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| <pre><span class="source-line-no">001</span><span id="line-1">/*</span> |
| <span class="source-line-no">002</span><span id="line-2"> * Licensed to the Apache Software Foundation (ASF) under one</span> |
| <span class="source-line-no">003</span><span id="line-3"> * or more contributor license agreements. See the NOTICE file</span> |
| <span class="source-line-no">004</span><span id="line-4"> * distributed with this work for additional information</span> |
| <span class="source-line-no">005</span><span id="line-5"> * regarding copyright ownership. The ASF licenses this file</span> |
| <span class="source-line-no">006</span><span id="line-6"> * to you under the Apache License, Version 2.0 (the</span> |
| <span class="source-line-no">007</span><span id="line-7"> * "License"); you may not use this file except in compliance</span> |
| <span class="source-line-no">008</span><span id="line-8"> * with the License. You may obtain a copy of the License at</span> |
| <span class="source-line-no">009</span><span id="line-9"> *</span> |
| <span class="source-line-no">010</span><span id="line-10"> * http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="source-line-no">011</span><span id="line-11"> *</span> |
| <span class="source-line-no">012</span><span id="line-12"> * Unless required by applicable law or agreed to in writing, software</span> |
| <span class="source-line-no">013</span><span id="line-13"> * distributed under the License is distributed on an "AS IS" BASIS,</span> |
| <span class="source-line-no">014</span><span id="line-14"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span> |
| <span class="source-line-no">015</span><span id="line-15"> * See the License for the specific language governing permissions and</span> |
| <span class="source-line-no">016</span><span id="line-16"> * limitations under the License.</span> |
| <span class="source-line-no">017</span><span id="line-17"> */</span> |
| <span class="source-line-no">018</span><span id="line-18">package org.apache.hadoop.hbase.zookeeper;</span> |
| <span class="source-line-no">019</span><span id="line-19"></span> |
| <span class="source-line-no">020</span><span id="line-20">import static org.apache.hadoop.hbase.HConstants.DEFAULT_ZK_SESSION_TIMEOUT;</span> |
| <span class="source-line-no">021</span><span id="line-21">import static org.apache.hadoop.hbase.HConstants.ZK_SESSION_TIMEOUT;</span> |
| <span class="source-line-no">022</span><span id="line-22"></span> |
| <span class="source-line-no">023</span><span id="line-23">import java.io.Closeable;</span> |
| <span class="source-line-no">024</span><span id="line-24">import java.io.IOException;</span> |
| <span class="source-line-no">025</span><span id="line-25">import java.util.Arrays;</span> |
| <span class="source-line-no">026</span><span id="line-26">import java.util.EnumSet;</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 java.util.concurrent.CompletableFuture;</span> |
| <span class="source-line-no">029</span><span id="line-29">import java.util.concurrent.DelayQueue;</span> |
| <span class="source-line-no">030</span><span id="line-30">import java.util.concurrent.Delayed;</span> |
| <span class="source-line-no">031</span><span id="line-31">import java.util.concurrent.TimeUnit;</span> |
| <span class="source-line-no">032</span><span id="line-32">import java.util.concurrent.atomic.AtomicBoolean;</span> |
| <span class="source-line-no">033</span><span id="line-33">import org.apache.hadoop.conf.Configuration;</span> |
| <span class="source-line-no">034</span><span id="line-34">import org.apache.hadoop.hbase.DoNotRetryIOException;</span> |
| <span class="source-line-no">035</span><span id="line-35">import org.apache.hadoop.hbase.util.FutureUtils;</span> |
| <span class="source-line-no">036</span><span id="line-36">import org.apache.hadoop.hbase.util.Threads;</span> |
| <span class="source-line-no">037</span><span id="line-37">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">038</span><span id="line-38">import org.apache.zookeeper.KeeperException;</span> |
| <span class="source-line-no">039</span><span id="line-39">import org.apache.zookeeper.KeeperException.Code;</span> |
| <span class="source-line-no">040</span><span id="line-40">import org.apache.zookeeper.ZooKeeper;</span> |
| <span class="source-line-no">041</span><span id="line-41">import org.apache.zookeeper.client.ZKClientConfig;</span> |
| <span class="source-line-no">042</span><span id="line-42">import org.apache.zookeeper.data.Stat;</span> |
| <span class="source-line-no">043</span><span id="line-43">import org.slf4j.Logger;</span> |
| <span class="source-line-no">044</span><span id="line-44">import org.slf4j.LoggerFactory;</span> |
| <span class="source-line-no">045</span><span id="line-45"></span> |
| <span class="source-line-no">046</span><span id="line-46">import org.apache.hbase.thirdparty.io.netty.util.HashedWheelTimer;</span> |
| <span class="source-line-no">047</span><span id="line-47">import org.apache.hbase.thirdparty.io.netty.util.TimerTask;</span> |
| <span class="source-line-no">048</span><span id="line-48"></span> |
| <span class="source-line-no">049</span><span id="line-49">/**</span> |
| <span class="source-line-no">050</span><span id="line-50"> * A very simple read only zookeeper implementation without watcher support.</span> |
| <span class="source-line-no">051</span><span id="line-51"> */</span> |
| <span class="source-line-no">052</span><span id="line-52">@InterfaceAudience.Private</span> |
| <span class="source-line-no">053</span><span id="line-53">public final class ReadOnlyZKClient implements Closeable {</span> |
| <span class="source-line-no">054</span><span id="line-54"></span> |
| <span class="source-line-no">055</span><span id="line-55"> private static final Logger LOG = LoggerFactory.getLogger(ReadOnlyZKClient.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"> public static final String RECOVERY_RETRY = "zookeeper.recovery.retry";</span> |
| <span class="source-line-no">058</span><span id="line-58"></span> |
| <span class="source-line-no">059</span><span id="line-59"> private static final int DEFAULT_RECOVERY_RETRY = 30;</span> |
| <span class="source-line-no">060</span><span id="line-60"></span> |
| <span class="source-line-no">061</span><span id="line-61"> public static final String RECOVERY_RETRY_INTERVAL_MILLIS =</span> |
| <span class="source-line-no">062</span><span id="line-62"> "zookeeper.recovery.retry.intervalmill";</span> |
| <span class="source-line-no">063</span><span id="line-63"></span> |
| <span class="source-line-no">064</span><span id="line-64"> private static final int DEFAULT_RECOVERY_RETRY_INTERVAL_MILLIS = 1000;</span> |
| <span class="source-line-no">065</span><span id="line-65"></span> |
| <span class="source-line-no">066</span><span id="line-66"> public static final String KEEPALIVE_MILLIS = "zookeeper.keep-alive.time";</span> |
| <span class="source-line-no">067</span><span id="line-67"></span> |
| <span class="source-line-no">068</span><span id="line-68"> private static final int DEFAULT_KEEPALIVE_MILLIS = 60000;</span> |
| <span class="source-line-no">069</span><span id="line-69"></span> |
| <span class="source-line-no">070</span><span id="line-70"> private static final EnumSet<Code> FAIL_FAST_CODES = EnumSet.of(Code.NOAUTH, Code.AUTHFAILED);</span> |
| <span class="source-line-no">071</span><span id="line-71"></span> |
| <span class="source-line-no">072</span><span id="line-72"> private final String connectString;</span> |
| <span class="source-line-no">073</span><span id="line-73"></span> |
| <span class="source-line-no">074</span><span id="line-74"> private final int sessionTimeoutMs;</span> |
| <span class="source-line-no">075</span><span id="line-75"></span> |
| <span class="source-line-no">076</span><span id="line-76"> private final int maxRetries;</span> |
| <span class="source-line-no">077</span><span id="line-77"></span> |
| <span class="source-line-no">078</span><span id="line-78"> private final int retryIntervalMs;</span> |
| <span class="source-line-no">079</span><span id="line-79"></span> |
| <span class="source-line-no">080</span><span id="line-80"> private final int keepAliveTimeMs;</span> |
| <span class="source-line-no">081</span><span id="line-81"></span> |
| <span class="source-line-no">082</span><span id="line-82"> private HashedWheelTimer retryTimer;</span> |
| <span class="source-line-no">083</span><span id="line-83"></span> |
| <span class="source-line-no">084</span><span id="line-84"> private final ZKClientConfig zkClientConfig;</span> |
| <span class="source-line-no">085</span><span id="line-85"></span> |
| <span class="source-line-no">086</span><span id="line-86"> private static abstract class Task implements Delayed {</span> |
| <span class="source-line-no">087</span><span id="line-87"></span> |
| <span class="source-line-no">088</span><span id="line-88"> protected long time = System.nanoTime();</span> |
| <span class="source-line-no">089</span><span id="line-89"></span> |
| <span class="source-line-no">090</span><span id="line-90"> public boolean needZk() {</span> |
| <span class="source-line-no">091</span><span id="line-91"> return false;</span> |
| <span class="source-line-no">092</span><span id="line-92"> }</span> |
| <span class="source-line-no">093</span><span id="line-93"></span> |
| <span class="source-line-no">094</span><span id="line-94"> public void exec(ZooKeeper zk) {</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"> public void connectFailed(Exception e) {</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"> public void closed(IOException e) {</span> |
| <span class="source-line-no">101</span><span id="line-101"> }</span> |
| <span class="source-line-no">102</span><span id="line-102"></span> |
| <span class="source-line-no">103</span><span id="line-103"> @Override</span> |
| <span class="source-line-no">104</span><span id="line-104"> public int compareTo(Delayed o) {</span> |
| <span class="source-line-no">105</span><span id="line-105"> Task that = (Task) o;</span> |
| <span class="source-line-no">106</span><span id="line-106"> int c = Long.compare(time, that.time);</span> |
| <span class="source-line-no">107</span><span id="line-107"> if (c != 0) {</span> |
| <span class="source-line-no">108</span><span id="line-108"> return c;</span> |
| <span class="source-line-no">109</span><span id="line-109"> }</span> |
| <span class="source-line-no">110</span><span id="line-110"> return Integer.compare(System.identityHashCode(this), System.identityHashCode(that));</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"> @Override</span> |
| <span class="source-line-no">114</span><span id="line-114"> public long getDelay(TimeUnit unit) {</span> |
| <span class="source-line-no">115</span><span id="line-115"> return unit.convert(time - System.nanoTime(), TimeUnit.NANOSECONDS);</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"></span> |
| <span class="source-line-no">119</span><span id="line-119"> private static final Task CLOSE = new Task() {</span> |
| <span class="source-line-no">120</span><span id="line-120"> };</span> |
| <span class="source-line-no">121</span><span id="line-121"></span> |
| <span class="source-line-no">122</span><span id="line-122"> private final DelayQueue<Task> tasks = new DelayQueue<>();</span> |
| <span class="source-line-no">123</span><span id="line-123"></span> |
| <span class="source-line-no">124</span><span id="line-124"> private final AtomicBoolean closed = new AtomicBoolean(false);</span> |
| <span class="source-line-no">125</span><span id="line-125"></span> |
| <span class="source-line-no">126</span><span id="line-126"> ZooKeeper zookeeper;</span> |
| <span class="source-line-no">127</span><span id="line-127"></span> |
| <span class="source-line-no">128</span><span id="line-128"> private int pendingRequests = 0;</span> |
| <span class="source-line-no">129</span><span id="line-129"></span> |
| <span class="source-line-no">130</span><span id="line-130"> private String getId() {</span> |
| <span class="source-line-no">131</span><span id="line-131"> return String.format("0x%08x", System.identityHashCode(this));</span> |
| <span class="source-line-no">132</span><span id="line-132"> }</span> |
| <span class="source-line-no">133</span><span id="line-133"></span> |
| <span class="source-line-no">134</span><span id="line-134"> public ReadOnlyZKClient(Configuration conf, HashedWheelTimer retryTimer) {</span> |
| <span class="source-line-no">135</span><span id="line-135"> // We might use a different ZK for client access</span> |
| <span class="source-line-no">136</span><span id="line-136"> String clientZkQuorumServers = ZKConfig.getClientZKQuorumServersString(conf);</span> |
| <span class="source-line-no">137</span><span id="line-137"> if (clientZkQuorumServers != null) {</span> |
| <span class="source-line-no">138</span><span id="line-138"> this.connectString = clientZkQuorumServers;</span> |
| <span class="source-line-no">139</span><span id="line-139"> } else {</span> |
| <span class="source-line-no">140</span><span id="line-140"> this.connectString = ZKConfig.getZKQuorumServersString(conf);</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.sessionTimeoutMs = conf.getInt(ZK_SESSION_TIMEOUT, DEFAULT_ZK_SESSION_TIMEOUT);</span> |
| <span class="source-line-no">143</span><span id="line-143"> this.maxRetries = conf.getInt(RECOVERY_RETRY, DEFAULT_RECOVERY_RETRY);</span> |
| <span class="source-line-no">144</span><span id="line-144"> this.retryIntervalMs =</span> |
| <span class="source-line-no">145</span><span id="line-145"> conf.getInt(RECOVERY_RETRY_INTERVAL_MILLIS, DEFAULT_RECOVERY_RETRY_INTERVAL_MILLIS);</span> |
| <span class="source-line-no">146</span><span id="line-146"> this.keepAliveTimeMs = conf.getInt(KEEPALIVE_MILLIS, DEFAULT_KEEPALIVE_MILLIS);</span> |
| <span class="source-line-no">147</span><span id="line-147"> this.zkClientConfig = ZKConfig.getZKClientConfig(conf);</span> |
| <span class="source-line-no">148</span><span id="line-148"> this.retryTimer = retryTimer;</span> |
| <span class="source-line-no">149</span><span id="line-149"> LOG.debug(</span> |
| <span class="source-line-no">150</span><span id="line-150"> "Connect {} to {} with session timeout={}ms, retries={}, "</span> |
| <span class="source-line-no">151</span><span id="line-151"> + "retry interval={}ms, keepAlive={}ms, zk client config={}",</span> |
| <span class="source-line-no">152</span><span id="line-152"> getId(), connectString, sessionTimeoutMs, maxRetries, retryIntervalMs, keepAliveTimeMs,</span> |
| <span class="source-line-no">153</span><span id="line-153"> zkClientConfig);</span> |
| <span class="source-line-no">154</span><span id="line-154"> Threads.setDaemonThreadRunning(new Thread(this::run),</span> |
| <span class="source-line-no">155</span><span id="line-155"> "ReadOnlyZKClient-" + connectString + "@" + getId());</span> |
| <span class="source-line-no">156</span><span id="line-156"> }</span> |
| <span class="source-line-no">157</span><span id="line-157"></span> |
| <span class="source-line-no">158</span><span id="line-158"> private abstract class ZKTask<T> extends Task {</span> |
| <span class="source-line-no">159</span><span id="line-159"></span> |
| <span class="source-line-no">160</span><span id="line-160"> protected final String path;</span> |
| <span class="source-line-no">161</span><span id="line-161"></span> |
| <span class="source-line-no">162</span><span id="line-162"> private final CompletableFuture<T> future;</span> |
| <span class="source-line-no">163</span><span id="line-163"></span> |
| <span class="source-line-no">164</span><span id="line-164"> private final String operationType;</span> |
| <span class="source-line-no">165</span><span id="line-165"></span> |
| <span class="source-line-no">166</span><span id="line-166"> private int retries;</span> |
| <span class="source-line-no">167</span><span id="line-167"></span> |
| <span class="source-line-no">168</span><span id="line-168"> protected ZKTask(String path, CompletableFuture<T> future, String operationType) {</span> |
| <span class="source-line-no">169</span><span id="line-169"> this.path = path;</span> |
| <span class="source-line-no">170</span><span id="line-170"> this.future = future;</span> |
| <span class="source-line-no">171</span><span id="line-171"> this.operationType = operationType;</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"> protected final void onComplete(ZooKeeper zk, int rc, T ret, boolean errorIfNoNode) {</span> |
| <span class="source-line-no">175</span><span id="line-175"> tasks.add(new Task() {</span> |
| <span class="source-line-no">176</span><span id="line-176"></span> |
| <span class="source-line-no">177</span><span id="line-177"> @Override</span> |
| <span class="source-line-no">178</span><span id="line-178"> public void exec(ZooKeeper alwaysNull) {</span> |
| <span class="source-line-no">179</span><span id="line-179"> pendingRequests--;</span> |
| <span class="source-line-no">180</span><span id="line-180"> Code code = Code.get(rc);</span> |
| <span class="source-line-no">181</span><span id="line-181"> if (code == Code.OK) {</span> |
| <span class="source-line-no">182</span><span id="line-182"> future.complete(ret);</span> |
| <span class="source-line-no">183</span><span id="line-183"> } else if (code == Code.NONODE) {</span> |
| <span class="source-line-no">184</span><span id="line-184"> if (errorIfNoNode) {</span> |
| <span class="source-line-no">185</span><span id="line-185"> future.completeExceptionally(KeeperException.create(code, path));</span> |
| <span class="source-line-no">186</span><span id="line-186"> } else {</span> |
| <span class="source-line-no">187</span><span id="line-187"> future.complete(ret);</span> |
| <span class="source-line-no">188</span><span id="line-188"> }</span> |
| <span class="source-line-no">189</span><span id="line-189"> } else if (FAIL_FAST_CODES.contains(code)) {</span> |
| <span class="source-line-no">190</span><span id="line-190"> future.completeExceptionally(KeeperException.create(code, path));</span> |
| <span class="source-line-no">191</span><span id="line-191"> } else {</span> |
| <span class="source-line-no">192</span><span id="line-192"> if (code == Code.SESSIONEXPIRED) {</span> |
| <span class="source-line-no">193</span><span id="line-193"> LOG.warn("{} to {} session expired, close and reconnect", getId(), connectString);</span> |
| <span class="source-line-no">194</span><span id="line-194"> try {</span> |
| <span class="source-line-no">195</span><span id="line-195"> zk.close();</span> |
| <span class="source-line-no">196</span><span id="line-196"> } catch (InterruptedException e) {</span> |
| <span class="source-line-no">197</span><span id="line-197"> // Restore interrupt status</span> |
| <span class="source-line-no">198</span><span id="line-198"> Thread.currentThread().interrupt();</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"> if (ZKTask.this.delay(retryIntervalMs, maxRetries)) {</span> |
| <span class="source-line-no">202</span><span id="line-202"> LOG.warn("{} to {} failed for {} of {}, code = {}, retries = {}", getId(),</span> |
| <span class="source-line-no">203</span><span id="line-203"> connectString, operationType, path, code, ZKTask.this.retries);</span> |
| <span class="source-line-no">204</span><span id="line-204"> tasks.add(ZKTask.this);</span> |
| <span class="source-line-no">205</span><span id="line-205"> } else {</span> |
| <span class="source-line-no">206</span><span id="line-206"> LOG.warn("{} to {} failed for {} of {}, code = {}, retries = {}, give up", getId(),</span> |
| <span class="source-line-no">207</span><span id="line-207"> connectString, operationType, path, code, ZKTask.this.retries);</span> |
| <span class="source-line-no">208</span><span id="line-208"> future.completeExceptionally(KeeperException.create(code, path));</span> |
| <span class="source-line-no">209</span><span id="line-209"> }</span> |
| <span class="source-line-no">210</span><span id="line-210"> }</span> |
| <span class="source-line-no">211</span><span id="line-211"> }</span> |
| <span class="source-line-no">212</span><span id="line-212"></span> |
| <span class="source-line-no">213</span><span id="line-213"> @Override</span> |
| <span class="source-line-no">214</span><span id="line-214"> public void closed(IOException e) {</span> |
| <span class="source-line-no">215</span><span id="line-215"> // It may happen that a request is succeeded and the onComplete has been called and pushed</span> |
| <span class="source-line-no">216</span><span id="line-216"> // us into the task queue, but before we get called a close is called and here we will</span> |
| <span class="source-line-no">217</span><span id="line-217"> // fail the request, although it is succeeded actually.</span> |
| <span class="source-line-no">218</span><span id="line-218"> // This is not a perfect solution but anyway, it is better than hang the requests for</span> |
| <span class="source-line-no">219</span><span id="line-219"> // ever, and also acceptable as if you close the zk client before actually getting the</span> |
| <span class="source-line-no">220</span><span id="line-220"> // response then a failure is always possible.</span> |
| <span class="source-line-no">221</span><span id="line-221"> future.completeExceptionally(e);</span> |
| <span class="source-line-no">222</span><span id="line-222"> }</span> |
| <span class="source-line-no">223</span><span id="line-223"> });</span> |
| <span class="source-line-no">224</span><span id="line-224"> }</span> |
| <span class="source-line-no">225</span><span id="line-225"></span> |
| <span class="source-line-no">226</span><span id="line-226"> @Override</span> |
| <span class="source-line-no">227</span><span id="line-227"> public boolean needZk() {</span> |
| <span class="source-line-no">228</span><span id="line-228"> return true;</span> |
| <span class="source-line-no">229</span><span id="line-229"> }</span> |
| <span class="source-line-no">230</span><span id="line-230"></span> |
| <span class="source-line-no">231</span><span id="line-231"> protected abstract void doExec(ZooKeeper zk);</span> |
| <span class="source-line-no">232</span><span id="line-232"></span> |
| <span class="source-line-no">233</span><span id="line-233"> @Override</span> |
| <span class="source-line-no">234</span><span id="line-234"> public final void exec(ZooKeeper zk) {</span> |
| <span class="source-line-no">235</span><span id="line-235"> pendingRequests++;</span> |
| <span class="source-line-no">236</span><span id="line-236"> doExec(zk);</span> |
| <span class="source-line-no">237</span><span id="line-237"> }</span> |
| <span class="source-line-no">238</span><span id="line-238"></span> |
| <span class="source-line-no">239</span><span id="line-239"> public boolean delay(long intervalMs, int maxRetries) {</span> |
| <span class="source-line-no">240</span><span id="line-240"> if (retries >= maxRetries) {</span> |
| <span class="source-line-no">241</span><span id="line-241"> return false;</span> |
| <span class="source-line-no">242</span><span id="line-242"> }</span> |
| <span class="source-line-no">243</span><span id="line-243"> retries++;</span> |
| <span class="source-line-no">244</span><span id="line-244"> time = System.nanoTime() + TimeUnit.MILLISECONDS.toNanos(intervalMs);</span> |
| <span class="source-line-no">245</span><span id="line-245"> return true;</span> |
| <span class="source-line-no">246</span><span id="line-246"> }</span> |
| <span class="source-line-no">247</span><span id="line-247"></span> |
| <span class="source-line-no">248</span><span id="line-248"> @Override</span> |
| <span class="source-line-no">249</span><span id="line-249"> public void connectFailed(Exception e) {</span> |
| <span class="source-line-no">250</span><span id="line-250"> if (delay(retryIntervalMs, maxRetries)) {</span> |
| <span class="source-line-no">251</span><span id="line-251"> LOG.warn("{} to {} failed to connect to zk fo {} of {}, retries = {}", getId(),</span> |
| <span class="source-line-no">252</span><span id="line-252"> connectString, operationType, path, retries, e);</span> |
| <span class="source-line-no">253</span><span id="line-253"> tasks.add(this);</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"> LOG.warn("{} to {} failed to connect to zk fo {} of {}, retries = {}, give up", getId(),</span> |
| <span class="source-line-no">256</span><span id="line-256"> connectString, operationType, path, retries, e);</span> |
| <span class="source-line-no">257</span><span id="line-257"> future.completeExceptionally(e);</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"> @Override</span> |
| <span class="source-line-no">262</span><span id="line-262"> public void closed(IOException e) {</span> |
| <span class="source-line-no">263</span><span id="line-263"> future.completeExceptionally(e);</span> |
| <span class="source-line-no">264</span><span id="line-264"> }</span> |
| <span class="source-line-no">265</span><span id="line-265"> }</span> |
| <span class="source-line-no">266</span><span id="line-266"></span> |
| <span class="source-line-no">267</span><span id="line-267"> private static TimerTask getTimerTask(final long timeoutMs, final CompletableFuture<?> future,</span> |
| <span class="source-line-no">268</span><span id="line-268"> final String api) {</span> |
| <span class="source-line-no">269</span><span id="line-269"> return timeout -> {</span> |
| <span class="source-line-no">270</span><span id="line-270"> if (!future.isDone()) {</span> |
| <span class="source-line-no">271</span><span id="line-271"> future.completeExceptionally(new DoNotRetryIOException(</span> |
| <span class="source-line-no">272</span><span id="line-272"> "Zookeeper " + api + " could not be completed in " + timeoutMs + " ms"));</span> |
| <span class="source-line-no">273</span><span id="line-273"> }</span> |
| <span class="source-line-no">274</span><span id="line-274"> };</span> |
| <span class="source-line-no">275</span><span id="line-275"> }</span> |
| <span class="source-line-no">276</span><span id="line-276"></span> |
| <span class="source-line-no">277</span><span id="line-277"> public CompletableFuture<byte[]> get(final String path, final long timeoutMs) {</span> |
| <span class="source-line-no">278</span><span id="line-278"> CompletableFuture<byte[]> future = get(path);</span> |
| <span class="source-line-no">279</span><span id="line-279"> TimerTask timerTask = getTimerTask(timeoutMs, future, "GET");</span> |
| <span class="source-line-no">280</span><span id="line-280"> retryTimer.newTimeout(timerTask, timeoutMs + 1, TimeUnit.MILLISECONDS);</span> |
| <span class="source-line-no">281</span><span id="line-281"> return future;</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"> public CompletableFuture<byte[]> get(String path) {</span> |
| <span class="source-line-no">285</span><span id="line-285"> if (closed.get()) {</span> |
| <span class="source-line-no">286</span><span id="line-286"> return FutureUtils.failedFuture(new DoNotRetryIOException("Client already closed"));</span> |
| <span class="source-line-no">287</span><span id="line-287"> }</span> |
| <span class="source-line-no">288</span><span id="line-288"> CompletableFuture<byte[]> future = new CompletableFuture<>();</span> |
| <span class="source-line-no">289</span><span id="line-289"> tasks.add(new ZKTask<byte[]>(path, future, "get") {</span> |
| <span class="source-line-no">290</span><span id="line-290"></span> |
| <span class="source-line-no">291</span><span id="line-291"> @Override</span> |
| <span class="source-line-no">292</span><span id="line-292"> protected void doExec(ZooKeeper zk) {</span> |
| <span class="source-line-no">293</span><span id="line-293"> zk.getData(path, false, (rc, path, ctx, data, stat) -> onComplete(zk, rc, data, true),</span> |
| <span class="source-line-no">294</span><span id="line-294"> null);</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"> return future;</span> |
| <span class="source-line-no">298</span><span id="line-298"> }</span> |
| <span class="source-line-no">299</span><span id="line-299"></span> |
| <span class="source-line-no">300</span><span id="line-300"> public CompletableFuture<Stat> exists(String path, long timeoutMs) {</span> |
| <span class="source-line-no">301</span><span id="line-301"> CompletableFuture<Stat> future = exists(path);</span> |
| <span class="source-line-no">302</span><span id="line-302"> TimerTask timerTask = getTimerTask(timeoutMs, future, "EXISTS");</span> |
| <span class="source-line-no">303</span><span id="line-303"> retryTimer.newTimeout(timerTask, timeoutMs + 1, TimeUnit.MILLISECONDS);</span> |
| <span class="source-line-no">304</span><span id="line-304"> return future;</span> |
| <span class="source-line-no">305</span><span id="line-305"> }</span> |
| <span class="source-line-no">306</span><span id="line-306"></span> |
| <span class="source-line-no">307</span><span id="line-307"> public CompletableFuture<Stat> exists(String path) {</span> |
| <span class="source-line-no">308</span><span id="line-308"> if (closed.get()) {</span> |
| <span class="source-line-no">309</span><span id="line-309"> return FutureUtils.failedFuture(new DoNotRetryIOException("Client already closed"));</span> |
| <span class="source-line-no">310</span><span id="line-310"> }</span> |
| <span class="source-line-no">311</span><span id="line-311"> CompletableFuture<Stat> future = new CompletableFuture<>();</span> |
| <span class="source-line-no">312</span><span id="line-312"> tasks.add(new ZKTask<Stat>(path, future, "exists") {</span> |
| <span class="source-line-no">313</span><span id="line-313"></span> |
| <span class="source-line-no">314</span><span id="line-314"> @Override</span> |
| <span class="source-line-no">315</span><span id="line-315"> protected void doExec(ZooKeeper zk) {</span> |
| <span class="source-line-no">316</span><span id="line-316"> zk.exists(path, false, (rc, path, ctx, stat) -> onComplete(zk, rc, stat, false), null);</span> |
| <span class="source-line-no">317</span><span id="line-317"> }</span> |
| <span class="source-line-no">318</span><span id="line-318"> });</span> |
| <span class="source-line-no">319</span><span id="line-319"> return future;</span> |
| <span class="source-line-no">320</span><span id="line-320"> }</span> |
| <span class="source-line-no">321</span><span id="line-321"></span> |
| <span class="source-line-no">322</span><span id="line-322"> public CompletableFuture<List<String>> list(String path, long timeoutMs) {</span> |
| <span class="source-line-no">323</span><span id="line-323"> CompletableFuture<List<String>> future = list(path);</span> |
| <span class="source-line-no">324</span><span id="line-324"> TimerTask timerTask = getTimerTask(timeoutMs, future, "LIST");</span> |
| <span class="source-line-no">325</span><span id="line-325"> retryTimer.newTimeout(timerTask, timeoutMs + 1, TimeUnit.MILLISECONDS);</span> |
| <span class="source-line-no">326</span><span id="line-326"> return future;</span> |
| <span class="source-line-no">327</span><span id="line-327"> }</span> |
| <span class="source-line-no">328</span><span id="line-328"></span> |
| <span class="source-line-no">329</span><span id="line-329"> public CompletableFuture<List<String>> list(String path) {</span> |
| <span class="source-line-no">330</span><span id="line-330"> if (closed.get()) {</span> |
| <span class="source-line-no">331</span><span id="line-331"> return FutureUtils.failedFuture(new DoNotRetryIOException("Client already closed"));</span> |
| <span class="source-line-no">332</span><span id="line-332"> }</span> |
| <span class="source-line-no">333</span><span id="line-333"> CompletableFuture<List<String>> future = new CompletableFuture<>();</span> |
| <span class="source-line-no">334</span><span id="line-334"> tasks.add(new ZKTask<List<String>>(path, future, "list") {</span> |
| <span class="source-line-no">335</span><span id="line-335"></span> |
| <span class="source-line-no">336</span><span id="line-336"> @Override</span> |
| <span class="source-line-no">337</span><span id="line-337"> protected void doExec(ZooKeeper zk) {</span> |
| <span class="source-line-no">338</span><span id="line-338"> zk.getChildren(path, false, (rc, path, ctx, children) -> onComplete(zk, rc, children, true),</span> |
| <span class="source-line-no">339</span><span id="line-339"> null);</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"> return future;</span> |
| <span class="source-line-no">343</span><span id="line-343"> }</span> |
| <span class="source-line-no">344</span><span id="line-344"></span> |
| <span class="source-line-no">345</span><span id="line-345"> private void closeZk() {</span> |
| <span class="source-line-no">346</span><span id="line-346"> if (zookeeper != null) {</span> |
| <span class="source-line-no">347</span><span id="line-347"> try {</span> |
| <span class="source-line-no">348</span><span id="line-348"> zookeeper.close();</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"> // Restore interrupt status</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"> zookeeper = null;</span> |
| <span class="source-line-no">354</span><span id="line-354"> }</span> |
| <span class="source-line-no">355</span><span id="line-355"> }</span> |
| <span class="source-line-no">356</span><span id="line-356"></span> |
| <span class="source-line-no">357</span><span id="line-357"> private ZooKeeper getZk() throws IOException {</span> |
| <span class="source-line-no">358</span><span id="line-358"> // may be closed when session expired</span> |
| <span class="source-line-no">359</span><span id="line-359"> if (zookeeper == null || !zookeeper.getState().isAlive()) {</span> |
| <span class="source-line-no">360</span><span id="line-360"> zookeeper = new ZooKeeper(connectString, sessionTimeoutMs, e -> {</span> |
| <span class="source-line-no">361</span><span id="line-361"> }, zkClientConfig);</span> |
| <span class="source-line-no">362</span><span id="line-362"> }</span> |
| <span class="source-line-no">363</span><span id="line-363"> return zookeeper;</span> |
| <span class="source-line-no">364</span><span id="line-364"> }</span> |
| <span class="source-line-no">365</span><span id="line-365"></span> |
| <span class="source-line-no">366</span><span id="line-366"> private void run() {</span> |
| <span class="source-line-no">367</span><span id="line-367"> for (;;) {</span> |
| <span class="source-line-no">368</span><span id="line-368"> Task task;</span> |
| <span class="source-line-no">369</span><span id="line-369"> try {</span> |
| <span class="source-line-no">370</span><span id="line-370"> task = tasks.poll(keepAliveTimeMs, TimeUnit.MILLISECONDS);</span> |
| <span class="source-line-no">371</span><span id="line-371"> } catch (InterruptedException e) {</span> |
| <span class="source-line-no">372</span><span id="line-372"> continue;</span> |
| <span class="source-line-no">373</span><span id="line-373"> }</span> |
| <span class="source-line-no">374</span><span id="line-374"> if (task == CLOSE) {</span> |
| <span class="source-line-no">375</span><span id="line-375"> break;</span> |
| <span class="source-line-no">376</span><span id="line-376"> }</span> |
| <span class="source-line-no">377</span><span id="line-377"> if (task == null) {</span> |
| <span class="source-line-no">378</span><span id="line-378"> if (pendingRequests == 0) {</span> |
| <span class="source-line-no">379</span><span id="line-379"> LOG.trace("{} to {} inactive for {}ms; closing (Will reconnect when new requests)",</span> |
| <span class="source-line-no">380</span><span id="line-380"> getId(), connectString, keepAliveTimeMs);</span> |
| <span class="source-line-no">381</span><span id="line-381"> closeZk();</span> |
| <span class="source-line-no">382</span><span id="line-382"> }</span> |
| <span class="source-line-no">383</span><span id="line-383"> continue;</span> |
| <span class="source-line-no">384</span><span id="line-384"> }</span> |
| <span class="source-line-no">385</span><span id="line-385"> if (!task.needZk()) {</span> |
| <span class="source-line-no">386</span><span id="line-386"> task.exec(null);</span> |
| <span class="source-line-no">387</span><span id="line-387"> } else {</span> |
| <span class="source-line-no">388</span><span id="line-388"> ZooKeeper zk;</span> |
| <span class="source-line-no">389</span><span id="line-389"> try {</span> |
| <span class="source-line-no">390</span><span id="line-390"> zk = getZk();</span> |
| <span class="source-line-no">391</span><span id="line-391"> } catch (Exception e) {</span> |
| <span class="source-line-no">392</span><span id="line-392"> task.connectFailed(e);</span> |
| <span class="source-line-no">393</span><span id="line-393"> continue;</span> |
| <span class="source-line-no">394</span><span id="line-394"> }</span> |
| <span class="source-line-no">395</span><span id="line-395"> task.exec(zk);</span> |
| <span class="source-line-no">396</span><span id="line-396"> }</span> |
| <span class="source-line-no">397</span><span id="line-397"> }</span> |
| <span class="source-line-no">398</span><span id="line-398"> closeZk();</span> |
| <span class="source-line-no">399</span><span id="line-399"> DoNotRetryIOException error = new DoNotRetryIOException("Client already closed");</span> |
| <span class="source-line-no">400</span><span id="line-400"> Arrays.stream(tasks.toArray(new Task[0])).forEach(t -> t.closed(error));</span> |
| <span class="source-line-no">401</span><span id="line-401"> tasks.clear();</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"> @Override</span> |
| <span class="source-line-no">405</span><span id="line-405"> public void close() {</span> |
| <span class="source-line-no">406</span><span id="line-406"> if (closed.compareAndSet(false, true)) {</span> |
| <span class="source-line-no">407</span><span id="line-407"> LOG.debug("Close zookeeper connection {} to {}", getId(), connectString);</span> |
| <span class="source-line-no">408</span><span id="line-408"> tasks.add(CLOSE);</span> |
| <span class="source-line-no">409</span><span id="line-409"> }</span> |
| <span class="source-line-no">410</span><span id="line-410"> }</span> |
| <span class="source-line-no">411</span><span id="line-411"></span> |
| <span class="source-line-no">412</span><span id="line-412"> public String getConnectString() {</span> |
| <span class="source-line-no">413</span><span id="line-413"> return connectString;</span> |
| <span class="source-line-no">414</span><span id="line-414"> }</span> |
| <span class="source-line-no">415</span><span id="line-415">}</span> |
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| </main> |
| </body> |
| </html> |
