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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.regionserver;</span> |
| <span class="source-line-no">019</span><span id="line-19"></span> |
| <span class="source-line-no">020</span><span id="line-20">import java.time.Instant;</span> |
| <span class="source-line-no">021</span><span id="line-21">import java.time.ZoneId;</span> |
| <span class="source-line-no">022</span><span id="line-22">import java.time.format.DateTimeFormatter;</span> |
| <span class="source-line-no">023</span><span id="line-23">import java.util.Map;</span> |
| <span class="source-line-no">024</span><span id="line-24">import java.util.concurrent.ConcurrentHashMap;</span> |
| <span class="source-line-no">025</span><span id="line-25">import org.apache.hadoop.conf.Configuration;</span> |
| <span class="source-line-no">026</span><span id="line-26">import org.apache.hadoop.hbase.HConstants;</span> |
| <span class="source-line-no">027</span><span id="line-27">import org.apache.hadoop.hbase.ScheduledChore;</span> |
| <span class="source-line-no">028</span><span id="line-28">import org.apache.hadoop.hbase.Stoppable;</span> |
| <span class="source-line-no">029</span><span id="line-29">import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;</span> |
| <span class="source-line-no">030</span><span id="line-30">import org.apache.hadoop.hbase.util.NonceKey;</span> |
| <span class="source-line-no">031</span><span id="line-31">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">032</span><span id="line-32">import org.slf4j.Logger;</span> |
| <span class="source-line-no">033</span><span id="line-33">import org.slf4j.LoggerFactory;</span> |
| <span class="source-line-no">034</span><span id="line-34"></span> |
| <span class="source-line-no">035</span><span id="line-35">/**</span> |
| <span class="source-line-no">036</span><span id="line-36"> * Implementation of nonce manager that stores nonces in a hash map and cleans them up after some</span> |
| <span class="source-line-no">037</span><span id="line-37"> * time; if nonce group/client ID is supplied, nonces are stored by client ID.</span> |
| <span class="source-line-no">038</span><span id="line-38"> */</span> |
| <span class="source-line-no">039</span><span id="line-39">@InterfaceAudience.Private</span> |
| <span class="source-line-no">040</span><span id="line-40">public class ServerNonceManager {</span> |
| <span class="source-line-no">041</span><span id="line-41"> public static final String HASH_NONCE_GRACE_PERIOD_KEY = "hbase.server.hashNonce.gracePeriod";</span> |
| <span class="source-line-no">042</span><span id="line-42"> private static final Logger LOG = LoggerFactory.getLogger(ServerNonceManager.class);</span> |
| <span class="source-line-no">043</span><span id="line-43"></span> |
| <span class="source-line-no">044</span><span id="line-44"> /**</span> |
| <span class="source-line-no">045</span><span id="line-45"> * The time to wait in an extremely unlikely case of a conflict with a running op. Only here so</span> |
| <span class="source-line-no">046</span><span id="line-46"> * that tests could override it and not wait.</span> |
| <span class="source-line-no">047</span><span id="line-47"> */</span> |
| <span class="source-line-no">048</span><span id="line-48"> private int conflictWaitIterationMs = 30000;</span> |
| <span class="source-line-no">049</span><span id="line-49"></span> |
| <span class="source-line-no">050</span><span id="line-50"> private static final DateTimeFormatter TS_FORMAT =</span> |
| <span class="source-line-no">051</span><span id="line-51"> DateTimeFormatter.ofPattern("HH:mm:ss.SSS").withZone(ZoneId.systemDefault());</span> |
| <span class="source-line-no">052</span><span id="line-52"></span> |
| <span class="source-line-no">053</span><span id="line-53"> // This object is used to synchronize on in case of collisions, and for cleanup.</span> |
| <span class="source-line-no">054</span><span id="line-54"> private static class OperationContext {</span> |
| <span class="source-line-no">055</span><span id="line-55"> static final int DONT_PROCEED = 0;</span> |
| <span class="source-line-no">056</span><span id="line-56"> static final int PROCEED = 1;</span> |
| <span class="source-line-no">057</span><span id="line-57"> static final int WAIT = 2;</span> |
| <span class="source-line-no">058</span><span id="line-58"></span> |
| <span class="source-line-no">059</span><span id="line-59"> // 0..1 - state, 2..2 - whether anyone is waiting, 3.. - ts of last activity</span> |
| <span class="source-line-no">060</span><span id="line-60"> private long data = 0;</span> |
| <span class="source-line-no">061</span><span id="line-61"> private static final long STATE_BITS = 3;</span> |
| <span class="source-line-no">062</span><span id="line-62"> private static final long WAITING_BIT = 4;</span> |
| <span class="source-line-no">063</span><span id="line-63"> private static final long ALL_FLAG_BITS = WAITING_BIT | STATE_BITS;</span> |
| <span class="source-line-no">064</span><span id="line-64"></span> |
| <span class="source-line-no">065</span><span id="line-65"> private volatile long mvcc;</span> |
| <span class="source-line-no">066</span><span id="line-66"></span> |
| <span class="source-line-no">067</span><span id="line-67"> @Override</span> |
| <span class="source-line-no">068</span><span id="line-68"> public String toString() {</span> |
| <span class="source-line-no">069</span><span id="line-69"> return "[state " + getState() + ", hasWait " + hasWait() + ", activity "</span> |
| <span class="source-line-no">070</span><span id="line-70"> + TS_FORMAT.format(Instant.ofEpochMilli(getActivityTime())) + "]";</span> |
| <span class="source-line-no">071</span><span id="line-71"> }</span> |
| <span class="source-line-no">072</span><span id="line-72"></span> |
| <span class="source-line-no">073</span><span id="line-73"> public OperationContext() {</span> |
| <span class="source-line-no">074</span><span id="line-74"> setState(WAIT);</span> |
| <span class="source-line-no">075</span><span id="line-75"> reportActivity();</span> |
| <span class="source-line-no">076</span><span id="line-76"> }</span> |
| <span class="source-line-no">077</span><span id="line-77"></span> |
| <span class="source-line-no">078</span><span id="line-78"> public void setState(int state) {</span> |
| <span class="source-line-no">079</span><span id="line-79"> this.data = (this.data & ~STATE_BITS) | state;</span> |
| <span class="source-line-no">080</span><span id="line-80"> }</span> |
| <span class="source-line-no">081</span><span id="line-81"></span> |
| <span class="source-line-no">082</span><span id="line-82"> public int getState() {</span> |
| <span class="source-line-no">083</span><span id="line-83"> return (int) (this.data & STATE_BITS);</span> |
| <span class="source-line-no">084</span><span id="line-84"> }</span> |
| <span class="source-line-no">085</span><span id="line-85"></span> |
| <span class="source-line-no">086</span><span id="line-86"> public void setHasWait() {</span> |
| <span class="source-line-no">087</span><span id="line-87"> this.data = this.data | WAITING_BIT;</span> |
| <span class="source-line-no">088</span><span id="line-88"> }</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 hasWait() {</span> |
| <span class="source-line-no">091</span><span id="line-91"> return (this.data & WAITING_BIT) == WAITING_BIT;</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 reportActivity() {</span> |
| <span class="source-line-no">095</span><span id="line-95"> long now = EnvironmentEdgeManager.currentTime();</span> |
| <span class="source-line-no">096</span><span id="line-96"> this.data = (this.data & ALL_FLAG_BITS) | (now << 3);</span> |
| <span class="source-line-no">097</span><span id="line-97"> }</span> |
| <span class="source-line-no">098</span><span id="line-98"></span> |
| <span class="source-line-no">099</span><span id="line-99"> public boolean isExpired(long minRelevantTime) {</span> |
| <span class="source-line-no">100</span><span id="line-100"> return getActivityTime() < (minRelevantTime & (~0L >>> 3));</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"> public void setMvcc(long mvcc) {</span> |
| <span class="source-line-no">104</span><span id="line-104"> this.mvcc = mvcc;</span> |
| <span class="source-line-no">105</span><span id="line-105"> }</span> |
| <span class="source-line-no">106</span><span id="line-106"></span> |
| <span class="source-line-no">107</span><span id="line-107"> public long getMvcc() {</span> |
| <span class="source-line-no">108</span><span id="line-108"> return this.mvcc;</span> |
| <span class="source-line-no">109</span><span id="line-109"> }</span> |
| <span class="source-line-no">110</span><span id="line-110"></span> |
| <span class="source-line-no">111</span><span id="line-111"> private long getActivityTime() {</span> |
| <span class="source-line-no">112</span><span id="line-112"> return this.data >>> 3;</span> |
| <span class="source-line-no">113</span><span id="line-113"> }</span> |
| <span class="source-line-no">114</span><span id="line-114"> }</span> |
| <span class="source-line-no">115</span><span id="line-115"></span> |
| <span class="source-line-no">116</span><span id="line-116"> /**</span> |
| <span class="source-line-no">117</span><span id="line-117"> * Nonces. Approximate overhead per nonce: 64 bytes from hashmap, 32 from two objects (k/v), NK:</span> |
| <span class="source-line-no">118</span><span id="line-118"> * 16 bytes (2 longs), OC: 8 bytes (1 long) - so, 120 bytes. With 30min expiration time, 5k</span> |
| <span class="source-line-no">119</span><span id="line-119"> * increments/appends per sec., we'd use approximately 1Gb, which is a realistic worst case. If</span> |
| <span class="source-line-no">120</span><span id="line-120"> * it's much worse, we could use some sort of memory limit and cleanup.</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 ConcurrentHashMap<NonceKey, OperationContext> nonces = new ConcurrentHashMap<>();</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 int deleteNonceGracePeriod;</span> |
| <span class="source-line-no">125</span><span id="line-125"></span> |
| <span class="source-line-no">126</span><span id="line-126"> public ServerNonceManager(Configuration conf) {</span> |
| <span class="source-line-no">127</span><span id="line-127"> // Default - 30 minutes.</span> |
| <span class="source-line-no">128</span><span id="line-128"> deleteNonceGracePeriod = conf.getInt(HASH_NONCE_GRACE_PERIOD_KEY, 30 * 60 * 1000);</span> |
| <span class="source-line-no">129</span><span id="line-129"> if (deleteNonceGracePeriod < 60 * 1000) {</span> |
| <span class="source-line-no">130</span><span id="line-130"> LOG.warn("Nonce grace period " + deleteNonceGracePeriod</span> |
| <span class="source-line-no">131</span><span id="line-131"> + " is less than a minute; might be too small to be useful");</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"></span> |
| <span class="source-line-no">135</span><span id="line-135"> public void setConflictWaitIterationMs(int conflictWaitIterationMs) {</span> |
| <span class="source-line-no">136</span><span id="line-136"> this.conflictWaitIterationMs = conflictWaitIterationMs;</span> |
| <span class="source-line-no">137</span><span id="line-137"> }</span> |
| <span class="source-line-no">138</span><span id="line-138"></span> |
| <span class="source-line-no">139</span><span id="line-139"> /**</span> |
| <span class="source-line-no">140</span><span id="line-140"> * Starts the operation if operation with such nonce has not already succeeded. If the operation</span> |
| <span class="source-line-no">141</span><span id="line-141"> * is in progress, waits for it to end and checks whether it has succeeded.</span> |
| <span class="source-line-no">142</span><span id="line-142"> * @param group Nonce group.</span> |
| <span class="source-line-no">143</span><span id="line-143"> * @param nonce Nonce.</span> |
| <span class="source-line-no">144</span><span id="line-144"> * @param stoppable Stoppable that terminates waiting (if any) when the server is stopped.</span> |
| <span class="source-line-no">145</span><span id="line-145"> * @return true if the operation has not already succeeded and can proceed; false otherwise.</span> |
| <span class="source-line-no">146</span><span id="line-146"> */</span> |
| <span class="source-line-no">147</span><span id="line-147"> public boolean startOperation(long group, long nonce, Stoppable stoppable)</span> |
| <span class="source-line-no">148</span><span id="line-148"> throws InterruptedException {</span> |
| <span class="source-line-no">149</span><span id="line-149"> if (nonce == HConstants.NO_NONCE) return true;</span> |
| <span class="source-line-no">150</span><span id="line-150"> NonceKey nk = new NonceKey(group, nonce);</span> |
| <span class="source-line-no">151</span><span id="line-151"> OperationContext ctx = new OperationContext();</span> |
| <span class="source-line-no">152</span><span id="line-152"> while (true) {</span> |
| <span class="source-line-no">153</span><span id="line-153"> OperationContext oldResult = nonces.putIfAbsent(nk, ctx);</span> |
| <span class="source-line-no">154</span><span id="line-154"> if (oldResult == null) return true;</span> |
| <span class="source-line-no">155</span><span id="line-155"></span> |
| <span class="source-line-no">156</span><span id="line-156"> // Collision with some operation - should be extremely rare.</span> |
| <span class="source-line-no">157</span><span id="line-157"> synchronized (oldResult) {</span> |
| <span class="source-line-no">158</span><span id="line-158"> int oldState = oldResult.getState();</span> |
| <span class="source-line-no">159</span><span id="line-159"> LOG.debug("Conflict detected by nonce: " + nk + ", " + oldResult);</span> |
| <span class="source-line-no">160</span><span id="line-160"> if (oldState != OperationContext.WAIT) {</span> |
| <span class="source-line-no">161</span><span id="line-161"> return oldState == OperationContext.PROCEED; // operation ended</span> |
| <span class="source-line-no">162</span><span id="line-162"> }</span> |
| <span class="source-line-no">163</span><span id="line-163"> oldResult.setHasWait();</span> |
| <span class="source-line-no">164</span><span id="line-164"> oldResult.wait(this.conflictWaitIterationMs); // operation is still active... wait and loop</span> |
| <span class="source-line-no">165</span><span id="line-165"> if (stoppable.isStopped()) {</span> |
| <span class="source-line-no">166</span><span id="line-166"> throw new InterruptedException("Server stopped");</span> |
| <span class="source-line-no">167</span><span id="line-167"> }</span> |
| <span class="source-line-no">168</span><span id="line-168"> }</span> |
| <span class="source-line-no">169</span><span id="line-169"> }</span> |
| <span class="source-line-no">170</span><span id="line-170"> }</span> |
| <span class="source-line-no">171</span><span id="line-171"></span> |
| <span class="source-line-no">172</span><span id="line-172"> /**</span> |
| <span class="source-line-no">173</span><span id="line-173"> * Ends the operation started by startOperation.</span> |
| <span class="source-line-no">174</span><span id="line-174"> * @param group Nonce group.</span> |
| <span class="source-line-no">175</span><span id="line-175"> * @param nonce Nonce.</span> |
| <span class="source-line-no">176</span><span id="line-176"> * @param success Whether the operation has succeeded.</span> |
| <span class="source-line-no">177</span><span id="line-177"> */</span> |
| <span class="source-line-no">178</span><span id="line-178"> public void endOperation(long group, long nonce, boolean success) {</span> |
| <span class="source-line-no">179</span><span id="line-179"> if (nonce == HConstants.NO_NONCE) return;</span> |
| <span class="source-line-no">180</span><span id="line-180"> NonceKey nk = new NonceKey(group, nonce);</span> |
| <span class="source-line-no">181</span><span id="line-181"> OperationContext newResult = nonces.get(nk);</span> |
| <span class="source-line-no">182</span><span id="line-182"> assert newResult != null;</span> |
| <span class="source-line-no">183</span><span id="line-183"> synchronized (newResult) {</span> |
| <span class="source-line-no">184</span><span id="line-184"> assert newResult.getState() == OperationContext.WAIT;</span> |
| <span class="source-line-no">185</span><span id="line-185"> // If we failed, other retries can proceed.</span> |
| <span class="source-line-no">186</span><span id="line-186"> newResult.setState(success ? OperationContext.DONT_PROCEED : OperationContext.PROCEED);</span> |
| <span class="source-line-no">187</span><span id="line-187"> if (success) {</span> |
| <span class="source-line-no">188</span><span id="line-188"> newResult.reportActivity(); // Set time to use for cleanup.</span> |
| <span class="source-line-no">189</span><span id="line-189"> } else {</span> |
| <span class="source-line-no">190</span><span id="line-190"> OperationContext val = nonces.remove(nk);</span> |
| <span class="source-line-no">191</span><span id="line-191"> assert val == newResult;</span> |
| <span class="source-line-no">192</span><span id="line-192"> }</span> |
| <span class="source-line-no">193</span><span id="line-193"> if (newResult.hasWait()) {</span> |
| <span class="source-line-no">194</span><span id="line-194"> LOG.debug("Conflict with running op ended: " + nk + ", " + newResult);</span> |
| <span class="source-line-no">195</span><span id="line-195"> newResult.notifyAll();</span> |
| <span class="source-line-no">196</span><span id="line-196"> }</span> |
| <span class="source-line-no">197</span><span id="line-197"> }</span> |
| <span class="source-line-no">198</span><span id="line-198"> }</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"> * Store the write point in OperationContext when the operation succeed.</span> |
| <span class="source-line-no">202</span><span id="line-202"> * @param group Nonce group.</span> |
| <span class="source-line-no">203</span><span id="line-203"> * @param nonce Nonce.</span> |
| <span class="source-line-no">204</span><span id="line-204"> * @param mvcc Write point of the succeed operation.</span> |
| <span class="source-line-no">205</span><span id="line-205"> */</span> |
| <span class="source-line-no">206</span><span id="line-206"> public void addMvccToOperationContext(long group, long nonce, long mvcc) {</span> |
| <span class="source-line-no">207</span><span id="line-207"> if (nonce == HConstants.NO_NONCE) {</span> |
| <span class="source-line-no">208</span><span id="line-208"> return;</span> |
| <span class="source-line-no">209</span><span id="line-209"> }</span> |
| <span class="source-line-no">210</span><span id="line-210"> NonceKey nk = new NonceKey(group, nonce);</span> |
| <span class="source-line-no">211</span><span id="line-211"> OperationContext result = nonces.get(nk);</span> |
| <span class="source-line-no">212</span><span id="line-212"> assert result != null;</span> |
| <span class="source-line-no">213</span><span id="line-213"> synchronized (result) {</span> |
| <span class="source-line-no">214</span><span id="line-214"> result.setMvcc(mvcc);</span> |
| <span class="source-line-no">215</span><span id="line-215"> }</span> |
| <span class="source-line-no">216</span><span id="line-216"> }</span> |
| <span class="source-line-no">217</span><span id="line-217"></span> |
| <span class="source-line-no">218</span><span id="line-218"> /**</span> |
| <span class="source-line-no">219</span><span id="line-219"> * Return the write point of the previous succeed operation.</span> |
| <span class="source-line-no">220</span><span id="line-220"> * @param group Nonce group.</span> |
| <span class="source-line-no">221</span><span id="line-221"> * @param nonce Nonce.</span> |
| <span class="source-line-no">222</span><span id="line-222"> * @return write point of the previous succeed operation.</span> |
| <span class="source-line-no">223</span><span id="line-223"> */</span> |
| <span class="source-line-no">224</span><span id="line-224"> public long getMvccFromOperationContext(long group, long nonce) {</span> |
| <span class="source-line-no">225</span><span id="line-225"> if (nonce == HConstants.NO_NONCE) {</span> |
| <span class="source-line-no">226</span><span id="line-226"> return Long.MAX_VALUE;</span> |
| <span class="source-line-no">227</span><span id="line-227"> }</span> |
| <span class="source-line-no">228</span><span id="line-228"> NonceKey nk = new NonceKey(group, nonce);</span> |
| <span class="source-line-no">229</span><span id="line-229"> OperationContext result = nonces.get(nk);</span> |
| <span class="source-line-no">230</span><span id="line-230"> return result == null ? Long.MAX_VALUE : result.getMvcc();</span> |
| <span class="source-line-no">231</span><span id="line-231"> }</span> |
| <span class="source-line-no">232</span><span id="line-232"></span> |
| <span class="source-line-no">233</span><span id="line-233"> /**</span> |
| <span class="source-line-no">234</span><span id="line-234"> * Reports the operation from WAL during replay.</span> |
| <span class="source-line-no">235</span><span id="line-235"> * @param group Nonce group.</span> |
| <span class="source-line-no">236</span><span id="line-236"> * @param nonce Nonce.</span> |
| <span class="source-line-no">237</span><span id="line-237"> * @param writeTime Entry write time, used to ignore entries that are too old.</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 void reportOperationFromWal(long group, long nonce, long writeTime) {</span> |
| <span class="source-line-no">240</span><span id="line-240"> if (nonce == HConstants.NO_NONCE) return;</span> |
| <span class="source-line-no">241</span><span id="line-241"> // Give the write time some slack in case the clocks are not synchronized.</span> |
| <span class="source-line-no">242</span><span id="line-242"> long now = EnvironmentEdgeManager.currentTime();</span> |
| <span class="source-line-no">243</span><span id="line-243"> if (now > writeTime + (deleteNonceGracePeriod * 1.5)) return;</span> |
| <span class="source-line-no">244</span><span id="line-244"> OperationContext newResult = new OperationContext();</span> |
| <span class="source-line-no">245</span><span id="line-245"> newResult.setState(OperationContext.DONT_PROCEED);</span> |
| <span class="source-line-no">246</span><span id="line-246"> NonceKey nk = new NonceKey(group, nonce);</span> |
| <span class="source-line-no">247</span><span id="line-247"> OperationContext oldResult = nonces.putIfAbsent(nk, newResult);</span> |
| <span class="source-line-no">248</span><span id="line-248"> if (oldResult != null) {</span> |
| <span class="source-line-no">249</span><span id="line-249"> // Some schemes can have collisions (for example, expiring hashes), so just log it.</span> |
| <span class="source-line-no">250</span><span id="line-250"> // We have no idea about the semantics here, so this is the least of many evils.</span> |
| <span class="source-line-no">251</span><span id="line-251"> LOG.warn(</span> |
| <span class="source-line-no">252</span><span id="line-252"> "Nonce collision during WAL recovery: " + nk + ", " + oldResult + " with " + newResult);</span> |
| <span class="source-line-no">253</span><span id="line-253"> }</span> |
| <span class="source-line-no">254</span><span id="line-254"> }</span> |
| <span class="source-line-no">255</span><span id="line-255"></span> |
| <span class="source-line-no">256</span><span id="line-256"> /**</span> |
| <span class="source-line-no">257</span><span id="line-257"> * Creates a scheduled chore that is used to clean up old nonces.</span> |
| <span class="source-line-no">258</span><span id="line-258"> * @param stoppable Stoppable for the chore.</span> |
| <span class="source-line-no">259</span><span id="line-259"> * @return ScheduledChore; the scheduled chore is not started.</span> |
| <span class="source-line-no">260</span><span id="line-260"> */</span> |
| <span class="source-line-no">261</span><span id="line-261"> public ScheduledChore createCleanupScheduledChore(Stoppable stoppable) {</span> |
| <span class="source-line-no">262</span><span id="line-262"> // By default, it will run every 6 minutes (30 / 5).</span> |
| <span class="source-line-no">263</span><span id="line-263"> return new ScheduledChore("nonceCleaner", stoppable, deleteNonceGracePeriod / 5) {</span> |
| <span class="source-line-no">264</span><span id="line-264"> @Override</span> |
| <span class="source-line-no">265</span><span id="line-265"> protected void chore() {</span> |
| <span class="source-line-no">266</span><span id="line-266"> cleanUpOldNonces();</span> |
| <span class="source-line-no">267</span><span id="line-267"> }</span> |
| <span class="source-line-no">268</span><span id="line-268"> };</span> |
| <span class="source-line-no">269</span><span id="line-269"> }</span> |
| <span class="source-line-no">270</span><span id="line-270"></span> |
| <span class="source-line-no">271</span><span id="line-271"> private void cleanUpOldNonces() {</span> |
| <span class="source-line-no">272</span><span id="line-272"> long cutoff = EnvironmentEdgeManager.currentTime() - deleteNonceGracePeriod;</span> |
| <span class="source-line-no">273</span><span id="line-273"> for (Map.Entry<NonceKey, OperationContext> entry : nonces.entrySet()) {</span> |
| <span class="source-line-no">274</span><span id="line-274"> OperationContext oc = entry.getValue();</span> |
| <span class="source-line-no">275</span><span id="line-275"> if (!oc.isExpired(cutoff)) continue;</span> |
| <span class="source-line-no">276</span><span id="line-276"> synchronized (oc) {</span> |
| <span class="source-line-no">277</span><span id="line-277"> if (oc.getState() == OperationContext.WAIT || !oc.isExpired(cutoff)) continue;</span> |
| <span class="source-line-no">278</span><span id="line-278"> nonces.remove(entry.getKey());</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"> }</span> |
| <span class="source-line-no">282</span><span id="line-282">}</span> |
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| </pre> |
| </div> |
| </main> |
| </body> |
| </html> |
