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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.LOW_REPLICATION;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import static org.apache.hadoop.hbase.regionserver.wal.WALActionsListener.RollRequestReason.SIZE;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import static org.apache.hadoop.hbase.regionserver.wal.WALActionsListener.RollRequestReason.SLOW_SYNC;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span><a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import com.lmax.disruptor.BlockingWaitStrategy;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import com.lmax.disruptor.EventHandler;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>import com.lmax.disruptor.ExceptionHandler;<a name="line.27"></a> |
| <span class="sourceLineNo">028</span>import com.lmax.disruptor.LifecycleAware;<a name="line.28"></a> |
| <span class="sourceLineNo">029</span>import com.lmax.disruptor.TimeoutException;<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>import com.lmax.disruptor.dsl.Disruptor;<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>import com.lmax.disruptor.dsl.ProducerType;<a name="line.31"></a> |
| <span class="sourceLineNo">032</span>import java.io.IOException;<a name="line.32"></a> |
| <span class="sourceLineNo">033</span>import java.io.OutputStream;<a name="line.33"></a> |
| <span class="sourceLineNo">034</span>import java.util.Arrays;<a name="line.34"></a> |
| <span class="sourceLineNo">035</span>import java.util.List;<a name="line.35"></a> |
| <span class="sourceLineNo">036</span>import java.util.concurrent.BlockingQueue;<a name="line.36"></a> |
| <span class="sourceLineNo">037</span>import java.util.concurrent.CountDownLatch;<a name="line.37"></a> |
| <span class="sourceLineNo">038</span>import java.util.concurrent.ExecutorService;<a name="line.38"></a> |
| <span class="sourceLineNo">039</span>import java.util.concurrent.Executors;<a name="line.39"></a> |
| <span class="sourceLineNo">040</span>import java.util.concurrent.LinkedBlockingQueue;<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.AtomicInteger;<a name="line.42"></a> |
| <span class="sourceLineNo">043</span>import org.apache.hadoop.conf.Configuration;<a name="line.43"></a> |
| <span class="sourceLineNo">044</span>import org.apache.hadoop.fs.FSDataOutputStream;<a name="line.44"></a> |
| <span class="sourceLineNo">045</span>import org.apache.hadoop.fs.FileSystem;<a name="line.45"></a> |
| <span class="sourceLineNo">046</span>import org.apache.hadoop.fs.Path;<a name="line.46"></a> |
| <span class="sourceLineNo">047</span>import org.apache.hadoop.hbase.HConstants;<a name="line.47"></a> |
| <span class="sourceLineNo">048</span>import org.apache.hadoop.hbase.client.RegionInfo;<a name="line.48"></a> |
| <span class="sourceLineNo">049</span>import org.apache.hadoop.hbase.trace.TraceUtil;<a name="line.49"></a> |
| <span class="sourceLineNo">050</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.50"></a> |
| <span class="sourceLineNo">051</span>import org.apache.hadoop.hbase.util.ClassSize;<a name="line.51"></a> |
| <span class="sourceLineNo">052</span>import org.apache.hadoop.hbase.util.CommonFSUtils;<a name="line.52"></a> |
| <span class="sourceLineNo">053</span>import org.apache.hadoop.hbase.util.Threads;<a name="line.53"></a> |
| <span class="sourceLineNo">054</span>import org.apache.hadoop.hbase.wal.FSHLogProvider;<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.Writer;<a name="line.57"></a> |
| <span class="sourceLineNo">058</span>import org.apache.hadoop.hdfs.DFSOutputStream;<a name="line.58"></a> |
| <span class="sourceLineNo">059</span>import org.apache.hadoop.hdfs.client.HdfsDataOutputStream;<a name="line.59"></a> |
| <span class="sourceLineNo">060</span>import org.apache.hadoop.hdfs.protocol.DatanodeInfo;<a name="line.60"></a> |
| <span class="sourceLineNo">061</span>import org.apache.htrace.core.TraceScope;<a name="line.61"></a> |
| <span class="sourceLineNo">062</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.62"></a> |
| <span class="sourceLineNo">063</span>import org.slf4j.Logger;<a name="line.63"></a> |
| <span class="sourceLineNo">064</span>import org.slf4j.LoggerFactory;<a name="line.64"></a> |
| <span class="sourceLineNo">065</span><a name="line.65"></a> |
| <span class="sourceLineNo">066</span>import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;<a name="line.66"></a> |
| <span class="sourceLineNo">067</span>import org.apache.hbase.thirdparty.com.google.common.util.concurrent.ThreadFactoryBuilder;<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> * The default implementation of FSWAL.<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> */<a name="line.71"></a> |
| <span class="sourceLineNo">072</span>@InterfaceAudience.Private<a name="line.72"></a> |
| <span class="sourceLineNo">073</span>public class FSHLog extends AbstractFSWAL<Writer> {<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> // IMPLEMENTATION NOTES:<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> //<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> // At the core is a ring buffer. Our ring buffer is the LMAX Disruptor. It tries to<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> // minimize synchronizations and volatile writes when multiple contending threads as is the case<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> // here appending and syncing on a single WAL. The Disruptor is configured to handle multiple<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> // producers but it has one consumer only (the producers in HBase are IPC Handlers calling append<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> // and then sync). The single consumer/writer pulls the appends and syncs off the ring buffer.<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> // When a handler calls sync, it is given back a future. The producer 'blocks' on the future so<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> // it does not return until the sync completes. The future is passed over the ring buffer from<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> // the producer/handler to the consumer thread where it does its best to batch up the producer<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> // syncs so one WAL sync actually spans multiple producer sync invocations. How well the<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> // batching works depends on the write rate; i.e. we tend to batch more in times of<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> // high writes/syncs.<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> //<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> // Calls to append now also wait until the append has been done on the consumer side of the<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> // disruptor. We used to not wait but it makes the implementation easier to grok if we have<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> // the region edit/sequence id after the append returns.<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> //<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> // TODO: Handlers need to coordinate appending AND syncing. Can we have the threads contend<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> // once only? Probably hard given syncs take way longer than an append.<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> //<a name="line.94"></a> |
| <span class="sourceLineNo">095</span> // The consumer threads pass the syncs off to multiple syncing threads in a round robin fashion<a name="line.95"></a> |
| <span class="sourceLineNo">096</span> // to ensure we keep up back-to-back FS sync calls (FS sync calls are the long poll writing the<a name="line.96"></a> |
| <span class="sourceLineNo">097</span> // WAL). The consumer thread passes the futures to the sync threads for it to complete<a name="line.97"></a> |
| <span class="sourceLineNo">098</span> // the futures when done.<a name="line.98"></a> |
| <span class="sourceLineNo">099</span> //<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> // The 'sequence' in the below is the sequence of the append/sync on the ringbuffer. It<a name="line.100"></a> |
| <span class="sourceLineNo">101</span> // acts as a sort-of transaction id. It is always incrementing.<a name="line.101"></a> |
| <span class="sourceLineNo">102</span> //<a name="line.102"></a> |
| <span class="sourceLineNo">103</span> // The RingBufferEventHandler class hosts the ring buffer consuming code. The threads that<a name="line.103"></a> |
| <span class="sourceLineNo">104</span> // do the actual FS sync are implementations of SyncRunner. SafePointZigZagLatch is a<a name="line.104"></a> |
| <span class="sourceLineNo">105</span> // synchronization class used to halt the consumer at a safe point -- just after all outstanding<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> // syncs and appends have completed -- so the log roller can swap the WAL out under it.<a name="line.106"></a> |
| <span class="sourceLineNo">107</span> //<a name="line.107"></a> |
| <span class="sourceLineNo">108</span> // We use ring buffer sequence as txid of FSWALEntry and SyncFuture.<a name="line.108"></a> |
| <span class="sourceLineNo">109</span> private static final Logger LOG = LoggerFactory.getLogger(FSHLog.class);<a name="line.109"></a> |
| <span class="sourceLineNo">110</span><a name="line.110"></a> |
| <span class="sourceLineNo">111</span> private static final String TOLERABLE_LOW_REPLICATION = "hbase.regionserver.hlog.tolerable.lowreplication";<a name="line.111"></a> |
| <span class="sourceLineNo">112</span> private static final String LOW_REPLICATION_ROLL_LIMIT = "hbase.regionserver.hlog.lowreplication.rolllimit";<a name="line.112"></a> |
| <span class="sourceLineNo">113</span> private static final int DEFAULT_LOW_REPLICATION_ROLL_LIMIT = 5;<a name="line.113"></a> |
| <span class="sourceLineNo">114</span> private static final String ROLL_ERRORS_TOLERATED = "hbase.regionserver.logroll.errors.tolerated";<a name="line.114"></a> |
| <span class="sourceLineNo">115</span> private static final int DEFAULT_ROLL_ERRORS_TOLERATED = 2;<a name="line.115"></a> |
| <span class="sourceLineNo">116</span> private static final String SYNCER_COUNT = "hbase.regionserver.hlog.syncer.count";<a name="line.116"></a> |
| <span class="sourceLineNo">117</span> private static final int DEFAULT_SYNCER_COUNT = 5;<a name="line.117"></a> |
| <span class="sourceLineNo">118</span> private static final String MAX_BATCH_COUNT = "hbase.regionserver.wal.sync.batch.count";<a name="line.118"></a> |
| <span class="sourceLineNo">119</span> private static final int DEFAULT_MAX_BATCH_COUNT = 200;<a name="line.119"></a> |
| <span class="sourceLineNo">120</span><a name="line.120"></a> |
| <span class="sourceLineNo">121</span> private static final String FSHLOG_WAIT_ON_SHUTDOWN_IN_SECONDS = "hbase.wal.fshlog.wait.on.shutdown.seconds";<a name="line.121"></a> |
| <span class="sourceLineNo">122</span> private static final int DEFAULT_FSHLOG_WAIT_ON_SHUTDOWN_IN_SECONDS = 5;<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> * The nexus at which all incoming handlers meet. Does appends and sync with an ordering. Appends<a name="line.125"></a> |
| <span class="sourceLineNo">126</span> * and syncs are each put on the ring which means handlers need to smash up against the ring twice<a name="line.126"></a> |
| <span class="sourceLineNo">127</span> * (can we make it once only? ... maybe not since time to append is so different from time to sync<a name="line.127"></a> |
| <span class="sourceLineNo">128</span> * and sometimes we don't want to sync or we want to async the sync). The ring is where we make<a name="line.128"></a> |
| <span class="sourceLineNo">129</span> * sure of our ordering and it is also where we do batching up of handler sync calls.<a name="line.129"></a> |
| <span class="sourceLineNo">130</span> */<a name="line.130"></a> |
| <span class="sourceLineNo">131</span> private final Disruptor<RingBufferTruck> disruptor;<a name="line.131"></a> |
| <span class="sourceLineNo">132</span><a name="line.132"></a> |
| <span class="sourceLineNo">133</span> /**<a name="line.133"></a> |
| <span class="sourceLineNo">134</span> * This fellow is run by the above appendExecutor service but it is all about batching up appends<a name="line.134"></a> |
| <span class="sourceLineNo">135</span> * and syncs; it may shutdown without cleaning out the last few appends or syncs. To guard against<a name="line.135"></a> |
| <span class="sourceLineNo">136</span> * this, keep a reference to this handler and do explicit close on way out to make sure all<a name="line.136"></a> |
| <span class="sourceLineNo">137</span> * flushed out before we exit.<a name="line.137"></a> |
| <span class="sourceLineNo">138</span> */<a name="line.138"></a> |
| <span class="sourceLineNo">139</span> private final RingBufferEventHandler ringBufferEventHandler;<a name="line.139"></a> |
| <span class="sourceLineNo">140</span><a name="line.140"></a> |
| <span class="sourceLineNo">141</span> /**<a name="line.141"></a> |
| <span class="sourceLineNo">142</span> * FSDataOutputStream associated with the current SequenceFile.writer<a name="line.142"></a> |
| <span class="sourceLineNo">143</span> */<a name="line.143"></a> |
| <span class="sourceLineNo">144</span> private FSDataOutputStream hdfs_out;<a name="line.144"></a> |
| <span class="sourceLineNo">145</span><a name="line.145"></a> |
| <span class="sourceLineNo">146</span> // All about log rolling if not enough replicas outstanding.<a name="line.146"></a> |
| <span class="sourceLineNo">147</span><a name="line.147"></a> |
| <span class="sourceLineNo">148</span> // Minimum tolerable replicas, if the actual value is lower than it, rollWriter will be triggered<a name="line.148"></a> |
| <span class="sourceLineNo">149</span> private final int minTolerableReplication;<a name="line.149"></a> |
| <span class="sourceLineNo">150</span><a name="line.150"></a> |
| <span class="sourceLineNo">151</span> // If live datanode count is lower than the default replicas value,<a name="line.151"></a> |
| <span class="sourceLineNo">152</span> // RollWriter will be triggered in each sync(So the RollWriter will be<a name="line.152"></a> |
| <span class="sourceLineNo">153</span> // triggered one by one in a short time). Using it as a workaround to slow<a name="line.153"></a> |
| <span class="sourceLineNo">154</span> // down the roll frequency triggered by checkLowReplication().<a name="line.154"></a> |
| <span class="sourceLineNo">155</span> private final AtomicInteger consecutiveLogRolls = new AtomicInteger(0);<a name="line.155"></a> |
| <span class="sourceLineNo">156</span><a name="line.156"></a> |
| <span class="sourceLineNo">157</span> private final int lowReplicationRollLimit;<a name="line.157"></a> |
| <span class="sourceLineNo">158</span><a name="line.158"></a> |
| <span class="sourceLineNo">159</span> // If consecutiveLogRolls is larger than lowReplicationRollLimit,<a name="line.159"></a> |
| <span class="sourceLineNo">160</span> // then disable the rolling in checkLowReplication().<a name="line.160"></a> |
| <span class="sourceLineNo">161</span> // Enable it if the replications recover.<a name="line.161"></a> |
| <span class="sourceLineNo">162</span> private volatile boolean lowReplicationRollEnabled = true;<a name="line.162"></a> |
| <span class="sourceLineNo">163</span><a name="line.163"></a> |
| <span class="sourceLineNo">164</span> /** Number of log close errors tolerated before we abort */<a name="line.164"></a> |
| <span class="sourceLineNo">165</span> private final int closeErrorsTolerated;<a name="line.165"></a> |
| <span class="sourceLineNo">166</span><a name="line.166"></a> |
| <span class="sourceLineNo">167</span> private final AtomicInteger closeErrorCount = new AtomicInteger();<a name="line.167"></a> |
| <span class="sourceLineNo">168</span><a name="line.168"></a> |
| <span class="sourceLineNo">169</span> private final int waitOnShutdownInSeconds;<a name="line.169"></a> |
| <span class="sourceLineNo">170</span> private final ExecutorService closeExecutor = Executors.newCachedThreadPool(<a name="line.170"></a> |
| <span class="sourceLineNo">171</span> new ThreadFactoryBuilder().setDaemon(true).setNameFormat("Close-WAL-Writer-%d").build());<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> * Exception handler to pass the disruptor ringbuffer. Same as native implementation only it logs<a name="line.174"></a> |
| <span class="sourceLineNo">175</span> * using our logger instead of java native logger.<a name="line.175"></a> |
| <span class="sourceLineNo">176</span> */<a name="line.176"></a> |
| <span class="sourceLineNo">177</span> static class RingBufferExceptionHandler implements ExceptionHandler<RingBufferTruck> {<a name="line.177"></a> |
| <span class="sourceLineNo">178</span><a name="line.178"></a> |
| <span class="sourceLineNo">179</span> @Override<a name="line.179"></a> |
| <span class="sourceLineNo">180</span> public void handleEventException(Throwable ex, long sequence, RingBufferTruck event) {<a name="line.180"></a> |
| <span class="sourceLineNo">181</span> LOG.error("Sequence=" + sequence + ", event=" + event, ex);<a name="line.181"></a> |
| <span class="sourceLineNo">182</span> throw new RuntimeException(ex);<a name="line.182"></a> |
| <span class="sourceLineNo">183</span> }<a name="line.183"></a> |
| <span class="sourceLineNo">184</span><a name="line.184"></a> |
| <span class="sourceLineNo">185</span> @Override<a name="line.185"></a> |
| <span class="sourceLineNo">186</span> public void handleOnStartException(Throwable ex) {<a name="line.186"></a> |
| <span class="sourceLineNo">187</span> LOG.error(ex.toString(), ex);<a name="line.187"></a> |
| <span class="sourceLineNo">188</span> throw new RuntimeException(ex);<a name="line.188"></a> |
| <span class="sourceLineNo">189</span> }<a name="line.189"></a> |
| <span class="sourceLineNo">190</span><a name="line.190"></a> |
| <span class="sourceLineNo">191</span> @Override<a name="line.191"></a> |
| <span class="sourceLineNo">192</span> public void handleOnShutdownException(Throwable ex) {<a name="line.192"></a> |
| <span class="sourceLineNo">193</span> LOG.error(ex.toString(), ex);<a name="line.193"></a> |
| <span class="sourceLineNo">194</span> throw new RuntimeException(ex);<a name="line.194"></a> |
| <span class="sourceLineNo">195</span> }<a name="line.195"></a> |
| <span class="sourceLineNo">196</span> }<a name="line.196"></a> |
| <span class="sourceLineNo">197</span><a name="line.197"></a> |
| <span class="sourceLineNo">198</span> /**<a name="line.198"></a> |
| <span class="sourceLineNo">199</span> * Constructor.<a name="line.199"></a> |
| <span class="sourceLineNo">200</span> * @param fs filesystem handle<a name="line.200"></a> |
| <span class="sourceLineNo">201</span> * @param root path for stored and archived wals<a name="line.201"></a> |
| <span class="sourceLineNo">202</span> * @param logDir dir where wals are stored<a name="line.202"></a> |
| <span class="sourceLineNo">203</span> * @param conf configuration to use<a name="line.203"></a> |
| <span class="sourceLineNo">204</span> */<a name="line.204"></a> |
| <span class="sourceLineNo">205</span> @VisibleForTesting<a name="line.205"></a> |
| <span class="sourceLineNo">206</span> public FSHLog(final FileSystem fs, final Path root, final String logDir, final Configuration conf)<a name="line.206"></a> |
| <span class="sourceLineNo">207</span> throws IOException {<a name="line.207"></a> |
| <span class="sourceLineNo">208</span> this(fs, root, logDir, HConstants.HREGION_OLDLOGDIR_NAME, conf, null, true, null, null);<a name="line.208"></a> |
| <span class="sourceLineNo">209</span> }<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> * Create an edit log at the given <code>dir</code> location. You should never have to load an<a name="line.212"></a> |
| <span class="sourceLineNo">213</span> * existing log. If there is a log at startup, it should have already been processed and deleted<a name="line.213"></a> |
| <span class="sourceLineNo">214</span> * by the time the WAL object is started up.<a name="line.214"></a> |
| <span class="sourceLineNo">215</span> * @param fs filesystem handle<a name="line.215"></a> |
| <span class="sourceLineNo">216</span> * @param rootDir path to where logs and oldlogs<a name="line.216"></a> |
| <span class="sourceLineNo">217</span> * @param logDir dir where wals are stored<a name="line.217"></a> |
| <span class="sourceLineNo">218</span> * @param archiveDir dir where wals are archived<a name="line.218"></a> |
| <span class="sourceLineNo">219</span> * @param conf configuration to use<a name="line.219"></a> |
| <span class="sourceLineNo">220</span> * @param listeners Listeners on WAL events. Listeners passed here will be registered before we do<a name="line.220"></a> |
| <span class="sourceLineNo">221</span> * anything else; e.g. the Constructor {@link #rollWriter()}.<a name="line.221"></a> |
| <span class="sourceLineNo">222</span> * @param failIfWALExists If true IOException will be thrown if files related to this wal already<a name="line.222"></a> |
| <span class="sourceLineNo">223</span> * exist.<a name="line.223"></a> |
| <span class="sourceLineNo">224</span> * @param prefix should always be hostname and port in distributed env and it will be URL encoded<a name="line.224"></a> |
| <span class="sourceLineNo">225</span> * before being used. If prefix is null, "wal" will be used<a name="line.225"></a> |
| <span class="sourceLineNo">226</span> * @param suffix will be url encoded. null is treated as empty. non-empty must start with<a name="line.226"></a> |
| <span class="sourceLineNo">227</span> * {@link org.apache.hadoop.hbase.wal.AbstractFSWALProvider#WAL_FILE_NAME_DELIMITER}<a name="line.227"></a> |
| <span class="sourceLineNo">228</span> */<a name="line.228"></a> |
| <span class="sourceLineNo">229</span> public FSHLog(final FileSystem fs, final Path rootDir, final String logDir,<a name="line.229"></a> |
| <span class="sourceLineNo">230</span> final String archiveDir, final Configuration conf, final List<WALActionsListener> listeners,<a name="line.230"></a> |
| <span class="sourceLineNo">231</span> final boolean failIfWALExists, final String prefix, final String suffix) throws IOException {<a name="line.231"></a> |
| <span class="sourceLineNo">232</span> super(fs, rootDir, logDir, archiveDir, conf, listeners, failIfWALExists, prefix, suffix);<a name="line.232"></a> |
| <span class="sourceLineNo">233</span> this.minTolerableReplication = conf.getInt(TOLERABLE_LOW_REPLICATION,<a name="line.233"></a> |
| <span class="sourceLineNo">234</span> CommonFSUtils.getDefaultReplication(fs, this.walDir));<a name="line.234"></a> |
| <span class="sourceLineNo">235</span> this.lowReplicationRollLimit = conf.getInt(LOW_REPLICATION_ROLL_LIMIT, DEFAULT_LOW_REPLICATION_ROLL_LIMIT);<a name="line.235"></a> |
| <span class="sourceLineNo">236</span> this.closeErrorsTolerated = conf.getInt(ROLL_ERRORS_TOLERATED, DEFAULT_ROLL_ERRORS_TOLERATED);<a name="line.236"></a> |
| <span class="sourceLineNo">237</span> this.waitOnShutdownInSeconds = conf.getInt(FSHLOG_WAIT_ON_SHUTDOWN_IN_SECONDS,<a name="line.237"></a> |
| <span class="sourceLineNo">238</span> DEFAULT_FSHLOG_WAIT_ON_SHUTDOWN_IN_SECONDS);<a name="line.238"></a> |
| <span class="sourceLineNo">239</span> // This is the 'writer' -- a single threaded executor. This single thread 'consumes' what is<a name="line.239"></a> |
| <span class="sourceLineNo">240</span> // put on the ring buffer.<a name="line.240"></a> |
| <span class="sourceLineNo">241</span> String hostingThreadName = Thread.currentThread().getName();<a name="line.241"></a> |
| <span class="sourceLineNo">242</span> // Using BlockingWaitStrategy. Stuff that is going on here takes so long it makes no sense<a name="line.242"></a> |
| <span class="sourceLineNo">243</span> // spinning as other strategies do.<a name="line.243"></a> |
| <span class="sourceLineNo">244</span> this.disruptor = new Disruptor<>(RingBufferTruck::new, getPreallocatedEventCount(),<a name="line.244"></a> |
| <span class="sourceLineNo">245</span> new ThreadFactoryBuilder().setNameFormat(hostingThreadName + ".append-pool-%d")<a name="line.245"></a> |
| <span class="sourceLineNo">246</span> .setDaemon(true).setUncaughtExceptionHandler(Threads.LOGGING_EXCEPTION_HANDLER).build(),<a name="line.246"></a> |
| <span class="sourceLineNo">247</span> ProducerType.MULTI, new BlockingWaitStrategy());<a name="line.247"></a> |
| <span class="sourceLineNo">248</span> // Advance the ring buffer sequence so that it starts from 1 instead of 0,<a name="line.248"></a> |
| <span class="sourceLineNo">249</span> // because SyncFuture.NOT_DONE = 0.<a name="line.249"></a> |
| <span class="sourceLineNo">250</span> this.disruptor.getRingBuffer().next();<a name="line.250"></a> |
| <span class="sourceLineNo">251</span> int syncerCount = conf.getInt(SYNCER_COUNT, DEFAULT_SYNCER_COUNT);<a name="line.251"></a> |
| <span class="sourceLineNo">252</span> int maxBatchCount = conf.getInt(MAX_BATCH_COUNT,<a name="line.252"></a> |
| <span class="sourceLineNo">253</span> conf.getInt(HConstants.REGION_SERVER_HANDLER_COUNT, DEFAULT_MAX_BATCH_COUNT));<a name="line.253"></a> |
| <span class="sourceLineNo">254</span> this.ringBufferEventHandler = new RingBufferEventHandler(syncerCount, maxBatchCount);<a name="line.254"></a> |
| <span class="sourceLineNo">255</span> this.disruptor.setDefaultExceptionHandler(new RingBufferExceptionHandler());<a name="line.255"></a> |
| <span class="sourceLineNo">256</span> this.disruptor.handleEventsWith(new RingBufferEventHandler[] { this.ringBufferEventHandler });<a name="line.256"></a> |
| <span class="sourceLineNo">257</span> // Starting up threads in constructor is a no no; Interface should have an init call.<a name="line.257"></a> |
| <span class="sourceLineNo">258</span> this.disruptor.start();<a name="line.258"></a> |
| <span class="sourceLineNo">259</span> }<a name="line.259"></a> |
| <span class="sourceLineNo">260</span><a name="line.260"></a> |
| <span class="sourceLineNo">261</span> /**<a name="line.261"></a> |
| <span class="sourceLineNo">262</span> * Currently, we need to expose the writer's OutputStream to tests so that they can manipulate the<a name="line.262"></a> |
| <span class="sourceLineNo">263</span> * default behavior (such as setting the maxRecoveryErrorCount value). This is<a name="line.263"></a> |
| <span class="sourceLineNo">264</span> * done using reflection on the underlying HDFS OutputStream. NOTE: This could be removed once Hadoop1 support is<a name="line.264"></a> |
| <span class="sourceLineNo">265</span> * removed.<a name="line.265"></a> |
| <span class="sourceLineNo">266</span> * @return null if underlying stream is not ready.<a name="line.266"></a> |
| <span class="sourceLineNo">267</span> */<a name="line.267"></a> |
| <span class="sourceLineNo">268</span> @VisibleForTesting<a name="line.268"></a> |
| <span class="sourceLineNo">269</span> OutputStream getOutputStream() {<a name="line.269"></a> |
| <span class="sourceLineNo">270</span> FSDataOutputStream fsdos = this.hdfs_out;<a name="line.270"></a> |
| <span class="sourceLineNo">271</span> return fsdos != null ? fsdos.getWrappedStream() : null;<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> * Run a sync after opening to set up the pipeline.<a name="line.275"></a> |
| <span class="sourceLineNo">276</span> */<a name="line.276"></a> |
| <span class="sourceLineNo">277</span> private void preemptiveSync(final ProtobufLogWriter nextWriter) {<a name="line.277"></a> |
| <span class="sourceLineNo">278</span> long startTimeNanos = System.nanoTime();<a name="line.278"></a> |
| <span class="sourceLineNo">279</span> try {<a name="line.279"></a> |
| <span class="sourceLineNo">280</span> nextWriter.sync(useHsync);<a name="line.280"></a> |
| <span class="sourceLineNo">281</span> postSync(System.nanoTime() - startTimeNanos, 0);<a name="line.281"></a> |
| <span class="sourceLineNo">282</span> } catch (IOException e) {<a name="line.282"></a> |
| <span class="sourceLineNo">283</span> // optimization failed, no need to abort here.<a name="line.283"></a> |
| <span class="sourceLineNo">284</span> LOG.warn("pre-sync failed but an optimization so keep going", e);<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><a name="line.287"></a> |
| <span class="sourceLineNo">288</span> /**<a name="line.288"></a> |
| <span class="sourceLineNo">289</span> * This method allows subclasses to inject different writers without having to extend other<a name="line.289"></a> |
| <span class="sourceLineNo">290</span> * methods like rollWriter().<a name="line.290"></a> |
| <span class="sourceLineNo">291</span> * @return Writer instance<a name="line.291"></a> |
| <span class="sourceLineNo">292</span> */<a name="line.292"></a> |
| <span class="sourceLineNo">293</span> @Override<a name="line.293"></a> |
| <span class="sourceLineNo">294</span> protected Writer createWriterInstance(final Path path) throws IOException {<a name="line.294"></a> |
| <span class="sourceLineNo">295</span> Writer writer = FSHLogProvider.createWriter(conf, fs, path, false, this.blocksize);<a name="line.295"></a> |
| <span class="sourceLineNo">296</span> if (writer instanceof ProtobufLogWriter) {<a name="line.296"></a> |
| <span class="sourceLineNo">297</span> preemptiveSync((ProtobufLogWriter) writer);<a name="line.297"></a> |
| <span class="sourceLineNo">298</span> }<a name="line.298"></a> |
| <span class="sourceLineNo">299</span> return writer;<a name="line.299"></a> |
| <span class="sourceLineNo">300</span> }<a name="line.300"></a> |
| <span class="sourceLineNo">301</span><a name="line.301"></a> |
| <span class="sourceLineNo">302</span> /**<a name="line.302"></a> |
| <span class="sourceLineNo">303</span> * Used to manufacture race condition reliably. For testing only.<a name="line.303"></a> |
| <span class="sourceLineNo">304</span> * @see #beforeWaitOnSafePoint()<a name="line.304"></a> |
| <span class="sourceLineNo">305</span> */<a name="line.305"></a> |
| <span class="sourceLineNo">306</span> @VisibleForTesting<a name="line.306"></a> |
| <span class="sourceLineNo">307</span> protected void afterCreatingZigZagLatch() {<a name="line.307"></a> |
| <span class="sourceLineNo">308</span> }<a name="line.308"></a> |
| <span class="sourceLineNo">309</span><a name="line.309"></a> |
| <span class="sourceLineNo">310</span> /**<a name="line.310"></a> |
| <span class="sourceLineNo">311</span> * @see #afterCreatingZigZagLatch()<a name="line.311"></a> |
| <span class="sourceLineNo">312</span> */<a name="line.312"></a> |
| <span class="sourceLineNo">313</span> @VisibleForTesting<a name="line.313"></a> |
| <span class="sourceLineNo">314</span> protected void beforeWaitOnSafePoint() {<a name="line.314"></a> |
| <span class="sourceLineNo">315</span> }<a name="line.315"></a> |
| <span class="sourceLineNo">316</span><a name="line.316"></a> |
| <span class="sourceLineNo">317</span> @Override<a name="line.317"></a> |
| <span class="sourceLineNo">318</span> protected void doAppend(Writer writer, FSWALEntry entry) throws IOException {<a name="line.318"></a> |
| <span class="sourceLineNo">319</span> writer.append(entry);<a name="line.319"></a> |
| <span class="sourceLineNo">320</span> }<a name="line.320"></a> |
| <span class="sourceLineNo">321</span><a name="line.321"></a> |
| <span class="sourceLineNo">322</span> @Override<a name="line.322"></a> |
| <span class="sourceLineNo">323</span> protected void doReplaceWriter(Path oldPath, Path newPath, Writer nextWriter) throws IOException {<a name="line.323"></a> |
| <span class="sourceLineNo">324</span> // Ask the ring buffer writer to pause at a safe point. Once we do this, the writer<a name="line.324"></a> |
| <span class="sourceLineNo">325</span> // thread will eventually pause. An error hereafter needs to release the writer thread<a name="line.325"></a> |
| <span class="sourceLineNo">326</span> // regardless -- hence the finally block below. Note, this method is called from the FSHLog<a name="line.326"></a> |
| <span class="sourceLineNo">327</span> // constructor BEFORE the ring buffer is set running so it is null on first time through<a name="line.327"></a> |
| <span class="sourceLineNo">328</span> // here; allow for that.<a name="line.328"></a> |
| <span class="sourceLineNo">329</span> SyncFuture syncFuture = null;<a name="line.329"></a> |
| <span class="sourceLineNo">330</span> SafePointZigZagLatch zigzagLatch = null;<a name="line.330"></a> |
| <span class="sourceLineNo">331</span> long sequence = -1L;<a name="line.331"></a> |
| <span class="sourceLineNo">332</span> if (this.writer != null && this.ringBufferEventHandler != null) {<a name="line.332"></a> |
| <span class="sourceLineNo">333</span> // Get sequence first to avoid dead lock when ring buffer is full<a name="line.333"></a> |
| <span class="sourceLineNo">334</span> // Considering below sequence<a name="line.334"></a> |
| <span class="sourceLineNo">335</span> // 1. replaceWriter is called and zigzagLatch is initialized<a name="line.335"></a> |
| <span class="sourceLineNo">336</span> // 2. ringBufferEventHandler#onEvent is called and arrives at #attainSafePoint(long) then wait<a name="line.336"></a> |
| <span class="sourceLineNo">337</span> // on safePointReleasedLatch<a name="line.337"></a> |
| <span class="sourceLineNo">338</span> // 3. Since ring buffer is full, if we get sequence when publish sync, the replaceWriter<a name="line.338"></a> |
| <span class="sourceLineNo">339</span> // thread will wait for the ring buffer to be consumed, but the only consumer is waiting<a name="line.339"></a> |
| <span class="sourceLineNo">340</span> // replaceWriter thread to release safePointReleasedLatch, which causes a deadlock<a name="line.340"></a> |
| <span class="sourceLineNo">341</span> sequence = getSequenceOnRingBuffer();<a name="line.341"></a> |
| <span class="sourceLineNo">342</span> zigzagLatch = this.ringBufferEventHandler.attainSafePoint();<a name="line.342"></a> |
| <span class="sourceLineNo">343</span> }<a name="line.343"></a> |
| <span class="sourceLineNo">344</span> afterCreatingZigZagLatch();<a name="line.344"></a> |
| <span class="sourceLineNo">345</span> try {<a name="line.345"></a> |
| <span class="sourceLineNo">346</span> // Wait on the safe point to be achieved. Send in a sync in case nothing has hit the<a name="line.346"></a> |
| <span class="sourceLineNo">347</span> // ring buffer between the above notification of writer that we want it to go to<a name="line.347"></a> |
| <span class="sourceLineNo">348</span> // 'safe point' and then here where we are waiting on it to attain safe point. Use<a name="line.348"></a> |
| <span class="sourceLineNo">349</span> // 'sendSync' instead of 'sync' because we do not want this thread to block waiting on it<a name="line.349"></a> |
| <span class="sourceLineNo">350</span> // to come back. Cleanup this syncFuture down below after we are ready to run again.<a name="line.350"></a> |
| <span class="sourceLineNo">351</span> try {<a name="line.351"></a> |
| <span class="sourceLineNo">352</span> if (zigzagLatch != null) {<a name="line.352"></a> |
| <span class="sourceLineNo">353</span> // use assert to make sure no change breaks the logic that<a name="line.353"></a> |
| <span class="sourceLineNo">354</span> // sequence and zigzagLatch will be set together<a name="line.354"></a> |
| <span class="sourceLineNo">355</span> assert sequence > 0L : "Failed to get sequence from ring buffer";<a name="line.355"></a> |
| <span class="sourceLineNo">356</span> TraceUtil.addTimelineAnnotation("awaiting safepoint");<a name="line.356"></a> |
| <span class="sourceLineNo">357</span> syncFuture = zigzagLatch.waitSafePoint(publishSyncOnRingBuffer(sequence, false));<a name="line.357"></a> |
| <span class="sourceLineNo">358</span> }<a name="line.358"></a> |
| <span class="sourceLineNo">359</span> } catch (FailedSyncBeforeLogCloseException e) {<a name="line.359"></a> |
| <span class="sourceLineNo">360</span> // If unflushed/unsynced entries on close, it is reason to abort.<a name="line.360"></a> |
| <span class="sourceLineNo">361</span> if (isUnflushedEntries()) {<a name="line.361"></a> |
| <span class="sourceLineNo">362</span> throw e;<a name="line.362"></a> |
| <span class="sourceLineNo">363</span> }<a name="line.363"></a> |
| <span class="sourceLineNo">364</span> LOG.warn(<a name="line.364"></a> |
| <span class="sourceLineNo">365</span> "Failed sync-before-close but no outstanding appends; closing WAL" + e.getMessage());<a name="line.365"></a> |
| <span class="sourceLineNo">366</span> }<a name="line.366"></a> |
| <span class="sourceLineNo">367</span> long oldFileLen = 0L;<a name="line.367"></a> |
| <span class="sourceLineNo">368</span> // It is at the safe point. Swap out writer from under the blocked writer thread.<a name="line.368"></a> |
| <span class="sourceLineNo">369</span> if (this.writer != null) {<a name="line.369"></a> |
| <span class="sourceLineNo">370</span> oldFileLen = this.writer.getLength();<a name="line.370"></a> |
| <span class="sourceLineNo">371</span> // In case of having unflushed entries or we already reached the<a name="line.371"></a> |
| <span class="sourceLineNo">372</span> // closeErrorsTolerated count, call the closeWriter inline rather than in async<a name="line.372"></a> |
| <span class="sourceLineNo">373</span> // way so that in case of an IOE we will throw it back and abort RS.<a name="line.373"></a> |
| <span class="sourceLineNo">374</span> if (isUnflushedEntries() || closeErrorCount.get() >= this.closeErrorsTolerated) {<a name="line.374"></a> |
| <span class="sourceLineNo">375</span> closeWriter(this.writer, oldPath, true);<a name="line.375"></a> |
| <span class="sourceLineNo">376</span> } else {<a name="line.376"></a> |
| <span class="sourceLineNo">377</span> Writer localWriter = this.writer;<a name="line.377"></a> |
| <span class="sourceLineNo">378</span> closeExecutor.execute(() -> {<a name="line.378"></a> |
| <span class="sourceLineNo">379</span> try {<a name="line.379"></a> |
| <span class="sourceLineNo">380</span> closeWriter(localWriter, oldPath, false);<a name="line.380"></a> |
| <span class="sourceLineNo">381</span> } catch (IOException e) {<a name="line.381"></a> |
| <span class="sourceLineNo">382</span> // We will never reach here.<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> }<a name="line.385"></a> |
| <span class="sourceLineNo">386</span> }<a name="line.386"></a> |
| <span class="sourceLineNo">387</span> logRollAndSetupWalProps(oldPath, newPath, oldFileLen);<a name="line.387"></a> |
| <span class="sourceLineNo">388</span> this.writer = nextWriter;<a name="line.388"></a> |
| <span class="sourceLineNo">389</span> if (nextWriter != null && nextWriter instanceof ProtobufLogWriter) {<a name="line.389"></a> |
| <span class="sourceLineNo">390</span> this.hdfs_out = ((ProtobufLogWriter) nextWriter).getStream();<a name="line.390"></a> |
| <span class="sourceLineNo">391</span> } else {<a name="line.391"></a> |
| <span class="sourceLineNo">392</span> this.hdfs_out = null;<a name="line.392"></a> |
| <span class="sourceLineNo">393</span> }<a name="line.393"></a> |
| <span class="sourceLineNo">394</span> } catch (InterruptedException ie) {<a name="line.394"></a> |
| <span class="sourceLineNo">395</span> // Perpetuate the interrupt<a name="line.395"></a> |
| <span class="sourceLineNo">396</span> Thread.currentThread().interrupt();<a name="line.396"></a> |
| <span class="sourceLineNo">397</span> } catch (IOException e) {<a name="line.397"></a> |
| <span class="sourceLineNo">398</span> long count = getUnflushedEntriesCount();<a name="line.398"></a> |
| <span class="sourceLineNo">399</span> LOG.error("Failed close of WAL writer " + oldPath + ", unflushedEntries=" + count, e);<a name="line.399"></a> |
| <span class="sourceLineNo">400</span> throw new FailedLogCloseException(oldPath + ", unflushedEntries=" + count, e);<a name="line.400"></a> |
| <span class="sourceLineNo">401</span> } finally {<a name="line.401"></a> |
| <span class="sourceLineNo">402</span> // Let the writer thread go regardless, whether error or not.<a name="line.402"></a> |
| <span class="sourceLineNo">403</span> if (zigzagLatch != null) {<a name="line.403"></a> |
| <span class="sourceLineNo">404</span> // Reset rollRequested status<a name="line.404"></a> |
| <span class="sourceLineNo">405</span> rollRequested.set(false);<a name="line.405"></a> |
| <span class="sourceLineNo">406</span> zigzagLatch.releaseSafePoint();<a name="line.406"></a> |
| <span class="sourceLineNo">407</span> // syncFuture will be null if we failed our wait on safe point above. Otherwise, if<a name="line.407"></a> |
| <span class="sourceLineNo">408</span> // latch was obtained successfully, the sync we threw in either trigger the latch or it<a name="line.408"></a> |
| <span class="sourceLineNo">409</span> // got stamped with an exception because the WAL was damaged and we could not sync. Now<a name="line.409"></a> |
| <span class="sourceLineNo">410</span> // the write pipeline has been opened up again by releasing the safe point, process the<a name="line.410"></a> |
| <span class="sourceLineNo">411</span> // syncFuture we got above. This is probably a noop but it may be stale exception from<a name="line.411"></a> |
| <span class="sourceLineNo">412</span> // when old WAL was in place. Catch it if so.<a name="line.412"></a> |
| <span class="sourceLineNo">413</span> if (syncFuture != null) {<a name="line.413"></a> |
| <span class="sourceLineNo">414</span> try {<a name="line.414"></a> |
| <span class="sourceLineNo">415</span> blockOnSync(syncFuture);<a name="line.415"></a> |
| <span class="sourceLineNo">416</span> } catch (IOException ioe) {<a name="line.416"></a> |
| <span class="sourceLineNo">417</span> if (LOG.isTraceEnabled()) {<a name="line.417"></a> |
| <span class="sourceLineNo">418</span> LOG.trace("Stale sync exception", ioe);<a name="line.418"></a> |
| <span class="sourceLineNo">419</span> }<a name="line.419"></a> |
| <span class="sourceLineNo">420</span> }<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> }<a name="line.423"></a> |
| <span class="sourceLineNo">424</span> }<a name="line.424"></a> |
| <span class="sourceLineNo">425</span><a name="line.425"></a> |
| <span class="sourceLineNo">426</span> private void closeWriter(Writer writer, Path path, boolean syncCloseCall) throws IOException {<a name="line.426"></a> |
| <span class="sourceLineNo">427</span> try {<a name="line.427"></a> |
| <span class="sourceLineNo">428</span> TraceUtil.addTimelineAnnotation("closing writer");<a name="line.428"></a> |
| <span class="sourceLineNo">429</span> writer.close();<a name="line.429"></a> |
| <span class="sourceLineNo">430</span> TraceUtil.addTimelineAnnotation("writer closed");<a name="line.430"></a> |
| <span class="sourceLineNo">431</span> } catch (IOException ioe) {<a name="line.431"></a> |
| <span class="sourceLineNo">432</span> int errors = closeErrorCount.incrementAndGet();<a name="line.432"></a> |
| <span class="sourceLineNo">433</span> boolean hasUnflushedEntries = isUnflushedEntries();<a name="line.433"></a> |
| <span class="sourceLineNo">434</span> if (syncCloseCall && (hasUnflushedEntries || (errors > this.closeErrorsTolerated))) {<a name="line.434"></a> |
| <span class="sourceLineNo">435</span> LOG.error("Close of WAL " + path + " failed. Cause=\"" + ioe.getMessage() + "\", errors="<a name="line.435"></a> |
| <span class="sourceLineNo">436</span> + errors + ", hasUnflushedEntries=" + hasUnflushedEntries);<a name="line.436"></a> |
| <span class="sourceLineNo">437</span> throw ioe;<a name="line.437"></a> |
| <span class="sourceLineNo">438</span> }<a name="line.438"></a> |
| <span class="sourceLineNo">439</span> LOG.warn("Riding over failed WAL close of " + path<a name="line.439"></a> |
| <span class="sourceLineNo">440</span> + "; THIS FILE WAS NOT CLOSED BUT ALL EDITS SYNCED SO SHOULD BE OK", ioe);<a name="line.440"></a> |
| <span class="sourceLineNo">441</span> }<a name="line.441"></a> |
| <span class="sourceLineNo">442</span> }<a name="line.442"></a> |
| <span class="sourceLineNo">443</span><a name="line.443"></a> |
| <span class="sourceLineNo">444</span> @Override<a name="line.444"></a> |
| <span class="sourceLineNo">445</span> protected void doShutdown() throws IOException {<a name="line.445"></a> |
| <span class="sourceLineNo">446</span> // Shutdown the disruptor. Will stop after all entries have been processed. Make sure we<a name="line.446"></a> |
| <span class="sourceLineNo">447</span> // have stopped incoming appends before calling this else it will not shutdown. We are<a name="line.447"></a> |
| <span class="sourceLineNo">448</span> // conservative below waiting a long time and if not elapsed, then halting.<a name="line.448"></a> |
| <span class="sourceLineNo">449</span> if (this.disruptor != null) {<a name="line.449"></a> |
| <span class="sourceLineNo">450</span> long timeoutms = conf.getLong("hbase.wal.disruptor.shutdown.timeout.ms", 60000);<a name="line.450"></a> |
| <span class="sourceLineNo">451</span> try {<a name="line.451"></a> |
| <span class="sourceLineNo">452</span> this.disruptor.shutdown(timeoutms, TimeUnit.MILLISECONDS);<a name="line.452"></a> |
| <span class="sourceLineNo">453</span> } catch (TimeoutException e) {<a name="line.453"></a> |
| <span class="sourceLineNo">454</span> LOG.warn("Timed out bringing down disruptor after " + timeoutms + "ms; forcing halt "<a name="line.454"></a> |
| <span class="sourceLineNo">455</span> + "(It is a problem if this is NOT an ABORT! -- DATALOSS!!!!)");<a name="line.455"></a> |
| <span class="sourceLineNo">456</span> this.disruptor.halt();<a name="line.456"></a> |
| <span class="sourceLineNo">457</span> this.disruptor.shutdown();<a name="line.457"></a> |
| <span class="sourceLineNo">458</span> }<a name="line.458"></a> |
| <span class="sourceLineNo">459</span> }<a name="line.459"></a> |
| <span class="sourceLineNo">460</span><a name="line.460"></a> |
| <span class="sourceLineNo">461</span> if (LOG.isDebugEnabled()) {<a name="line.461"></a> |
| <span class="sourceLineNo">462</span> LOG.debug("Closing WAL writer in " + CommonFSUtils.getPath(walDir));<a name="line.462"></a> |
| <span class="sourceLineNo">463</span> }<a name="line.463"></a> |
| <span class="sourceLineNo">464</span> if (this.writer != null) {<a name="line.464"></a> |
| <span class="sourceLineNo">465</span> this.writer.close();<a name="line.465"></a> |
| <span class="sourceLineNo">466</span> this.writer = null;<a name="line.466"></a> |
| <span class="sourceLineNo">467</span> }<a name="line.467"></a> |
| <span class="sourceLineNo">468</span> closeExecutor.shutdown();<a name="line.468"></a> |
| <span class="sourceLineNo">469</span> try {<a name="line.469"></a> |
| <span class="sourceLineNo">470</span> if (!closeExecutor.awaitTermination(waitOnShutdownInSeconds, TimeUnit.SECONDS)) {<a name="line.470"></a> |
| <span class="sourceLineNo">471</span> LOG.error("We have waited {} seconds but the close of writer(s) doesn't complete."<a name="line.471"></a> |
| <span class="sourceLineNo">472</span> + "Please check the status of underlying filesystem"<a name="line.472"></a> |
| <span class="sourceLineNo">473</span> + " or increase the wait time by the config \"{}\"", this.waitOnShutdownInSeconds,<a name="line.473"></a> |
| <span class="sourceLineNo">474</span> FSHLOG_WAIT_ON_SHUTDOWN_IN_SECONDS);<a name="line.474"></a> |
| <span class="sourceLineNo">475</span> }<a name="line.475"></a> |
| <span class="sourceLineNo">476</span> } catch (InterruptedException e) {<a name="line.476"></a> |
| <span class="sourceLineNo">477</span> LOG.error("The wait for termination of FSHLog writer(s) is interrupted");<a name="line.477"></a> |
| <span class="sourceLineNo">478</span> Thread.currentThread().interrupt();<a name="line.478"></a> |
| <span class="sourceLineNo">479</span> }<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> @Override<a name="line.482"></a> |
| <span class="sourceLineNo">483</span> protected long append(final RegionInfo hri, final WALKeyImpl key, final WALEdit edits,<a name="line.483"></a> |
| <span class="sourceLineNo">484</span> final boolean inMemstore) throws IOException {<a name="line.484"></a> |
| <span class="sourceLineNo">485</span> return stampSequenceIdAndPublishToRingBuffer(hri, key, edits, inMemstore,<a name="line.485"></a> |
| <span class="sourceLineNo">486</span> disruptor.getRingBuffer());<a name="line.486"></a> |
| <span class="sourceLineNo">487</span> }<a name="line.487"></a> |
| <span class="sourceLineNo">488</span><a name="line.488"></a> |
| <span class="sourceLineNo">489</span> /**<a name="line.489"></a> |
| <span class="sourceLineNo">490</span> * Thread to runs the hdfs sync call. This call takes a while to complete. This is the longest<a name="line.490"></a> |
| <span class="sourceLineNo">491</span> * pole adding edits to the WAL and this must complete to be sure all edits persisted. We run<a name="line.491"></a> |
| <span class="sourceLineNo">492</span> * multiple threads sync'ng rather than one that just syncs in series so we have better latencies;<a name="line.492"></a> |
| <span class="sourceLineNo">493</span> * otherwise, an edit that arrived just after a sync started, might have to wait almost the length<a name="line.493"></a> |
| <span class="sourceLineNo">494</span> * of two sync invocations before it is marked done.<a name="line.494"></a> |
| <span class="sourceLineNo">495</span> * <p><a name="line.495"></a> |
| <span class="sourceLineNo">496</span> * When the sync completes, it marks all the passed in futures done. On the other end of the sync<a name="line.496"></a> |
| <span class="sourceLineNo">497</span> * future is a blocked thread, usually a regionserver Handler. There may be more than one future<a name="line.497"></a> |
| <span class="sourceLineNo">498</span> * passed in the case where a few threads arrive at about the same time and all invoke 'sync'. In<a name="line.498"></a> |
| <span class="sourceLineNo">499</span> * this case we'll batch up the invocations and run one filesystem sync only for a batch of<a name="line.499"></a> |
| <span class="sourceLineNo">500</span> * Handler sync invocations. Do not confuse these Handler SyncFutures with the futures an<a name="line.500"></a> |
| <span class="sourceLineNo">501</span> * ExecutorService returns when you call submit. We have no use for these in this model. These<a name="line.501"></a> |
| <span class="sourceLineNo">502</span> * SyncFutures are 'artificial', something to hold the Handler until the filesystem sync<a name="line.502"></a> |
| <span class="sourceLineNo">503</span> * completes.<a name="line.503"></a> |
| <span class="sourceLineNo">504</span> */<a name="line.504"></a> |
| <span class="sourceLineNo">505</span> private class SyncRunner extends Thread {<a name="line.505"></a> |
| <span class="sourceLineNo">506</span> private volatile long sequence;<a name="line.506"></a> |
| <span class="sourceLineNo">507</span> // Keep around last exception thrown. Clear on successful sync.<a name="line.507"></a> |
| <span class="sourceLineNo">508</span> private final BlockingQueue<SyncFuture> syncFutures;<a name="line.508"></a> |
| <span class="sourceLineNo">509</span> private volatile SyncFuture takeSyncFuture = null;<a name="line.509"></a> |
| <span class="sourceLineNo">510</span><a name="line.510"></a> |
| <span class="sourceLineNo">511</span> SyncRunner(final String name, final int maxHandlersCount) {<a name="line.511"></a> |
| <span class="sourceLineNo">512</span> super(name);<a name="line.512"></a> |
| <span class="sourceLineNo">513</span> // LinkedBlockingQueue because of<a name="line.513"></a> |
| <span class="sourceLineNo">514</span> // http://www.javacodegeeks.com/2010/09/java-best-practices-queue-battle-and.html<a name="line.514"></a> |
| <span class="sourceLineNo">515</span> // Could use other blockingqueues here or concurrent queues.<a name="line.515"></a> |
| <span class="sourceLineNo">516</span> //<a name="line.516"></a> |
| <span class="sourceLineNo">517</span> // We could let the capacity be 'open' but bound it so we get alerted in pathological case<a name="line.517"></a> |
| <span class="sourceLineNo">518</span> // where we cannot sync and we have a bunch of threads all backed up waiting on their syncs<a name="line.518"></a> |
| <span class="sourceLineNo">519</span> // to come in. LinkedBlockingQueue actually shrinks when you remove elements so Q should<a name="line.519"></a> |
| <span class="sourceLineNo">520</span> // stay neat and tidy in usual case. Let the max size be three times the maximum handlers.<a name="line.520"></a> |
| <span class="sourceLineNo">521</span> // The passed in maxHandlerCount is the user-level handlers which is what we put up most of<a name="line.521"></a> |
| <span class="sourceLineNo">522</span> // but HBase has other handlers running too -- opening region handlers which want to write<a name="line.522"></a> |
| <span class="sourceLineNo">523</span> // the meta table when succesful (i.e. sync), closing handlers -- etc. These are usually<a name="line.523"></a> |
| <span class="sourceLineNo">524</span> // much fewer in number than the user-space handlers so Q-size should be user handlers plus<a name="line.524"></a> |
| <span class="sourceLineNo">525</span> // some space for these other handlers. Lets multiply by 3 for good-measure.<a name="line.525"></a> |
| <span class="sourceLineNo">526</span> this.syncFutures = new LinkedBlockingQueue<>(maxHandlersCount * 3);<a name="line.526"></a> |
| <span class="sourceLineNo">527</span> }<a name="line.527"></a> |
| <span class="sourceLineNo">528</span><a name="line.528"></a> |
| <span class="sourceLineNo">529</span> void offer(final long sequence, final SyncFuture[] syncFutures, final int syncFutureCount) {<a name="line.529"></a> |
| <span class="sourceLineNo">530</span> // Set sequence first because the add to the queue will wake the thread if sleeping.<a name="line.530"></a> |
| <span class="sourceLineNo">531</span> this.sequence = sequence;<a name="line.531"></a> |
| <span class="sourceLineNo">532</span> for (int i = 0; i < syncFutureCount; ++i) {<a name="line.532"></a> |
| <span class="sourceLineNo">533</span> this.syncFutures.add(syncFutures[i]);<a name="line.533"></a> |
| <span class="sourceLineNo">534</span> }<a name="line.534"></a> |
| <span class="sourceLineNo">535</span> }<a name="line.535"></a> |
| <span class="sourceLineNo">536</span><a name="line.536"></a> |
| <span class="sourceLineNo">537</span> /**<a name="line.537"></a> |
| <span class="sourceLineNo">538</span> * Release the passed <code>syncFuture</code><a name="line.538"></a> |
| <span class="sourceLineNo">539</span> * @return Returns 1.<a name="line.539"></a> |
| <span class="sourceLineNo">540</span> */<a name="line.540"></a> |
| <span class="sourceLineNo">541</span> private int releaseSyncFuture(final SyncFuture syncFuture, final long currentSequence,<a name="line.541"></a> |
| <span class="sourceLineNo">542</span> final Throwable t) {<a name="line.542"></a> |
| <span class="sourceLineNo">543</span> if (!syncFuture.done(currentSequence, t)) {<a name="line.543"></a> |
| <span class="sourceLineNo">544</span> throw new IllegalStateException();<a name="line.544"></a> |
| <span class="sourceLineNo">545</span> }<a name="line.545"></a> |
| <span class="sourceLineNo">546</span><a name="line.546"></a> |
| <span class="sourceLineNo">547</span> // This function releases one sync future only.<a name="line.547"></a> |
| <span class="sourceLineNo">548</span> return 1;<a name="line.548"></a> |
| <span class="sourceLineNo">549</span> }<a name="line.549"></a> |
| <span class="sourceLineNo">550</span><a name="line.550"></a> |
| <span class="sourceLineNo">551</span> /**<a name="line.551"></a> |
| <span class="sourceLineNo">552</span> * Release all SyncFutures whose sequence is <= <code>currentSequence</code>.<a name="line.552"></a> |
| <span class="sourceLineNo">553</span> * @param t May be non-null if we are processing SyncFutures because an exception was thrown.<a name="line.553"></a> |
| <span class="sourceLineNo">554</span> * @return Count of SyncFutures we let go.<a name="line.554"></a> |
| <span class="sourceLineNo">555</span> */<a name="line.555"></a> |
| <span class="sourceLineNo">556</span> private int releaseSyncFutures(final long currentSequence, final Throwable t) {<a name="line.556"></a> |
| <span class="sourceLineNo">557</span> int syncCount = 0;<a name="line.557"></a> |
| <span class="sourceLineNo">558</span> for (SyncFuture syncFuture; (syncFuture = this.syncFutures.peek()) != null;) {<a name="line.558"></a> |
| <span class="sourceLineNo">559</span> if (syncFuture.getTxid() > currentSequence) {<a name="line.559"></a> |
| <span class="sourceLineNo">560</span> break;<a name="line.560"></a> |
| <span class="sourceLineNo">561</span> }<a name="line.561"></a> |
| <span class="sourceLineNo">562</span> releaseSyncFuture(syncFuture, currentSequence, t);<a name="line.562"></a> |
| <span class="sourceLineNo">563</span> if (!this.syncFutures.remove(syncFuture)) {<a name="line.563"></a> |
| <span class="sourceLineNo">564</span> throw new IllegalStateException(syncFuture.toString());<a name="line.564"></a> |
| <span class="sourceLineNo">565</span> }<a name="line.565"></a> |
| <span class="sourceLineNo">566</span> syncCount++;<a name="line.566"></a> |
| <span class="sourceLineNo">567</span> }<a name="line.567"></a> |
| <span class="sourceLineNo">568</span> return syncCount;<a name="line.568"></a> |
| <span class="sourceLineNo">569</span> }<a name="line.569"></a> |
| <span class="sourceLineNo">570</span><a name="line.570"></a> |
| <span class="sourceLineNo">571</span> /**<a name="line.571"></a> |
| <span class="sourceLineNo">572</span> * @param sequence The sequence we ran the filesystem sync against.<a name="line.572"></a> |
| <span class="sourceLineNo">573</span> * @return Current highest synced sequence.<a name="line.573"></a> |
| <span class="sourceLineNo">574</span> */<a name="line.574"></a> |
| <span class="sourceLineNo">575</span> private long updateHighestSyncedSequence(long sequence) {<a name="line.575"></a> |
| <span class="sourceLineNo">576</span> long currentHighestSyncedSequence;<a name="line.576"></a> |
| <span class="sourceLineNo">577</span> // Set the highestSyncedSequence IFF our current sequence id is the 'highest'.<a name="line.577"></a> |
| <span class="sourceLineNo">578</span> do {<a name="line.578"></a> |
| <span class="sourceLineNo">579</span> currentHighestSyncedSequence = highestSyncedTxid.get();<a name="line.579"></a> |
| <span class="sourceLineNo">580</span> if (currentHighestSyncedSequence >= sequence) {<a name="line.580"></a> |
| <span class="sourceLineNo">581</span> // Set the sync number to current highwater mark; might be able to let go more<a name="line.581"></a> |
| <span class="sourceLineNo">582</span> // queued sync futures<a name="line.582"></a> |
| <span class="sourceLineNo">583</span> sequence = currentHighestSyncedSequence;<a name="line.583"></a> |
| <span class="sourceLineNo">584</span> break;<a name="line.584"></a> |
| <span class="sourceLineNo">585</span> }<a name="line.585"></a> |
| <span class="sourceLineNo">586</span> } while (!highestSyncedTxid.compareAndSet(currentHighestSyncedSequence, sequence));<a name="line.586"></a> |
| <span class="sourceLineNo">587</span> return sequence;<a name="line.587"></a> |
| <span class="sourceLineNo">588</span> }<a name="line.588"></a> |
| <span class="sourceLineNo">589</span><a name="line.589"></a> |
| <span class="sourceLineNo">590</span> boolean areSyncFuturesReleased() {<a name="line.590"></a> |
| <span class="sourceLineNo">591</span> // check whether there is no sync futures offered, and no in-flight sync futures that is being<a name="line.591"></a> |
| <span class="sourceLineNo">592</span> // processed.<a name="line.592"></a> |
| <span class="sourceLineNo">593</span> return syncFutures.size() <= 0<a name="line.593"></a> |
| <span class="sourceLineNo">594</span> && takeSyncFuture == null;<a name="line.594"></a> |
| <span class="sourceLineNo">595</span> }<a name="line.595"></a> |
| <span class="sourceLineNo">596</span><a name="line.596"></a> |
| <span class="sourceLineNo">597</span> @Override<a name="line.597"></a> |
| <span class="sourceLineNo">598</span> public void run() {<a name="line.598"></a> |
| <span class="sourceLineNo">599</span> long currentSequence;<a name="line.599"></a> |
| <span class="sourceLineNo">600</span> while (!isInterrupted()) {<a name="line.600"></a> |
| <span class="sourceLineNo">601</span> int syncCount = 0;<a name="line.601"></a> |
| <span class="sourceLineNo">602</span><a name="line.602"></a> |
| <span class="sourceLineNo">603</span> try {<a name="line.603"></a> |
| <span class="sourceLineNo">604</span> // Make a local copy of takeSyncFuture after we get it. We've been running into NPEs<a name="line.604"></a> |
| <span class="sourceLineNo">605</span> // 2020-03-22 16:54:32,180 WARN [sync.1] wal.FSHLog$SyncRunner(589): UNEXPECTED<a name="line.605"></a> |
| <span class="sourceLineNo">606</span> // java.lang.NullPointerException<a name="line.606"></a> |
| <span class="sourceLineNo">607</span> // at org.apache.hadoop.hbase.regionserver.wal.FSHLog$SyncRunner.run(FSHLog.java:582)<a name="line.607"></a> |
| <span class="sourceLineNo">608</span> // at java.lang.Thread.run(Thread.java:748)<a name="line.608"></a> |
| <span class="sourceLineNo">609</span> SyncFuture sf;<a name="line.609"></a> |
| <span class="sourceLineNo">610</span> while (true) {<a name="line.610"></a> |
| <span class="sourceLineNo">611</span> takeSyncFuture = null;<a name="line.611"></a> |
| <span class="sourceLineNo">612</span> // We have to process what we 'take' from the queue<a name="line.612"></a> |
| <span class="sourceLineNo">613</span> takeSyncFuture = this.syncFutures.take();<a name="line.613"></a> |
| <span class="sourceLineNo">614</span> // Make local copy.<a name="line.614"></a> |
| <span class="sourceLineNo">615</span> sf = takeSyncFuture;<a name="line.615"></a> |
| <span class="sourceLineNo">616</span> currentSequence = this.sequence;<a name="line.616"></a> |
| <span class="sourceLineNo">617</span> long syncFutureSequence = sf.getTxid();<a name="line.617"></a> |
| <span class="sourceLineNo">618</span> if (syncFutureSequence > currentSequence) {<a name="line.618"></a> |
| <span class="sourceLineNo">619</span> throw new IllegalStateException("currentSequence=" + currentSequence<a name="line.619"></a> |
| <span class="sourceLineNo">620</span> + ", syncFutureSequence=" + syncFutureSequence);<a name="line.620"></a> |
| <span class="sourceLineNo">621</span> }<a name="line.621"></a> |
| <span class="sourceLineNo">622</span> // See if we can process any syncfutures BEFORE we go sync.<a name="line.622"></a> |
| <span class="sourceLineNo">623</span> long currentHighestSyncedSequence = highestSyncedTxid.get();<a name="line.623"></a> |
| <span class="sourceLineNo">624</span> if (currentSequence < currentHighestSyncedSequence) {<a name="line.624"></a> |
| <span class="sourceLineNo">625</span> syncCount += releaseSyncFuture(sf, currentHighestSyncedSequence, null);<a name="line.625"></a> |
| <span class="sourceLineNo">626</span> // Done with the 'take'. Go around again and do a new 'take'.<a name="line.626"></a> |
| <span class="sourceLineNo">627</span> continue;<a name="line.627"></a> |
| <span class="sourceLineNo">628</span> }<a name="line.628"></a> |
| <span class="sourceLineNo">629</span> break;<a name="line.629"></a> |
| <span class="sourceLineNo">630</span> }<a name="line.630"></a> |
| <span class="sourceLineNo">631</span> // I got something. Lets run. Save off current sequence number in case it changes<a name="line.631"></a> |
| <span class="sourceLineNo">632</span> // while we run.<a name="line.632"></a> |
| <span class="sourceLineNo">633</span> //TODO handle htrace API change, see HBASE-18895<a name="line.633"></a> |
| <span class="sourceLineNo">634</span> //TraceScope scope = Trace.continueSpan(takeSyncFuture.getSpan());<a name="line.634"></a> |
| <span class="sourceLineNo">635</span> long start = System.nanoTime();<a name="line.635"></a> |
| <span class="sourceLineNo">636</span> Throwable lastException = null;<a name="line.636"></a> |
| <span class="sourceLineNo">637</span> try {<a name="line.637"></a> |
| <span class="sourceLineNo">638</span> TraceUtil.addTimelineAnnotation("syncing writer");<a name="line.638"></a> |
| <span class="sourceLineNo">639</span> long unSyncedFlushSeq = highestUnsyncedTxid;<a name="line.639"></a> |
| <span class="sourceLineNo">640</span> writer.sync(sf.isForceSync());<a name="line.640"></a> |
| <span class="sourceLineNo">641</span> TraceUtil.addTimelineAnnotation("writer synced");<a name="line.641"></a> |
| <span class="sourceLineNo">642</span> if (unSyncedFlushSeq > currentSequence) {<a name="line.642"></a> |
| <span class="sourceLineNo">643</span> currentSequence = unSyncedFlushSeq;<a name="line.643"></a> |
| <span class="sourceLineNo">644</span> }<a name="line.644"></a> |
| <span class="sourceLineNo">645</span> currentSequence = updateHighestSyncedSequence(currentSequence);<a name="line.645"></a> |
| <span class="sourceLineNo">646</span> } catch (IOException e) {<a name="line.646"></a> |
| <span class="sourceLineNo">647</span> LOG.error("Error syncing, request close of WAL", e);<a name="line.647"></a> |
| <span class="sourceLineNo">648</span> lastException = e;<a name="line.648"></a> |
| <span class="sourceLineNo">649</span> } catch (Exception e) {<a name="line.649"></a> |
| <span class="sourceLineNo">650</span> LOG.warn("UNEXPECTED", e);<a name="line.650"></a> |
| <span class="sourceLineNo">651</span> lastException = e;<a name="line.651"></a> |
| <span class="sourceLineNo">652</span> } finally {<a name="line.652"></a> |
| <span class="sourceLineNo">653</span> // reattach the span to the future before releasing.<a name="line.653"></a> |
| <span class="sourceLineNo">654</span> //TODO handle htrace API change, see HBASE-18895<a name="line.654"></a> |
| <span class="sourceLineNo">655</span> // takeSyncFuture.setSpan(scope.getSpan());<a name="line.655"></a> |
| <span class="sourceLineNo">656</span> // First release what we 'took' from the queue.<a name="line.656"></a> |
| <span class="sourceLineNo">657</span> syncCount += releaseSyncFuture(takeSyncFuture, currentSequence, lastException);<a name="line.657"></a> |
| <span class="sourceLineNo">658</span> // Can we release other syncs?<a name="line.658"></a> |
| <span class="sourceLineNo">659</span> syncCount += releaseSyncFutures(currentSequence, lastException);<a name="line.659"></a> |
| <span class="sourceLineNo">660</span> if (lastException != null) {<a name="line.660"></a> |
| <span class="sourceLineNo">661</span> requestLogRoll(ERROR);<a name="line.661"></a> |
| <span class="sourceLineNo">662</span> } else {<a name="line.662"></a> |
| <span class="sourceLineNo">663</span> checkLogRoll();<a name="line.663"></a> |
| <span class="sourceLineNo">664</span> }<a name="line.664"></a> |
| <span class="sourceLineNo">665</span> }<a name="line.665"></a> |
| <span class="sourceLineNo">666</span> postSync(System.nanoTime() - start, syncCount);<a name="line.666"></a> |
| <span class="sourceLineNo">667</span> } catch (InterruptedException e) {<a name="line.667"></a> |
| <span class="sourceLineNo">668</span> // Presume legit interrupt.<a name="line.668"></a> |
| <span class="sourceLineNo">669</span> Thread.currentThread().interrupt();<a name="line.669"></a> |
| <span class="sourceLineNo">670</span> } catch (Throwable t) {<a name="line.670"></a> |
| <span class="sourceLineNo">671</span> LOG.warn("UNEXPECTED, continuing", t);<a name="line.671"></a> |
| <span class="sourceLineNo">672</span> }<a name="line.672"></a> |
| <span class="sourceLineNo">673</span> }<a name="line.673"></a> |
| <span class="sourceLineNo">674</span> }<a name="line.674"></a> |
| <span class="sourceLineNo">675</span> }<a name="line.675"></a> |
| <span class="sourceLineNo">676</span><a name="line.676"></a> |
| <span class="sourceLineNo">677</span> /**<a name="line.677"></a> |
| <span class="sourceLineNo">678</span> * Schedule a log roll if needed.<a name="line.678"></a> |
| <span class="sourceLineNo">679</span> */<a name="line.679"></a> |
| <span class="sourceLineNo">680</span> private boolean checkLogRoll() {<a name="line.680"></a> |
| <span class="sourceLineNo">681</span> // If we have already requested a roll, do nothing<a name="line.681"></a> |
| <span class="sourceLineNo">682</span> if (isLogRollRequested()) {<a name="line.682"></a> |
| <span class="sourceLineNo">683</span> return false;<a name="line.683"></a> |
| <span class="sourceLineNo">684</span> }<a name="line.684"></a> |
| <span class="sourceLineNo">685</span> // Will return immediately if we are in the middle of a WAL log roll currently.<a name="line.685"></a> |
| <span class="sourceLineNo">686</span> if (!rollWriterLock.tryLock()) {<a name="line.686"></a> |
| <span class="sourceLineNo">687</span> return false;<a name="line.687"></a> |
| <span class="sourceLineNo">688</span> }<a name="line.688"></a> |
| <span class="sourceLineNo">689</span> try {<a name="line.689"></a> |
| <span class="sourceLineNo">690</span> if (doCheckLogLowReplication()) {<a name="line.690"></a> |
| <span class="sourceLineNo">691</span> LOG.warn("Requesting log roll because of low replication, current pipeline: " +<a name="line.691"></a> |
| <span class="sourceLineNo">692</span> Arrays.toString(getPipeline()));<a name="line.692"></a> |
| <span class="sourceLineNo">693</span> requestLogRoll(LOW_REPLICATION);<a name="line.693"></a> |
| <span class="sourceLineNo">694</span> return true;<a name="line.694"></a> |
| <span class="sourceLineNo">695</span> } else if (writer != null && writer.getLength() > logrollsize) {<a name="line.695"></a> |
| <span class="sourceLineNo">696</span> if (LOG.isDebugEnabled()) {<a name="line.696"></a> |
| <span class="sourceLineNo">697</span> LOG.debug("Requesting log roll because of file size threshold; length=" +<a name="line.697"></a> |
| <span class="sourceLineNo">698</span> writer.getLength() + ", logrollsize=" + logrollsize);<a name="line.698"></a> |
| <span class="sourceLineNo">699</span> }<a name="line.699"></a> |
| <span class="sourceLineNo">700</span> requestLogRoll(SIZE);<a name="line.700"></a> |
| <span class="sourceLineNo">701</span> return true;<a name="line.701"></a> |
| <span class="sourceLineNo">702</span> } else if (doCheckSlowSync()) {<a name="line.702"></a> |
| <span class="sourceLineNo">703</span> // We log this already in checkSlowSync<a name="line.703"></a> |
| <span class="sourceLineNo">704</span> requestLogRoll(SLOW_SYNC);<a name="line.704"></a> |
| <span class="sourceLineNo">705</span> return true;<a name="line.705"></a> |
| <span class="sourceLineNo">706</span> }<a name="line.706"></a> |
| <span class="sourceLineNo">707</span> } finally {<a name="line.707"></a> |
| <span class="sourceLineNo">708</span> rollWriterLock.unlock();<a name="line.708"></a> |
| <span class="sourceLineNo">709</span> }<a name="line.709"></a> |
| <span class="sourceLineNo">710</span> return false;<a name="line.710"></a> |
| <span class="sourceLineNo">711</span> }<a name="line.711"></a> |
| <span class="sourceLineNo">712</span><a name="line.712"></a> |
| <span class="sourceLineNo">713</span> /**<a name="line.713"></a> |
| <span class="sourceLineNo">714</span> * @return true if number of replicas for the WAL is lower than threshold<a name="line.714"></a> |
| <span class="sourceLineNo">715</span> */<a name="line.715"></a> |
| <span class="sourceLineNo">716</span> @Override<a name="line.716"></a> |
| <span class="sourceLineNo">717</span> protected boolean doCheckLogLowReplication() {<a name="line.717"></a> |
| <span class="sourceLineNo">718</span> boolean logRollNeeded = false;<a name="line.718"></a> |
| <span class="sourceLineNo">719</span> // if the number of replicas in HDFS has fallen below the configured<a name="line.719"></a> |
| <span class="sourceLineNo">720</span> // value, then roll logs.<a name="line.720"></a> |
| <span class="sourceLineNo">721</span> try {<a name="line.721"></a> |
| <span class="sourceLineNo">722</span> int numCurrentReplicas = getLogReplication();<a name="line.722"></a> |
| <span class="sourceLineNo">723</span> if (numCurrentReplicas != 0 && numCurrentReplicas < this.minTolerableReplication) {<a name="line.723"></a> |
| <span class="sourceLineNo">724</span> if (this.lowReplicationRollEnabled) {<a name="line.724"></a> |
| <span class="sourceLineNo">725</span> if (this.consecutiveLogRolls.get() < this.lowReplicationRollLimit) {<a name="line.725"></a> |
| <span class="sourceLineNo">726</span> LOG.warn("HDFS pipeline error detected. " + "Found " + numCurrentReplicas<a name="line.726"></a> |
| <span class="sourceLineNo">727</span> + " replicas but expecting no less than " + this.minTolerableReplication<a name="line.727"></a> |
| <span class="sourceLineNo">728</span> + " replicas. " + " Requesting close of WAL. current pipeline: "<a name="line.728"></a> |
| <span class="sourceLineNo">729</span> + Arrays.toString(getPipeline()));<a name="line.729"></a> |
| <span class="sourceLineNo">730</span> logRollNeeded = true;<a name="line.730"></a> |
| <span class="sourceLineNo">731</span> // If rollWriter is requested, increase consecutiveLogRolls. Once it<a name="line.731"></a> |
| <span class="sourceLineNo">732</span> // is larger than lowReplicationRollLimit, disable the<a name="line.732"></a> |
| <span class="sourceLineNo">733</span> // LowReplication-Roller<a name="line.733"></a> |
| <span class="sourceLineNo">734</span> this.consecutiveLogRolls.getAndIncrement();<a name="line.734"></a> |
| <span class="sourceLineNo">735</span> } else {<a name="line.735"></a> |
| <span class="sourceLineNo">736</span> LOG.warn("Too many consecutive RollWriter requests, it's a sign of "<a name="line.736"></a> |
| <span class="sourceLineNo">737</span> + "the total number of live datanodes is lower than the tolerable replicas.");<a name="line.737"></a> |
| <span class="sourceLineNo">738</span> this.consecutiveLogRolls.set(0);<a name="line.738"></a> |
| <span class="sourceLineNo">739</span> this.lowReplicationRollEnabled = false;<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> } else if (numCurrentReplicas >= this.minTolerableReplication) {<a name="line.742"></a> |
| <span class="sourceLineNo">743</span> if (!this.lowReplicationRollEnabled) {<a name="line.743"></a> |
| <span class="sourceLineNo">744</span> // The new writer's log replicas is always the default value.<a name="line.744"></a> |
| <span class="sourceLineNo">745</span> // So we should not enable LowReplication-Roller. If numEntries<a name="line.745"></a> |
| <span class="sourceLineNo">746</span> // is lower than or equals 1, we consider it as a new writer.<a name="line.746"></a> |
| <span class="sourceLineNo">747</span> if (this.numEntries.get() <= 1) {<a name="line.747"></a> |
| <span class="sourceLineNo">748</span> return logRollNeeded;<a name="line.748"></a> |
| <span class="sourceLineNo">749</span> }<a name="line.749"></a> |
| <span class="sourceLineNo">750</span> // Once the live datanode number and the replicas return to normal,<a name="line.750"></a> |
| <span class="sourceLineNo">751</span> // enable the LowReplication-Roller.<a name="line.751"></a> |
| <span class="sourceLineNo">752</span> this.lowReplicationRollEnabled = true;<a name="line.752"></a> |
| <span class="sourceLineNo">753</span> LOG.info("LowReplication-Roller was enabled.");<a name="line.753"></a> |
| <span class="sourceLineNo">754</span> }<a name="line.754"></a> |
| <span class="sourceLineNo">755</span> }<a name="line.755"></a> |
| <span class="sourceLineNo">756</span> } catch (Exception e) {<a name="line.756"></a> |
| <span class="sourceLineNo">757</span> LOG.warn("DFSOutputStream.getNumCurrentReplicas failed because of " + e + ", continuing...");<a name="line.757"></a> |
| <span class="sourceLineNo">758</span> }<a name="line.758"></a> |
| <span class="sourceLineNo">759</span> return logRollNeeded;<a name="line.759"></a> |
| <span class="sourceLineNo">760</span> }<a name="line.760"></a> |
| <span class="sourceLineNo">761</span><a name="line.761"></a> |
| <span class="sourceLineNo">762</span> @VisibleForTesting<a name="line.762"></a> |
| <span class="sourceLineNo">763</span> protected long getSequenceOnRingBuffer() {<a name="line.763"></a> |
| <span class="sourceLineNo">764</span> return this.disruptor.getRingBuffer().next();<a name="line.764"></a> |
| <span class="sourceLineNo">765</span> }<a name="line.765"></a> |
| <span class="sourceLineNo">766</span><a name="line.766"></a> |
| <span class="sourceLineNo">767</span> private SyncFuture publishSyncOnRingBuffer(boolean forceSync) {<a name="line.767"></a> |
| <span class="sourceLineNo">768</span> long sequence = getSequenceOnRingBuffer();<a name="line.768"></a> |
| <span class="sourceLineNo">769</span> return publishSyncOnRingBuffer(sequence, forceSync);<a name="line.769"></a> |
| <span class="sourceLineNo">770</span> }<a name="line.770"></a> |
| <span class="sourceLineNo">771</span><a name="line.771"></a> |
| <span class="sourceLineNo">772</span> @VisibleForTesting<a name="line.772"></a> |
| <span class="sourceLineNo">773</span> protected SyncFuture publishSyncOnRingBuffer(long sequence, boolean forceSync) {<a name="line.773"></a> |
| <span class="sourceLineNo">774</span> // here we use ring buffer sequence as transaction id<a name="line.774"></a> |
| <span class="sourceLineNo">775</span> SyncFuture syncFuture = getSyncFuture(sequence, forceSync);<a name="line.775"></a> |
| <span class="sourceLineNo">776</span> try {<a name="line.776"></a> |
| <span class="sourceLineNo">777</span> RingBufferTruck truck = this.disruptor.getRingBuffer().get(sequence);<a name="line.777"></a> |
| <span class="sourceLineNo">778</span> truck.load(syncFuture);<a name="line.778"></a> |
| <span class="sourceLineNo">779</span> } finally {<a name="line.779"></a> |
| <span class="sourceLineNo">780</span> this.disruptor.getRingBuffer().publish(sequence);<a name="line.780"></a> |
| <span class="sourceLineNo">781</span> }<a name="line.781"></a> |
| <span class="sourceLineNo">782</span> return syncFuture;<a name="line.782"></a> |
| <span class="sourceLineNo">783</span> }<a name="line.783"></a> |
| <span class="sourceLineNo">784</span><a name="line.784"></a> |
| <span class="sourceLineNo">785</span> // Sync all known transactions<a name="line.785"></a> |
| <span class="sourceLineNo">786</span> private void publishSyncThenBlockOnCompletion(TraceScope scope, boolean forceSync) throws IOException {<a name="line.786"></a> |
| <span class="sourceLineNo">787</span> SyncFuture syncFuture = publishSyncOnRingBuffer(forceSync);<a name="line.787"></a> |
| <span class="sourceLineNo">788</span> blockOnSync(syncFuture);<a name="line.788"></a> |
| <span class="sourceLineNo">789</span> }<a name="line.789"></a> |
| <span class="sourceLineNo">790</span><a name="line.790"></a> |
| <span class="sourceLineNo">791</span> /**<a name="line.791"></a> |
| <span class="sourceLineNo">792</span> * {@inheritDoc}<a name="line.792"></a> |
| <span class="sourceLineNo">793</span> * <p><a name="line.793"></a> |
| <span class="sourceLineNo">794</span> * If the pipeline isn't started yet or is empty, you will get the default replication factor.<a name="line.794"></a> |
| <span class="sourceLineNo">795</span> * Therefore, if this function returns 0, it means you are not properly running with the HDFS-826<a name="line.795"></a> |
| <span class="sourceLineNo">796</span> * patch.<a name="line.796"></a> |
| <span class="sourceLineNo">797</span> */<a name="line.797"></a> |
| <span class="sourceLineNo">798</span> @Override<a name="line.798"></a> |
| <span class="sourceLineNo">799</span> @VisibleForTesting<a name="line.799"></a> |
| <span class="sourceLineNo">800</span> int getLogReplication() {<a name="line.800"></a> |
| <span class="sourceLineNo">801</span> try {<a name="line.801"></a> |
| <span class="sourceLineNo">802</span> // in standalone mode, it will return 0<a name="line.802"></a> |
| <span class="sourceLineNo">803</span> if (this.hdfs_out instanceof HdfsDataOutputStream) {<a name="line.803"></a> |
| <span class="sourceLineNo">804</span> return ((HdfsDataOutputStream) this.hdfs_out).getCurrentBlockReplication();<a name="line.804"></a> |
| <span class="sourceLineNo">805</span> }<a name="line.805"></a> |
| <span class="sourceLineNo">806</span> } catch (IOException e) {<a name="line.806"></a> |
| <span class="sourceLineNo">807</span> LOG.info("", e);<a name="line.807"></a> |
| <span class="sourceLineNo">808</span> }<a name="line.808"></a> |
| <span class="sourceLineNo">809</span> return 0;<a name="line.809"></a> |
| <span class="sourceLineNo">810</span> }<a name="line.810"></a> |
| <span class="sourceLineNo">811</span><a name="line.811"></a> |
| <span class="sourceLineNo">812</span> @Override<a name="line.812"></a> |
| <span class="sourceLineNo">813</span> public void sync() throws IOException {<a name="line.813"></a> |
| <span class="sourceLineNo">814</span> sync(useHsync);<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> @Override<a name="line.817"></a> |
| <span class="sourceLineNo">818</span> public void sync(boolean forceSync) throws IOException {<a name="line.818"></a> |
| <span class="sourceLineNo">819</span> try (TraceScope scope = TraceUtil.createTrace("FSHLog.sync")) {<a name="line.819"></a> |
| <span class="sourceLineNo">820</span> publishSyncThenBlockOnCompletion(scope, forceSync);<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><a name="line.823"></a> |
| <span class="sourceLineNo">824</span> @Override<a name="line.824"></a> |
| <span class="sourceLineNo">825</span> public void sync(long txid) throws IOException {<a name="line.825"></a> |
| <span class="sourceLineNo">826</span> sync(txid, useHsync);<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> public void sync(long txid, boolean forceSync) throws IOException {<a name="line.830"></a> |
| <span class="sourceLineNo">831</span> if (this.highestSyncedTxid.get() >= txid) {<a name="line.831"></a> |
| <span class="sourceLineNo">832</span> // Already sync'd.<a name="line.832"></a> |
| <span class="sourceLineNo">833</span> return;<a name="line.833"></a> |
| <span class="sourceLineNo">834</span> }<a name="line.834"></a> |
| <span class="sourceLineNo">835</span> try (TraceScope scope = TraceUtil.createTrace("FSHLog.sync")) {<a name="line.835"></a> |
| <span class="sourceLineNo">836</span> publishSyncThenBlockOnCompletion(scope, forceSync);<a name="line.836"></a> |
| <span class="sourceLineNo">837</span> }<a name="line.837"></a> |
| <span class="sourceLineNo">838</span> }<a name="line.838"></a> |
| <span class="sourceLineNo">839</span><a name="line.839"></a> |
| <span class="sourceLineNo">840</span> @VisibleForTesting<a name="line.840"></a> |
| <span class="sourceLineNo">841</span> boolean isLowReplicationRollEnabled() {<a name="line.841"></a> |
| <span class="sourceLineNo">842</span> return lowReplicationRollEnabled;<a name="line.842"></a> |
| <span class="sourceLineNo">843</span> }<a name="line.843"></a> |
| <span class="sourceLineNo">844</span><a name="line.844"></a> |
| <span class="sourceLineNo">845</span> public static final long FIXED_OVERHEAD = ClassSize<a name="line.845"></a> |
| <span class="sourceLineNo">846</span> .align(ClassSize.OBJECT + (5 * ClassSize.REFERENCE) + (2 * ClassSize.ATOMIC_INTEGER)<a name="line.846"></a> |
| <span class="sourceLineNo">847</span> + (3 * Bytes.SIZEOF_INT) + (4 * Bytes.SIZEOF_LONG));<a name="line.847"></a> |
| <span class="sourceLineNo">848</span><a name="line.848"></a> |
| <span class="sourceLineNo">849</span> /**<a name="line.849"></a> |
| <span class="sourceLineNo">850</span> * This class is used coordinating two threads holding one thread at a 'safe point' while the<a name="line.850"></a> |
| <span class="sourceLineNo">851</span> * orchestrating thread does some work that requires the first thread paused: e.g. holding the WAL<a name="line.851"></a> |
| <span class="sourceLineNo">852</span> * writer while its WAL is swapped out from under it by another thread.<a name="line.852"></a> |
| <span class="sourceLineNo">853</span> * <p><a name="line.853"></a> |
| <span class="sourceLineNo">854</span> * Thread A signals Thread B to hold when it gets to a 'safe point'. Thread A wait until Thread B<a name="line.854"></a> |
| <span class="sourceLineNo">855</span> * gets there. When the 'safe point' has been attained, Thread B signals Thread A. Thread B then<a name="line.855"></a> |
| <span class="sourceLineNo">856</span> * holds at the 'safe point'. Thread A on notification that Thread B is paused, goes ahead and<a name="line.856"></a> |
| <span class="sourceLineNo">857</span> * does the work it needs to do while Thread B is holding. When Thread A is done, it flags B and<a name="line.857"></a> |
| <span class="sourceLineNo">858</span> * then Thread A and Thread B continue along on their merry way. Pause and signalling 'zigzags'<a name="line.858"></a> |
| <span class="sourceLineNo">859</span> * between the two participating threads. We use two latches -- one the inverse of the other --<a name="line.859"></a> |
| <span class="sourceLineNo">860</span> * pausing and signaling when states are achieved.<a name="line.860"></a> |
| <span class="sourceLineNo">861</span> * <p><a name="line.861"></a> |
| <span class="sourceLineNo">862</span> * To start up the drama, Thread A creates an instance of this class each time it would do this<a name="line.862"></a> |
| <span class="sourceLineNo">863</span> * zigzag dance and passes it to Thread B (these classes use Latches so it is one shot only).<a name="line.863"></a> |
| <span class="sourceLineNo">864</span> * Thread B notices the new instance (via reading a volatile reference or how ever) and it starts<a name="line.864"></a> |
| <span class="sourceLineNo">865</span> * to work toward the 'safe point'. Thread A calls {@link #waitSafePoint(SyncFuture)} when it cannot proceed<a name="line.865"></a> |
| <span class="sourceLineNo">866</span> * until the Thread B 'safe point' is attained. Thread A will be held inside in<a name="line.866"></a> |
| <span class="sourceLineNo">867</span> * {@link #waitSafePoint(SyncFuture)} until Thread B reaches the 'safe point'. Once there, Thread B frees<a name="line.867"></a> |
| <span class="sourceLineNo">868</span> * Thread A by calling {@link #safePointAttained()}. Thread A now knows Thread B is at the 'safe<a name="line.868"></a> |
| <span class="sourceLineNo">869</span> * point' and that it is holding there (When Thread B calls {@link #safePointAttained()} it blocks<a name="line.869"></a> |
| <span class="sourceLineNo">870</span> * here until Thread A calls {@link #releaseSafePoint()}). Thread A proceeds to do what it needs<a name="line.870"></a> |
| <span class="sourceLineNo">871</span> * to do while Thread B is paused. When finished, it lets Thread B lose by calling<a name="line.871"></a> |
| <span class="sourceLineNo">872</span> * {@link #releaseSafePoint()} and away go both Threads again.<a name="line.872"></a> |
| <span class="sourceLineNo">873</span> */<a name="line.873"></a> |
| <span class="sourceLineNo">874</span> static class SafePointZigZagLatch {<a name="line.874"></a> |
| <span class="sourceLineNo">875</span> /**<a name="line.875"></a> |
| <span class="sourceLineNo">876</span> * Count down this latch when safe point attained.<a name="line.876"></a> |
| <span class="sourceLineNo">877</span> */<a name="line.877"></a> |
| <span class="sourceLineNo">878</span> private volatile CountDownLatch safePointAttainedLatch = new CountDownLatch(1);<a name="line.878"></a> |
| <span class="sourceLineNo">879</span> /**<a name="line.879"></a> |
| <span class="sourceLineNo">880</span> * Latch to wait on. Will be released when we can proceed.<a name="line.880"></a> |
| <span class="sourceLineNo">881</span> */<a name="line.881"></a> |
| <span class="sourceLineNo">882</span> private volatile CountDownLatch safePointReleasedLatch = new CountDownLatch(1);<a name="line.882"></a> |
| <span class="sourceLineNo">883</span><a name="line.883"></a> |
| <span class="sourceLineNo">884</span> private void checkIfSyncFailed(SyncFuture syncFuture) throws FailedSyncBeforeLogCloseException {<a name="line.884"></a> |
| <span class="sourceLineNo">885</span> if (syncFuture.isThrowable()) {<a name="line.885"></a> |
| <span class="sourceLineNo">886</span> throw new FailedSyncBeforeLogCloseException(syncFuture.getThrowable());<a name="line.886"></a> |
| <span class="sourceLineNo">887</span> }<a name="line.887"></a> |
| <span class="sourceLineNo">888</span> }<a name="line.888"></a> |
| <span class="sourceLineNo">889</span><a name="line.889"></a> |
| <span class="sourceLineNo">890</span> /**<a name="line.890"></a> |
| <span class="sourceLineNo">891</span> * For Thread A to call when it is ready to wait on the 'safe point' to be attained. Thread A<a name="line.891"></a> |
| <span class="sourceLineNo">892</span> * will be held in here until Thread B calls {@link #safePointAttained()}<a name="line.892"></a> |
| <span class="sourceLineNo">893</span> * @param syncFuture We need this as barometer on outstanding syncs. If it comes home with an<a name="line.893"></a> |
| <span class="sourceLineNo">894</span> * exception, then something is up w/ our syncing.<a name="line.894"></a> |
| <span class="sourceLineNo">895</span> * @return The passed <code>syncFuture</code><a name="line.895"></a> |
| <span class="sourceLineNo">896</span> */<a name="line.896"></a> |
| <span class="sourceLineNo">897</span> SyncFuture waitSafePoint(SyncFuture syncFuture) throws InterruptedException,<a name="line.897"></a> |
| <span class="sourceLineNo">898</span> FailedSyncBeforeLogCloseException {<a name="line.898"></a> |
| <span class="sourceLineNo">899</span> while (!this.safePointAttainedLatch.await(1, TimeUnit.MILLISECONDS)) {<a name="line.899"></a> |
| <span class="sourceLineNo">900</span> checkIfSyncFailed(syncFuture);<a name="line.900"></a> |
| <span class="sourceLineNo">901</span> }<a name="line.901"></a> |
| <span class="sourceLineNo">902</span> checkIfSyncFailed(syncFuture);<a name="line.902"></a> |
| <span class="sourceLineNo">903</span> return syncFuture;<a name="line.903"></a> |
| <span class="sourceLineNo">904</span> }<a name="line.904"></a> |
| <span class="sourceLineNo">905</span><a name="line.905"></a> |
| <span class="sourceLineNo">906</span> /**<a name="line.906"></a> |
| <span class="sourceLineNo">907</span> * Called by Thread B when it attains the 'safe point'. In this method, Thread B signals Thread<a name="line.907"></a> |
| <span class="sourceLineNo">908</span> * A it can proceed. Thread B will be held in here until {@link #releaseSafePoint()} is called<a name="line.908"></a> |
| <span class="sourceLineNo">909</span> * by Thread A.<a name="line.909"></a> |
| <span class="sourceLineNo">910</span> */<a name="line.910"></a> |
| <span class="sourceLineNo">911</span> void safePointAttained() throws InterruptedException {<a name="line.911"></a> |
| <span class="sourceLineNo">912</span> this.safePointAttainedLatch.countDown();<a name="line.912"></a> |
| <span class="sourceLineNo">913</span> this.safePointReleasedLatch.await();<a name="line.913"></a> |
| <span class="sourceLineNo">914</span> }<a name="line.914"></a> |
| <span class="sourceLineNo">915</span><a name="line.915"></a> |
| <span class="sourceLineNo">916</span> /**<a name="line.916"></a> |
| <span class="sourceLineNo">917</span> * Called by Thread A when it is done with the work it needs to do while Thread B is halted.<a name="line.917"></a> |
| <span class="sourceLineNo">918</span> * This will release the Thread B held in a call to {@link #safePointAttained()}<a name="line.918"></a> |
| <span class="sourceLineNo">919</span> */<a name="line.919"></a> |
| <span class="sourceLineNo">920</span> void releaseSafePoint() {<a name="line.920"></a> |
| <span class="sourceLineNo">921</span> this.safePointReleasedLatch.countDown();<a name="line.921"></a> |
| <span class="sourceLineNo">922</span> }<a name="line.922"></a> |
| <span class="sourceLineNo">923</span><a name="line.923"></a> |
| <span class="sourceLineNo">924</span> /**<a name="line.924"></a> |
| <span class="sourceLineNo">925</span> * @return True is this is a 'cocked', fresh instance, and not one that has already fired.<a name="line.925"></a> |
| <span class="sourceLineNo">926</span> */<a name="line.926"></a> |
| <span class="sourceLineNo">927</span> boolean isCocked() {<a name="line.927"></a> |
| <span class="sourceLineNo">928</span> return this.safePointAttainedLatch.getCount() > 0<a name="line.928"></a> |
| <span class="sourceLineNo">929</span> && this.safePointReleasedLatch.getCount() > 0;<a name="line.929"></a> |
| <span class="sourceLineNo">930</span> }<a name="line.930"></a> |
| <span class="sourceLineNo">931</span> }<a name="line.931"></a> |
| <span class="sourceLineNo">932</span><a name="line.932"></a> |
| <span class="sourceLineNo">933</span> /**<a name="line.933"></a> |
| <span class="sourceLineNo">934</span> * Handler that is run by the disruptor ringbuffer consumer. Consumer is a SINGLE<a name="line.934"></a> |
| <span class="sourceLineNo">935</span> * 'writer/appender' thread. Appends edits and starts up sync runs. Tries its best to batch up<a name="line.935"></a> |
| <span class="sourceLineNo">936</span> * syncs. There is no discernible benefit batching appends so we just append as they come in<a name="line.936"></a> |
| <span class="sourceLineNo">937</span> * because it simplifies the below implementation. See metrics for batching effectiveness (In<a name="line.937"></a> |
| <span class="sourceLineNo">938</span> * measurement, at 100 concurrent handlers writing 1k, we are batching > 10 appends and 10 handler<a name="line.938"></a> |
| <span class="sourceLineNo">939</span> * sync invocations for every actual dfsclient sync call; at 10 concurrent handlers, YMMV).<a name="line.939"></a> |
| <span class="sourceLineNo">940</span> * <p><a name="line.940"></a> |
| <span class="sourceLineNo">941</span> * Herein, we have an array into which we store the sync futures as they come in. When we have a<a name="line.941"></a> |
| <span class="sourceLineNo">942</span> * 'batch', we'll then pass what we have collected to a SyncRunner thread to do the filesystem<a name="line.942"></a> |
| <span class="sourceLineNo">943</span> * sync. When it completes, it will then call {@link SyncFuture#done(long, Throwable)} on each of<a name="line.943"></a> |
| <span class="sourceLineNo">944</span> * SyncFutures in the batch to release blocked Handler threads.<a name="line.944"></a> |
| <span class="sourceLineNo">945</span> * <p><a name="line.945"></a> |
| <span class="sourceLineNo">946</span> * I've tried various effects to try and make latencies low while keeping throughput high. I've<a name="line.946"></a> |
| <span class="sourceLineNo">947</span> * tried keeping a single Queue of SyncFutures in this class appending to its tail as the syncs<a name="line.947"></a> |
| <span class="sourceLineNo">948</span> * coming and having sync runner threads poll off the head to 'finish' completed SyncFutures. I've<a name="line.948"></a> |
| <span class="sourceLineNo">949</span> * tried linkedlist, and various from concurrent utils whether LinkedBlockingQueue or<a name="line.949"></a> |
| <span class="sourceLineNo">950</span> * ArrayBlockingQueue, etc. The more points of synchronization, the more 'work' (according to<a name="line.950"></a> |
| <span class="sourceLineNo">951</span> * 'perf stats') that has to be done; small increases in stall percentages seem to have a big<a name="line.951"></a> |
| <span class="sourceLineNo">952</span> * impact on throughput/latencies. The below model where we have an array into which we stash the<a name="line.952"></a> |
| <span class="sourceLineNo">953</span> * syncs and then hand them off to the sync thread seemed like a decent compromise. See HBASE-8755<a name="line.953"></a> |
| <span class="sourceLineNo">954</span> * for more detail.<a name="line.954"></a> |
| <span class="sourceLineNo">955</span> */<a name="line.955"></a> |
| <span class="sourceLineNo">956</span> class RingBufferEventHandler implements EventHandler<RingBufferTruck>, LifecycleAware {<a name="line.956"></a> |
| <span class="sourceLineNo">957</span> private final SyncRunner[] syncRunners;<a name="line.957"></a> |
| <span class="sourceLineNo">958</span> private final SyncFuture[] syncFutures;<a name="line.958"></a> |
| <span class="sourceLineNo">959</span> // Had 'interesting' issues when this was non-volatile. On occasion, we'd not pass all<a name="line.959"></a> |
| <span class="sourceLineNo">960</span> // syncFutures to the next sync'ing thread.<a name="line.960"></a> |
| <span class="sourceLineNo">961</span> private AtomicInteger syncFuturesCount = new AtomicInteger();<a name="line.961"></a> |
| <span class="sourceLineNo">962</span> private volatile SafePointZigZagLatch zigzagLatch;<a name="line.962"></a> |
| <span class="sourceLineNo">963</span> /**<a name="line.963"></a> |
| <span class="sourceLineNo">964</span> * Set if we get an exception appending or syncing so that all subsequence appends and syncs on<a name="line.964"></a> |
| <span class="sourceLineNo">965</span> * this WAL fail until WAL is replaced.<a name="line.965"></a> |
| <span class="sourceLineNo">966</span> */<a name="line.966"></a> |
| <span class="sourceLineNo">967</span> private Exception exception = null;<a name="line.967"></a> |
| <span class="sourceLineNo">968</span> /**<a name="line.968"></a> |
| <span class="sourceLineNo">969</span> * Object to block on while waiting on safe point.<a name="line.969"></a> |
| <span class="sourceLineNo">970</span> */<a name="line.970"></a> |
| <span class="sourceLineNo">971</span> private final Object safePointWaiter = new Object();<a name="line.971"></a> |
| <span class="sourceLineNo">972</span> private volatile boolean shutdown = false;<a name="line.972"></a> |
| <span class="sourceLineNo">973</span><a name="line.973"></a> |
| <span class="sourceLineNo">974</span> /**<a name="line.974"></a> |
| <span class="sourceLineNo">975</span> * Which syncrunner to use next.<a name="line.975"></a> |
| <span class="sourceLineNo">976</span> */<a name="line.976"></a> |
| <span class="sourceLineNo">977</span> private int syncRunnerIndex;<a name="line.977"></a> |
| <span class="sourceLineNo">978</span><a name="line.978"></a> |
| <span class="sourceLineNo">979</span> RingBufferEventHandler(final int syncRunnerCount, final int maxBatchCount) {<a name="line.979"></a> |
| <span class="sourceLineNo">980</span> this.syncFutures = new SyncFuture[maxBatchCount];<a name="line.980"></a> |
| <span class="sourceLineNo">981</span> this.syncRunners = new SyncRunner[syncRunnerCount];<a name="line.981"></a> |
| <span class="sourceLineNo">982</span> for (int i = 0; i < syncRunnerCount; i++) {<a name="line.982"></a> |
| <span class="sourceLineNo">983</span> this.syncRunners[i] = new SyncRunner("sync." + i, maxBatchCount);<a name="line.983"></a> |
| <span class="sourceLineNo">984</span> }<a name="line.984"></a> |
| <span class="sourceLineNo">985</span> }<a name="line.985"></a> |
| <span class="sourceLineNo">986</span><a name="line.986"></a> |
| <span class="sourceLineNo">987</span> private void cleanupOutstandingSyncsOnException(final long sequence, final Exception e) {<a name="line.987"></a> |
| <span class="sourceLineNo">988</span> // There could be handler-count syncFutures outstanding.<a name="line.988"></a> |
| <span class="sourceLineNo">989</span> for (int i = 0; i < this.syncFuturesCount.get(); i++) {<a name="line.989"></a> |
| <span class="sourceLineNo">990</span> this.syncFutures[i].done(sequence, e);<a name="line.990"></a> |
| <span class="sourceLineNo">991</span> }<a name="line.991"></a> |
| <span class="sourceLineNo">992</span> this.syncFuturesCount.set(0);<a name="line.992"></a> |
| <span class="sourceLineNo">993</span> }<a name="line.993"></a> |
| <span class="sourceLineNo">994</span><a name="line.994"></a> |
| <span class="sourceLineNo">995</span> /**<a name="line.995"></a> |
| <span class="sourceLineNo">996</span> * @return True if outstanding sync futures still<a name="line.996"></a> |
| <span class="sourceLineNo">997</span> */<a name="line.997"></a> |
| <span class="sourceLineNo">998</span> private boolean isOutstandingSyncs() {<a name="line.998"></a> |
| <span class="sourceLineNo">999</span> // Look at SyncFutures in the EventHandler<a name="line.999"></a> |
| <span class="sourceLineNo">1000</span> for (int i = 0; i < this.syncFuturesCount.get(); i++) {<a name="line.1000"></a> |
| <span class="sourceLineNo">1001</span> if (!this.syncFutures[i].isDone()) {<a name="line.1001"></a> |
| <span class="sourceLineNo">1002</span> return true;<a name="line.1002"></a> |
| <span class="sourceLineNo">1003</span> }<a name="line.1003"></a> |
| <span class="sourceLineNo">1004</span> }<a name="line.1004"></a> |
| <span class="sourceLineNo">1005</span><a name="line.1005"></a> |
| <span class="sourceLineNo">1006</span> return false;<a name="line.1006"></a> |
| <span class="sourceLineNo">1007</span> }<a name="line.1007"></a> |
| <span class="sourceLineNo">1008</span><a name="line.1008"></a> |
| <span class="sourceLineNo">1009</span> private boolean isOutstandingSyncsFromRunners() {<a name="line.1009"></a> |
| <span class="sourceLineNo">1010</span> // Look at SyncFutures in the SyncRunners<a name="line.1010"></a> |
| <span class="sourceLineNo">1011</span> for (SyncRunner syncRunner: syncRunners) {<a name="line.1011"></a> |
| <span class="sourceLineNo">1012</span> if(syncRunner.isAlive() && !syncRunner.areSyncFuturesReleased()) {<a name="line.1012"></a> |
| <span class="sourceLineNo">1013</span> return true;<a name="line.1013"></a> |
| <span class="sourceLineNo">1014</span> }<a name="line.1014"></a> |
| <span class="sourceLineNo">1015</span> }<a name="line.1015"></a> |
| <span class="sourceLineNo">1016</span> return false;<a name="line.1016"></a> |
| <span class="sourceLineNo">1017</span> }<a name="line.1017"></a> |
| <span class="sourceLineNo">1018</span><a name="line.1018"></a> |
| <span class="sourceLineNo">1019</span> @Override<a name="line.1019"></a> |
| <span class="sourceLineNo">1020</span> // We can set endOfBatch in the below method if at end of our this.syncFutures array<a name="line.1020"></a> |
| <span class="sourceLineNo">1021</span> public void onEvent(final RingBufferTruck truck, final long sequence, boolean endOfBatch)<a name="line.1021"></a> |
| <span class="sourceLineNo">1022</span> throws Exception {<a name="line.1022"></a> |
| <span class="sourceLineNo">1023</span> // Appends and syncs are coming in order off the ringbuffer. We depend on this fact. We'll<a name="line.1023"></a> |
| <span class="sourceLineNo">1024</span> // add appends to dfsclient as they come in. Batching appends doesn't give any significant<a name="line.1024"></a> |
| <span class="sourceLineNo">1025</span> // benefit on measurement. Handler sync calls we will batch up. If we get an exception<a name="line.1025"></a> |
| <span class="sourceLineNo">1026</span> // appending an edit, we fail all subsequent appends and syncs with the same exception until<a name="line.1026"></a> |
| <span class="sourceLineNo">1027</span> // the WAL is reset. It is important that we not short-circuit and exit early this method.<a name="line.1027"></a> |
| <span class="sourceLineNo">1028</span> // It is important that we always go through the attainSafePoint on the end. Another thread,<a name="line.1028"></a> |
| <span class="sourceLineNo">1029</span> // the log roller may be waiting on a signal from us here and will just hang without it.<a name="line.1029"></a> |
| <span class="sourceLineNo">1030</span><a name="line.1030"></a> |
| <span class="sourceLineNo">1031</span> try {<a name="line.1031"></a> |
| <span class="sourceLineNo">1032</span> if (truck.type() == RingBufferTruck.Type.SYNC) {<a name="line.1032"></a> |
| <span class="sourceLineNo">1033</span> this.syncFutures[this.syncFuturesCount.getAndIncrement()] = truck.unloadSync();<a name="line.1033"></a> |
| <span class="sourceLineNo">1034</span> // Force flush of syncs if we are carrying a full complement of syncFutures.<a name="line.1034"></a> |
| <span class="sourceLineNo">1035</span> if (this.syncFuturesCount.get() == this.syncFutures.length) {<a name="line.1035"></a> |
| <span class="sourceLineNo">1036</span> endOfBatch = true;<a name="line.1036"></a> |
| <span class="sourceLineNo">1037</span> }<a name="line.1037"></a> |
| <span class="sourceLineNo">1038</span> } else if (truck.type() == RingBufferTruck.Type.APPEND) {<a name="line.1038"></a> |
| <span class="sourceLineNo">1039</span> FSWALEntry entry = truck.unloadAppend();<a name="line.1039"></a> |
| <span class="sourceLineNo">1040</span> //TODO handle htrace API change, see HBASE-18895<a name="line.1040"></a> |
| <span class="sourceLineNo">1041</span> //TraceScope scope = Trace.continueSpan(entry.detachSpan());<a name="line.1041"></a> |
| <span class="sourceLineNo">1042</span> try {<a name="line.1042"></a> |
| <span class="sourceLineNo">1043</span> if (this.exception != null) {<a name="line.1043"></a> |
| <span class="sourceLineNo">1044</span> // Return to keep processing events coming off the ringbuffer<a name="line.1044"></a> |
| <span class="sourceLineNo">1045</span> return;<a name="line.1045"></a> |
| <span class="sourceLineNo">1046</span> }<a name="line.1046"></a> |
| <span class="sourceLineNo">1047</span> append(entry);<a name="line.1047"></a> |
| <span class="sourceLineNo">1048</span> } catch (Exception e) {<a name="line.1048"></a> |
| <span class="sourceLineNo">1049</span> // Failed append. Record the exception.<a name="line.1049"></a> |
| <span class="sourceLineNo">1050</span> this.exception = e;<a name="line.1050"></a> |
| <span class="sourceLineNo">1051</span> // invoking cleanupOutstandingSyncsOnException when append failed with exception,<a name="line.1051"></a> |
| <span class="sourceLineNo">1052</span> // it will cleanup existing sync requests recorded in syncFutures but not offered to SyncRunner yet,<a name="line.1052"></a> |
| <span class="sourceLineNo">1053</span> // so there won't be any sync future left over if no further truck published to disruptor.<a name="line.1053"></a> |
| <span class="sourceLineNo">1054</span> cleanupOutstandingSyncsOnException(sequence,<a name="line.1054"></a> |
| <span class="sourceLineNo">1055</span> this.exception instanceof DamagedWALException ? this.exception<a name="line.1055"></a> |
| <span class="sourceLineNo">1056</span> : new DamagedWALException("On sync", this.exception));<a name="line.1056"></a> |
| <span class="sourceLineNo">1057</span> // Return to keep processing events coming off the ringbuffer<a name="line.1057"></a> |
| <span class="sourceLineNo">1058</span> return;<a name="line.1058"></a> |
| <span class="sourceLineNo">1059</span> } finally {<a name="line.1059"></a> |
| <span class="sourceLineNo">1060</span> entry.release();<a name="line.1060"></a> |
| <span class="sourceLineNo">1061</span> }<a name="line.1061"></a> |
| <span class="sourceLineNo">1062</span> } else {<a name="line.1062"></a> |
| <span class="sourceLineNo">1063</span> // What is this if not an append or sync. Fail all up to this!!!<a name="line.1063"></a> |
| <span class="sourceLineNo">1064</span> cleanupOutstandingSyncsOnException(sequence,<a name="line.1064"></a> |
| <span class="sourceLineNo">1065</span> new IllegalStateException("Neither append nor sync"));<a name="line.1065"></a> |
| <span class="sourceLineNo">1066</span> // Return to keep processing.<a name="line.1066"></a> |
| <span class="sourceLineNo">1067</span> return;<a name="line.1067"></a> |
| <span class="sourceLineNo">1068</span> }<a name="line.1068"></a> |
| <span class="sourceLineNo">1069</span><a name="line.1069"></a> |
| <span class="sourceLineNo">1070</span> // TODO: Check size and if big go ahead and call a sync if we have enough data.<a name="line.1070"></a> |
| <span class="sourceLineNo">1071</span> // This is a sync. If existing exception, fall through. Else look to see if batch.<a name="line.1071"></a> |
| <span class="sourceLineNo">1072</span> if (this.exception == null) {<a name="line.1072"></a> |
| <span class="sourceLineNo">1073</span> // If not a batch, return to consume more events from the ring buffer before proceeding;<a name="line.1073"></a> |
| <span class="sourceLineNo">1074</span> // we want to get up a batch of syncs and appends before we go do a filesystem sync.<a name="line.1074"></a> |
| <span class="sourceLineNo">1075</span> if (!endOfBatch || this.syncFuturesCount.get() <= 0) {<a name="line.1075"></a> |
| <span class="sourceLineNo">1076</span> return;<a name="line.1076"></a> |
| <span class="sourceLineNo">1077</span> }<a name="line.1077"></a> |
| <span class="sourceLineNo">1078</span> // syncRunnerIndex is bound to the range [0, Integer.MAX_INT - 1] as follows:<a name="line.1078"></a> |
| <span class="sourceLineNo">1079</span> // * The maximum value possible for syncRunners.length is Integer.MAX_INT<a name="line.1079"></a> |
| <span class="sourceLineNo">1080</span> // * syncRunnerIndex starts at 0 and is incremented only here<a name="line.1080"></a> |
| <span class="sourceLineNo">1081</span> // * after the increment, the value is bounded by the '%' operator to<a name="line.1081"></a> |
| <span class="sourceLineNo">1082</span> // [0, syncRunners.length), presuming the value was positive prior to<a name="line.1082"></a> |
| <span class="sourceLineNo">1083</span> // the '%' operator.<a name="line.1083"></a> |
| <span class="sourceLineNo">1084</span> // * after being bound to [0, Integer.MAX_INT - 1], the new value is stored in<a name="line.1084"></a> |
| <span class="sourceLineNo">1085</span> // syncRunnerIndex ensuring that it can't grow without bound and overflow.<a name="line.1085"></a> |
| <span class="sourceLineNo">1086</span> // * note that the value after the increment must be positive, because the most it<a name="line.1086"></a> |
| <span class="sourceLineNo">1087</span> // could have been prior was Integer.MAX_INT - 1 and we only increment by 1.<a name="line.1087"></a> |
| <span class="sourceLineNo">1088</span> this.syncRunnerIndex = (this.syncRunnerIndex + 1) % this.syncRunners.length;<a name="line.1088"></a> |
| <span class="sourceLineNo">1089</span> try {<a name="line.1089"></a> |
| <span class="sourceLineNo">1090</span> // Below expects that the offer 'transfers' responsibility for the outstanding syncs to<a name="line.1090"></a> |
| <span class="sourceLineNo">1091</span> // the syncRunner. We should never get an exception in here.<a name="line.1091"></a> |
| <span class="sourceLineNo">1092</span> this.syncRunners[this.syncRunnerIndex].offer(sequence, this.syncFutures,<a name="line.1092"></a> |
| <span class="sourceLineNo">1093</span> this.syncFuturesCount.get());<a name="line.1093"></a> |
| <span class="sourceLineNo">1094</span> } catch (Exception e) {<a name="line.1094"></a> |
| <span class="sourceLineNo">1095</span> // Should NEVER get here.<a name="line.1095"></a> |
| <span class="sourceLineNo">1096</span> requestLogRoll(ERROR);<a name="line.1096"></a> |
| <span class="sourceLineNo">1097</span> this.exception = new DamagedWALException("Failed offering sync", e);<a name="line.1097"></a> |
| <span class="sourceLineNo">1098</span> }<a name="line.1098"></a> |
| <span class="sourceLineNo">1099</span> }<a name="line.1099"></a> |
| <span class="sourceLineNo">1100</span> // We may have picked up an exception above trying to offer sync<a name="line.1100"></a> |
| <span class="sourceLineNo">1101</span> if (this.exception != null) {<a name="line.1101"></a> |
| <span class="sourceLineNo">1102</span> cleanupOutstandingSyncsOnException(sequence, this.exception instanceof DamagedWALException<a name="line.1102"></a> |
| <span class="sourceLineNo">1103</span> ? this.exception : new DamagedWALException("On sync", this.exception));<a name="line.1103"></a> |
| <span class="sourceLineNo">1104</span> }<a name="line.1104"></a> |
| <span class="sourceLineNo">1105</span> attainSafePoint(sequence);<a name="line.1105"></a> |
| <span class="sourceLineNo">1106</span> this.syncFuturesCount.set(0);<a name="line.1106"></a> |
| <span class="sourceLineNo">1107</span> } catch (Throwable t) {<a name="line.1107"></a> |
| <span class="sourceLineNo">1108</span> LOG.error("UNEXPECTED!!! syncFutures.length=" + this.syncFutures.length, t);<a name="line.1108"></a> |
| <span class="sourceLineNo">1109</span> }<a name="line.1109"></a> |
| <span class="sourceLineNo">1110</span> }<a name="line.1110"></a> |
| <span class="sourceLineNo">1111</span><a name="line.1111"></a> |
| <span class="sourceLineNo">1112</span> SafePointZigZagLatch attainSafePoint() {<a name="line.1112"></a> |
| <span class="sourceLineNo">1113</span> this.zigzagLatch = new SafePointZigZagLatch();<a name="line.1113"></a> |
| <span class="sourceLineNo">1114</span> return this.zigzagLatch;<a name="line.1114"></a> |
| <span class="sourceLineNo">1115</span> }<a name="line.1115"></a> |
| <span class="sourceLineNo">1116</span><a name="line.1116"></a> |
| <span class="sourceLineNo">1117</span> /**<a name="line.1117"></a> |
| <span class="sourceLineNo">1118</span> * Check if we should attain safe point. If so, go there and then wait till signalled before we<a name="line.1118"></a> |
| <span class="sourceLineNo">1119</span> * proceeding.<a name="line.1119"></a> |
| <span class="sourceLineNo">1120</span> */<a name="line.1120"></a> |
| <span class="sourceLineNo">1121</span> private void attainSafePoint(final long currentSequence) {<a name="line.1121"></a> |
| <span class="sourceLineNo">1122</span> if (this.zigzagLatch == null || !this.zigzagLatch.isCocked()) {<a name="line.1122"></a> |
| <span class="sourceLineNo">1123</span> return;<a name="line.1123"></a> |
| <span class="sourceLineNo">1124</span> }<a name="line.1124"></a> |
| <span class="sourceLineNo">1125</span> // If here, another thread is waiting on us to get to safe point. Don't leave it hanging.<a name="line.1125"></a> |
| <span class="sourceLineNo">1126</span> beforeWaitOnSafePoint();<a name="line.1126"></a> |
| <span class="sourceLineNo">1127</span> try {<a name="line.1127"></a> |
| <span class="sourceLineNo">1128</span> // Wait on outstanding syncers; wait for them to finish syncing (unless we've been<a name="line.1128"></a> |
| <span class="sourceLineNo">1129</span> // shutdown or unless our latch has been thrown because we have been aborted or unless<a name="line.1129"></a> |
| <span class="sourceLineNo">1130</span> // this WAL is broken and we can't get a sync/append to complete).<a name="line.1130"></a> |
| <span class="sourceLineNo">1131</span> while ((!this.shutdown && this.zigzagLatch.isCocked()<a name="line.1131"></a> |
| <span class="sourceLineNo">1132</span> && highestSyncedTxid.get() < currentSequence &&<a name="line.1132"></a> |
| <span class="sourceLineNo">1133</span> // We could be in here and all syncs are failing or failed. Check for this. Otherwise<a name="line.1133"></a> |
| <span class="sourceLineNo">1134</span> // we'll just be stuck here for ever. In other words, ensure there syncs running.<a name="line.1134"></a> |
| <span class="sourceLineNo">1135</span> isOutstandingSyncs())<a name="line.1135"></a> |
| <span class="sourceLineNo">1136</span> // Wait for all SyncRunners to finish their work so that we can replace the writer<a name="line.1136"></a> |
| <span class="sourceLineNo">1137</span> || isOutstandingSyncsFromRunners()) {<a name="line.1137"></a> |
| <span class="sourceLineNo">1138</span> synchronized (this.safePointWaiter) {<a name="line.1138"></a> |
| <span class="sourceLineNo">1139</span> this.safePointWaiter.wait(0, 1);<a name="line.1139"></a> |
| <span class="sourceLineNo">1140</span> }<a name="line.1140"></a> |
| <span class="sourceLineNo">1141</span> }<a name="line.1141"></a> |
| <span class="sourceLineNo">1142</span> // Tell waiting thread we've attained safe point. Can clear this.throwable if set here<a name="line.1142"></a> |
| <span class="sourceLineNo">1143</span> // because we know that next event through the ringbuffer will be going to a new WAL<a name="line.1143"></a> |
| <span class="sourceLineNo">1144</span> // after we do the zigzaglatch dance.<a name="line.1144"></a> |
| <span class="sourceLineNo">1145</span> this.exception = null;<a name="line.1145"></a> |
| <span class="sourceLineNo">1146</span> this.zigzagLatch.safePointAttained();<a name="line.1146"></a> |
| <span class="sourceLineNo">1147</span> } catch (InterruptedException e) {<a name="line.1147"></a> |
| <span class="sourceLineNo">1148</span> LOG.warn("Interrupted ", e);<a name="line.1148"></a> |
| <span class="sourceLineNo">1149</span> Thread.currentThread().interrupt();<a name="line.1149"></a> |
| <span class="sourceLineNo">1150</span> }<a name="line.1150"></a> |
| <span class="sourceLineNo">1151</span> }<a name="line.1151"></a> |
| <span class="sourceLineNo">1152</span><a name="line.1152"></a> |
| <span class="sourceLineNo">1153</span> /**<a name="line.1153"></a> |
| <span class="sourceLineNo">1154</span> * Append to the WAL. Does all CP and WAL listener calls.<a name="line.1154"></a> |
| <span class="sourceLineNo">1155</span> */<a name="line.1155"></a> |
| <span class="sourceLineNo">1156</span> void append(final FSWALEntry entry) throws Exception {<a name="line.1156"></a> |
| <span class="sourceLineNo">1157</span> try {<a name="line.1157"></a> |
| <span class="sourceLineNo">1158</span> FSHLog.this.appendEntry(writer, entry);<a name="line.1158"></a> |
| <span class="sourceLineNo">1159</span> } catch (Exception e) {<a name="line.1159"></a> |
| <span class="sourceLineNo">1160</span> String msg = "Append sequenceId=" + entry.getKey().getSequenceId()<a name="line.1160"></a> |
| <span class="sourceLineNo">1161</span> + ", requesting roll of WAL";<a name="line.1161"></a> |
| <span class="sourceLineNo">1162</span> LOG.warn(msg, e);<a name="line.1162"></a> |
| <span class="sourceLineNo">1163</span> requestLogRoll(ERROR);<a name="line.1163"></a> |
| <span class="sourceLineNo">1164</span> throw new DamagedWALException(msg, e);<a name="line.1164"></a> |
| <span class="sourceLineNo">1165</span> }<a name="line.1165"></a> |
| <span class="sourceLineNo">1166</span> }<a name="line.1166"></a> |
| <span class="sourceLineNo">1167</span><a name="line.1167"></a> |
| <span class="sourceLineNo">1168</span> @Override<a name="line.1168"></a> |
| <span class="sourceLineNo">1169</span> public void onStart() {<a name="line.1169"></a> |
| <span class="sourceLineNo">1170</span> for (SyncRunner syncRunner : this.syncRunners) {<a name="line.1170"></a> |
| <span class="sourceLineNo">1171</span> syncRunner.start();<a name="line.1171"></a> |
| <span class="sourceLineNo">1172</span> }<a name="line.1172"></a> |
| <span class="sourceLineNo">1173</span> }<a name="line.1173"></a> |
| <span class="sourceLineNo">1174</span><a name="line.1174"></a> |
| <span class="sourceLineNo">1175</span> @Override<a name="line.1175"></a> |
| <span class="sourceLineNo">1176</span> public void onShutdown() {<a name="line.1176"></a> |
| <span class="sourceLineNo">1177</span> for (SyncRunner syncRunner : this.syncRunners) {<a name="line.1177"></a> |
| <span class="sourceLineNo">1178</span> syncRunner.interrupt();<a name="line.1178"></a> |
| <span class="sourceLineNo">1179</span> }<a name="line.1179"></a> |
| <span class="sourceLineNo">1180</span> }<a name="line.1180"></a> |
| <span class="sourceLineNo">1181</span> }<a name="line.1181"></a> |
| <span class="sourceLineNo">1182</span><a name="line.1182"></a> |
| <span class="sourceLineNo">1183</span> /**<a name="line.1183"></a> |
| <span class="sourceLineNo">1184</span> * This method gets the pipeline for the current WAL.<a name="line.1184"></a> |
| <span class="sourceLineNo">1185</span> */<a name="line.1185"></a> |
| <span class="sourceLineNo">1186</span> @Override<a name="line.1186"></a> |
| <span class="sourceLineNo">1187</span> DatanodeInfo[] getPipeline() {<a name="line.1187"></a> |
| <span class="sourceLineNo">1188</span> if (this.hdfs_out != null) {<a name="line.1188"></a> |
| <span class="sourceLineNo">1189</span> if (this.hdfs_out.getWrappedStream() instanceof DFSOutputStream) {<a name="line.1189"></a> |
| <span class="sourceLineNo">1190</span> return ((DFSOutputStream) this.hdfs_out.getWrappedStream()).getPipeline();<a name="line.1190"></a> |
| <span class="sourceLineNo">1191</span> }<a name="line.1191"></a> |
| <span class="sourceLineNo">1192</span> }<a name="line.1192"></a> |
| <span class="sourceLineNo">1193</span> return new DatanodeInfo[0];<a name="line.1193"></a> |
| <span class="sourceLineNo">1194</span> }<a name="line.1194"></a> |
| <span class="sourceLineNo">1195</span><a name="line.1195"></a> |
| <span class="sourceLineNo">1196</span> @VisibleForTesting<a name="line.1196"></a> |
| <span class="sourceLineNo">1197</span> Writer getWriter() {<a name="line.1197"></a> |
| <span class="sourceLineNo">1198</span> return this.writer;<a name="line.1198"></a> |
| <span class="sourceLineNo">1199</span> }<a name="line.1199"></a> |
| <span class="sourceLineNo">1200</span><a name="line.1200"></a> |
| <span class="sourceLineNo">1201</span> @VisibleForTesting<a name="line.1201"></a> |
| <span class="sourceLineNo">1202</span> void setWriter(Writer writer) {<a name="line.1202"></a> |
| <span class="sourceLineNo">1203</span> this.writer = writer;<a name="line.1203"></a> |
| <span class="sourceLineNo">1204</span> }<a name="line.1204"></a> |
| <span class="sourceLineNo">1205</span>}<a name="line.1205"></a> |
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| </pre> |
| </div> |
| </body> |
| </html> |
