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| <pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a> |
| <span class="sourceLineNo">002</span> *<a name="line.2"></a> |
| <span class="sourceLineNo">003</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.3"></a> |
| <span class="sourceLineNo">004</span> * or more contributor license agreements. See the NOTICE file<a name="line.4"></a> |
| <span class="sourceLineNo">005</span> * distributed with this work for additional information<a name="line.5"></a> |
| <span class="sourceLineNo">006</span> * regarding copyright ownership. The ASF licenses this file<a name="line.6"></a> |
| <span class="sourceLineNo">007</span> * to you under the Apache License, Version 2.0 (the<a name="line.7"></a> |
| <span class="sourceLineNo">008</span> * "License"); you may not use this file except in compliance<a name="line.8"></a> |
| <span class="sourceLineNo">009</span> * with the License. You may obtain a copy of the License at<a name="line.9"></a> |
| <span class="sourceLineNo">010</span> *<a name="line.10"></a> |
| <span class="sourceLineNo">011</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.11"></a> |
| <span class="sourceLineNo">012</span> *<a name="line.12"></a> |
| <span class="sourceLineNo">013</span> * Unless required by applicable law or agreed to in writing, software<a name="line.13"></a> |
| <span class="sourceLineNo">014</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> * See the License for the specific language governing permissions and<a name="line.16"></a> |
| <span class="sourceLineNo">017</span> * limitations under the License.<a name="line.17"></a> |
| <span class="sourceLineNo">018</span> */<a name="line.18"></a> |
| <span class="sourceLineNo">019</span>package org.apache.hadoop.hbase.regionserver;<a name="line.19"></a> |
| <span class="sourceLineNo">020</span><a name="line.20"></a> |
| <span class="sourceLineNo">021</span>import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import org.apache.hbase.thirdparty.com.google.common.base.MoreObjects;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import org.apache.hbase.thirdparty.com.google.common.base.MoreObjects.ToStringHelper;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span><a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import java.util.LinkedList;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import java.util.concurrent.atomic.AtomicLong;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span><a name="line.27"></a> |
| <span class="sourceLineNo">028</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.28"></a> |
| <span class="sourceLineNo">029</span>import org.slf4j.Logger;<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>import org.slf4j.LoggerFactory;<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.31"></a> |
| <span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.util.ClassSize;<a name="line.32"></a> |
| <span class="sourceLineNo">033</span><a name="line.33"></a> |
| <span class="sourceLineNo">034</span><a name="line.34"></a> |
| <span class="sourceLineNo">035</span>/**<a name="line.35"></a> |
| <span class="sourceLineNo">036</span> * Manages the read/write consistency. This provides an interface for readers to determine what<a name="line.36"></a> |
| <span class="sourceLineNo">037</span> * entries to ignore, and a mechanism for writers to obtain new write numbers, then "commit"<a name="line.37"></a> |
| <span class="sourceLineNo">038</span> * the new writes for readers to read (thus forming atomic transactions).<a name="line.38"></a> |
| <span class="sourceLineNo">039</span> */<a name="line.39"></a> |
| <span class="sourceLineNo">040</span>@InterfaceAudience.Private<a name="line.40"></a> |
| <span class="sourceLineNo">041</span>public class MultiVersionConcurrencyControl {<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> private static final Logger LOG = LoggerFactory.getLogger(MultiVersionConcurrencyControl.class);<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> private static final long READPOINT_ADVANCE_WAIT_TIME = 10L;<a name="line.43"></a> |
| <span class="sourceLineNo">044</span><a name="line.44"></a> |
| <span class="sourceLineNo">045</span> final String regionName;<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> final AtomicLong readPoint = new AtomicLong(0);<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> final AtomicLong writePoint = new AtomicLong(0);<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> private final Object readWaiters = new Object();<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> /**<a name="line.49"></a> |
| <span class="sourceLineNo">050</span> * Represents no value, or not set.<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> */<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> public static final long NONE = -1;<a name="line.52"></a> |
| <span class="sourceLineNo">053</span><a name="line.53"></a> |
| <span class="sourceLineNo">054</span> // This is the pending queue of writes.<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> //<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> // TODO(eclark): Should this be an array of fixed size to<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> // reduce the number of allocations on the write path?<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> // This could be equal to the number of handlers + a small number.<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> // TODO: St.Ack 20150903 Sounds good to me.<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> private final LinkedList<WriteEntry> writeQueue = new LinkedList<>();<a name="line.60"></a> |
| <span class="sourceLineNo">061</span><a name="line.61"></a> |
| <span class="sourceLineNo">062</span> public MultiVersionConcurrencyControl() {<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> this(null);<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> }<a name="line.64"></a> |
| <span class="sourceLineNo">065</span><a name="line.65"></a> |
| <span class="sourceLineNo">066</span> public MultiVersionConcurrencyControl(String regionName) {<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> this.regionName = regionName;<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> }<a name="line.68"></a> |
| <span class="sourceLineNo">069</span><a name="line.69"></a> |
| <span class="sourceLineNo">070</span> /**<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> * Construct and set read point. Write point is uninitialized.<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> */<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> public MultiVersionConcurrencyControl(long startPoint) {<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> this(null);<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> tryAdvanceTo(startPoint, NONE);<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> }<a name="line.76"></a> |
| <span class="sourceLineNo">077</span><a name="line.77"></a> |
| <span class="sourceLineNo">078</span> /**<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> * Step the MVCC forward on to a new read/write basis.<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> * @param newStartPoint<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> */<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> public void advanceTo(long newStartPoint) {<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> while (true) {<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> long seqId = this.getWritePoint();<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> if (seqId >= newStartPoint) {<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> break;<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> }<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> if (this.tryAdvanceTo(newStartPoint, seqId)) {<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> break;<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> }<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> }<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> }<a name="line.92"></a> |
| <span class="sourceLineNo">093</span><a name="line.93"></a> |
| <span class="sourceLineNo">094</span> /**<a name="line.94"></a> |
| <span class="sourceLineNo">095</span> * Step the MVCC forward on to a new read/write basis.<a name="line.95"></a> |
| <span class="sourceLineNo">096</span> * @param newStartPoint Point to move read and write points to.<a name="line.96"></a> |
| <span class="sourceLineNo">097</span> * @param expected If not -1 (#NONE)<a name="line.97"></a> |
| <span class="sourceLineNo">098</span> * @return Returns false if <code>expected</code> is not equal to the<a name="line.98"></a> |
| <span class="sourceLineNo">099</span> * current <code>readPoint</code> or if <code>startPoint</code> is less than current<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> * <code>readPoint</code><a name="line.100"></a> |
| <span class="sourceLineNo">101</span> */<a name="line.101"></a> |
| <span class="sourceLineNo">102</span> boolean tryAdvanceTo(long newStartPoint, long expected) {<a name="line.102"></a> |
| <span class="sourceLineNo">103</span> synchronized (writeQueue) {<a name="line.103"></a> |
| <span class="sourceLineNo">104</span> long currentRead = this.readPoint.get();<a name="line.104"></a> |
| <span class="sourceLineNo">105</span> long currentWrite = this.writePoint.get();<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> if (currentRead != currentWrite) {<a name="line.106"></a> |
| <span class="sourceLineNo">107</span> throw new RuntimeException("Already used this mvcc; currentRead=" + currentRead +<a name="line.107"></a> |
| <span class="sourceLineNo">108</span> ", currentWrite=" + currentWrite + "; too late to tryAdvanceTo");<a name="line.108"></a> |
| <span class="sourceLineNo">109</span> }<a name="line.109"></a> |
| <span class="sourceLineNo">110</span> if (expected != NONE && expected != currentRead) {<a name="line.110"></a> |
| <span class="sourceLineNo">111</span> return false;<a name="line.111"></a> |
| <span class="sourceLineNo">112</span> }<a name="line.112"></a> |
| <span class="sourceLineNo">113</span><a name="line.113"></a> |
| <span class="sourceLineNo">114</span> if (newStartPoint < currentRead) {<a name="line.114"></a> |
| <span class="sourceLineNo">115</span> return false;<a name="line.115"></a> |
| <span class="sourceLineNo">116</span> }<a name="line.116"></a> |
| <span class="sourceLineNo">117</span><a name="line.117"></a> |
| <span class="sourceLineNo">118</span> readPoint.set(newStartPoint);<a name="line.118"></a> |
| <span class="sourceLineNo">119</span> writePoint.set(newStartPoint);<a name="line.119"></a> |
| <span class="sourceLineNo">120</span> }<a name="line.120"></a> |
| <span class="sourceLineNo">121</span> return true;<a name="line.121"></a> |
| <span class="sourceLineNo">122</span> }<a name="line.122"></a> |
| <span class="sourceLineNo">123</span><a name="line.123"></a> |
| <span class="sourceLineNo">124</span> /**<a name="line.124"></a> |
| <span class="sourceLineNo">125</span> * Call {@link #begin(Runnable)} with an empty {@link Runnable}.<a name="line.125"></a> |
| <span class="sourceLineNo">126</span> */<a name="line.126"></a> |
| <span class="sourceLineNo">127</span> public WriteEntry begin() {<a name="line.127"></a> |
| <span class="sourceLineNo">128</span> return begin(() -> {});<a name="line.128"></a> |
| <span class="sourceLineNo">129</span> }<a name="line.129"></a> |
| <span class="sourceLineNo">130</span><a name="line.130"></a> |
| <span class="sourceLineNo">131</span> /**<a name="line.131"></a> |
| <span class="sourceLineNo">132</span> * Start a write transaction. Create a new {@link WriteEntry} with a new write number and add it<a name="line.132"></a> |
| <span class="sourceLineNo">133</span> * to our queue of ongoing writes. Return this WriteEntry instance. To complete the write<a name="line.133"></a> |
| <span class="sourceLineNo">134</span> * transaction and wait for it to be visible, call {@link #completeAndWait(WriteEntry)}. If the<a name="line.134"></a> |
| <span class="sourceLineNo">135</span> * write failed, call {@link #complete(WriteEntry)} so we can clean up AFTER removing ALL trace of<a name="line.135"></a> |
| <span class="sourceLineNo">136</span> * the failed write transaction.<a name="line.136"></a> |
| <span class="sourceLineNo">137</span> * <p><a name="line.137"></a> |
| <span class="sourceLineNo">138</span> * The {@code action} will be executed under the lock which means it can keep the same order with<a name="line.138"></a> |
| <span class="sourceLineNo">139</span> * mvcc.<a name="line.139"></a> |
| <span class="sourceLineNo">140</span> * @see #complete(WriteEntry)<a name="line.140"></a> |
| <span class="sourceLineNo">141</span> * @see #completeAndWait(WriteEntry)<a name="line.141"></a> |
| <span class="sourceLineNo">142</span> */<a name="line.142"></a> |
| <span class="sourceLineNo">143</span> public WriteEntry begin(Runnable action) {<a name="line.143"></a> |
| <span class="sourceLineNo">144</span> synchronized (writeQueue) {<a name="line.144"></a> |
| <span class="sourceLineNo">145</span> long nextWriteNumber = writePoint.incrementAndGet();<a name="line.145"></a> |
| <span class="sourceLineNo">146</span> WriteEntry e = new WriteEntry(nextWriteNumber);<a name="line.146"></a> |
| <span class="sourceLineNo">147</span> writeQueue.add(e);<a name="line.147"></a> |
| <span class="sourceLineNo">148</span> action.run();<a name="line.148"></a> |
| <span class="sourceLineNo">149</span> return e;<a name="line.149"></a> |
| <span class="sourceLineNo">150</span> }<a name="line.150"></a> |
| <span class="sourceLineNo">151</span> }<a name="line.151"></a> |
| <span class="sourceLineNo">152</span><a name="line.152"></a> |
| <span class="sourceLineNo">153</span> /**<a name="line.153"></a> |
| <span class="sourceLineNo">154</span> * Wait until the read point catches up to the write point; i.e. wait on all outstanding mvccs<a name="line.154"></a> |
| <span class="sourceLineNo">155</span> * to complete.<a name="line.155"></a> |
| <span class="sourceLineNo">156</span> */<a name="line.156"></a> |
| <span class="sourceLineNo">157</span> public void await() {<a name="line.157"></a> |
| <span class="sourceLineNo">158</span> // Add a write and then wait on reads to catch up to it.<a name="line.158"></a> |
| <span class="sourceLineNo">159</span> completeAndWait(begin());<a name="line.159"></a> |
| <span class="sourceLineNo">160</span> }<a name="line.160"></a> |
| <span class="sourceLineNo">161</span><a name="line.161"></a> |
| <span class="sourceLineNo">162</span> /**<a name="line.162"></a> |
| <span class="sourceLineNo">163</span> * Complete a {@link WriteEntry} that was created by {@link #begin()} then wait until the<a name="line.163"></a> |
| <span class="sourceLineNo">164</span> * read point catches up to our write.<a name="line.164"></a> |
| <span class="sourceLineNo">165</span> *<a name="line.165"></a> |
| <span class="sourceLineNo">166</span> * At the end of this call, the global read point is at least as large as the write point<a name="line.166"></a> |
| <span class="sourceLineNo">167</span> * of the passed in WriteEntry. Thus, the write is visible to MVCC readers.<a name="line.167"></a> |
| <span class="sourceLineNo">168</span> */<a name="line.168"></a> |
| <span class="sourceLineNo">169</span> public void completeAndWait(WriteEntry e) {<a name="line.169"></a> |
| <span class="sourceLineNo">170</span> if (!complete(e)) {<a name="line.170"></a> |
| <span class="sourceLineNo">171</span> waitForRead(e);<a name="line.171"></a> |
| <span class="sourceLineNo">172</span> }<a name="line.172"></a> |
| <span class="sourceLineNo">173</span> }<a name="line.173"></a> |
| <span class="sourceLineNo">174</span><a name="line.174"></a> |
| <span class="sourceLineNo">175</span> /**<a name="line.175"></a> |
| <span class="sourceLineNo">176</span> * Mark the {@link WriteEntry} as complete and advance the read point as much as possible.<a name="line.176"></a> |
| <span class="sourceLineNo">177</span> * Call this even if the write has FAILED (AFTER backing out the write transaction<a name="line.177"></a> |
| <span class="sourceLineNo">178</span> * changes completely) so we can clean up the outstanding transaction.<a name="line.178"></a> |
| <span class="sourceLineNo">179</span> *<a name="line.179"></a> |
| <span class="sourceLineNo">180</span> * How much is the read point advanced?<a name="line.180"></a> |
| <span class="sourceLineNo">181</span> *<a name="line.181"></a> |
| <span class="sourceLineNo">182</span> * Let S be the set of all write numbers that are completed. Set the read point to the highest<a name="line.182"></a> |
| <span class="sourceLineNo">183</span> * numbered write of S.<a name="line.183"></a> |
| <span class="sourceLineNo">184</span> *<a name="line.184"></a> |
| <span class="sourceLineNo">185</span> * @param writeEntry<a name="line.185"></a> |
| <span class="sourceLineNo">186</span> *<a name="line.186"></a> |
| <span class="sourceLineNo">187</span> * @return true if e is visible to MVCC readers (that is, readpoint >= e.writeNumber)<a name="line.187"></a> |
| <span class="sourceLineNo">188</span> */<a name="line.188"></a> |
| <span class="sourceLineNo">189</span> public boolean complete(WriteEntry writeEntry) {<a name="line.189"></a> |
| <span class="sourceLineNo">190</span> synchronized (writeQueue) {<a name="line.190"></a> |
| <span class="sourceLineNo">191</span> writeEntry.markCompleted();<a name="line.191"></a> |
| <span class="sourceLineNo">192</span> long nextReadValue = NONE;<a name="line.192"></a> |
| <span class="sourceLineNo">193</span> boolean ranOnce = false;<a name="line.193"></a> |
| <span class="sourceLineNo">194</span> while (!writeQueue.isEmpty()) {<a name="line.194"></a> |
| <span class="sourceLineNo">195</span> ranOnce = true;<a name="line.195"></a> |
| <span class="sourceLineNo">196</span> WriteEntry queueFirst = writeQueue.getFirst();<a name="line.196"></a> |
| <span class="sourceLineNo">197</span><a name="line.197"></a> |
| <span class="sourceLineNo">198</span> if (nextReadValue > 0) {<a name="line.198"></a> |
| <span class="sourceLineNo">199</span> if (nextReadValue + 1 != queueFirst.getWriteNumber()) {<a name="line.199"></a> |
| <span class="sourceLineNo">200</span> throw new RuntimeException("Invariant in complete violated, nextReadValue="<a name="line.200"></a> |
| <span class="sourceLineNo">201</span> + nextReadValue + ", writeNumber=" + queueFirst.getWriteNumber());<a name="line.201"></a> |
| <span class="sourceLineNo">202</span> }<a name="line.202"></a> |
| <span class="sourceLineNo">203</span> }<a name="line.203"></a> |
| <span class="sourceLineNo">204</span><a name="line.204"></a> |
| <span class="sourceLineNo">205</span> if (queueFirst.isCompleted()) {<a name="line.205"></a> |
| <span class="sourceLineNo">206</span> nextReadValue = queueFirst.getWriteNumber();<a name="line.206"></a> |
| <span class="sourceLineNo">207</span> writeQueue.removeFirst();<a name="line.207"></a> |
| <span class="sourceLineNo">208</span> } else {<a name="line.208"></a> |
| <span class="sourceLineNo">209</span> break;<a name="line.209"></a> |
| <span class="sourceLineNo">210</span> }<a name="line.210"></a> |
| <span class="sourceLineNo">211</span> }<a name="line.211"></a> |
| <span class="sourceLineNo">212</span><a name="line.212"></a> |
| <span class="sourceLineNo">213</span> if (!ranOnce) {<a name="line.213"></a> |
| <span class="sourceLineNo">214</span> throw new RuntimeException("There is no first!");<a name="line.214"></a> |
| <span class="sourceLineNo">215</span> }<a name="line.215"></a> |
| <span class="sourceLineNo">216</span><a name="line.216"></a> |
| <span class="sourceLineNo">217</span> if (nextReadValue > 0) {<a name="line.217"></a> |
| <span class="sourceLineNo">218</span> synchronized (readWaiters) {<a name="line.218"></a> |
| <span class="sourceLineNo">219</span> readPoint.set(nextReadValue);<a name="line.219"></a> |
| <span class="sourceLineNo">220</span> readWaiters.notifyAll();<a name="line.220"></a> |
| <span class="sourceLineNo">221</span> }<a name="line.221"></a> |
| <span class="sourceLineNo">222</span> }<a name="line.222"></a> |
| <span class="sourceLineNo">223</span> return readPoint.get() >= writeEntry.getWriteNumber();<a name="line.223"></a> |
| <span class="sourceLineNo">224</span> }<a name="line.224"></a> |
| <span class="sourceLineNo">225</span> }<a name="line.225"></a> |
| <span class="sourceLineNo">226</span><a name="line.226"></a> |
| <span class="sourceLineNo">227</span> /**<a name="line.227"></a> |
| <span class="sourceLineNo">228</span> * Wait for the global readPoint to advance up to the passed in write entry number.<a name="line.228"></a> |
| <span class="sourceLineNo">229</span> */<a name="line.229"></a> |
| <span class="sourceLineNo">230</span> void waitForRead(WriteEntry e) {<a name="line.230"></a> |
| <span class="sourceLineNo">231</span> boolean interrupted = false;<a name="line.231"></a> |
| <span class="sourceLineNo">232</span> int count = 0;<a name="line.232"></a> |
| <span class="sourceLineNo">233</span> synchronized (readWaiters) {<a name="line.233"></a> |
| <span class="sourceLineNo">234</span> while (readPoint.get() < e.getWriteNumber()) {<a name="line.234"></a> |
| <span class="sourceLineNo">235</span> if (count % 100 == 0 && count > 0) {<a name="line.235"></a> |
| <span class="sourceLineNo">236</span> long totalWaitTillNow = READPOINT_ADVANCE_WAIT_TIME * count;<a name="line.236"></a> |
| <span class="sourceLineNo">237</span> LOG.warn("STUCK for : " + totalWaitTillNow + " millis. " + this);<a name="line.237"></a> |
| <span class="sourceLineNo">238</span> }<a name="line.238"></a> |
| <span class="sourceLineNo">239</span> count++;<a name="line.239"></a> |
| <span class="sourceLineNo">240</span> try {<a name="line.240"></a> |
| <span class="sourceLineNo">241</span> readWaiters.wait(READPOINT_ADVANCE_WAIT_TIME);<a name="line.241"></a> |
| <span class="sourceLineNo">242</span> } catch (InterruptedException ie) {<a name="line.242"></a> |
| <span class="sourceLineNo">243</span> // We were interrupted... finish the loop -- i.e. cleanup --and then<a name="line.243"></a> |
| <span class="sourceLineNo">244</span> // on our way out, reset the interrupt flag.<a name="line.244"></a> |
| <span class="sourceLineNo">245</span> interrupted = true;<a name="line.245"></a> |
| <span class="sourceLineNo">246</span> }<a name="line.246"></a> |
| <span class="sourceLineNo">247</span> }<a name="line.247"></a> |
| <span class="sourceLineNo">248</span> }<a name="line.248"></a> |
| <span class="sourceLineNo">249</span> if (interrupted) {<a name="line.249"></a> |
| <span class="sourceLineNo">250</span> Thread.currentThread().interrupt();<a name="line.250"></a> |
| <span class="sourceLineNo">251</span> }<a name="line.251"></a> |
| <span class="sourceLineNo">252</span> }<a name="line.252"></a> |
| <span class="sourceLineNo">253</span><a name="line.253"></a> |
| <span class="sourceLineNo">254</span> @VisibleForTesting<a name="line.254"></a> |
| <span class="sourceLineNo">255</span> @Override<a name="line.255"></a> |
| <span class="sourceLineNo">256</span> public String toString() {<a name="line.256"></a> |
| <span class="sourceLineNo">257</span> ToStringHelper helper = MoreObjects.toStringHelper(this).add("readPoint", readPoint)<a name="line.257"></a> |
| <span class="sourceLineNo">258</span> .add("writePoint", writePoint);<a name="line.258"></a> |
| <span class="sourceLineNo">259</span> if (this.regionName != null) {<a name="line.259"></a> |
| <span class="sourceLineNo">260</span> helper.add("regionName", this.regionName);<a name="line.260"></a> |
| <span class="sourceLineNo">261</span> }<a name="line.261"></a> |
| <span class="sourceLineNo">262</span> return helper.toString();<a name="line.262"></a> |
| <span class="sourceLineNo">263</span> }<a name="line.263"></a> |
| <span class="sourceLineNo">264</span><a name="line.264"></a> |
| <span class="sourceLineNo">265</span> public long getReadPoint() {<a name="line.265"></a> |
| <span class="sourceLineNo">266</span> return readPoint.get();<a name="line.266"></a> |
| <span class="sourceLineNo">267</span> }<a name="line.267"></a> |
| <span class="sourceLineNo">268</span><a name="line.268"></a> |
| <span class="sourceLineNo">269</span> @VisibleForTesting<a name="line.269"></a> |
| <span class="sourceLineNo">270</span> public long getWritePoint() {<a name="line.270"></a> |
| <span class="sourceLineNo">271</span> return writePoint.get();<a name="line.271"></a> |
| <span class="sourceLineNo">272</span> }<a name="line.272"></a> |
| <span class="sourceLineNo">273</span><a name="line.273"></a> |
| <span class="sourceLineNo">274</span> /**<a name="line.274"></a> |
| <span class="sourceLineNo">275</span> * Write number and whether write has completed given out at start of a write transaction.<a name="line.275"></a> |
| <span class="sourceLineNo">276</span> * Every created WriteEntry must be completed by calling mvcc#complete or #completeAndWait.<a name="line.276"></a> |
| <span class="sourceLineNo">277</span> */<a name="line.277"></a> |
| <span class="sourceLineNo">278</span> @InterfaceAudience.Private<a name="line.278"></a> |
| <span class="sourceLineNo">279</span> public static class WriteEntry {<a name="line.279"></a> |
| <span class="sourceLineNo">280</span> private final long writeNumber;<a name="line.280"></a> |
| <span class="sourceLineNo">281</span> private boolean completed = false;<a name="line.281"></a> |
| <span class="sourceLineNo">282</span><a name="line.282"></a> |
| <span class="sourceLineNo">283</span> WriteEntry(long writeNumber) {<a name="line.283"></a> |
| <span class="sourceLineNo">284</span> this.writeNumber = writeNumber;<a name="line.284"></a> |
| <span class="sourceLineNo">285</span> }<a name="line.285"></a> |
| <span class="sourceLineNo">286</span><a name="line.286"></a> |
| <span class="sourceLineNo">287</span> void markCompleted() {<a name="line.287"></a> |
| <span class="sourceLineNo">288</span> this.completed = true;<a name="line.288"></a> |
| <span class="sourceLineNo">289</span> }<a name="line.289"></a> |
| <span class="sourceLineNo">290</span><a name="line.290"></a> |
| <span class="sourceLineNo">291</span> boolean isCompleted() {<a name="line.291"></a> |
| <span class="sourceLineNo">292</span> return this.completed;<a name="line.292"></a> |
| <span class="sourceLineNo">293</span> }<a name="line.293"></a> |
| <span class="sourceLineNo">294</span><a name="line.294"></a> |
| <span class="sourceLineNo">295</span> public long getWriteNumber() {<a name="line.295"></a> |
| <span class="sourceLineNo">296</span> return this.writeNumber;<a name="line.296"></a> |
| <span class="sourceLineNo">297</span> }<a name="line.297"></a> |
| <span class="sourceLineNo">298</span><a name="line.298"></a> |
| <span class="sourceLineNo">299</span> @Override<a name="line.299"></a> |
| <span class="sourceLineNo">300</span> public String toString() {<a name="line.300"></a> |
| <span class="sourceLineNo">301</span> return this.writeNumber + ", " + this.completed;<a name="line.301"></a> |
| <span class="sourceLineNo">302</span> }<a name="line.302"></a> |
| <span class="sourceLineNo">303</span> }<a name="line.303"></a> |
| <span class="sourceLineNo">304</span><a name="line.304"></a> |
| <span class="sourceLineNo">305</span> public static final long FIXED_SIZE = ClassSize.align(<a name="line.305"></a> |
| <span class="sourceLineNo">306</span> ClassSize.OBJECT +<a name="line.306"></a> |
| <span class="sourceLineNo">307</span> 2 * Bytes.SIZEOF_LONG +<a name="line.307"></a> |
| <span class="sourceLineNo">308</span> 2 * ClassSize.REFERENCE);<a name="line.308"></a> |
| <span class="sourceLineNo">309</span>}<a name="line.309"></a> |
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| </pre> |
| </div> |
| </body> |
| </html> |
