUT:</span> |
| <span class="source-line-no">508</span><span id="line-508"> TraceUtil.setError(span, e);</span> |
| <span class="source-line-no">509</span><span id="line-509"> retryOrThrow(retryCounter, e, "setAcl");</span> |
| <span class="source-line-no">510</span><span id="line-510"> break;</span> |
| <span class="source-line-no">511</span><span id="line-511"></span> |
| <span class="source-line-no">512</span><span id="line-512"> default:</span> |
| <span class="source-line-no">513</span><span id="line-513"> TraceUtil.setError(span, e);</span> |
| <span class="source-line-no">514</span><span id="line-514"> throw e;</span> |
| <span class="source-line-no">515</span><span id="line-515"> }</span> |
| <span class="source-line-no">516</span><span id="line-516"> }</span> |
| <span class="source-line-no">517</span><span id="line-517"> retryCounter.sleepUntilNextRetry();</span> |
| <span class="source-line-no">518</span><span id="line-518"> }</span> |
| <span class="source-line-no">519</span><span id="line-519"> } finally {</span> |
| <span class="source-line-no">520</span><span id="line-520"> span.end();</span> |
| <span class="source-line-no">521</span><span id="line-521"> }</span> |
| <span class="source-line-no">522</span><span id="line-522"> }</span> |
| <span class="source-line-no">523</span><span id="line-523"></span> |
| <span class="source-line-no">524</span><span id="line-524"> /**</span> |
| <span class="source-line-no">525</span><span id="line-525"> * <p></span> |
| <span class="source-line-no">526</span><span id="line-526"> * NONSEQUENTIAL create is idempotent operation. Retry before throwing exceptions. But this</span> |
| <span class="source-line-no">527</span><span id="line-527"> * function will not throw the NodeExist exception back to the application.</span> |
| <span class="source-line-no">528</span><span id="line-528"> * </p></span> |
| <span class="source-line-no">529</span><span id="line-529"> * <p></span> |
| <span class="source-line-no">530</span><span id="line-530"> * But SEQUENTIAL is NOT idempotent operation. It is necessary to add identifier to the path to</span> |
| <span class="source-line-no">531</span><span id="line-531"> * verify, whether the previous one is successful or not.</span> |
| <span class="source-line-no">532</span><span id="line-532"> * </p></span> |
| <span class="source-line-no">533</span><span id="line-533"> */</span> |
| <span class="source-line-no">534</span><span id="line-534"> public String create(String path, byte[] data, List<ACL> acl, CreateMode createMode)</span> |
| <span class="source-line-no">535</span><span id="line-535"> throws KeeperException, InterruptedException {</span> |
| <span class="source-line-no">536</span><span id="line-536"> final Span span = TraceUtil.createSpan("RecoverableZookeeper.create");</span> |
| <span class="source-line-no">537</span><span id="line-537"> try (Scope ignored = span.makeCurrent()) {</span> |
| <span class="source-line-no">538</span><span id="line-538"> byte[] newData = ZKMetadata.appendMetaData(id, data);</span> |
| <span class="source-line-no">539</span><span id="line-539"> switch (createMode) {</span> |
| <span class="source-line-no">540</span><span id="line-540"> case EPHEMERAL:</span> |
| <span class="source-line-no">541</span><span id="line-541"> case PERSISTENT:</span> |
| <span class="source-line-no">542</span><span id="line-542"> span.setStatus(StatusCode.OK);</span> |
| <span class="source-line-no">543</span><span id="line-543"> return createNonSequential(path, newData, acl, createMode);</span> |
| <span class="source-line-no">544</span><span id="line-544"></span> |
| <span class="source-line-no">545</span><span id="line-545"> case EPHEMERAL_SEQUENTIAL:</span> |
| <span class="source-line-no">546</span><span id="line-546"> case PERSISTENT_SEQUENTIAL:</span> |
| <span class="source-line-no">547</span><span id="line-547"> span.setStatus(StatusCode.OK);</span> |
| <span class="source-line-no">548</span><span id="line-548"> return createSequential(path, newData, acl, createMode);</span> |
| <span class="source-line-no">549</span><span id="line-549"></span> |
| <span class="source-line-no">550</span><span id="line-550"> default:</span> |
| <span class="source-line-no">551</span><span id="line-551"> final IllegalArgumentException e =</span> |
| <span class="source-line-no">552</span><span id="line-552"> new IllegalArgumentException("Unrecognized CreateMode: " + createMode);</span> |
| <span class="source-line-no">553</span><span id="line-553"> TraceUtil.setError(span, e);</span> |
| <span class="source-line-no">554</span><span id="line-554"> throw e;</span> |
| <span class="source-line-no">555</span><span id="line-555"> }</span> |
| <span class="source-line-no">556</span><span id="line-556"> } finally {</span> |
| <span class="source-line-no">557</span><span id="line-557"> span.end();</span> |
| <span class="source-line-no">558</span><span id="line-558"> }</span> |
| <span class="source-line-no">559</span><span id="line-559"> }</span> |
| <span class="source-line-no">560</span><span id="line-560"></span> |
| <span class="source-line-no">561</span><span id="line-561"> private String createNonSequential(String path, byte[] data, List<ACL> acl, CreateMode createMode)</span> |
| <span class="source-line-no">562</span><span id="line-562"> throws KeeperException, InterruptedException {</span> |
| <span class="source-line-no">563</span><span id="line-563"> RetryCounter retryCounter = retryCounterFactory.create();</span> |
| <span class="source-line-no">564</span><span id="line-564"> boolean isRetry = false; // False for first attempt, true for all retries.</span> |
| <span class="source-line-no">565</span><span id="line-565"> while (true) {</span> |
| <span class="source-line-no">566</span><span id="line-566"> try {</span> |
| <span class="source-line-no">567</span><span id="line-567"> return checkZk().create(path, data, acl, createMode);</span> |
| <span class="source-line-no">568</span><span id="line-568"> } catch (KeeperException e) {</span> |
| <span class="source-line-no">569</span><span id="line-569"> switch (e.code()) {</span> |
| <span class="source-line-no">570</span><span id="line-570"> case NODEEXISTS:</span> |
| <span class="source-line-no">571</span><span id="line-571"> if (isRetry) {</span> |
| <span class="source-line-no">572</span><span id="line-572"> // If the connection was lost, there is still a possibility that</span> |
| <span class="source-line-no">573</span><span id="line-573"> // we have successfully created the node at our previous attempt,</span> |
| <span class="source-line-no">574</span><span id="line-574"> // so we read the node and compare.</span> |
| <span class="source-line-no">575</span><span id="line-575"> byte[] currentData = checkZk().getData(path, false, null);</span> |
| <span class="source-line-no">576</span><span id="line-576"> if (currentData != null && Bytes.compareTo(currentData, data) == 0) {</span> |
| <span class="source-line-no">577</span><span id="line-577"> // We successfully created a non-sequential node</span> |
| <span class="source-line-no">578</span><span id="line-578"> return path;</span> |
| <span class="source-line-no">579</span><span id="line-579"> }</span> |
| <span class="source-line-no">580</span><span id="line-580"> LOG.error("Node " + path + " already exists with " + Bytes.toStringBinary(currentData)</span> |
| <span class="source-line-no">581</span><span id="line-581"> + ", could not write " + Bytes.toStringBinary(data));</span> |
| <span class="source-line-no">582</span><span id="line-582"> throw e;</span> |
| <span class="source-line-no">583</span><span id="line-583"> }</span> |
| <span class="source-line-no">584</span><span id="line-584"> LOG.trace("Node {} already exists", path);</span> |
| <span class="source-line-no">585</span><span id="line-585"> throw e;</span> |
| <span class="source-line-no">586</span><span id="line-586"></span> |
| <span class="source-line-no">587</span><span id="line-587"> case CONNECTIONLOSS:</span> |
| <span class="source-line-no">588</span><span id="line-588"> case OPERATIONTIMEOUT:</span> |
| <span class="source-line-no">589</span><span id="line-589"> case REQUESTTIMEOUT:</span> |
| <span class="source-line-no">590</span><span id="line-590"> retryOrThrow(retryCounter, e, "create");</span> |
| <span class="source-line-no">591</span><span id="line-591"> break;</span> |
| <span class="source-line-no">592</span><span id="line-592"></span> |
| <span class="source-line-no">593</span><span id="line-593"> default:</span> |
| <span class="source-line-no">594</span><span id="line-594"> throw e;</span> |
| <span class="source-line-no">595</span><span id="line-595"> }</span> |
| <span class="source-line-no">596</span><span id="line-596"> }</span> |
| <span class="source-line-no">597</span><span id="line-597"> retryCounter.sleepUntilNextRetry();</span> |
| <span class="source-line-no">598</span><span id="line-598"> isRetry = true;</span> |
| <span class="source-line-no">599</span><span id="line-599"> }</span> |
| <span class="source-line-no">600</span><span id="line-600"> }</span> |
| <span class="source-line-no">601</span><span id="line-601"></span> |
| <span class="source-line-no">602</span><span id="line-602"> private String createSequential(String path, byte[] data, List<ACL> acl, CreateMode createMode)</span> |
| <span class="source-line-no">603</span><span id="line-603"> throws KeeperException, InterruptedException {</span> |
| <span class="source-line-no">604</span><span id="line-604"> RetryCounter retryCounter = retryCounterFactory.create();</span> |
| <span class="source-line-no">605</span><span id="line-605"> boolean first = true;</span> |
| <span class="source-line-no">606</span><span id="line-606"> String newPath = path + this.identifier;</span> |
| <span class="source-line-no">607</span><span id="line-607"> while (true) {</span> |
| <span class="source-line-no">608</span><span id="line-608"> try {</span> |
| <span class="source-line-no">609</span><span id="line-609"> if (!first) {</span> |
| <span class="source-line-no">610</span><span id="line-610"> // Check if we succeeded on a previous attempt</span> |
| <span class="source-line-no">611</span><span id="line-611"> String previousResult = findPreviousSequentialNode(newPath);</span> |
| <span class="source-line-no">612</span><span id="line-612"> if (previousResult != null) {</span> |
| <span class="source-line-no">613</span><span id="line-613"> return previousResult;</span> |
| <span class="source-line-no">614</span><span id="line-614"> }</span> |
| <span class="source-line-no">615</span><span id="line-615"> }</span> |
| <span class="source-line-no">616</span><span id="line-616"> first = false;</span> |
| <span class="source-line-no">617</span><span id="line-617"> return checkZk().create(newPath, data, acl, createMode);</span> |
| <span class="source-line-no">618</span><span id="line-618"> } catch (KeeperException e) {</span> |
| <span class="source-line-no">619</span><span id="line-619"> switch (e.code()) {</span> |
| <span class="source-line-no">620</span><span id="line-620"> case CONNECTIONLOSS:</span> |
| <span class="source-line-no">621</span><span id="line-621"> case OPERATIONTIMEOUT:</span> |
| <span class="source-line-no">622</span><span id="line-622"> case REQUESTTIMEOUT:</span> |
| <span class="source-line-no">623</span><span id="line-623"> retryOrThrow(retryCounter, e, "create");</span> |
| <span class="source-line-no">624</span><span id="line-624"> break;</span> |
| <span class="source-line-no">625</span><span id="line-625"></span> |
| <span class="source-line-no">626</span><span id="line-626"> default:</span> |
| <span class="source-line-no">627</span><span id="line-627"> throw e;</span> |
| <span class="source-line-no">628</span><span id="line-628"> }</span> |
| <span class="source-line-no">629</span><span id="line-629"> }</span> |
| <span class="source-line-no">630</span><span id="line-630"> retryCounter.sleepUntilNextRetry();</span> |
| <span class="source-line-no">631</span><span id="line-631"> }</span> |
| <span class="source-line-no">632</span><span id="line-632"> }</span> |
| <span class="source-line-no">633</span><span id="line-633"></span> |
| <span class="source-line-no">634</span><span id="line-634"> /**</span> |
| <span class="source-line-no">635</span><span id="line-635"> * Convert Iterable of {@link org.apache.zookeeper.Op} we got into the ZooKeeper.Op instances to</span> |
| <span class="source-line-no">636</span><span id="line-636"> * actually pass to multi (need to do this in order to appendMetaData).</span> |
| <span class="source-line-no">637</span><span id="line-637"> */</span> |
| <span class="source-line-no">638</span><span id="line-638"> private Iterable<Op> prepareZKMulti(Iterable<Op> ops) throws UnsupportedOperationException {</span> |
| <span class="source-line-no">639</span><span id="line-639"> if (ops == null) {</span> |
| <span class="source-line-no">640</span><span id="line-640"> return null;</span> |
| <span class="source-line-no">641</span><span id="line-641"> }</span> |
| <span class="source-line-no">642</span><span id="line-642"></span> |
| <span class="source-line-no">643</span><span id="line-643"> List<Op> preparedOps = new LinkedList<>();</span> |
| <span class="source-line-no">644</span><span id="line-644"> for (Op op : ops) {</span> |
| <span class="source-line-no">645</span><span id="line-645"> if (op.getType() == ZooDefs.OpCode.create) {</span> |
| <span class="source-line-no">646</span><span id="line-646"> CreateRequest create = (CreateRequest) op.toRequestRecord();</span> |
| <span class="source-line-no">647</span><span id="line-647"> preparedOps.add(Op.create(create.getPath(), ZKMetadata.appendMetaData(id, create.getData()),</span> |
| <span class="source-line-no">648</span><span id="line-648"> create.getAcl(), create.getFlags()));</span> |
| <span class="source-line-no">649</span><span id="line-649"> } else if (op.getType() == ZooDefs.OpCode.delete) {</span> |
| <span class="source-line-no">650</span><span id="line-650"> // no need to appendMetaData for delete</span> |
| <span class="source-line-no">651</span><span id="line-651"> preparedOps.add(op);</span> |
| <span class="source-line-no">652</span><span id="line-652"> } else if (op.getType() == ZooDefs.OpCode.setData) {</span> |
| <span class="source-line-no">653</span><span id="line-653"> SetDataRequest setData = (SetDataRequest) op.toRequestRecord();</span> |
| <span class="source-line-no">654</span><span id="line-654"> preparedOps.add(Op.setData(setData.getPath(),</span> |
| <span class="source-line-no">655</span><span id="line-655"> ZKMetadata.appendMetaData(id, setData.getData()), setData.getVersion()));</span> |
| <span class="source-line-no">656</span><span id="line-656"> } else {</span> |
| <span class="source-line-no">657</span><span id="line-657"> throw new UnsupportedOperationException("Unexpected ZKOp type: " + op.getClass().getName());</span> |
| <span class="source-line-no">658</span><span id="line-658"> }</span> |
| <span class="source-line-no">659</span><span id="line-659"> }</span> |
| <span class="source-line-no">660</span><span id="line-660"> return preparedOps;</span> |
| <span class="source-line-no">661</span><span id="line-661"> }</span> |
| <span class="source-line-no">662</span><span id="line-662"></span> |
| <span class="source-line-no">663</span><span id="line-663"> /**</span> |
| <span class="source-line-no">664</span><span id="line-664"> * Run multiple operations in a transactional manner. Retry before throwing exception</span> |
| <span class="source-line-no">665</span><span id="line-665"> */</span> |
| <span class="source-line-no">666</span><span id="line-666"> public List<OpResult> multi(Iterable<Op> ops) throws KeeperException, InterruptedException {</span> |
| <span class="source-line-no">667</span><span id="line-667"> final Span span = TraceUtil.createSpan("RecoverableZookeeper.multi");</span> |
| <span class="source-line-no">668</span><span id="line-668"> try (Scope ignored = span.makeCurrent()) {</span> |
| <span class="source-line-no">669</span><span id="line-669"> RetryCounter retryCounter = retryCounterFactory.create();</span> |
| <span class="source-line-no">670</span><span id="line-670"> Iterable<Op> multiOps = prepareZKMulti(ops);</span> |
| <span class="source-line-no">671</span><span id="line-671"> while (true) {</span> |
| <span class="source-line-no">672</span><span id="line-672"> try {</span> |
| <span class="source-line-no">673</span><span id="line-673"> span.setStatus(StatusCode.OK);</span> |
| <span class="source-line-no">674</span><span id="line-674"> return checkZk().multi(multiOps);</span> |
| <span class="source-line-no">675</span><span id="line-675"> } catch (KeeperException e) {</span> |
| <span class="source-line-no">676</span><span id="line-676"> switch (e.code()) {</span> |
| <span class="source-line-no">677</span><span id="line-677"> case CONNECTIONLOSS:</span> |
| <span class="source-line-no">678</span><span id="line-678"> case OPERATIONTIMEOUT:</span> |
| <span class="source-line-no">679</span><span id="line-679"> case REQUESTTIMEOUT:</span> |
| <span class="source-line-no">680</span><span id="line-680"> TraceUtil.setError(span, e);</span> |
| <span class="source-line-no">681</span><span id="line-681"> retryOrThrow(retryCounter, e, "multi");</span> |
| <span class="source-line-no">682</span><span id="line-682"> break;</span> |
| <span class="source-line-no">683</span><span id="line-683"></span> |
| <span class="source-line-no">684</span><span id="line-684"> default:</span> |
| <span class="source-line-no">685</span><span id="line-685"> TraceUtil.setError(span, e);</span> |
| <span class="source-line-no">686</span><span id="line-686"> throw e;</span> |
| <span class="source-line-no">687</span><span id="line-687"> }</span> |
| <span class="source-line-no">688</span><span id="line-688"> }</span> |
| <span class="source-line-no">689</span><span id="line-689"> retryCounter.sleepUntilNextRetry();</span> |
| <span class="source-line-no">690</span><span id="line-690"> }</span> |
| <span class="source-line-no">691</span><span id="line-691"> } finally {</span> |
| <span class="source-line-no">692</span><span id="line-692"> span.end();</span> |
| <span class="source-line-no">693</span><span id="line-693"> }</span> |
| <span class="source-line-no">694</span><span id="line-694"> }</span> |
| <span class="source-line-no">695</span><span id="line-695"></span> |
| <span class="source-line-no">696</span><span id="line-696"> private String findPreviousSequentialNode(String path)</span> |
| <span class="source-line-no">697</span><span id="line-697"> throws KeeperException, InterruptedException {</span> |
| <span class="source-line-no">698</span><span id="line-698"> int lastSlashIdx = path.lastIndexOf('/');</span> |
| <span class="source-line-no">699</span><span id="line-699"> assert (lastSlashIdx != -1);</span> |
| <span class="source-line-no">700</span><span id="line-700"> String parent = path.substring(0, lastSlashIdx);</span> |
| <span class="source-line-no">701</span><span id="line-701"> String nodePrefix = path.substring(lastSlashIdx + 1);</span> |
| <span class="source-line-no">702</span><span id="line-702"> List<String> nodes = checkZk().getChildren(parent, false);</span> |
| <span class="source-line-no">703</span><span id="line-703"> List<String> matching = filterByPrefix(nodes, nodePrefix);</span> |
| <span class="source-line-no">704</span><span id="line-704"> for (String node : matching) {</span> |
| <span class="source-line-no">705</span><span id="line-705"> String nodePath = parent + "/" + node;</span> |
| <span class="source-line-no">706</span><span id="line-706"> Stat stat = checkZk().exists(nodePath, false);</span> |
| <span class="source-line-no">707</span><span id="line-707"> if (stat != null) {</span> |
| <span class="source-line-no">708</span><span id="line-708"> return nodePath;</span> |
| <span class="source-line-no">709</span><span id="line-709"> }</span> |
| <span class="source-line-no">710</span><span id="line-710"> }</span> |
| <span class="source-line-no">711</span><span id="line-711"> return null;</span> |
| <span class="source-line-no">712</span><span id="line-712"> }</span> |
| <span class="source-line-no">713</span><span id="line-713"></span> |
| <span class="source-line-no">714</span><span id="line-714"> public synchronized long getSessionId() {</span> |
| <span class="source-line-no">715</span><span id="line-715"> return zk == null ? -1 : zk.getSessionId();</span> |
| <span class="source-line-no">716</span><span id="line-716"> }</span> |
| <span class="source-line-no">717</span><span id="line-717"></span> |
| <span class="source-line-no">718</span><span id="line-718"> public synchronized void close() throws InterruptedException {</span> |
| <span class="source-line-no">719</span><span id="line-719"> if (zk != null) {</span> |
| <span class="source-line-no">720</span><span id="line-720"> zk.close();</span> |
| <span class="source-line-no">721</span><span id="line-721"> }</span> |
| <span class="source-line-no">722</span><span id="line-722"> }</span> |
| <span class="source-line-no">723</span><span id="line-723"></span> |
| <span class="source-line-no">724</span><span id="line-724"> public synchronized States getState() {</span> |
| <span class="source-line-no">725</span><span id="line-725"> return zk == null ? null : zk.getState();</span> |
| <span class="source-line-no">726</span><span id="line-726"> }</span> |
| <span class="source-line-no">727</span><span id="line-727"></span> |
| <span class="source-line-no">728</span><span id="line-728"> public synchronized ZooKeeper getZooKeeper() {</span> |
| <span class="source-line-no">729</span><span id="line-729"> return zk;</span> |
| <span class="source-line-no">730</span><span id="line-730"> }</span> |
| <span class="source-line-no">731</span><span id="line-731"></span> |
| <span class="source-line-no">732</span><span id="line-732"> public void sync(String path, AsyncCallback.VoidCallback cb, Object ctx) throws KeeperException {</span> |
| <span class="source-line-no">733</span><span id="line-733"> checkZk().sync(path, cb, ctx);</span> |
| <span class="source-line-no">734</span><span id="line-734"> }</span> |
| <span class="source-line-no">735</span><span id="line-735"></span> |
| <span class="source-line-no">736</span><span id="line-736"> /**</span> |
| <span class="source-line-no">737</span><span id="line-737"> * Filters the given node list by the given prefixes. This method is all-inclusive--if any element</span> |
| <span class="source-line-no">738</span><span id="line-738"> * in the node list starts with any of the given prefixes, then it is included in the result.</span> |
| <span class="source-line-no">739</span><span id="line-739"> * @param nodes the nodes to filter</span> |
| <span class="source-line-no">740</span><span id="line-740"> * @param prefixes the prefixes to include in the result</span> |
| <span class="source-line-no">741</span><span id="line-741"> * @return list of every element that starts with one of the prefixes</span> |
| <span class="source-line-no">742</span><span id="line-742"> */</span> |
| <span class="source-line-no">743</span><span id="line-743"> private static List<String> filterByPrefix(List<String> nodes, String... prefixes) {</span> |
| <span class="source-line-no">744</span><span id="line-744"> List<String> lockChildren = new ArrayList<>();</span> |
| <span class="source-line-no">745</span><span id="line-745"> for (String child : nodes) {</span> |
| <span class="source-line-no">746</span><span id="line-746"> for (String prefix : prefixes) {</span> |
| <span class="source-line-no">747</span><span id="line-747"> if (child.startsWith(prefix)) {</span> |
| <span class="source-line-no">748</span><span id="line-748"> lockChildren.add(child);</span> |
| <span class="source-line-no">749</span><span id="line-749"> break;</span> |
| <span class="source-line-no">750</span><span id="line-750"> }</span> |
| <span class="source-line-no">751</span><span id="line-751"> }</span> |
| <span class="source-line-no">752</span><span id="line-752"> }</span> |
| <span class="source-line-no">753</span><span id="line-753"> return lockChildren;</span> |
| <span class="source-line-no">754</span><span id="line-754"> }</span> |
| <span class="source-line-no">755</span><span id="line-755"></span> |
| <span class="source-line-no">756</span><span id="line-756"> public String getIdentifier() {</span> |
| <span class="source-line-no">757</span><span id="line-757"> return identifier;</span> |
| <span class="source-line-no">758</span><span id="line-758"> }</span> |
| <span class="source-line-no">759</span><span id="line-759">}</span> |
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| </pre> |
| </div> |
| </main> |
| </body> |
| </html> |
