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<pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a>
<span class="sourceLineNo">003</span> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a>
<span class="sourceLineNo">004</span> * distributed with this work for additional information<a name="line.4"></a>
<span class="sourceLineNo">005</span> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a>
<span class="sourceLineNo">006</span> * to you under the Apache License, Version 2.0 (the<a name="line.6"></a>
<span class="sourceLineNo">007</span> * "License"); you may not use this file except in compliance<a name="line.7"></a>
<span class="sourceLineNo">008</span> * with the License. You may obtain a copy of the License at<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
<span class="sourceLineNo">011</span> *<a name="line.11"></a>
<span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a>
<span class="sourceLineNo">013</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a>
<span class="sourceLineNo">014</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a>
<span class="sourceLineNo">015</span> * See the License for the specific language governing permissions and<a name="line.15"></a>
<span class="sourceLineNo">016</span> * limitations under the License.<a name="line.16"></a>
<span class="sourceLineNo">017</span> */<a name="line.17"></a>
<span class="sourceLineNo">018</span>package org.apache.hadoop.hbase.regionserver.wal;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>import static org.apache.hadoop.hbase.regionserver.wal.WALActionsListener.RollRequestReason.ERROR;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import static org.apache.hadoop.hbase.regionserver.wal.WALActionsListener.RollRequestReason.SIZE;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import static org.apache.hadoop.hbase.util.FutureUtils.addListener;<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>import com.lmax.disruptor.RingBuffer;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import com.lmax.disruptor.Sequence;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import com.lmax.disruptor.Sequencer;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import java.io.IOException;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.lang.reflect.Field;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import java.util.ArrayDeque;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import java.util.Comparator;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import java.util.Deque;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import java.util.Iterator;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import java.util.List;<a name="line.33"></a>
<span class="sourceLineNo">034</span>import java.util.Queue;<a name="line.34"></a>
<span class="sourceLineNo">035</span>import java.util.SortedSet;<a name="line.35"></a>
<span class="sourceLineNo">036</span>import java.util.TreeSet;<a name="line.36"></a>
<span class="sourceLineNo">037</span>import java.util.concurrent.ExecutorService;<a name="line.37"></a>
<span class="sourceLineNo">038</span>import java.util.concurrent.Executors;<a name="line.38"></a>
<span class="sourceLineNo">039</span>import java.util.concurrent.LinkedBlockingQueue;<a name="line.39"></a>
<span class="sourceLineNo">040</span>import java.util.concurrent.ThreadPoolExecutor;<a name="line.40"></a>
<span class="sourceLineNo">041</span>import java.util.concurrent.TimeUnit;<a name="line.41"></a>
<span class="sourceLineNo">042</span>import java.util.concurrent.atomic.AtomicBoolean;<a name="line.42"></a>
<span class="sourceLineNo">043</span>import java.util.concurrent.locks.Condition;<a name="line.43"></a>
<span class="sourceLineNo">044</span>import java.util.concurrent.locks.Lock;<a name="line.44"></a>
<span class="sourceLineNo">045</span>import java.util.concurrent.locks.ReentrantLock;<a name="line.45"></a>
<span class="sourceLineNo">046</span>import java.util.function.Supplier;<a name="line.46"></a>
<span class="sourceLineNo">047</span>import org.apache.hadoop.conf.Configuration;<a name="line.47"></a>
<span class="sourceLineNo">048</span>import org.apache.hadoop.fs.FileSystem;<a name="line.48"></a>
<span class="sourceLineNo">049</span>import org.apache.hadoop.fs.Path;<a name="line.49"></a>
<span class="sourceLineNo">050</span>import org.apache.hadoop.hbase.HBaseInterfaceAudience;<a name="line.50"></a>
<span class="sourceLineNo">051</span>import org.apache.hadoop.hbase.client.RegionInfo;<a name="line.51"></a>
<span class="sourceLineNo">052</span>import org.apache.hadoop.hbase.io.asyncfs.AsyncFSOutput;<a name="line.52"></a>
<span class="sourceLineNo">053</span>import org.apache.hadoop.hbase.trace.TraceUtil;<a name="line.53"></a>
<span class="sourceLineNo">054</span>import org.apache.hadoop.hbase.wal.AsyncFSWALProvider;<a name="line.54"></a>
<span class="sourceLineNo">055</span>import org.apache.hadoop.hbase.wal.WALEdit;<a name="line.55"></a>
<span class="sourceLineNo">056</span>import org.apache.hadoop.hbase.wal.WALKeyImpl;<a name="line.56"></a>
<span class="sourceLineNo">057</span>import org.apache.hadoop.hbase.wal.WALProvider.AsyncWriter;<a name="line.57"></a>
<span class="sourceLineNo">058</span>import org.apache.hadoop.hdfs.protocol.DatanodeInfo;<a name="line.58"></a>
<span class="sourceLineNo">059</span>import org.apache.htrace.core.TraceScope;<a name="line.59"></a>
<span class="sourceLineNo">060</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.60"></a>
<span class="sourceLineNo">061</span>import org.slf4j.Logger;<a name="line.61"></a>
<span class="sourceLineNo">062</span>import org.slf4j.LoggerFactory;<a name="line.62"></a>
<span class="sourceLineNo">063</span><a name="line.63"></a>
<span class="sourceLineNo">064</span>import org.apache.hbase.thirdparty.com.google.common.base.Preconditions;<a name="line.64"></a>
<span class="sourceLineNo">065</span>import org.apache.hbase.thirdparty.com.google.common.util.concurrent.ThreadFactoryBuilder;<a name="line.65"></a>
<span class="sourceLineNo">066</span>import org.apache.hbase.thirdparty.io.netty.channel.Channel;<a name="line.66"></a>
<span class="sourceLineNo">067</span>import org.apache.hbase.thirdparty.io.netty.channel.EventLoop;<a name="line.67"></a>
<span class="sourceLineNo">068</span>import org.apache.hbase.thirdparty.io.netty.channel.EventLoopGroup;<a name="line.68"></a>
<span class="sourceLineNo">069</span>import org.apache.hbase.thirdparty.io.netty.util.concurrent.SingleThreadEventExecutor;<a name="line.69"></a>
<span class="sourceLineNo">070</span><a name="line.70"></a>
<span class="sourceLineNo">071</span>/**<a name="line.71"></a>
<span class="sourceLineNo">072</span> * An asynchronous implementation of FSWAL.<a name="line.72"></a>
<span class="sourceLineNo">073</span> * &lt;p&gt;<a name="line.73"></a>
<span class="sourceLineNo">074</span> * Here 'waitingConsumePayloads' acts as the RingBuffer in FSHLog.<a name="line.74"></a>
<span class="sourceLineNo">075</span> * &lt;p&gt;<a name="line.75"></a>
<span class="sourceLineNo">076</span> * For append, we process it as follow:<a name="line.76"></a>
<span class="sourceLineNo">077</span> * &lt;ol&gt;<a name="line.77"></a>
<span class="sourceLineNo">078</span> * &lt;li&gt;In the caller thread(typically, in the rpc handler thread):<a name="line.78"></a>
<span class="sourceLineNo">079</span> * &lt;ol&gt;<a name="line.79"></a>
<span class="sourceLineNo">080</span> * &lt;li&gt;Insert the entry into 'waitingConsumePayloads'. Use ringbuffer sequence as txid.&lt;/li&gt;<a name="line.80"></a>
<span class="sourceLineNo">081</span> * &lt;li&gt;Schedule the consumer task if needed. See {@link #shouldScheduleConsumer()} for more details.<a name="line.81"></a>
<span class="sourceLineNo">082</span> * &lt;/li&gt;<a name="line.82"></a>
<span class="sourceLineNo">083</span> * &lt;/ol&gt;<a name="line.83"></a>
<span class="sourceLineNo">084</span> * &lt;/li&gt;<a name="line.84"></a>
<span class="sourceLineNo">085</span> * &lt;li&gt;In the consumer task(executed in a single threaded thread pool)<a name="line.85"></a>
<span class="sourceLineNo">086</span> * &lt;ol&gt;<a name="line.86"></a>
<span class="sourceLineNo">087</span> * &lt;li&gt;Poll the entry from {@link #waitingConsumePayloads} and insert it into<a name="line.87"></a>
<span class="sourceLineNo">088</span> * {@link #toWriteAppends}&lt;/li&gt;<a name="line.88"></a>
<span class="sourceLineNo">089</span> * &lt;li&gt;Poll the entry from {@link #toWriteAppends}, append it to the AsyncWriter, and insert it into<a name="line.89"></a>
<span class="sourceLineNo">090</span> * {@link #unackedAppends}&lt;/li&gt;<a name="line.90"></a>
<span class="sourceLineNo">091</span> * &lt;li&gt;If the buffered size reaches {@link #batchSize}, or there is a sync request, then we call<a name="line.91"></a>
<span class="sourceLineNo">092</span> * sync on the AsyncWriter.&lt;/li&gt;<a name="line.92"></a>
<span class="sourceLineNo">093</span> * &lt;li&gt;In the callback methods:<a name="line.93"></a>
<span class="sourceLineNo">094</span> * &lt;ul&gt;<a name="line.94"></a>
<span class="sourceLineNo">095</span> * &lt;li&gt;If succeeded, poll the entry from {@link #unackedAppends} and drop it.&lt;/li&gt;<a name="line.95"></a>
<span class="sourceLineNo">096</span> * &lt;li&gt;If failed, add all the entries in {@link #unackedAppends} back to {@link #toWriteAppends} and<a name="line.96"></a>
<span class="sourceLineNo">097</span> * wait for writing them again.&lt;/li&gt;<a name="line.97"></a>
<span class="sourceLineNo">098</span> * &lt;/ul&gt;<a name="line.98"></a>
<span class="sourceLineNo">099</span> * &lt;/li&gt;<a name="line.99"></a>
<span class="sourceLineNo">100</span> * &lt;/ol&gt;<a name="line.100"></a>
<span class="sourceLineNo">101</span> * &lt;/li&gt;<a name="line.101"></a>
<span class="sourceLineNo">102</span> * &lt;/ol&gt;<a name="line.102"></a>
<span class="sourceLineNo">103</span> * For sync, the processing stages are almost same. And different from FSHLog, we will open a new<a name="line.103"></a>
<span class="sourceLineNo">104</span> * writer and rewrite unacked entries to the new writer and sync again if we hit a sync error.<a name="line.104"></a>
<span class="sourceLineNo">105</span> * &lt;p&gt;<a name="line.105"></a>
<span class="sourceLineNo">106</span> * Here we only describe the logic of doReplaceWriter. The main logic of rollWriter is same with<a name="line.106"></a>
<span class="sourceLineNo">107</span> * FSHLog.&lt;br&gt;<a name="line.107"></a>
<span class="sourceLineNo">108</span> * For a normal roll request(for example, we have reached the log roll size):<a name="line.108"></a>
<span class="sourceLineNo">109</span> * &lt;ol&gt;<a name="line.109"></a>
<span class="sourceLineNo">110</span> * &lt;li&gt;In the log roller thread, we will set {@link #waitingRoll} to true and<a name="line.110"></a>
<span class="sourceLineNo">111</span> * {@link #readyForRolling} to false, and then wait on {@link #readyForRolling}(see<a name="line.111"></a>
<span class="sourceLineNo">112</span> * {@link #waitForSafePoint()}).&lt;/li&gt;<a name="line.112"></a>
<span class="sourceLineNo">113</span> * &lt;li&gt;In the consumer thread, we will stop polling entries from {@link #waitingConsumePayloads} if<a name="line.113"></a>
<span class="sourceLineNo">114</span> * {@link #waitingRoll} is true, and also stop writing the entries in {@link #toWriteAppends} out.<a name="line.114"></a>
<span class="sourceLineNo">115</span> * &lt;/li&gt;<a name="line.115"></a>
<span class="sourceLineNo">116</span> * &lt;li&gt;If there are unflush data in the writer, sync them.&lt;/li&gt;<a name="line.116"></a>
<span class="sourceLineNo">117</span> * &lt;li&gt;When all out-going sync request is finished, i.e, the {@link #unackedAppends} is empty,<a name="line.117"></a>
<span class="sourceLineNo">118</span> * signal the {@link #readyForRollingCond}.&lt;/li&gt;<a name="line.118"></a>
<span class="sourceLineNo">119</span> * &lt;li&gt;Back to the log roller thread, now we can confirm that there are no out-going entries, i.e.,<a name="line.119"></a>
<span class="sourceLineNo">120</span> * we reach a safe point. So it is safe to replace old writer with new writer now.&lt;/li&gt;<a name="line.120"></a>
<span class="sourceLineNo">121</span> * &lt;li&gt;Set {@link #writerBroken} and {@link #waitingRoll} to false.&lt;/li&gt;<a name="line.121"></a>
<span class="sourceLineNo">122</span> * &lt;li&gt;Schedule the consumer task.&lt;/li&gt;<a name="line.122"></a>
<span class="sourceLineNo">123</span> * &lt;li&gt;Schedule a background task to close the old writer.&lt;/li&gt;<a name="line.123"></a>
<span class="sourceLineNo">124</span> * &lt;/ol&gt;<a name="line.124"></a>
<span class="sourceLineNo">125</span> * For a broken writer roll request, the only difference is that we can bypass the wait for safe<a name="line.125"></a>
<span class="sourceLineNo">126</span> * point stage.<a name="line.126"></a>
<span class="sourceLineNo">127</span> */<a name="line.127"></a>
<span class="sourceLineNo">128</span>@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)<a name="line.128"></a>
<span class="sourceLineNo">129</span>public class AsyncFSWAL extends AbstractFSWAL&lt;AsyncWriter&gt; {<a name="line.129"></a>
<span class="sourceLineNo">130</span><a name="line.130"></a>
<span class="sourceLineNo">131</span> private static final Logger LOG = LoggerFactory.getLogger(AsyncFSWAL.class);<a name="line.131"></a>
<span class="sourceLineNo">132</span><a name="line.132"></a>
<span class="sourceLineNo">133</span> private static final Comparator&lt;SyncFuture&gt; SEQ_COMPARATOR = (o1, o2) -&gt; {<a name="line.133"></a>
<span class="sourceLineNo">134</span> int c = Long.compare(o1.getTxid(), o2.getTxid());<a name="line.134"></a>
<span class="sourceLineNo">135</span> return c != 0 ? c : Integer.compare(System.identityHashCode(o1), System.identityHashCode(o2));<a name="line.135"></a>
<span class="sourceLineNo">136</span> };<a name="line.136"></a>
<span class="sourceLineNo">137</span><a name="line.137"></a>
<span class="sourceLineNo">138</span> public static final String WAL_BATCH_SIZE = "hbase.wal.batch.size";<a name="line.138"></a>
<span class="sourceLineNo">139</span> public static final long DEFAULT_WAL_BATCH_SIZE = 64L * 1024;<a name="line.139"></a>
<span class="sourceLineNo">140</span><a name="line.140"></a>
<span class="sourceLineNo">141</span> public static final String ASYNC_WAL_USE_SHARED_EVENT_LOOP =<a name="line.141"></a>
<span class="sourceLineNo">142</span> "hbase.wal.async.use-shared-event-loop";<a name="line.142"></a>
<span class="sourceLineNo">143</span> public static final boolean DEFAULT_ASYNC_WAL_USE_SHARED_EVENT_LOOP = false;<a name="line.143"></a>
<span class="sourceLineNo">144</span><a name="line.144"></a>
<span class="sourceLineNo">145</span> public static final String ASYNC_WAL_WAIT_ON_SHUTDOWN_IN_SECONDS =<a name="line.145"></a>
<span class="sourceLineNo">146</span> "hbase.wal.async.wait.on.shutdown.seconds";<a name="line.146"></a>
<span class="sourceLineNo">147</span> public static final int DEFAULT_ASYNC_WAL_WAIT_ON_SHUTDOWN_IN_SECONDS = 5;<a name="line.147"></a>
<span class="sourceLineNo">148</span><a name="line.148"></a>
<span class="sourceLineNo">149</span> private final EventLoopGroup eventLoopGroup;<a name="line.149"></a>
<span class="sourceLineNo">150</span><a name="line.150"></a>
<span class="sourceLineNo">151</span> private final ExecutorService consumeExecutor;<a name="line.151"></a>
<span class="sourceLineNo">152</span><a name="line.152"></a>
<span class="sourceLineNo">153</span> private final Class&lt;? extends Channel&gt; channelClass;<a name="line.153"></a>
<span class="sourceLineNo">154</span><a name="line.154"></a>
<span class="sourceLineNo">155</span> private final Lock consumeLock = new ReentrantLock();<a name="line.155"></a>
<span class="sourceLineNo">156</span><a name="line.156"></a>
<span class="sourceLineNo">157</span> private final Runnable consumer = this::consume;<a name="line.157"></a>
<span class="sourceLineNo">158</span><a name="line.158"></a>
<span class="sourceLineNo">159</span> // check if there is already a consumer task in the event loop's task queue<a name="line.159"></a>
<span class="sourceLineNo">160</span> private final Supplier&lt;Boolean&gt; hasConsumerTask;<a name="line.160"></a>
<span class="sourceLineNo">161</span><a name="line.161"></a>
<span class="sourceLineNo">162</span> private static final int MAX_EPOCH = 0x3FFFFFFF;<a name="line.162"></a>
<span class="sourceLineNo">163</span> // the lowest bit is waitingRoll, which means new writer is created and we are waiting for old<a name="line.163"></a>
<span class="sourceLineNo">164</span> // writer to be closed.<a name="line.164"></a>
<span class="sourceLineNo">165</span> // the second lowest bit is writerBorken which means the current writer is broken and rollWriter<a name="line.165"></a>
<span class="sourceLineNo">166</span> // is needed.<a name="line.166"></a>
<span class="sourceLineNo">167</span> // all other bits are the epoch number of the current writer, this is used to detect whether the<a name="line.167"></a>
<span class="sourceLineNo">168</span> // writer is still the one when you issue the sync.<a name="line.168"></a>
<span class="sourceLineNo">169</span> // notice that, modification to this field is only allowed under the protection of consumeLock.<a name="line.169"></a>
<span class="sourceLineNo">170</span> private volatile int epochAndState;<a name="line.170"></a>
<span class="sourceLineNo">171</span><a name="line.171"></a>
<span class="sourceLineNo">172</span> private boolean readyForRolling;<a name="line.172"></a>
<span class="sourceLineNo">173</span><a name="line.173"></a>
<span class="sourceLineNo">174</span> private final Condition readyForRollingCond = consumeLock.newCondition();<a name="line.174"></a>
<span class="sourceLineNo">175</span><a name="line.175"></a>
<span class="sourceLineNo">176</span> private final RingBuffer&lt;RingBufferTruck&gt; waitingConsumePayloads;<a name="line.176"></a>
<span class="sourceLineNo">177</span><a name="line.177"></a>
<span class="sourceLineNo">178</span> private final Sequence waitingConsumePayloadsGatingSequence;<a name="line.178"></a>
<span class="sourceLineNo">179</span><a name="line.179"></a>
<span class="sourceLineNo">180</span> private final AtomicBoolean consumerScheduled = new AtomicBoolean(false);<a name="line.180"></a>
<span class="sourceLineNo">181</span><a name="line.181"></a>
<span class="sourceLineNo">182</span> private final long batchSize;<a name="line.182"></a>
<span class="sourceLineNo">183</span><a name="line.183"></a>
<span class="sourceLineNo">184</span> private final ExecutorService closeExecutor = Executors.newCachedThreadPool(<a name="line.184"></a>
<span class="sourceLineNo">185</span> new ThreadFactoryBuilder().setDaemon(true).setNameFormat("Close-WAL-Writer-%d").build());<a name="line.185"></a>
<span class="sourceLineNo">186</span><a name="line.186"></a>
<span class="sourceLineNo">187</span> private volatile AsyncFSOutput fsOut;<a name="line.187"></a>
<span class="sourceLineNo">188</span><a name="line.188"></a>
<span class="sourceLineNo">189</span> private final Deque&lt;FSWALEntry&gt; toWriteAppends = new ArrayDeque&lt;&gt;();<a name="line.189"></a>
<span class="sourceLineNo">190</span><a name="line.190"></a>
<span class="sourceLineNo">191</span> private final Deque&lt;FSWALEntry&gt; unackedAppends = new ArrayDeque&lt;&gt;();<a name="line.191"></a>
<span class="sourceLineNo">192</span><a name="line.192"></a>
<span class="sourceLineNo">193</span> private final SortedSet&lt;SyncFuture&gt; syncFutures = new TreeSet&lt;&gt;(SEQ_COMPARATOR);<a name="line.193"></a>
<span class="sourceLineNo">194</span><a name="line.194"></a>
<span class="sourceLineNo">195</span> // the highest txid of WAL entries being processed<a name="line.195"></a>
<span class="sourceLineNo">196</span> private long highestProcessedAppendTxid;<a name="line.196"></a>
<span class="sourceLineNo">197</span><a name="line.197"></a>
<span class="sourceLineNo">198</span> // file length when we issue last sync request on the writer<a name="line.198"></a>
<span class="sourceLineNo">199</span> private long fileLengthAtLastSync;<a name="line.199"></a>
<span class="sourceLineNo">200</span><a name="line.200"></a>
<span class="sourceLineNo">201</span> private long highestProcessedAppendTxidAtLastSync;<a name="line.201"></a>
<span class="sourceLineNo">202</span><a name="line.202"></a>
<span class="sourceLineNo">203</span> private final int waitOnShutdownInSeconds;<a name="line.203"></a>
<span class="sourceLineNo">204</span><a name="line.204"></a>
<span class="sourceLineNo">205</span> public AsyncFSWAL(FileSystem fs, Path rootDir, String logDir, String archiveDir,<a name="line.205"></a>
<span class="sourceLineNo">206</span> Configuration conf, List&lt;WALActionsListener&gt; listeners, boolean failIfWALExists,<a name="line.206"></a>
<span class="sourceLineNo">207</span> String prefix, String suffix, EventLoopGroup eventLoopGroup,<a name="line.207"></a>
<span class="sourceLineNo">208</span> Class&lt;? extends Channel&gt; channelClass) throws FailedLogCloseException, IOException {<a name="line.208"></a>
<span class="sourceLineNo">209</span> super(fs, rootDir, logDir, archiveDir, conf, listeners, failIfWALExists, prefix, suffix);<a name="line.209"></a>
<span class="sourceLineNo">210</span> this.eventLoopGroup = eventLoopGroup;<a name="line.210"></a>
<span class="sourceLineNo">211</span> this.channelClass = channelClass;<a name="line.211"></a>
<span class="sourceLineNo">212</span> Supplier&lt;Boolean&gt; hasConsumerTask;<a name="line.212"></a>
<span class="sourceLineNo">213</span> if (conf.getBoolean(ASYNC_WAL_USE_SHARED_EVENT_LOOP, DEFAULT_ASYNC_WAL_USE_SHARED_EVENT_LOOP)) {<a name="line.213"></a>
<span class="sourceLineNo">214</span> this.consumeExecutor = eventLoopGroup.next();<a name="line.214"></a>
<span class="sourceLineNo">215</span> if (consumeExecutor instanceof SingleThreadEventExecutor) {<a name="line.215"></a>
<span class="sourceLineNo">216</span> try {<a name="line.216"></a>
<span class="sourceLineNo">217</span> Field field = SingleThreadEventExecutor.class.getDeclaredField("taskQueue");<a name="line.217"></a>
<span class="sourceLineNo">218</span> field.setAccessible(true);<a name="line.218"></a>
<span class="sourceLineNo">219</span> Queue&lt;?&gt; queue = (Queue&lt;?&gt;) field.get(consumeExecutor);<a name="line.219"></a>
<span class="sourceLineNo">220</span> hasConsumerTask = () -&gt; queue.peek() == consumer;<a name="line.220"></a>
<span class="sourceLineNo">221</span> } catch (Exception e) {<a name="line.221"></a>
<span class="sourceLineNo">222</span> LOG.warn("Can not get task queue of " + consumeExecutor +<a name="line.222"></a>
<span class="sourceLineNo">223</span> ", this is not necessary, just give up", e);<a name="line.223"></a>
<span class="sourceLineNo">224</span> hasConsumerTask = () -&gt; false;<a name="line.224"></a>
<span class="sourceLineNo">225</span> }<a name="line.225"></a>
<span class="sourceLineNo">226</span> } else {<a name="line.226"></a>
<span class="sourceLineNo">227</span> hasConsumerTask = () -&gt; false;<a name="line.227"></a>
<span class="sourceLineNo">228</span> }<a name="line.228"></a>
<span class="sourceLineNo">229</span> } else {<a name="line.229"></a>
<span class="sourceLineNo">230</span> ThreadPoolExecutor threadPool =<a name="line.230"></a>
<span class="sourceLineNo">231</span> new ThreadPoolExecutor(1, 1, 0L,<a name="line.231"></a>
<span class="sourceLineNo">232</span> TimeUnit.MILLISECONDS, new LinkedBlockingQueue&lt;Runnable&gt;(),<a name="line.232"></a>
<span class="sourceLineNo">233</span> new ThreadFactoryBuilder().setNameFormat("AsyncFSWAL-%d-" + rootDir.toString()).<a name="line.233"></a>
<span class="sourceLineNo">234</span> setDaemon(true).build());<a name="line.234"></a>
<span class="sourceLineNo">235</span> hasConsumerTask = () -&gt; threadPool.getQueue().peek() == consumer;<a name="line.235"></a>
<span class="sourceLineNo">236</span> this.consumeExecutor = threadPool;<a name="line.236"></a>
<span class="sourceLineNo">237</span> }<a name="line.237"></a>
<span class="sourceLineNo">238</span><a name="line.238"></a>
<span class="sourceLineNo">239</span> this.hasConsumerTask = hasConsumerTask;<a name="line.239"></a>
<span class="sourceLineNo">240</span> int preallocatedEventCount =<a name="line.240"></a>
<span class="sourceLineNo">241</span> conf.getInt("hbase.regionserver.wal.disruptor.event.count", 1024 * 16);<a name="line.241"></a>
<span class="sourceLineNo">242</span> waitingConsumePayloads =<a name="line.242"></a>
<span class="sourceLineNo">243</span> RingBuffer.createMultiProducer(RingBufferTruck::new, preallocatedEventCount);<a name="line.243"></a>
<span class="sourceLineNo">244</span> waitingConsumePayloadsGatingSequence = new Sequence(Sequencer.INITIAL_CURSOR_VALUE);<a name="line.244"></a>
<span class="sourceLineNo">245</span> waitingConsumePayloads.addGatingSequences(waitingConsumePayloadsGatingSequence);<a name="line.245"></a>
<span class="sourceLineNo">246</span><a name="line.246"></a>
<span class="sourceLineNo">247</span> // inrease the ringbuffer sequence so our txid is start from 1<a name="line.247"></a>
<span class="sourceLineNo">248</span> waitingConsumePayloads.publish(waitingConsumePayloads.next());<a name="line.248"></a>
<span class="sourceLineNo">249</span> waitingConsumePayloadsGatingSequence.set(waitingConsumePayloads.getCursor());<a name="line.249"></a>
<span class="sourceLineNo">250</span><a name="line.250"></a>
<span class="sourceLineNo">251</span> batchSize = conf.getLong(WAL_BATCH_SIZE, DEFAULT_WAL_BATCH_SIZE);<a name="line.251"></a>
<span class="sourceLineNo">252</span> waitOnShutdownInSeconds = conf.getInt(ASYNC_WAL_WAIT_ON_SHUTDOWN_IN_SECONDS,<a name="line.252"></a>
<span class="sourceLineNo">253</span> DEFAULT_ASYNC_WAL_WAIT_ON_SHUTDOWN_IN_SECONDS);<a name="line.253"></a>
<span class="sourceLineNo">254</span> }<a name="line.254"></a>
<span class="sourceLineNo">255</span><a name="line.255"></a>
<span class="sourceLineNo">256</span> private static boolean waitingRoll(int epochAndState) {<a name="line.256"></a>
<span class="sourceLineNo">257</span> return (epochAndState &amp; 1) != 0;<a name="line.257"></a>
<span class="sourceLineNo">258</span> }<a name="line.258"></a>
<span class="sourceLineNo">259</span><a name="line.259"></a>
<span class="sourceLineNo">260</span> private static boolean writerBroken(int epochAndState) {<a name="line.260"></a>
<span class="sourceLineNo">261</span> return ((epochAndState &gt;&gt;&gt; 1) &amp; 1) != 0;<a name="line.261"></a>
<span class="sourceLineNo">262</span> }<a name="line.262"></a>
<span class="sourceLineNo">263</span><a name="line.263"></a>
<span class="sourceLineNo">264</span> private static int epoch(int epochAndState) {<a name="line.264"></a>
<span class="sourceLineNo">265</span> return epochAndState &gt;&gt;&gt; 2;<a name="line.265"></a>
<span class="sourceLineNo">266</span> }<a name="line.266"></a>
<span class="sourceLineNo">267</span><a name="line.267"></a>
<span class="sourceLineNo">268</span> // return whether we have successfully set readyForRolling to true.<a name="line.268"></a>
<span class="sourceLineNo">269</span> private boolean trySetReadyForRolling() {<a name="line.269"></a>
<span class="sourceLineNo">270</span> // Check without holding lock first. Usually we will just return here.<a name="line.270"></a>
<span class="sourceLineNo">271</span> // waitingRoll is volatile and unacedEntries is only accessed inside event loop so it is safe to<a name="line.271"></a>
<span class="sourceLineNo">272</span> // check them outside the consumeLock.<a name="line.272"></a>
<span class="sourceLineNo">273</span> if (!waitingRoll(epochAndState) || !unackedAppends.isEmpty()) {<a name="line.273"></a>
<span class="sourceLineNo">274</span> return false;<a name="line.274"></a>
<span class="sourceLineNo">275</span> }<a name="line.275"></a>
<span class="sourceLineNo">276</span> consumeLock.lock();<a name="line.276"></a>
<span class="sourceLineNo">277</span> try {<a name="line.277"></a>
<span class="sourceLineNo">278</span> // 1. a roll is requested<a name="line.278"></a>
<span class="sourceLineNo">279</span> // 2. all out-going entries have been acked(we have confirmed above).<a name="line.279"></a>
<span class="sourceLineNo">280</span> if (waitingRoll(epochAndState)) {<a name="line.280"></a>
<span class="sourceLineNo">281</span> readyForRolling = true;<a name="line.281"></a>
<span class="sourceLineNo">282</span> readyForRollingCond.signalAll();<a name="line.282"></a>
<span class="sourceLineNo">283</span> return true;<a name="line.283"></a>
<span class="sourceLineNo">284</span> } else {<a name="line.284"></a>
<span class="sourceLineNo">285</span> return false;<a name="line.285"></a>
<span class="sourceLineNo">286</span> }<a name="line.286"></a>
<span class="sourceLineNo">287</span> } finally {<a name="line.287"></a>
<span class="sourceLineNo">288</span> consumeLock.unlock();<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><a name="line.291"></a>
<span class="sourceLineNo">292</span> private void syncFailed(long epochWhenSync, Throwable error) {<a name="line.292"></a>
<span class="sourceLineNo">293</span> LOG.warn("sync failed", error);<a name="line.293"></a>
<span class="sourceLineNo">294</span> boolean shouldRequestLogRoll = true;<a name="line.294"></a>
<span class="sourceLineNo">295</span> consumeLock.lock();<a name="line.295"></a>
<span class="sourceLineNo">296</span> try {<a name="line.296"></a>
<span class="sourceLineNo">297</span> int currentEpochAndState = epochAndState;<a name="line.297"></a>
<span class="sourceLineNo">298</span> if (epoch(currentEpochAndState) != epochWhenSync || writerBroken(currentEpochAndState)) {<a name="line.298"></a>
<span class="sourceLineNo">299</span> // this is not the previous writer which means we have already rolled the writer.<a name="line.299"></a>
<span class="sourceLineNo">300</span> // or this is still the current writer, but we have already marked it as broken and request<a name="line.300"></a>
<span class="sourceLineNo">301</span> // a roll.<a name="line.301"></a>
<span class="sourceLineNo">302</span> return;<a name="line.302"></a>
<span class="sourceLineNo">303</span> }<a name="line.303"></a>
<span class="sourceLineNo">304</span> this.epochAndState = currentEpochAndState | 0b10;<a name="line.304"></a>
<span class="sourceLineNo">305</span> if (waitingRoll(currentEpochAndState)) {<a name="line.305"></a>
<span class="sourceLineNo">306</span> readyForRolling = true;<a name="line.306"></a>
<span class="sourceLineNo">307</span> readyForRollingCond.signalAll();<a name="line.307"></a>
<span class="sourceLineNo">308</span> // this means we have already in the middle of a rollWriter so just tell the roller thread<a name="line.308"></a>
<span class="sourceLineNo">309</span> // that you can continue without requesting an extra log roll.<a name="line.309"></a>
<span class="sourceLineNo">310</span> shouldRequestLogRoll = false;<a name="line.310"></a>
<span class="sourceLineNo">311</span> }<a name="line.311"></a>
<span class="sourceLineNo">312</span> } finally {<a name="line.312"></a>
<span class="sourceLineNo">313</span> consumeLock.unlock();<a name="line.313"></a>
<span class="sourceLineNo">314</span> }<a name="line.314"></a>
<span class="sourceLineNo">315</span> for (Iterator&lt;FSWALEntry&gt; iter = unackedAppends.descendingIterator(); iter.hasNext();) {<a name="line.315"></a>
<span class="sourceLineNo">316</span> toWriteAppends.addFirst(iter.next());<a name="line.316"></a>
<span class="sourceLineNo">317</span> }<a name="line.317"></a>
<span class="sourceLineNo">318</span> highestUnsyncedTxid = highestSyncedTxid.get();<a name="line.318"></a>
<span class="sourceLineNo">319</span> if (shouldRequestLogRoll) {<a name="line.319"></a>
<span class="sourceLineNo">320</span> // request a roll.<a name="line.320"></a>
<span class="sourceLineNo">321</span> requestLogRoll(ERROR);<a name="line.321"></a>
<span class="sourceLineNo">322</span> }<a name="line.322"></a>
<span class="sourceLineNo">323</span> }<a name="line.323"></a>
<span class="sourceLineNo">324</span><a name="line.324"></a>
<span class="sourceLineNo">325</span> private void syncCompleted(AsyncWriter writer, long processedTxid, long startTimeNs) {<a name="line.325"></a>
<span class="sourceLineNo">326</span> highestSyncedTxid.set(processedTxid);<a name="line.326"></a>
<span class="sourceLineNo">327</span> for (Iterator&lt;FSWALEntry&gt; iter = unackedAppends.iterator(); iter.hasNext();) {<a name="line.327"></a>
<span class="sourceLineNo">328</span> FSWALEntry entry = iter.next();<a name="line.328"></a>
<span class="sourceLineNo">329</span> if (entry.getTxid() &lt;= processedTxid) {<a name="line.329"></a>
<span class="sourceLineNo">330</span> entry.release();<a name="line.330"></a>
<span class="sourceLineNo">331</span> iter.remove();<a name="line.331"></a>
<span class="sourceLineNo">332</span> } else {<a name="line.332"></a>
<span class="sourceLineNo">333</span> break;<a name="line.333"></a>
<span class="sourceLineNo">334</span> }<a name="line.334"></a>
<span class="sourceLineNo">335</span> }<a name="line.335"></a>
<span class="sourceLineNo">336</span> postSync(System.nanoTime() - startTimeNs, finishSync(true));<a name="line.336"></a>
<span class="sourceLineNo">337</span> if (trySetReadyForRolling()) {<a name="line.337"></a>
<span class="sourceLineNo">338</span> // we have just finished a roll, then do not need to check for log rolling, the writer will be<a name="line.338"></a>
<span class="sourceLineNo">339</span> // closed soon.<a name="line.339"></a>
<span class="sourceLineNo">340</span> return;<a name="line.340"></a>
<span class="sourceLineNo">341</span> }<a name="line.341"></a>
<span class="sourceLineNo">342</span> // If we haven't already requested a roll, check if we have exceeded logrollsize<a name="line.342"></a>
<span class="sourceLineNo">343</span> if (!isLogRollRequested() &amp;&amp; writer.getLength() &gt; logrollsize) {<a name="line.343"></a>
<span class="sourceLineNo">344</span> if (LOG.isDebugEnabled()) {<a name="line.344"></a>
<span class="sourceLineNo">345</span> LOG.debug("Requesting log roll because of file size threshold; length=" +<a name="line.345"></a>
<span class="sourceLineNo">346</span> writer.getLength() + ", logrollsize=" + logrollsize);<a name="line.346"></a>
<span class="sourceLineNo">347</span> }<a name="line.347"></a>
<span class="sourceLineNo">348</span> requestLogRoll(SIZE);<a name="line.348"></a>
<span class="sourceLineNo">349</span> }<a name="line.349"></a>
<span class="sourceLineNo">350</span> }<a name="line.350"></a>
<span class="sourceLineNo">351</span><a name="line.351"></a>
<span class="sourceLineNo">352</span> // find all the sync futures between these two txids to see if we need to issue a hsync, if no<a name="line.352"></a>
<span class="sourceLineNo">353</span> // sync futures then just use the default one.<a name="line.353"></a>
<span class="sourceLineNo">354</span> private boolean isHsync(long beginTxid, long endTxid) {<a name="line.354"></a>
<span class="sourceLineNo">355</span> SortedSet&lt;SyncFuture&gt; futures =<a name="line.355"></a>
<span class="sourceLineNo">356</span> syncFutures.subSet(new SyncFuture().reset(beginTxid), new SyncFuture().reset(endTxid + 1));<a name="line.356"></a>
<span class="sourceLineNo">357</span> if (futures.isEmpty()) {<a name="line.357"></a>
<span class="sourceLineNo">358</span> return useHsync;<a name="line.358"></a>
<span class="sourceLineNo">359</span> }<a name="line.359"></a>
<span class="sourceLineNo">360</span> for (SyncFuture future : futures) {<a name="line.360"></a>
<span class="sourceLineNo">361</span> if (future.isForceSync()) {<a name="line.361"></a>
<span class="sourceLineNo">362</span> return true;<a name="line.362"></a>
<span class="sourceLineNo">363</span> }<a name="line.363"></a>
<span class="sourceLineNo">364</span> }<a name="line.364"></a>
<span class="sourceLineNo">365</span> return false;<a name="line.365"></a>
<span class="sourceLineNo">366</span> }<a name="line.366"></a>
<span class="sourceLineNo">367</span><a name="line.367"></a>
<span class="sourceLineNo">368</span> private void sync(AsyncWriter writer) {<a name="line.368"></a>
<span class="sourceLineNo">369</span> fileLengthAtLastSync = writer.getLength();<a name="line.369"></a>
<span class="sourceLineNo">370</span> long currentHighestProcessedAppendTxid = highestProcessedAppendTxid;<a name="line.370"></a>
<span class="sourceLineNo">371</span> boolean shouldUseHsync =<a name="line.371"></a>
<span class="sourceLineNo">372</span> isHsync(highestProcessedAppendTxidAtLastSync, currentHighestProcessedAppendTxid);<a name="line.372"></a>
<span class="sourceLineNo">373</span> highestProcessedAppendTxidAtLastSync = currentHighestProcessedAppendTxid;<a name="line.373"></a>
<span class="sourceLineNo">374</span> final long startTimeNs = System.nanoTime();<a name="line.374"></a>
<span class="sourceLineNo">375</span> final long epoch = (long) epochAndState &gt;&gt;&gt; 2L;<a name="line.375"></a>
<span class="sourceLineNo">376</span> addListener(writer.sync(shouldUseHsync), (result, error) -&gt; {<a name="line.376"></a>
<span class="sourceLineNo">377</span> if (error != null) {<a name="line.377"></a>
<span class="sourceLineNo">378</span> syncFailed(epoch, error);<a name="line.378"></a>
<span class="sourceLineNo">379</span> } else {<a name="line.379"></a>
<span class="sourceLineNo">380</span> syncCompleted(writer, currentHighestProcessedAppendTxid, startTimeNs);<a name="line.380"></a>
<span class="sourceLineNo">381</span> }<a name="line.381"></a>
<span class="sourceLineNo">382</span> }, consumeExecutor);<a name="line.382"></a>
<span class="sourceLineNo">383</span> }<a name="line.383"></a>
<span class="sourceLineNo">384</span><a name="line.384"></a>
<span class="sourceLineNo">385</span> private void addTimeAnnotation(SyncFuture future, String annotation) {<a name="line.385"></a>
<span class="sourceLineNo">386</span> TraceUtil.addTimelineAnnotation(annotation);<a name="line.386"></a>
<span class="sourceLineNo">387</span> // TODO handle htrace API change, see HBASE-18895<a name="line.387"></a>
<span class="sourceLineNo">388</span> // future.setSpan(scope.getSpan());<a name="line.388"></a>
<span class="sourceLineNo">389</span> }<a name="line.389"></a>
<span class="sourceLineNo">390</span><a name="line.390"></a>
<span class="sourceLineNo">391</span> private int finishSyncLowerThanTxid(long txid, boolean addSyncTrace) {<a name="line.391"></a>
<span class="sourceLineNo">392</span> int finished = 0;<a name="line.392"></a>
<span class="sourceLineNo">393</span> for (Iterator&lt;SyncFuture&gt; iter = syncFutures.iterator(); iter.hasNext();) {<a name="line.393"></a>
<span class="sourceLineNo">394</span> SyncFuture sync = iter.next();<a name="line.394"></a>
<span class="sourceLineNo">395</span> if (sync.getTxid() &lt;= txid) {<a name="line.395"></a>
<span class="sourceLineNo">396</span> sync.done(txid, null);<a name="line.396"></a>
<span class="sourceLineNo">397</span> iter.remove();<a name="line.397"></a>
<span class="sourceLineNo">398</span> finished++;<a name="line.398"></a>
<span class="sourceLineNo">399</span> if (addSyncTrace) {<a name="line.399"></a>
<span class="sourceLineNo">400</span> addTimeAnnotation(sync, "writer synced");<a name="line.400"></a>
<span class="sourceLineNo">401</span> }<a name="line.401"></a>
<span class="sourceLineNo">402</span> } else {<a name="line.402"></a>
<span class="sourceLineNo">403</span> break;<a name="line.403"></a>
<span class="sourceLineNo">404</span> }<a name="line.404"></a>
<span class="sourceLineNo">405</span> }<a name="line.405"></a>
<span class="sourceLineNo">406</span> return finished;<a name="line.406"></a>
<span class="sourceLineNo">407</span> }<a name="line.407"></a>
<span class="sourceLineNo">408</span><a name="line.408"></a>
<span class="sourceLineNo">409</span> // try advancing the highestSyncedTxid as much as possible<a name="line.409"></a>
<span class="sourceLineNo">410</span> private int finishSync(boolean addSyncTrace) {<a name="line.410"></a>
<span class="sourceLineNo">411</span> if (unackedAppends.isEmpty()) {<a name="line.411"></a>
<span class="sourceLineNo">412</span> // All outstanding appends have been acked.<a name="line.412"></a>
<span class="sourceLineNo">413</span> if (toWriteAppends.isEmpty()) {<a name="line.413"></a>
<span class="sourceLineNo">414</span> // Also no appends that wait to be written out, then just finished all pending syncs.<a name="line.414"></a>
<span class="sourceLineNo">415</span> long maxSyncTxid = highestSyncedTxid.get();<a name="line.415"></a>
<span class="sourceLineNo">416</span> for (SyncFuture sync : syncFutures) {<a name="line.416"></a>
<span class="sourceLineNo">417</span> maxSyncTxid = Math.max(maxSyncTxid, sync.getTxid());<a name="line.417"></a>
<span class="sourceLineNo">418</span> sync.done(maxSyncTxid, null);<a name="line.418"></a>
<span class="sourceLineNo">419</span> if (addSyncTrace) {<a name="line.419"></a>
<span class="sourceLineNo">420</span> addTimeAnnotation(sync, "writer synced");<a name="line.420"></a>
<span class="sourceLineNo">421</span> }<a name="line.421"></a>
<span class="sourceLineNo">422</span> }<a name="line.422"></a>
<span class="sourceLineNo">423</span> highestSyncedTxid.set(maxSyncTxid);<a name="line.423"></a>
<span class="sourceLineNo">424</span> int finished = syncFutures.size();<a name="line.424"></a>
<span class="sourceLineNo">425</span> syncFutures.clear();<a name="line.425"></a>
<span class="sourceLineNo">426</span> return finished;<a name="line.426"></a>
<span class="sourceLineNo">427</span> } else {<a name="line.427"></a>
<span class="sourceLineNo">428</span> // There is no append between highestProcessedAppendTxid and lowestUnprocessedAppendTxid, so<a name="line.428"></a>
<span class="sourceLineNo">429</span> // if highestSyncedTxid &gt;= highestProcessedAppendTxid, then all syncs whose txid are between<a name="line.429"></a>
<span class="sourceLineNo">430</span> // highestProcessedAppendTxid and lowestUnprocessedAppendTxid can be finished.<a name="line.430"></a>
<span class="sourceLineNo">431</span> long lowestUnprocessedAppendTxid = toWriteAppends.peek().getTxid();<a name="line.431"></a>
<span class="sourceLineNo">432</span> assert lowestUnprocessedAppendTxid &gt; highestProcessedAppendTxid;<a name="line.432"></a>
<span class="sourceLineNo">433</span> long doneTxid = lowestUnprocessedAppendTxid - 1;<a name="line.433"></a>
<span class="sourceLineNo">434</span> highestSyncedTxid.set(doneTxid);<a name="line.434"></a>
<span class="sourceLineNo">435</span> return finishSyncLowerThanTxid(doneTxid, addSyncTrace);<a name="line.435"></a>
<span class="sourceLineNo">436</span> }<a name="line.436"></a>
<span class="sourceLineNo">437</span> } else {<a name="line.437"></a>
<span class="sourceLineNo">438</span> // There are still unacked appends. So let's move the highestSyncedTxid to the txid of the<a name="line.438"></a>
<span class="sourceLineNo">439</span> // first unacked append minus 1.<a name="line.439"></a>
<span class="sourceLineNo">440</span> long lowestUnackedAppendTxid = unackedAppends.peek().getTxid();<a name="line.440"></a>
<span class="sourceLineNo">441</span> long doneTxid = Math.max(lowestUnackedAppendTxid - 1, highestSyncedTxid.get());<a name="line.441"></a>
<span class="sourceLineNo">442</span> highestSyncedTxid.set(doneTxid);<a name="line.442"></a>
<span class="sourceLineNo">443</span> return finishSyncLowerThanTxid(doneTxid, addSyncTrace);<a name="line.443"></a>
<span class="sourceLineNo">444</span> }<a name="line.444"></a>
<span class="sourceLineNo">445</span> }<a name="line.445"></a>
<span class="sourceLineNo">446</span><a name="line.446"></a>
<span class="sourceLineNo">447</span> private void appendAndSync() {<a name="line.447"></a>
<span class="sourceLineNo">448</span> final AsyncWriter writer = this.writer;<a name="line.448"></a>
<span class="sourceLineNo">449</span> // maybe a sync request is not queued when we issue a sync, so check here to see if we could<a name="line.449"></a>
<span class="sourceLineNo">450</span> // finish some.<a name="line.450"></a>
<span class="sourceLineNo">451</span> finishSync(false);<a name="line.451"></a>
<span class="sourceLineNo">452</span> long newHighestProcessedAppendTxid = -1L;<a name="line.452"></a>
<span class="sourceLineNo">453</span> for (Iterator&lt;FSWALEntry&gt; iter = toWriteAppends.iterator(); iter.hasNext();) {<a name="line.453"></a>
<span class="sourceLineNo">454</span> FSWALEntry entry = iter.next();<a name="line.454"></a>
<span class="sourceLineNo">455</span> boolean appended;<a name="line.455"></a>
<span class="sourceLineNo">456</span> try {<a name="line.456"></a>
<span class="sourceLineNo">457</span> appended = appendEntry(writer, entry);<a name="line.457"></a>
<span class="sourceLineNo">458</span> } catch (IOException e) {<a name="line.458"></a>
<span class="sourceLineNo">459</span> throw new AssertionError("should not happen", e);<a name="line.459"></a>
<span class="sourceLineNo">460</span> }<a name="line.460"></a>
<span class="sourceLineNo">461</span> newHighestProcessedAppendTxid = entry.getTxid();<a name="line.461"></a>
<span class="sourceLineNo">462</span> iter.remove();<a name="line.462"></a>
<span class="sourceLineNo">463</span> if (appended) {<a name="line.463"></a>
<span class="sourceLineNo">464</span> // This is possible, when we fail to sync, we will add the unackedAppends back to<a name="line.464"></a>
<span class="sourceLineNo">465</span> // toWriteAppends, so here we may get an entry which is already in the unackedAppends.<a name="line.465"></a>
<span class="sourceLineNo">466</span> if (unackedAppends.isEmpty() || unackedAppends.peekLast().getTxid() &lt; entry.getTxid()) {<a name="line.466"></a>
<span class="sourceLineNo">467</span> unackedAppends.addLast(entry);<a name="line.467"></a>
<span class="sourceLineNo">468</span> }<a name="line.468"></a>
<span class="sourceLineNo">469</span> if (writer.getLength() - fileLengthAtLastSync &gt;= batchSize) {<a name="line.469"></a>
<span class="sourceLineNo">470</span> break;<a name="line.470"></a>
<span class="sourceLineNo">471</span> }<a name="line.471"></a>
<span class="sourceLineNo">472</span> }<a name="line.472"></a>
<span class="sourceLineNo">473</span> }<a name="line.473"></a>
<span class="sourceLineNo">474</span> // if we have a newer transaction id, update it.<a name="line.474"></a>
<span class="sourceLineNo">475</span> // otherwise, use the previous transaction id.<a name="line.475"></a>
<span class="sourceLineNo">476</span> if (newHighestProcessedAppendTxid &gt; 0) {<a name="line.476"></a>
<span class="sourceLineNo">477</span> highestProcessedAppendTxid = newHighestProcessedAppendTxid;<a name="line.477"></a>
<span class="sourceLineNo">478</span> } else {<a name="line.478"></a>
<span class="sourceLineNo">479</span> newHighestProcessedAppendTxid = highestProcessedAppendTxid;<a name="line.479"></a>
<span class="sourceLineNo">480</span> }<a name="line.480"></a>
<span class="sourceLineNo">481</span><a name="line.481"></a>
<span class="sourceLineNo">482</span> if (writer.getLength() - fileLengthAtLastSync &gt;= batchSize) {<a name="line.482"></a>
<span class="sourceLineNo">483</span> // sync because buffer size limit.<a name="line.483"></a>
<span class="sourceLineNo">484</span> sync(writer);<a name="line.484"></a>
<span class="sourceLineNo">485</span> return;<a name="line.485"></a>
<span class="sourceLineNo">486</span> }<a name="line.486"></a>
<span class="sourceLineNo">487</span> if (writer.getLength() == fileLengthAtLastSync) {<a name="line.487"></a>
<span class="sourceLineNo">488</span> // we haven't written anything out, just advance the highestSyncedSequence since we may only<a name="line.488"></a>
<span class="sourceLineNo">489</span> // stamped some region sequence id.<a name="line.489"></a>
<span class="sourceLineNo">490</span> if (unackedAppends.isEmpty()) {<a name="line.490"></a>
<span class="sourceLineNo">491</span> highestSyncedTxid.set(highestProcessedAppendTxid);<a name="line.491"></a>
<span class="sourceLineNo">492</span> finishSync(false);<a name="line.492"></a>
<span class="sourceLineNo">493</span> trySetReadyForRolling();<a name="line.493"></a>
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<span class="sourceLineNo">495</span> return;<a name="line.495"></a>
<span class="sourceLineNo">496</span> }<a name="line.496"></a>
<span class="sourceLineNo">497</span> // reach here means that we have some unsynced data but haven't reached the batch size yet<a name="line.497"></a>
<span class="sourceLineNo">498</span> // but we will not issue a sync directly here even if there are sync requests because we may<a name="line.498"></a>
<span class="sourceLineNo">499</span> // have some new data in the ringbuffer, so let's just return here and delay the decision of<a name="line.499"></a>
<span class="sourceLineNo">500</span> // whether to issue a sync in the caller method.<a name="line.500"></a>
<span class="sourceLineNo">501</span> }<a name="line.501"></a>
<span class="sourceLineNo">502</span><a name="line.502"></a>
<span class="sourceLineNo">503</span> private void drainNonMarkerEditsAndFailSyncs() {<a name="line.503"></a>
<span class="sourceLineNo">504</span> if (toWriteAppends.isEmpty()) {<a name="line.504"></a>
<span class="sourceLineNo">505</span> return;<a name="line.505"></a>
<span class="sourceLineNo">506</span> }<a name="line.506"></a>
<span class="sourceLineNo">507</span> boolean hasNonMarkerEdits = false;<a name="line.507"></a>
<span class="sourceLineNo">508</span> Iterator&lt;FSWALEntry&gt; iter = toWriteAppends.descendingIterator();<a name="line.508"></a>
<span class="sourceLineNo">509</span> while (iter.hasNext()) {<a name="line.509"></a>
<span class="sourceLineNo">510</span> FSWALEntry entry = iter.next();<a name="line.510"></a>
<span class="sourceLineNo">511</span> if (!entry.getEdit().isMetaEdit()) {<a name="line.511"></a>
<span class="sourceLineNo">512</span> entry.release();<a name="line.512"></a>
<span class="sourceLineNo">513</span> hasNonMarkerEdits = true;<a name="line.513"></a>
<span class="sourceLineNo">514</span> break;<a name="line.514"></a>
<span class="sourceLineNo">515</span> }<a name="line.515"></a>
<span class="sourceLineNo">516</span> }<a name="line.516"></a>
<span class="sourceLineNo">517</span> if (hasNonMarkerEdits) {<a name="line.517"></a>
<span class="sourceLineNo">518</span> for (;;) {<a name="line.518"></a>
<span class="sourceLineNo">519</span> iter.remove();<a name="line.519"></a>
<span class="sourceLineNo">520</span> if (!iter.hasNext()) {<a name="line.520"></a>
<span class="sourceLineNo">521</span> break;<a name="line.521"></a>
<span class="sourceLineNo">522</span> }<a name="line.522"></a>
<span class="sourceLineNo">523</span> iter.next().release();<a name="line.523"></a>
<span class="sourceLineNo">524</span> }<a name="line.524"></a>
<span class="sourceLineNo">525</span> for (FSWALEntry entry : unackedAppends) {<a name="line.525"></a>
<span class="sourceLineNo">526</span> entry.release();<a name="line.526"></a>
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<span class="sourceLineNo">528</span> unackedAppends.clear();<a name="line.528"></a>
<span class="sourceLineNo">529</span> // fail the sync futures which are under the txid of the first remaining edit, if none, fail<a name="line.529"></a>
<span class="sourceLineNo">530</span> // all the sync futures.<a name="line.530"></a>
<span class="sourceLineNo">531</span> long txid = toWriteAppends.isEmpty() ? Long.MAX_VALUE : toWriteAppends.peek().getTxid();<a name="line.531"></a>
<span class="sourceLineNo">532</span> IOException error = new IOException("WAL is closing, only marker edit is allowed");<a name="line.532"></a>
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<span class="sourceLineNo">534</span> SyncFuture future = syncIter.next();<a name="line.534"></a>
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<span class="sourceLineNo">536</span> future.done(future.getTxid(), error);<a name="line.536"></a>
<span class="sourceLineNo">537</span> syncIter.remove();<a name="line.537"></a>
<span class="sourceLineNo">538</span> } else {<a name="line.538"></a>
<span class="sourceLineNo">539</span> break;<a name="line.539"></a>
<span class="sourceLineNo">540</span> }<a name="line.540"></a>
<span class="sourceLineNo">541</span> }<a name="line.541"></a>
<span class="sourceLineNo">542</span> }<a name="line.542"></a>
<span class="sourceLineNo">543</span> }<a name="line.543"></a>
<span class="sourceLineNo">544</span><a name="line.544"></a>
<span class="sourceLineNo">545</span> private void consume() {<a name="line.545"></a>
<span class="sourceLineNo">546</span> consumeLock.lock();<a name="line.546"></a>
<span class="sourceLineNo">547</span> try {<a name="line.547"></a>
<span class="sourceLineNo">548</span> int currentEpochAndState = epochAndState;<a name="line.548"></a>
<span class="sourceLineNo">549</span> if (writerBroken(currentEpochAndState)) {<a name="line.549"></a>
<span class="sourceLineNo">550</span> return;<a name="line.550"></a>
<span class="sourceLineNo">551</span> }<a name="line.551"></a>
<span class="sourceLineNo">552</span> if (waitingRoll(currentEpochAndState)) {<a name="line.552"></a>
<span class="sourceLineNo">553</span> if (writer.getLength() &gt; fileLengthAtLastSync) {<a name="line.553"></a>
<span class="sourceLineNo">554</span> // issue a sync<a name="line.554"></a>
<span class="sourceLineNo">555</span> sync(writer);<a name="line.555"></a>
<span class="sourceLineNo">556</span> } else {<a name="line.556"></a>
<span class="sourceLineNo">557</span> if (unackedAppends.isEmpty()) {<a name="line.557"></a>
<span class="sourceLineNo">558</span> readyForRolling = true;<a name="line.558"></a>
<span class="sourceLineNo">559</span> readyForRollingCond.signalAll();<a name="line.559"></a>
<span class="sourceLineNo">560</span> }<a name="line.560"></a>
<span class="sourceLineNo">561</span> }<a name="line.561"></a>
<span class="sourceLineNo">562</span> return;<a name="line.562"></a>
<span class="sourceLineNo">563</span> }<a name="line.563"></a>
<span class="sourceLineNo">564</span> } finally {<a name="line.564"></a>
<span class="sourceLineNo">565</span> consumeLock.unlock();<a name="line.565"></a>
<span class="sourceLineNo">566</span> }<a name="line.566"></a>
<span class="sourceLineNo">567</span> long nextCursor = waitingConsumePayloadsGatingSequence.get() + 1;<a name="line.567"></a>
<span class="sourceLineNo">568</span> for (long cursorBound = waitingConsumePayloads.getCursor(); nextCursor &lt;= cursorBound;<a name="line.568"></a>
<span class="sourceLineNo">569</span> nextCursor++) {<a name="line.569"></a>
<span class="sourceLineNo">570</span> if (!waitingConsumePayloads.isPublished(nextCursor)) {<a name="line.570"></a>
<span class="sourceLineNo">571</span> break;<a name="line.571"></a>
<span class="sourceLineNo">572</span> }<a name="line.572"></a>
<span class="sourceLineNo">573</span> RingBufferTruck truck = waitingConsumePayloads.get(nextCursor);<a name="line.573"></a>
<span class="sourceLineNo">574</span> switch (truck.type()) {<a name="line.574"></a>
<span class="sourceLineNo">575</span> case APPEND:<a name="line.575"></a>
<span class="sourceLineNo">576</span> toWriteAppends.addLast(truck.unloadAppend());<a name="line.576"></a>
<span class="sourceLineNo">577</span> break;<a name="line.577"></a>
<span class="sourceLineNo">578</span> case SYNC:<a name="line.578"></a>
<span class="sourceLineNo">579</span> syncFutures.add(truck.unloadSync());<a name="line.579"></a>
<span class="sourceLineNo">580</span> break;<a name="line.580"></a>
<span class="sourceLineNo">581</span> default:<a name="line.581"></a>
<span class="sourceLineNo">582</span> LOG.warn("RingBufferTruck with unexpected type: " + truck.type());<a name="line.582"></a>
<span class="sourceLineNo">583</span> break;<a name="line.583"></a>
<span class="sourceLineNo">584</span> }<a name="line.584"></a>
<span class="sourceLineNo">585</span> waitingConsumePayloadsGatingSequence.set(nextCursor);<a name="line.585"></a>
<span class="sourceLineNo">586</span> }<a name="line.586"></a>
<span class="sourceLineNo">587</span> if (markerEditOnly()) {<a name="line.587"></a>
<span class="sourceLineNo">588</span> drainNonMarkerEditsAndFailSyncs();<a name="line.588"></a>
<span class="sourceLineNo">589</span> }<a name="line.589"></a>
<span class="sourceLineNo">590</span> appendAndSync();<a name="line.590"></a>
<span class="sourceLineNo">591</span> if (hasConsumerTask.get()) {<a name="line.591"></a>
<span class="sourceLineNo">592</span> return;<a name="line.592"></a>
<span class="sourceLineNo">593</span> }<a name="line.593"></a>
<span class="sourceLineNo">594</span> if (toWriteAppends.isEmpty()) {<a name="line.594"></a>
<span class="sourceLineNo">595</span> if (waitingConsumePayloadsGatingSequence.get() == waitingConsumePayloads.getCursor()) {<a name="line.595"></a>
<span class="sourceLineNo">596</span> consumerScheduled.set(false);<a name="line.596"></a>
<span class="sourceLineNo">597</span> // recheck here since in append and sync we do not hold the consumeLock. Thing may<a name="line.597"></a>
<span class="sourceLineNo">598</span> // happen like<a name="line.598"></a>
<span class="sourceLineNo">599</span> // 1. we check cursor, no new entry<a name="line.599"></a>
<span class="sourceLineNo">600</span> // 2. someone publishes a new entry to ringbuffer and the consumerScheduled is true and<a name="line.600"></a>
<span class="sourceLineNo">601</span> // give up scheduling the consumer task.<a name="line.601"></a>
<span class="sourceLineNo">602</span> // 3. we set consumerScheduled to false and also give up scheduling consumer task.<a name="line.602"></a>
<span class="sourceLineNo">603</span> if (waitingConsumePayloadsGatingSequence.get() == waitingConsumePayloads.getCursor()) {<a name="line.603"></a>
<span class="sourceLineNo">604</span> // we will give up consuming so if there are some unsynced data we need to issue a sync.<a name="line.604"></a>
<span class="sourceLineNo">605</span> if (writer.getLength() &gt; fileLengthAtLastSync &amp;&amp; !syncFutures.isEmpty() &amp;&amp;<a name="line.605"></a>
<span class="sourceLineNo">606</span> syncFutures.last().getTxid() &gt; highestProcessedAppendTxidAtLastSync) {<a name="line.606"></a>
<span class="sourceLineNo">607</span> // no new data in the ringbuffer and we have at least one sync request<a name="line.607"></a>
<span class="sourceLineNo">608</span> sync(writer);<a name="line.608"></a>
<span class="sourceLineNo">609</span> }<a name="line.609"></a>
<span class="sourceLineNo">610</span> return;<a name="line.610"></a>
<span class="sourceLineNo">611</span> } else {<a name="line.611"></a>
<span class="sourceLineNo">612</span> // maybe someone has grabbed this before us<a name="line.612"></a>
<span class="sourceLineNo">613</span> if (!consumerScheduled.compareAndSet(false, true)) {<a name="line.613"></a>
<span class="sourceLineNo">614</span> return;<a name="line.614"></a>
<span class="sourceLineNo">615</span> }<a name="line.615"></a>
<span class="sourceLineNo">616</span> }<a name="line.616"></a>
<span class="sourceLineNo">617</span> }<a name="line.617"></a>
<span class="sourceLineNo">618</span> }<a name="line.618"></a>
<span class="sourceLineNo">619</span> // reschedule if we still have something to write.<a name="line.619"></a>
<span class="sourceLineNo">620</span> consumeExecutor.execute(consumer);<a name="line.620"></a>
<span class="sourceLineNo">621</span> }<a name="line.621"></a>
<span class="sourceLineNo">622</span><a name="line.622"></a>
<span class="sourceLineNo">623</span> private boolean shouldScheduleConsumer() {<a name="line.623"></a>
<span class="sourceLineNo">624</span> int currentEpochAndState = epochAndState;<a name="line.624"></a>
<span class="sourceLineNo">625</span> if (writerBroken(currentEpochAndState) || waitingRoll(currentEpochAndState)) {<a name="line.625"></a>
<span class="sourceLineNo">626</span> return false;<a name="line.626"></a>
<span class="sourceLineNo">627</span> }<a name="line.627"></a>
<span class="sourceLineNo">628</span> return consumerScheduled.compareAndSet(false, true);<a name="line.628"></a>
<span class="sourceLineNo">629</span> }<a name="line.629"></a>
<span class="sourceLineNo">630</span><a name="line.630"></a>
<span class="sourceLineNo">631</span> // This is used by sync replication, where we are going to close the wal soon after we reopen all<a name="line.631"></a>
<span class="sourceLineNo">632</span> // the regions. Will be overridden by sub classes.<a name="line.632"></a>
<span class="sourceLineNo">633</span> protected boolean markerEditOnly() {<a name="line.633"></a>
<span class="sourceLineNo">634</span> return false;<a name="line.634"></a>
<span class="sourceLineNo">635</span> }<a name="line.635"></a>
<span class="sourceLineNo">636</span><a name="line.636"></a>
<span class="sourceLineNo">637</span> @Override<a name="line.637"></a>
<span class="sourceLineNo">638</span> protected long append(RegionInfo hri, WALKeyImpl key, WALEdit edits, boolean inMemstore)<a name="line.638"></a>
<span class="sourceLineNo">639</span> throws IOException {<a name="line.639"></a>
<span class="sourceLineNo">640</span> if (markerEditOnly() &amp;&amp; !edits.isMetaEdit()) {<a name="line.640"></a>
<span class="sourceLineNo">641</span> throw new IOException("WAL is closing, only marker edit is allowed");<a name="line.641"></a>
<span class="sourceLineNo">642</span> }<a name="line.642"></a>
<span class="sourceLineNo">643</span> long txid = stampSequenceIdAndPublishToRingBuffer(hri, key, edits, inMemstore,<a name="line.643"></a>
<span class="sourceLineNo">644</span> waitingConsumePayloads);<a name="line.644"></a>
<span class="sourceLineNo">645</span> if (shouldScheduleConsumer()) {<a name="line.645"></a>
<span class="sourceLineNo">646</span> consumeExecutor.execute(consumer);<a name="line.646"></a>
<span class="sourceLineNo">647</span> }<a name="line.647"></a>
<span class="sourceLineNo">648</span> return txid;<a name="line.648"></a>
<span class="sourceLineNo">649</span> }<a name="line.649"></a>
<span class="sourceLineNo">650</span><a name="line.650"></a>
<span class="sourceLineNo">651</span> @Override<a name="line.651"></a>
<span class="sourceLineNo">652</span> public void sync() throws IOException {<a name="line.652"></a>
<span class="sourceLineNo">653</span> sync(useHsync);<a name="line.653"></a>
<span class="sourceLineNo">654</span> }<a name="line.654"></a>
<span class="sourceLineNo">655</span><a name="line.655"></a>
<span class="sourceLineNo">656</span> @Override<a name="line.656"></a>
<span class="sourceLineNo">657</span> public void sync(long txid) throws IOException {<a name="line.657"></a>
<span class="sourceLineNo">658</span> sync(txid, useHsync);<a name="line.658"></a>
<span class="sourceLineNo">659</span> }<a name="line.659"></a>
<span class="sourceLineNo">660</span><a name="line.660"></a>
<span class="sourceLineNo">661</span> @Override<a name="line.661"></a>
<span class="sourceLineNo">662</span> public void sync(boolean forceSync) throws IOException {<a name="line.662"></a>
<span class="sourceLineNo">663</span> try (TraceScope scope = TraceUtil.createTrace("AsyncFSWAL.sync")) {<a name="line.663"></a>
<span class="sourceLineNo">664</span> long txid = waitingConsumePayloads.next();<a name="line.664"></a>
<span class="sourceLineNo">665</span> SyncFuture future;<a name="line.665"></a>
<span class="sourceLineNo">666</span> try {<a name="line.666"></a>
<span class="sourceLineNo">667</span> future = getSyncFuture(txid, forceSync);<a name="line.667"></a>
<span class="sourceLineNo">668</span> RingBufferTruck truck = waitingConsumePayloads.get(txid);<a name="line.668"></a>
<span class="sourceLineNo">669</span> truck.load(future);<a name="line.669"></a>
<span class="sourceLineNo">670</span> } finally {<a name="line.670"></a>
<span class="sourceLineNo">671</span> waitingConsumePayloads.publish(txid);<a name="line.671"></a>
<span class="sourceLineNo">672</span> }<a name="line.672"></a>
<span class="sourceLineNo">673</span> if (shouldScheduleConsumer()) {<a name="line.673"></a>
<span class="sourceLineNo">674</span> consumeExecutor.execute(consumer);<a name="line.674"></a>
<span class="sourceLineNo">675</span> }<a name="line.675"></a>
<span class="sourceLineNo">676</span> blockOnSync(future);<a name="line.676"></a>
<span class="sourceLineNo">677</span> }<a name="line.677"></a>
<span class="sourceLineNo">678</span> }<a name="line.678"></a>
<span class="sourceLineNo">679</span><a name="line.679"></a>
<span class="sourceLineNo">680</span> @Override<a name="line.680"></a>
<span class="sourceLineNo">681</span> public void sync(long txid, boolean forceSync) throws IOException {<a name="line.681"></a>
<span class="sourceLineNo">682</span> if (highestSyncedTxid.get() &gt;= txid) {<a name="line.682"></a>
<span class="sourceLineNo">683</span> return;<a name="line.683"></a>
<span class="sourceLineNo">684</span> }<a name="line.684"></a>
<span class="sourceLineNo">685</span> try (TraceScope scope = TraceUtil.createTrace("AsyncFSWAL.sync")) {<a name="line.685"></a>
<span class="sourceLineNo">686</span> // here we do not use ring buffer sequence as txid<a name="line.686"></a>
<span class="sourceLineNo">687</span> long sequence = waitingConsumePayloads.next();<a name="line.687"></a>
<span class="sourceLineNo">688</span> SyncFuture future;<a name="line.688"></a>
<span class="sourceLineNo">689</span> try {<a name="line.689"></a>
<span class="sourceLineNo">690</span> future = getSyncFuture(txid, forceSync);<a name="line.690"></a>
<span class="sourceLineNo">691</span> RingBufferTruck truck = waitingConsumePayloads.get(sequence);<a name="line.691"></a>
<span class="sourceLineNo">692</span> truck.load(future);<a name="line.692"></a>
<span class="sourceLineNo">693</span> } finally {<a name="line.693"></a>
<span class="sourceLineNo">694</span> waitingConsumePayloads.publish(sequence);<a name="line.694"></a>
<span class="sourceLineNo">695</span> }<a name="line.695"></a>
<span class="sourceLineNo">696</span> if (shouldScheduleConsumer()) {<a name="line.696"></a>
<span class="sourceLineNo">697</span> consumeExecutor.execute(consumer);<a name="line.697"></a>
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<span class="sourceLineNo">699</span> blockOnSync(future);<a name="line.699"></a>
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<span class="sourceLineNo">701</span> }<a name="line.701"></a>
<span class="sourceLineNo">702</span><a name="line.702"></a>
<span class="sourceLineNo">703</span> protected final AsyncWriter createAsyncWriter(FileSystem fs, Path path) throws IOException {<a name="line.703"></a>
<span class="sourceLineNo">704</span> return AsyncFSWALProvider.createAsyncWriter(conf, fs, path, false, this.blocksize,<a name="line.704"></a>
<span class="sourceLineNo">705</span> eventLoopGroup, channelClass);<a name="line.705"></a>
<span class="sourceLineNo">706</span> }<a name="line.706"></a>
<span class="sourceLineNo">707</span><a name="line.707"></a>
<span class="sourceLineNo">708</span> @Override<a name="line.708"></a>
<span class="sourceLineNo">709</span> protected AsyncWriter createWriterInstance(Path path) throws IOException {<a name="line.709"></a>
<span class="sourceLineNo">710</span> return createAsyncWriter(fs, path);<a name="line.710"></a>
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<span class="sourceLineNo">712</span><a name="line.712"></a>
<span class="sourceLineNo">713</span> private void waitForSafePoint() {<a name="line.713"></a>
<span class="sourceLineNo">714</span> consumeLock.lock();<a name="line.714"></a>
<span class="sourceLineNo">715</span> try {<a name="line.715"></a>
<span class="sourceLineNo">716</span> int currentEpochAndState = epochAndState;<a name="line.716"></a>
<span class="sourceLineNo">717</span> if (writerBroken(currentEpochAndState) || this.writer == null) {<a name="line.717"></a>
<span class="sourceLineNo">718</span> return;<a name="line.718"></a>
<span class="sourceLineNo">719</span> }<a name="line.719"></a>
<span class="sourceLineNo">720</span> consumerScheduled.set(true);<a name="line.720"></a>
<span class="sourceLineNo">721</span> epochAndState = currentEpochAndState | 1;<a name="line.721"></a>
<span class="sourceLineNo">722</span> readyForRolling = false;<a name="line.722"></a>
<span class="sourceLineNo">723</span> consumeExecutor.execute(consumer);<a name="line.723"></a>
<span class="sourceLineNo">724</span> while (!readyForRolling) {<a name="line.724"></a>
<span class="sourceLineNo">725</span> readyForRollingCond.awaitUninterruptibly();<a name="line.725"></a>
<span class="sourceLineNo">726</span> }<a name="line.726"></a>
<span class="sourceLineNo">727</span> } finally {<a name="line.727"></a>
<span class="sourceLineNo">728</span> consumeLock.unlock();<a name="line.728"></a>
<span class="sourceLineNo">729</span> }<a name="line.729"></a>
<span class="sourceLineNo">730</span> }<a name="line.730"></a>
<span class="sourceLineNo">731</span><a name="line.731"></a>
<span class="sourceLineNo">732</span> protected final long closeWriter(AsyncWriter writer) {<a name="line.732"></a>
<span class="sourceLineNo">733</span> if (writer != null) {<a name="line.733"></a>
<span class="sourceLineNo">734</span> long fileLength = writer.getLength();<a name="line.734"></a>
<span class="sourceLineNo">735</span> closeExecutor.execute(() -&gt; {<a name="line.735"></a>
<span class="sourceLineNo">736</span> try {<a name="line.736"></a>
<span class="sourceLineNo">737</span> writer.close();<a name="line.737"></a>
<span class="sourceLineNo">738</span> } catch (IOException e) {<a name="line.738"></a>
<span class="sourceLineNo">739</span> LOG.warn("close old writer failed", e);<a name="line.739"></a>
<span class="sourceLineNo">740</span> }<a name="line.740"></a>
<span class="sourceLineNo">741</span> });<a name="line.741"></a>
<span class="sourceLineNo">742</span> return fileLength;<a name="line.742"></a>
<span class="sourceLineNo">743</span> } else {<a name="line.743"></a>
<span class="sourceLineNo">744</span> return 0L;<a name="line.744"></a>
<span class="sourceLineNo">745</span> }<a name="line.745"></a>
<span class="sourceLineNo">746</span> }<a name="line.746"></a>
<span class="sourceLineNo">747</span><a name="line.747"></a>
<span class="sourceLineNo">748</span> @Override<a name="line.748"></a>
<span class="sourceLineNo">749</span> protected void doReplaceWriter(Path oldPath, Path newPath, AsyncWriter nextWriter)<a name="line.749"></a>
<span class="sourceLineNo">750</span> throws IOException {<a name="line.750"></a>
<span class="sourceLineNo">751</span> Preconditions.checkNotNull(nextWriter);<a name="line.751"></a>
<span class="sourceLineNo">752</span> waitForSafePoint();<a name="line.752"></a>
<span class="sourceLineNo">753</span> long oldFileLen = closeWriter(this.writer);<a name="line.753"></a>
<span class="sourceLineNo">754</span> logRollAndSetupWalProps(oldPath, newPath, oldFileLen);<a name="line.754"></a>
<span class="sourceLineNo">755</span> this.writer = nextWriter;<a name="line.755"></a>
<span class="sourceLineNo">756</span> if (nextWriter instanceof AsyncProtobufLogWriter) {<a name="line.756"></a>
<span class="sourceLineNo">757</span> this.fsOut = ((AsyncProtobufLogWriter) nextWriter).getOutput();<a name="line.757"></a>
<span class="sourceLineNo">758</span> }<a name="line.758"></a>
<span class="sourceLineNo">759</span> this.fileLengthAtLastSync = nextWriter.getLength();<a name="line.759"></a>
<span class="sourceLineNo">760</span> this.highestProcessedAppendTxidAtLastSync = 0L;<a name="line.760"></a>
<span class="sourceLineNo">761</span> consumeLock.lock();<a name="line.761"></a>
<span class="sourceLineNo">762</span> try {<a name="line.762"></a>
<span class="sourceLineNo">763</span> consumerScheduled.set(true);<a name="line.763"></a>
<span class="sourceLineNo">764</span> int currentEpoch = epochAndState &gt;&gt;&gt; 2;<a name="line.764"></a>
<span class="sourceLineNo">765</span> int nextEpoch = currentEpoch == MAX_EPOCH ? 0 : currentEpoch + 1;<a name="line.765"></a>
<span class="sourceLineNo">766</span> // set a new epoch and also clear waitingRoll and writerBroken<a name="line.766"></a>
<span class="sourceLineNo">767</span> this.epochAndState = nextEpoch &lt;&lt; 2;<a name="line.767"></a>
<span class="sourceLineNo">768</span> // Reset rollRequested status<a name="line.768"></a>
<span class="sourceLineNo">769</span> rollRequested.set(false);<a name="line.769"></a>
<span class="sourceLineNo">770</span> consumeExecutor.execute(consumer);<a name="line.770"></a>
<span class="sourceLineNo">771</span> } finally {<a name="line.771"></a>
<span class="sourceLineNo">772</span> consumeLock.unlock();<a name="line.772"></a>
<span class="sourceLineNo">773</span> }<a name="line.773"></a>
<span class="sourceLineNo">774</span> }<a name="line.774"></a>
<span class="sourceLineNo">775</span><a name="line.775"></a>
<span class="sourceLineNo">776</span> @Override<a name="line.776"></a>
<span class="sourceLineNo">777</span> protected void doShutdown() throws IOException {<a name="line.777"></a>
<span class="sourceLineNo">778</span> waitForSafePoint();<a name="line.778"></a>
<span class="sourceLineNo">779</span> closeWriter(this.writer);<a name="line.779"></a>
<span class="sourceLineNo">780</span> this.writer = null;<a name="line.780"></a>
<span class="sourceLineNo">781</span> closeExecutor.shutdown();<a name="line.781"></a>
<span class="sourceLineNo">782</span> try {<a name="line.782"></a>
<span class="sourceLineNo">783</span> if (!closeExecutor.awaitTermination(waitOnShutdownInSeconds, TimeUnit.SECONDS)) {<a name="line.783"></a>
<span class="sourceLineNo">784</span> LOG.error("We have waited " + waitOnShutdownInSeconds + " seconds but" +<a name="line.784"></a>
<span class="sourceLineNo">785</span> " the close of async writer doesn't complete." +<a name="line.785"></a>
<span class="sourceLineNo">786</span> "Please check the status of underlying filesystem" +<a name="line.786"></a>
<span class="sourceLineNo">787</span> " or increase the wait time by the config \"" + ASYNC_WAL_WAIT_ON_SHUTDOWN_IN_SECONDS +<a name="line.787"></a>
<span class="sourceLineNo">788</span> "\"");<a name="line.788"></a>
<span class="sourceLineNo">789</span> }<a name="line.789"></a>
<span class="sourceLineNo">790</span> } catch (InterruptedException e) {<a name="line.790"></a>
<span class="sourceLineNo">791</span> LOG.error("The wait for close of async writer is interrupted");<a name="line.791"></a>
<span class="sourceLineNo">792</span> Thread.currentThread().interrupt();<a name="line.792"></a>
<span class="sourceLineNo">793</span> }<a name="line.793"></a>
<span class="sourceLineNo">794</span> IOException error = new IOException("WAL has been closed");<a name="line.794"></a>
<span class="sourceLineNo">795</span> long nextCursor = waitingConsumePayloadsGatingSequence.get() + 1;<a name="line.795"></a>
<span class="sourceLineNo">796</span> // drain all the pending sync requests<a name="line.796"></a>
<span class="sourceLineNo">797</span> for (long cursorBound = waitingConsumePayloads.getCursor(); nextCursor &lt;= cursorBound;<a name="line.797"></a>
<span class="sourceLineNo">798</span> nextCursor++) {<a name="line.798"></a>
<span class="sourceLineNo">799</span> if (!waitingConsumePayloads.isPublished(nextCursor)) {<a name="line.799"></a>
<span class="sourceLineNo">800</span> break;<a name="line.800"></a>
<span class="sourceLineNo">801</span> }<a name="line.801"></a>
<span class="sourceLineNo">802</span> RingBufferTruck truck = waitingConsumePayloads.get(nextCursor);<a name="line.802"></a>
<span class="sourceLineNo">803</span> switch (truck.type()) {<a name="line.803"></a>
<span class="sourceLineNo">804</span> case SYNC:<a name="line.804"></a>
<span class="sourceLineNo">805</span> syncFutures.add(truck.unloadSync());<a name="line.805"></a>
<span class="sourceLineNo">806</span> break;<a name="line.806"></a>
<span class="sourceLineNo">807</span> default:<a name="line.807"></a>
<span class="sourceLineNo">808</span> break;<a name="line.808"></a>
<span class="sourceLineNo">809</span> }<a name="line.809"></a>
<span class="sourceLineNo">810</span> }<a name="line.810"></a>
<span class="sourceLineNo">811</span> // and fail them<a name="line.811"></a>
<span class="sourceLineNo">812</span> syncFutures.forEach(f -&gt; f.done(f.getTxid(), error));<a name="line.812"></a>
<span class="sourceLineNo">813</span> if (!(consumeExecutor instanceof EventLoop)) {<a name="line.813"></a>
<span class="sourceLineNo">814</span> consumeExecutor.shutdown();<a name="line.814"></a>
<span class="sourceLineNo">815</span> }<a name="line.815"></a>
<span class="sourceLineNo">816</span> }<a name="line.816"></a>
<span class="sourceLineNo">817</span><a name="line.817"></a>
<span class="sourceLineNo">818</span> @Override<a name="line.818"></a>
<span class="sourceLineNo">819</span> protected void doAppend(AsyncWriter writer, FSWALEntry entry) {<a name="line.819"></a>
<span class="sourceLineNo">820</span> writer.append(entry);<a name="line.820"></a>
<span class="sourceLineNo">821</span> }<a name="line.821"></a>
<span class="sourceLineNo">822</span><a name="line.822"></a>
<span class="sourceLineNo">823</span> @Override<a name="line.823"></a>
<span class="sourceLineNo">824</span> DatanodeInfo[] getPipeline() {<a name="line.824"></a>
<span class="sourceLineNo">825</span> AsyncFSOutput output = this.fsOut;<a name="line.825"></a>
<span class="sourceLineNo">826</span> return output != null ? output.getPipeline() : new DatanodeInfo[0];<a name="line.826"></a>
<span class="sourceLineNo">827</span> }<a name="line.827"></a>
<span class="sourceLineNo">828</span><a name="line.828"></a>
<span class="sourceLineNo">829</span> @Override<a name="line.829"></a>
<span class="sourceLineNo">830</span> int getLogReplication() {<a name="line.830"></a>
<span class="sourceLineNo">831</span> return getPipeline().length;<a name="line.831"></a>
<span class="sourceLineNo">832</span> }<a name="line.832"></a>
<span class="sourceLineNo">833</span><a name="line.833"></a>
<span class="sourceLineNo">834</span> @Override<a name="line.834"></a>
<span class="sourceLineNo">835</span> protected boolean doCheckLogLowReplication() {<a name="line.835"></a>
<span class="sourceLineNo">836</span> // not like FSHLog, AsyncFSOutput will fail immediately if there are errors writing to DNs, so<a name="line.836"></a>
<span class="sourceLineNo">837</span> // typically there is no 'low replication' state, only a 'broken' state.<a name="line.837"></a>
<span class="sourceLineNo">838</span> AsyncFSOutput output = this.fsOut;<a name="line.838"></a>
<span class="sourceLineNo">839</span> return output != null &amp;&amp; output.isBroken();<a name="line.839"></a>
<span class="sourceLineNo">840</span> }<a name="line.840"></a>
<span class="sourceLineNo">841</span>}<a name="line.841"></a>
</pre>
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