http://git-wip-us.apache.org/repos/asf/hbase-site/blob/9eba7fcf/devapidocs/src-html/org/apache/hadoop/hbase/coordination/ZkSplitLogWorkerCoordination.html ---------------------------------------------------------------------- diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/coordination/ZkSplitLogWorkerCoordination.html b/devapidocs/src-html/org/apache/hadoop/hbase/coordination/ZkSplitLogWorkerCoordination.html index 5eefe01..59063f5 100644 --- a/devapidocs/src-html/org/apache/hadoop/hbase/coordination/ZkSplitLogWorkerCoordination.html +++ b/devapidocs/src-html/org/apache/hadoop/hbase/coordination/ZkSplitLogWorkerCoordination.html @@ -58,606 +58,607 @@ <span class="sourceLineNo">050</span>import org.apache.hadoop.hbase.util.CancelableProgressable;<a name="line.50"></a> <span class="sourceLineNo">051</span>import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;<a name="line.51"></a> <span class="sourceLineNo">052</span>import org.apache.hadoop.hbase.wal.AbstractFSWALProvider;<a name="line.52"></a> -<span class="sourceLineNo">053</span>import org.apache.hadoop.hbase.zookeeper.ZKSplitLog;<a name="line.53"></a> -<span class="sourceLineNo">054</span>import org.apache.hadoop.hbase.zookeeper.ZKUtil;<a name="line.54"></a> -<span class="sourceLineNo">055</span>import org.apache.hadoop.hbase.zookeeper.ZooKeeperListener;<a name="line.55"></a> -<span class="sourceLineNo">056</span>import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;<a name="line.56"></a> -<span class="sourceLineNo">057</span>import org.apache.hadoop.util.StringUtils;<a name="line.57"></a> -<span class="sourceLineNo">058</span>import org.apache.zookeeper.AsyncCallback;<a name="line.58"></a> -<span class="sourceLineNo">059</span>import org.apache.zookeeper.KeeperException;<a name="line.59"></a> -<span class="sourceLineNo">060</span>import org.apache.zookeeper.data.Stat;<a name="line.60"></a> -<span class="sourceLineNo">061</span><a name="line.61"></a> -<span class="sourceLineNo">062</span>/**<a name="line.62"></a> -<span class="sourceLineNo">063</span> * ZooKeeper based implementation of {@link SplitLogWorkerCoordination}<a name="line.63"></a> -<span class="sourceLineNo">064</span> * It listen for changes in ZooKeeper and<a name="line.64"></a> -<span class="sourceLineNo">065</span> *<a name="line.65"></a> -<span class="sourceLineNo">066</span> */<a name="line.66"></a> -<span class="sourceLineNo">067</span>@InterfaceAudience.Private<a name="line.67"></a> -<span class="sourceLineNo">068</span>public class ZkSplitLogWorkerCoordination extends ZooKeeperListener implements<a name="line.68"></a> -<span class="sourceLineNo">069</span> SplitLogWorkerCoordination {<a name="line.69"></a> -<span class="sourceLineNo">070</span><a name="line.70"></a> -<span class="sourceLineNo">071</span> private static final Log LOG = LogFactory.getLog(ZkSplitLogWorkerCoordination.class);<a name="line.71"></a> -<span class="sourceLineNo">072</span><a name="line.72"></a> -<span class="sourceLineNo">073</span> private static final int checkInterval = 5000; // 5 seconds<a name="line.73"></a> -<span class="sourceLineNo">074</span> private static final int FAILED_TO_OWN_TASK = -1;<a name="line.74"></a> -<span class="sourceLineNo">075</span><a name="line.75"></a> -<span class="sourceLineNo">076</span> private SplitLogWorker worker;<a name="line.76"></a> -<span class="sourceLineNo">077</span><a name="line.77"></a> -<span class="sourceLineNo">078</span> private TaskExecutor splitTaskExecutor;<a name="line.78"></a> -<span class="sourceLineNo">079</span><a name="line.79"></a> -<span class="sourceLineNo">080</span> private final Object taskReadyLock = new Object();<a name="line.80"></a> -<span class="sourceLineNo">081</span> private AtomicInteger taskReadySeq = new AtomicInteger(0);<a name="line.81"></a> -<span class="sourceLineNo">082</span> private volatile String currentTask = null;<a name="line.82"></a> -<span class="sourceLineNo">083</span> private int currentVersion;<a name="line.83"></a> -<span class="sourceLineNo">084</span> private volatile boolean shouldStop = false;<a name="line.84"></a> -<span class="sourceLineNo">085</span> private final Object grabTaskLock = new Object();<a name="line.85"></a> -<span class="sourceLineNo">086</span> private boolean workerInGrabTask = false;<a name="line.86"></a> -<span class="sourceLineNo">087</span> private int reportPeriod;<a name="line.87"></a> -<span class="sourceLineNo">088</span> private RegionServerServices server = null;<a name="line.88"></a> -<span class="sourceLineNo">089</span> protected final AtomicInteger tasksInProgress = new AtomicInteger(0);<a name="line.89"></a> -<span class="sourceLineNo">090</span> private int maxConcurrentTasks = 0;<a name="line.90"></a> -<span class="sourceLineNo">091</span><a name="line.91"></a> -<span class="sourceLineNo">092</span> private final ZkCoordinatedStateManager manager;<a name="line.92"></a> -<span class="sourceLineNo">093</span><a name="line.93"></a> -<span class="sourceLineNo">094</span> public ZkSplitLogWorkerCoordination(ZkCoordinatedStateManager zkCoordinatedStateManager,<a name="line.94"></a> -<span class="sourceLineNo">095</span> ZooKeeperWatcher watcher) {<a name="line.95"></a> -<span class="sourceLineNo">096</span> super(watcher);<a name="line.96"></a> -<span class="sourceLineNo">097</span> manager = zkCoordinatedStateManager;<a name="line.97"></a> -<span class="sourceLineNo">098</span><a name="line.98"></a> -<span class="sourceLineNo">099</span> }<a name="line.99"></a> -<span class="sourceLineNo">100</span><a name="line.100"></a> -<span class="sourceLineNo">101</span> /**<a name="line.101"></a> -<span class="sourceLineNo">102</span> * Override handler from {@link ZooKeeperListener}<a name="line.102"></a> -<span class="sourceLineNo">103</span> */<a name="line.103"></a> -<span class="sourceLineNo">104</span> @Override<a name="line.104"></a> -<span class="sourceLineNo">105</span> public void nodeChildrenChanged(String path) {<a name="line.105"></a> -<span class="sourceLineNo">106</span> if (path.equals(watcher.znodePaths.splitLogZNode)) {<a name="line.106"></a> -<span class="sourceLineNo">107</span> if (LOG.isTraceEnabled()) LOG.trace("tasks arrived or departed on " + path);<a name="line.107"></a> -<span class="sourceLineNo">108</span> synchronized (taskReadyLock) {<a name="line.108"></a> -<span class="sourceLineNo">109</span> this.taskReadySeq.incrementAndGet();<a name="line.109"></a> -<span class="sourceLineNo">110</span> taskReadyLock.notify();<a name="line.110"></a> -<span class="sourceLineNo">111</span> }<a name="line.111"></a> -<span class="sourceLineNo">112</span> }<a name="line.112"></a> -<span class="sourceLineNo">113</span> }<a name="line.113"></a> -<span class="sourceLineNo">114</span><a name="line.114"></a> -<span class="sourceLineNo">115</span> /**<a name="line.115"></a> -<span class="sourceLineNo">116</span> * Override handler from {@link ZooKeeperListener}<a name="line.116"></a> -<span class="sourceLineNo">117</span> */<a name="line.117"></a> -<span class="sourceLineNo">118</span> @Override<a name="line.118"></a> -<span class="sourceLineNo">119</span> public void nodeDataChanged(String path) {<a name="line.119"></a> -<span class="sourceLineNo">120</span> // there will be a self generated dataChanged event every time attemptToOwnTask()<a name="line.120"></a> -<span class="sourceLineNo">121</span> // heartbeats the task znode by upping its version<a name="line.121"></a> -<span class="sourceLineNo">122</span> synchronized (grabTaskLock) {<a name="line.122"></a> -<span class="sourceLineNo">123</span> if (workerInGrabTask) {<a name="line.123"></a> -<span class="sourceLineNo">124</span> // currentTask can change<a name="line.124"></a> -<span class="sourceLineNo">125</span> String taskpath = currentTask;<a name="line.125"></a> -<span class="sourceLineNo">126</span> if (taskpath != null && taskpath.equals(path)) {<a name="line.126"></a> -<span class="sourceLineNo">127</span> getDataSetWatchAsync();<a name="line.127"></a> -<span class="sourceLineNo">128</span> }<a name="line.128"></a> -<span class="sourceLineNo">129</span> }<a name="line.129"></a> -<span class="sourceLineNo">130</span> }<a name="line.130"></a> -<span class="sourceLineNo">131</span> }<a name="line.131"></a> -<span class="sourceLineNo">132</span><a name="line.132"></a> -<span class="sourceLineNo">133</span> /**<a name="line.133"></a> -<span class="sourceLineNo">134</span> * Override setter from {@link SplitLogWorkerCoordination}<a name="line.134"></a> -<span class="sourceLineNo">135</span> */<a name="line.135"></a> -<span class="sourceLineNo">136</span> @Override<a name="line.136"></a> -<span class="sourceLineNo">137</span> public void init(RegionServerServices server, Configuration conf,<a name="line.137"></a> -<span class="sourceLineNo">138</span> TaskExecutor splitExecutor, SplitLogWorker worker) {<a name="line.138"></a> -<span class="sourceLineNo">139</span> this.server = server;<a name="line.139"></a> -<span class="sourceLineNo">140</span> this.worker = worker;<a name="line.140"></a> -<span class="sourceLineNo">141</span> this.splitTaskExecutor = splitExecutor;<a name="line.141"></a> -<span class="sourceLineNo">142</span> maxConcurrentTasks = conf.getInt("hbase.regionserver.wal.max.splitters", DEFAULT_MAX_SPLITTERS);<a name="line.142"></a> -<span class="sourceLineNo">143</span> reportPeriod =<a name="line.143"></a> -<span class="sourceLineNo">144</span> conf.getInt("hbase.splitlog.report.period",<a name="line.144"></a> -<span class="sourceLineNo">145</span> conf.getInt(HConstants.HBASE_SPLITLOG_MANAGER_TIMEOUT,<a name="line.145"></a> -<span class="sourceLineNo">146</span> ZKSplitLogManagerCoordination.DEFAULT_TIMEOUT) / 3);<a name="line.146"></a> -<span class="sourceLineNo">147</span> }<a name="line.147"></a> -<span class="sourceLineNo">148</span><a name="line.148"></a> -<span class="sourceLineNo">149</span> /* Support functions for ZooKeeper async callback */<a name="line.149"></a> -<span class="sourceLineNo">150</span><a name="line.150"></a> -<span class="sourceLineNo">151</span> void getDataSetWatchFailure(String path) {<a name="line.151"></a> -<span class="sourceLineNo">152</span> synchronized (grabTaskLock) {<a name="line.152"></a> -<span class="sourceLineNo">153</span> if (workerInGrabTask) {<a name="line.153"></a> -<span class="sourceLineNo">154</span> // currentTask can change but that's ok<a name="line.154"></a> -<span class="sourceLineNo">155</span> String taskpath = currentTask;<a name="line.155"></a> -<span class="sourceLineNo">156</span> if (taskpath != null && taskpath.equals(path)) {<a name="line.156"></a> -<span class="sourceLineNo">157</span> LOG.info("retrying data watch on " + path);<a name="line.157"></a> -<span class="sourceLineNo">158</span> SplitLogCounters.tot_wkr_get_data_retry.incrementAndGet();<a name="line.158"></a> -<span class="sourceLineNo">159</span> getDataSetWatchAsync();<a name="line.159"></a> -<span class="sourceLineNo">160</span> } else {<a name="line.160"></a> -<span class="sourceLineNo">161</span> // no point setting a watch on the task which this worker is not<a name="line.161"></a> -<span class="sourceLineNo">162</span> // working upon anymore<a name="line.162"></a> -<span class="sourceLineNo">163</span> }<a name="line.163"></a> -<span class="sourceLineNo">164</span> }<a name="line.164"></a> -<span class="sourceLineNo">165</span> }<a name="line.165"></a> -<span class="sourceLineNo">166</span> }<a name="line.166"></a> -<span class="sourceLineNo">167</span><a name="line.167"></a> -<span class="sourceLineNo">168</span> public void getDataSetWatchAsync() {<a name="line.168"></a> -<span class="sourceLineNo">169</span> watcher.getRecoverableZooKeeper().getZooKeeper()<a name="line.169"></a> -<span class="sourceLineNo">170</span> .getData(currentTask, watcher, new GetDataAsyncCallback(), null);<a name="line.170"></a> -<span class="sourceLineNo">171</span> SplitLogCounters.tot_wkr_get_data_queued.incrementAndGet();<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> void getDataSetWatchSuccess(String path, byte[] data) {<a name="line.174"></a> -<span class="sourceLineNo">175</span> SplitLogTask slt;<a name="line.175"></a> -<span class="sourceLineNo">176</span> try {<a name="line.176"></a> -<span class="sourceLineNo">177</span> slt = SplitLogTask.parseFrom(data);<a name="line.177"></a> -<span class="sourceLineNo">178</span> } catch (DeserializationException e) {<a name="line.178"></a> -<span class="sourceLineNo">179</span> LOG.warn("Failed parse", e);<a name="line.179"></a> -<span class="sourceLineNo">180</span> return;<a name="line.180"></a> -<span class="sourceLineNo">181</span> }<a name="line.181"></a> -<span class="sourceLineNo">182</span> synchronized (grabTaskLock) {<a name="line.182"></a> -<span class="sourceLineNo">183</span> if (workerInGrabTask) {<a name="line.183"></a> -<span class="sourceLineNo">184</span> // currentTask can change but that's ok<a name="line.184"></a> -<span class="sourceLineNo">185</span> String taskpath = currentTask;<a name="line.185"></a> -<span class="sourceLineNo">186</span> if (taskpath != null && taskpath.equals(path)) {<a name="line.186"></a> -<span class="sourceLineNo">187</span> ServerName serverName = manager.getServer().getServerName();<a name="line.187"></a> -<span class="sourceLineNo">188</span> // have to compare data. cannot compare version because then there<a name="line.188"></a> -<span class="sourceLineNo">189</span> // will be race with attemptToOwnTask()<a name="line.189"></a> -<span class="sourceLineNo">190</span> // cannot just check whether the node has been transitioned to<a name="line.190"></a> -<span class="sourceLineNo">191</span> // UNASSIGNED because by the time 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class="sourceLineNo">201</span> }<a name="line.201"></a> -<span class="sourceLineNo">202</span> }<a name="line.202"></a> -<span class="sourceLineNo">203</span> }<a name="line.203"></a> -<span class="sourceLineNo">204</span><a name="line.204"></a> -<span class="sourceLineNo">205</span> /**<a name="line.205"></a> -<span class="sourceLineNo">206</span> * try to grab a 'lock' on the task zk node to own and execute the task.<a name="line.206"></a> -<span class="sourceLineNo">207</span> * <p><a name="line.207"></a> -<span class="sourceLineNo">208</span> * @param path zk node for the task<a name="line.208"></a> -<span class="sourceLineNo">209</span> */<a name="line.209"></a> -<span class="sourceLineNo">210</span> private void grabTask(String path) {<a name="line.210"></a> -<span class="sourceLineNo">211</span> Stat stat = new Stat();<a name="line.211"></a> -<span class="sourceLineNo">212</span> byte[] data;<a name="line.212"></a> -<span class="sourceLineNo">213</span> synchronized (grabTaskLock) {<a name="line.213"></a> -<span class="sourceLineNo">214</span> currentTask = path;<a name="line.214"></a> -<span class="sourceLineNo">215</span> workerInGrabTask = true;<a name="line.215"></a> -<span class="sourceLineNo">216</span> if (Thread.interrupted()) {<a name="line.216"></a> -<span class="sourceLineNo">217</span> return;<a name="line.217"></a> -<span class="sourceLineNo">218</span> }<a name="line.218"></a> -<span class="sourceLineNo">219</span> }<a name="line.219"></a> -<span class="sourceLineNo">220</span> try {<a name="line.220"></a> -<span class="sourceLineNo">221</span> try {<a name="line.221"></a> -<span class="sourceLineNo">222</span> if ((data = ZKUtil.getDataNoWatch(watcher, path, stat)) == null) {<a name="line.222"></a> -<span class="sourceLineNo">223</span> SplitLogCounters.tot_wkr_failed_to_grab_task_no_data.incrementAndGet();<a name="line.223"></a> -<span class="sourceLineNo">224</span> return;<a name="line.224"></a> -<span class="sourceLineNo">225</span> }<a name="line.225"></a> -<span class="sourceLineNo">226</span> } catch (KeeperException e) {<a name="line.226"></a> -<span class="sourceLineNo">227</span> LOG.warn("Failed to get data for znode " + path, e);<a name="line.227"></a> -<span class="sourceLineNo">228</span> SplitLogCounters.tot_wkr_failed_to_grab_task_exception.incrementAndGet();<a name="line.228"></a> -<span class="sourceLineNo">229</span> return;<a name="line.229"></a> -<span class="sourceLineNo">230</span> }<a name="line.230"></a> -<span class="sourceLineNo">231</span> SplitLogTask slt;<a name="line.231"></a> -<span class="sourceLineNo">232</span> try {<a name="line.232"></a> -<span class="sourceLineNo">233</span> slt = SplitLogTask.parseFrom(data);<a name="line.233"></a> -<span class="sourceLineNo">234</span> } catch (DeserializationException e) {<a name="line.234"></a> -<span class="sourceLineNo">235</span> LOG.warn("Failed parse data for znode " + path, e);<a name="line.235"></a> 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class="sourceLineNo">247</span> if (currentVersion < 0) {<a name="line.247"></a> -<span class="sourceLineNo">248</span> SplitLogCounters.tot_wkr_failed_to_grab_task_lost_race.incrementAndGet();<a name="line.248"></a> -<span class="sourceLineNo">249</span> return;<a name="line.249"></a> -<span class="sourceLineNo">250</span> }<a name="line.250"></a> -<span class="sourceLineNo">251</span><a name="line.251"></a> -<span class="sourceLineNo">252</span> if (ZKSplitLog.isRescanNode(watcher, currentTask)) {<a name="line.252"></a> -<span class="sourceLineNo">253</span> ZkSplitLogWorkerCoordination.ZkSplitTaskDetails splitTaskDetails =<a name="line.253"></a> -<span class="sourceLineNo">254</span> new ZkSplitLogWorkerCoordination.ZkSplitTaskDetails();<a name="line.254"></a> -<span class="sourceLineNo">255</span> splitTaskDetails.setTaskNode(currentTask);<a name="line.255"></a> -<span class="sourceLineNo">256</span> splitTaskDetails.setCurTaskZKVersion(new MutableInt(currentVersion));<a 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slt.getMode(), currentVersion, reportPeriod);<a name="line.267"></a> -<span class="sourceLineNo">268</span><a name="line.268"></a> -<span class="sourceLineNo">269</span> // after a successful submit, sleep a little bit to allow other RSs to grab the rest tasks<a name="line.269"></a> -<span class="sourceLineNo">270</span> try {<a name="line.270"></a> -<span class="sourceLineNo">271</span> int sleepTime = RandomUtils.nextInt(500) + 500;<a name="line.271"></a> -<span class="sourceLineNo">272</span> Thread.sleep(sleepTime);<a name="line.272"></a> -<span class="sourceLineNo">273</span> } catch (InterruptedException e) {<a name="line.273"></a> -<span class="sourceLineNo">274</span> LOG.warn("Interrupted while yielding for other region servers", e);<a name="line.274"></a> -<span class="sourceLineNo">275</span> Thread.currentThread().interrupt();<a name="line.275"></a> -<span class="sourceLineNo">276</span> }<a name="line.276"></a> -<span class="sourceLineNo">277</span> } finally {<a 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class="sourceLineNo">300</span> public boolean progress() {<a name="line.300"></a> -<span class="sourceLineNo">301</span> long t = EnvironmentEdgeManager.currentTime();<a name="line.301"></a> -<span class="sourceLineNo">302</span> if ((t - last_report_at) > reportPeriod) {<a name="line.302"></a> -<span class="sourceLineNo">303</span> last_report_at = t;<a name="line.303"></a> -<span class="sourceLineNo">304</span> int latestZKVersion =<a name="line.304"></a> -<span class="sourceLineNo">305</span> attemptToOwnTask(false, watcher, server.getServerName(), curTask,<a name="line.305"></a> -<span class="sourceLineNo">306</span> mode, zkVersion.intValue());<a name="line.306"></a> -<span class="sourceLineNo">307</span> if (latestZKVersion < 0) {<a name="line.307"></a> -<span class="sourceLineNo">308</span> LOG.warn("Failed to heartbeat the task" + curTask);<a name="line.308"></a> -<span class="sourceLineNo">309</span> return false;<a name="line.309"></a> -<span class="sourceLineNo">310</span> 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i < paths.size(); i++) {<a name="line.420"></a> -<span class="sourceLineNo">421</span> if (AbstractFSWALProvider.isMetaFile(paths.get(i))) {<a name="line.421"></a> -<span class="sourceLineNo">422</span> offset = i;<a name="line.422"></a> -<span class="sourceLineNo">423</span> break;<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> int numTasks = paths.size();<a name="line.426"></a> -<span class="sourceLineNo">427</span> for (int i = 0; i < numTasks; i++) {<a name="line.427"></a> -<span class="sourceLineNo">428</span> int idx = (i + offset) % paths.size();<a name="line.428"></a> -<span class="sourceLineNo">429</span> // don't call ZKSplitLog.getNodeName() because that will lead to<a name="line.429"></a> -<span class="sourceLineNo">430</span> // double encoding of the path name<a name="line.430"></a> -<span class="sourceLineNo">431</span> if (this.calculateAvailableSplitters(numTasks) > 0) {<a name="line.431"></a> -<span class="sourceLineNo">432</span> grabTask(ZKUtil.joinZNode(watcher.znodePaths.splitLogZNode, paths.get(idx)));<a name="line.432"></a> -<span class="sourceLineNo">433</span> } else {<a name="line.433"></a> -<span class="sourceLineNo">434</span> LOG.debug("Current region server " + server.getServerName() + " has "<a name="line.434"></a> -<span class="sourceLineNo">435</span> + this.tasksInProgress.get() + " tasks in progress and can't take more.");<a name="line.435"></a> -<span class="sourceLineNo">436</span> break;<a name="line.436"></a> -<span class="sourceLineNo">437</span> }<a name="line.437"></a> -<span class="sourceLineNo">438</span> if (shouldStop) {<a name="line.438"></a> -<span class="sourceLineNo">439</span> return;<a name="line.439"></a> -<span class="sourceLineNo">440</span> }<a name="line.440"></a> -<span class="sourceLineNo">441</span> }<a name="line.441"></a> -<span class="sourceLineNo">442</span> SplitLogCounters.tot_wkr_task_grabing.incrementAndGet();<a name="line.442"></a> -<span class="sourceLineNo">443</span> synchronized (taskReadyLock) {<a name="line.443"></a> -<span class="sourceLineNo">444</span> while (seq_start == taskReadySeq.get()) {<a name="line.444"></a> -<span class="sourceLineNo">445</span> taskReadyLock.wait(checkInterval);<a name="line.445"></a> -<span class="sourceLineNo">446</span> if (server != null) {<a name="line.446"></a> -<span class="sourceLineNo">447</span> // check to see if we have stale recovering regions in our internal memory state<a name="line.447"></a> -<span class="sourceLineNo">448</span> Map<String, Region> recoveringRegions = server.getRecoveringRegions();<a name="line.448"></a> -<span class="sourceLineNo">449</span> if (!recoveringRegions.isEmpty()) {<a name="line.449"></a> -<span class="sourceLineNo">450</span> // Make a local copy to prevent ConcurrentModificationException when other threads<a name="line.450"></a> -<span class="sourceLineNo">451</span> // modify recoveringRegions<a name="line.451"></a> -<span class="sourceLineNo">452</span> List<String> tmpCopy = new ArrayList<>(recoveringRegions.keySet());<a name="line.452"></a> -<span class="sourceLineNo">453</span> int listSize = tmpCopy.size();<a name="line.453"></a> -<span class="sourceLineNo">454</span> for (int i = 0; i < listSize; i++) {<a name="line.454"></a> -<span class="sourceLineNo">455</span> String region = tmpCopy.get(i);<a name="line.455"></a> -<span class="sourceLineNo">456</span> String nodePath = ZKUtil.joinZNode(watcher.znodePaths.recoveringRegionsZNode,<a name="line.456"></a> -<span class="sourceLineNo">457</span> region);<a name="line.457"></a> -<span class="sourceLineNo">458</span> try {<a name="line.458"></a> -<span class="sourceLineNo">459</span> if (ZKUtil.checkExists(watcher, nodePath) == -1) {<a name="line.459"></a> -<span class="sourceLineNo">460</span> server.getExecutorService().submit(<a name="line.460"></a> -<span class="sourceLineNo">461</span> new FinishRegionRecoveringHandler(server, region, nodePath));<a name="line.461"></a> -<span class="sourceLineNo">462</span> } else {<a name="line.462"></a> -<span class="sourceLineNo">463</span> // current check is a defensive(or redundant) mechanism to prevent us from<a name="line.463"></a> -<span class="sourceLineNo">464</span> // having stale recovering regions in our internal RS memory state while<a name="line.464"></a> -<span class="sourceLineNo">465</span> // zookeeper(source of truth) says differently. 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-<span class="sourceLineNo">499</span> + " after sleep for " + sleepTime + "ms!");<a name="line.499"></a> -<span class="sourceLineNo">500</span> Thread.sleep(sleepTime);<a name="line.500"></a> -<span class="sourceLineNo">501</span> }<a name="line.501"></a> -<span class="sourceLineNo">502</span> return childrenPaths;<a name="line.502"></a> -<span class="sourceLineNo">503</span> }<a name="line.503"></a> -<span class="sourceLineNo">504</span><a name="line.504"></a> -<span class="sourceLineNo">505</span> @Override<a name="line.505"></a> -<span class="sourceLineNo">506</span> public void markCorrupted(Path rootDir, String name, FileSystem fs) {<a name="line.506"></a> -<span class="sourceLineNo">507</span> ZKSplitLog.markCorrupted(rootDir, name, fs);<a name="line.507"></a> -<span class="sourceLineNo">508</span> }<a name="line.508"></a> -<span class="sourceLineNo">509</span><a name="line.509"></a> -<span class="sourceLineNo">510</span> @Override<a name="line.510"></a> -<span class="sourceLineNo">511</span> public boolean isReady() throws InterruptedException {<a name="line.511"></a> -<span class="sourceLineNo">512</span> int result = -1;<a name="line.512"></a> -<span class="sourceLineNo">513</span> try {<a name="line.513"></a> -<span class="sourceLineNo">514</span> result = ZKUtil.checkExists(watcher, watcher.znodePaths.splitLogZNode);<a name="line.514"></a> -<span class="sourceLineNo">515</span> } catch (KeeperException e) {<a name="line.515"></a> -<span class="sourceLineNo">516</span> // ignore<a name="line.516"></a> -<span class="sourceLineNo">517</span> LOG.warn("Exception when checking for " + watcher.znodePaths.splitLogZNode<a name="line.517"></a> -<span class="sourceLineNo">518</span> + " ... retrying", e);<a name="line.518"></a> -<span class="sourceLineNo">519</span> }<a name="line.519"></a> -<span class="sourceLineNo">520</span> if (result == -1) {<a name="line.520"></a> -<span class="sourceLineNo">521</span> LOG.info(watcher.znodePaths.splitLogZNode<a name="line.521"></a> -<span class="sourceLineNo">522</span> + " znode does not exist, waiting for master to create");<a name="line.522"></a> -<span class="sourceLineNo">523</span> Thread.sleep(1000);<a name="line.523"></a> -<span class="sourceLineNo">524</span> }<a name="line.524"></a> -<span class="sourceLineNo">525</span> return (result != -1);<a name="line.525"></a> -<span class="sourceLineNo">526</span> }<a name="line.526"></a> -<span class="sourceLineNo">527</span><a name="line.527"></a> -<span class="sourceLineNo">528</span> @Override<a name="line.528"></a> -<span class="sourceLineNo">529</span> public int getTaskReadySeq() {<a name="line.529"></a> -<span class="sourceLineNo">530</span> return taskReadySeq.get();<a name="line.530"></a> -<span class="sourceLineNo">531</span> }<a name="line.531"></a> -<span class="sourceLineNo">532</span><a name="line.532"></a> -<span class="sourceLineNo">533</span> @Override<a name="line.533"></a> -<span class="sourceLineNo">534</span> public void registerListener() {<a name="line.534"></a> -<span class="sourceLineNo">535</span> watcher.registerListener(this);<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> @Override<a name="line.538"></a> -<span class="sourceLineNo">539</span> public void removeListener() {<a name="line.539"></a> -<span class="sourceLineNo">540</span> watcher.unregisterListener(this);<a name="line.540"></a> -<span class="sourceLineNo">541</span> }<a name="line.541"></a> -<span class="sourceLineNo">542</span><a name="line.542"></a> +<span class="sourceLineNo">053</span>import org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper;<a name="line.53"></a> +<span class="sourceLineNo">054</span>import org.apache.hadoop.hbase.zookeeper.ZKSplitLog;<a name="line.54"></a> +<span class="sourceLineNo">055</span>import org.apache.hadoop.hbase.zookeeper.ZKUtil;<a name="line.55"></a> +<span class="sourceLineNo">056</span>import org.apache.hadoop.hbase.zookeeper.ZooKeeperListener;<a name="line.56"></a> +<span class="sourceLineNo">057</span>import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;<a name="line.57"></a> +<span class="sourceLineNo">058</span>import org.apache.hadoop.util.StringUtils;<a name="line.58"></a> +<span class="sourceLineNo">059</span>import org.apache.zookeeper.AsyncCallback;<a name="line.59"></a> +<span class="sourceLineNo">060</span>import org.apache.zookeeper.KeeperException;<a name="line.60"></a> +<span class="sourceLineNo">061</span>import org.apache.zookeeper.data.Stat;<a name="line.61"></a> +<span class="sourceLineNo">062</span><a name="line.62"></a> +<span class="sourceLineNo">063</span>/**<a name="line.63"></a> +<span class="sourceLineNo">064</span> * ZooKeeper based implementation of {@link SplitLogWorkerCoordination}<a name="line.64"></a> +<span class="sourceLineNo">065</span> * It listen for changes in ZooKeeper and<a name="line.65"></a> +<span class="sourceLineNo">066</span> *<a name="line.66"></a> +<span class="sourceLineNo">067</span> */<a name="line.67"></a> +<span class="sourceLineNo">068</span>@InterfaceAudience.Private<a name="line.68"></a> +<span class="sourceLineNo">069</span>public class ZkSplitLogWorkerCoordination extends ZooKeeperListener implements<a name="line.69"></a> +<span class="sourceLineNo">070</span> SplitLogWorkerCoordination {<a name="line.70"></a> +<span class="sourceLineNo">071</span><a name="line.71"></a> +<span class="sourceLineNo">072</span> private static final Log LOG = LogFactory.getLog(ZkSplitLogWorkerCoordination.class);<a name="line.72"></a> +<span class="sourceLineNo">073</span><a name="line.73"></a> +<span class="sourceLineNo">074</span> private static final int checkInterval = 5000; // 5 seconds<a name="line.74"></a> +<span class="sourceLineNo">075</span> private static final int FAILED_TO_OWN_TASK = -1;<a name="line.75"></a> +<span class="sourceLineNo">076</span><a name="line.76"></a> +<span class="sourceLineNo">077</span> private SplitLogWorker worker;<a name="line.77"></a> +<span class="sourceLineNo">078</span><a name="line.78"></a> +<span class="sourceLineNo">079</span> private TaskExecutor splitTaskExecutor;<a name="line.79"></a> +<span class="sourceLineNo">080</span><a name="line.80"></a> +<span class="sourceLineNo">081</span> private final Object taskReadyLock = new Object();<a name="line.81"></a> +<span class="sourceLineNo">082</span> private AtomicInteger taskReadySeq = new AtomicInteger(0);<a name="line.82"></a> +<span class="sourceLineNo">083</span> private volatile String currentTask = null;<a name="line.83"></a> +<span class="sourceLineNo">084</span> private int currentVersion;<a name="line.84"></a> +<span class="sourceLineNo">085</span> private volatile boolean shouldStop = false;<a name="line.85"></a> +<span class="sourceLineNo">086</span> private final Object grabTaskLock = new Object();<a name="line.86"></a> +<span class="sourceLineNo">087</span> private boolean workerInGrabTask = false;<a name="line.87"></a> +<span class="sourceLineNo">088</span> private int reportPeriod;<a name="line.88"></a> +<span class="sourceLineNo">089</span> private RegionServerServices server = null;<a name="line.89"></a> +<span class="sourceLineNo">090</span> protected final AtomicInteger tasksInProgress = new AtomicInteger(0);<a name="line.90"></a> +<span class="sourceLineNo">091</span> private int maxConcurrentTasks = 0;<a name="line.91"></a> +<span class="sourceLineNo">092</span><a name="line.92"></a> +<span class="sourceLineNo">093</span> private final ZkCoordinatedStateManager manager;<a name="line.93"></a> +<span class="sourceLineNo">094</span><a name="line.94"></a> +<span class="sourceLineNo">095</span> public ZkSplitLogWorkerCoordination(ZkCoordinatedStateManager zkCoordinatedStateManager,<a name="line.95"></a> +<span class="sourceLineNo">096</span> ZooKeeperWatcher watcher) {<a name="line.96"></a> +<span class="sourceLineNo">097</span> super(watcher);<a name="line.97"></a> +<span class="sourceLineNo">098</span> manager = zkCoordinatedStateManager;<a name="line.98"></a> +<span class="sourceLineNo">099</span><a name="line.99"></a> +<span class="sourceLineNo">100</span> }<a name="line.100"></a> +<span class="sourceLineNo">101</span><a name="line.101"></a> +<span class="sourceLineNo">102</span> /**<a name="line.102"></a> +<span class="sourceLineNo">103</span> * Override handler from {@link ZooKeeperListener}<a name="line.103"></a> +<span class="sourceLineNo">104</span> */<a name="line.104"></a> +<span class="sourceLineNo">105</span> @Override<a name="line.105"></a> +<span class="sourceLineNo">106</span> public void nodeChildrenChanged(String path) {<a name="line.106"></a> +<span class="sourceLineNo">107</span> if (path.equals(watcher.znodePaths.splitLogZNode)) {<a name="line.107"></a> +<span class="sourceLineNo">108</span> if (LOG.isTraceEnabled()) LOG.trace("tasks arrived or departed on " + path);<a name="line.108"></a> +<span class="sourceLineNo">109</span> synchronized (taskReadyLock) {<a name="line.109"></a> +<span class="sourceLineNo">110</span> this.taskReadySeq.incrementAndGet();<a name="line.110"></a> +<span class="sourceLineNo">111</span> taskReadyLock.notify();<a name="line.111"></a> +<span class="sourceLineNo">112</span> }<a name="line.112"></a> +<span class="sourceLineNo">113</span> }<a name="line.113"></a> +<span class="sourceLineNo">114</span> }<a name="line.114"></a> +<span class="sourceLineNo">115</span><a name="line.115"></a> +<span class="sourceLineNo">116</span> /**<a name="line.116"></a> +<span class="sourceLineNo">117</span> * Override handler from {@link ZooKeeperListener}<a name="line.117"></a> +<span class="sourceLineNo">118</span> */<a name="line.118"></a> +<span class="sourceLineNo">119</span> @Override<a name="line.119"></a> +<span class="sourceLineNo">120</span> public void nodeDataChanged(String path) {<a name="line.120"></a> +<span class="sourceLineNo">121</span> // there will be a self generated dataChanged event every time attemptToOwnTask()<a name="line.121"></a> +<span class="sourceLineNo">122</span> // heartbeats the task znode by upping its version<a name="line.122"></a> +<span class="sourceLineNo">123</span> synchronized (grabTaskLock) {<a name="line.123"></a> +<span class="sourceLineNo">124</span> if (workerInGrabTask) {<a name="line.124"></a> +<span class="sourceLineNo">125</span> // currentTask can change<a name="line.125"></a> +<span class="sourceLineNo">126</span> String taskpath = currentTask;<a name="line.126"></a> +<span class="sourceLineNo">127</span> if (taskpath != null && taskpath.equals(path)) {<a name="line.127"></a> +<span class="sourceLineNo">128</span> getDataSetWatchAsync();<a name="line.128"></a> +<span class="sourceLineNo">129</span> }<a name="line.129"></a> +<span class="sourceLineNo">130</span> }<a name="line.130"></a> +<span class="sourceLineNo">131</span> }<a name="line.131"></a> +<span class="sourceLineNo">132</span> }<a name="line.132"></a> +<span class="sourceLineNo">133</span><a name="line.133"></a> +<span class="sourceLineNo">134</span> /**<a name="line.134"></a> +<span class="sourceLineNo">135</span> * Override setter from {@link SplitLogWorkerCoordination}<a name="line.135"></a> +<span class="sourceLineNo">136</span> */<a name="line.136"></a> +<span class="sourceLineNo">137</span> @Override<a name="line.137"></a> +<span class="sourceLineNo">138</span> public void init(RegionServerServices server, Configuration conf,<a name="line.138"></a> +<span class="sourceLineNo">139</span> TaskExecutor splitExecutor, SplitLogWorker worker) {<a name="line.139"></a> +<span class="sourceLineNo">140</span> this.server = server;<a name="line.140"></a> +<span class="sourceLineNo">141</span> this.worker = worker;<a name="line.141"></a> +<span class="sourceLineNo">142</span> this.splitTaskExecutor = splitExecutor;<a name="line.142"></a> +<span class="sourceLineNo">143</span> maxConcurrentTasks = conf.getInt("hbase.regionserver.wal.max.splitters", DEFAULT_MAX_SPLITTERS);<a name="line.143"></a> +<span class="sourceLineNo">144</span> reportPeriod =<a name="line.144"></a> +<span class="sourceLineNo">145</span> conf.getInt("hbase.splitlog.report.period",<a name="line.145"></a> +<span class="sourceLineNo">146</span> conf.getInt(HConstants.HBASE_SPLITLOG_MANAGER_TIMEOUT,<a name="line.146"></a> +<span class="sourceLineNo">147</span> ZKSplitLogManagerCoordination.DEFAULT_TIMEOUT) / 3);<a name="line.147"></a> +<span class="sourceLineNo">148</span> }<a name="line.148"></a> +<span class="sourceLineNo">149</span><a name="line.149"></a> +<span class="sourceLineNo">150</span> /* Support functions for ZooKeeper async callback */<a name="line.150"></a> +<span class="sourceLineNo">151</span><a name="line.151"></a> +<span class="sourceLineNo">152</span> void getDataSetWatchFailure(String path) {<a name="line.152"></a> +<span class="sourceLineNo">153</span> synchronized (grabTaskLock) {<a name="line.153"></a> +<span class="sourceLineNo">154</span> if (workerInGrabTask) {<a name="line.154"></a> +<span class="sourceLineNo">155</span> // currentTask can change but that's ok<a name="line.155"></a> +<span class="sourceLineNo">156</span> String taskpath = currentTask;<a name="line.156"></a> +<span class="sourceLineNo">157</span> if (taskpath != null && taskpath.equals(path)) {<a name="line.157"></a> +<span class="sourceLineNo">158</span> LOG.info("retrying data watch on " + path);<a name="line.158"></a> +<span class="sourceLineNo">159</span> SplitLogCounters.tot_wkr_get_data_retry.incrementAndGet();<a name="line.159"></a> +<span class="sourceLineNo">160</span> getDataSetWatchAsync();<a name="line.160"></a> +<span class="sourceLineNo">161</span> } else {<a name="line.161"></a> +<span class="sourceLineNo">162</span> // no point setting a watch on the task which this worker is not<a name="line.162"></a> +<span class="sourceLineNo">163</span> // working upon anymore<a name="line.163"></a> +<span class="sourceLineNo">164</span> }<a name="line.164"></a> +<span class="sourceLineNo">165</span> }<a name="line.165"></a> +<span class="sourceLineNo">166</span> }<a name="line.166"></a> +<span class="sourceLineNo">167</span> }<a name="line.167"></a> +<span class="sourceLineNo">168</span><a name="line.168"></a> +<span class="sourceLineNo">169</span> public void getDataSetWatchAsync() {<a name="line.169"></a> +<span class="sourceLineNo">170</span> watcher.getRecoverableZooKeeper().getZooKeeper()<a name="line.170"></a> +<span class="sourceLineNo">171</span> .getData(currentTask, watcher, new GetDataAsyncCallback(), null);<a name="line.171"></a> +<span class="sourceLineNo">172</span> SplitLogCounters.tot_wkr_get_data_queued.incrementAndGet();<a name="line.172"></a> +<span class="sourceLineNo">173</span> }<a name="line.173"></a> +<span class="sourceLineNo">174</span><a name="line.174"></a> +<span class="sourceLineNo">175</span> void getDataSetWatchSuccess(String path, byte[] data) {<a name="line.175"></a> +<span class="sourceLineNo">176</span> SplitLogTask slt;<a name="line.176"></a> +<span class="sourceLineNo">177</span> try {<a name="line.177"></a> +<span class="sourceLineNo">178</span> slt = SplitLogTask.parseFrom(data);<a name="line.178"></a> +<span class="sourceLineNo">179</span> } catch (DeserializationException e) {<a name="line.179"></a> +<span class="sourceLineNo">180</span> LOG.warn("Failed parse", e);<a name="line.180"></a> +<span class="sourceLineNo">181</span> return;<a name="line.181"></a> +<span class="sourceLineNo">182</span> }<a name="line.182"></a> +<span class="sourceLineNo">183</span> synchronized (grabTaskLock) {<a name="line.183"></a> +<span class="sourceLineNo">184</span> if (workerInGrabTask) {<a name="line.184"></a> +<span class="sourceLineNo">185</span> // currentTask can change but that's ok<a name="line.185"></a> +<span class="sourceLineNo">186</span> String taskpath = currentTask;<a name="line.186"></a> +<span class="sourceLineNo">187</span> if (taskpath != null && taskpath.equals(path)) {<a name="line.187"></a> +<span class="sourceLineNo">188</span> ServerName serverName = manager.getServer().getServerName();<a name="line.188"></a> +<span class="sourceLineNo">189</span> // have to compare data. cannot compare version because then there<a name="line.189"></a> +<span class="sourceLineNo">190</span> // will be race with attemptToOwnTask()<a name="line.190"></a> +<span class="sourceLineNo">191</span> // cannot just check whether the node has been transitioned to<a name="line.191"></a> +<span class="sourceLineNo">192</span> // UNASSIGNED because by the time this worker sets the data watch<a name="line.192"></a> +<span class="sourceLineNo">193</span> // the node might have made two transitions - from owned by this<a name="line.193"></a> +<span class="sourceLineNo">194</span> // worker to unassigned to owned by another worker<a name="line.194"></a> +<span class="sourceLineNo">195</span> if (!slt.isOwned(serverName) && !slt.isDone(serverName) && !slt.isErr(serverName)<a name="line.195"></a> +<span class="sourceLineNo">196</span> && !slt.isResigned(serverName)) {<a name="line.196"></a> +<span class="sourceLineNo">197</span> LOG.info("task " + taskpath + " preempted from " + serverName<a name="line.197"></a> +<span class="sourceLineNo">198</span> + ", current task state and owner=" + slt.toString());<a name="line.198"></a> +<span class="sourceLineNo">199</span> worker.stopTask();<a name="line.199"></a> +<span class="sourceLineNo">200</span> }<a name="line.200"></a> +<span class="sourceLineNo">201</span> }<a name="line.201"></a> +<span class="sourceLineNo">202</span> }<a name="line.202"></a> +<span class="sourceLineNo">203</span> }<a name="line.203"></a> +<span class="sourceLineNo">204</span> }<a name="line.204"></a> +<span class="sourceLineNo">205</span><a name="line.205"></a> +<span class="sourceLineNo">206</span> /**<a name="line.206"></a> +<span class="sourceLineNo">207</span> * try to grab a 'lock' on the task zk node to own and execute the task.<a name="line.207"></a> +<span class="sourceLineNo">208</span> * <p><a name="line.208"></a> +<span class="sourceLineNo">209</span> * @param path zk node for the task<a name="line.209"></a> +<span class="sourceLineNo">210</span> */<a name="line.210"></a> +<span class="sourceLineNo">211</span> private void grabTask(String path) {<a name="line.211"></a> +<span class="sourceLineNo">212</span> Stat stat = new Stat();<a name="line.212"></a> +<span class="sourceLineNo">213</span> byte[] data;<a name="line.213"></a> +<span class="sourceLineNo">214</span> synchronized (grabTaskLock) {<a name="line.214"></a> +<span class="sourceLineNo">215</span> currentTask = path;<a name="line.215"></a> +<span class="sourceLineNo">216</span> workerInGrabTask = true;<a name="line.216"></a> +<span class="sourceLineNo">217</span> if (Thread.interrupted()) {<a name="line.217"></a> +<span class="sourceLineNo">218</span> return;<a name="line.218"></a> +<span class="sourceLineNo">219</span> }<a name="line.219"></a> +<span class="sourceLineNo">220</span> }<a name="line.220"></a> +<span class="sourceLineNo">221</span> try {<a name="line.221"></a> +<span class="sourceLineNo">222</span> try {<a name="line.222"></a> +<span class="sourceLineNo">223</span> if ((data = ZKUtil.getDataNoWatch(watcher, path, stat)) == null) {<a name="line.223"></a> +<span class="sourceLineNo">224</span> SplitLogCounters.tot_wkr_failed_to_grab_task_no_data.incrementAndGet();<a name="line.224"></a> +<span class="sourceLineNo">225</span> return;<a name="line.225"></a> +<span class="sourceLineNo">226</span> }<a name="line.226"></a> +<span class="sourceLineNo">227</span> } catch (KeeperException e) {<a name="line.227"></a> +<span class="sourceLineNo">228</span> LOG.warn("Failed to get data for znode " + path, e);<a name="line.228"></a> +<span class="sourceLineNo">229</span> SplitLogCounters.tot_wkr_failed_to_grab_task_exception.incrementAndGet();<a name="line.229"></a> +<span class="sourceLineNo">230</span> return;<a name="line.230"></a> +<span class="sourceLineNo">231</span> }<a name="line.231"></a> +<span class="sourceLineNo">232</span> SplitLogTask slt;<a name="line.232"></a> +<span class="sourceLineNo">233</span> try {<a name="line.233"></a> +<span class="sourceLineNo">234</span> slt = SplitLogTask.parseFrom(data);<a name="line.234"></a> +<span class="sourceLineNo">235</span> } catch (DeserializationException e) {<a name="line.235"></a> +<span class="sourceLineNo">236</span> LOG.warn("Failed parse data for znode " + path, e);<a name="line.236"></a> +<span class="sourceLineNo">237</span> SplitLogCounters.tot_wkr_failed_to_grab_task_exception.incrementAndGet();<a name="line.237"></a> +<span class="sourceLineNo">238</span> return;<a name="line.238"></a> +<span class="sourceLineNo">239</span> }<a name="line.239"></a> +<span class="sourceLineNo">240</span> if (!slt.isUnassigned()) {<a name="line.240"></a> +<span class="sourceLineNo">241</span> SplitLogCounters.tot_wkr_failed_to_grab_task_owned.incrementAndGet();<a name="line.241"></a> +<span class="sourceLineNo">242</span> return;<a name="line.242"></a> +<span class="sourceLineNo">243</span> }<a name="line.243"></a> +<span class="sourceLineNo">244</span><a name="line.244"></a> +<span class="sourceLineNo">245</span> currentVersion =<a name="line.245"></a> +<span class="sourceLineNo">246</span> attemptToOwnTask(true, watcher, server.getServerName(), path,<a name="line.246"></a> +<span class="sourceLineNo">247</span> slt.getMode(), stat.getVersion());<a name="line.247"></a> +<span class="sourceLineNo">248</span> if (currentVersion < 0) {<a name="line.248"></a> +<span class="sourceLineNo">249</span> SplitLogCounters.tot_wkr_failed_to_grab_task_lost_race.incrementAndGet();<a name="line.249"></a> +<span class="sourceLineNo">250</span> return;<a name="line.250"></a> +<span class="sourceLineNo">251</span> }<a name="line.251"></a> +<span class="sourceLineNo">252</span><a name="line.252"></a> +<span class="sourceLineNo">253</span> if (ZKSplitLog.isRescanNode(watcher, currentTask)) {<a name="line.253"></a> +<span class="sourceLineNo">254</span> ZkSplitLogWorkerCoordination.ZkSplitTaskDetails splitTaskDetails =<a name="line.254"></a> +<span class="sourceLineNo">255</span> new ZkSplitLogWorkerCoordination.ZkSplitTaskDetails();<a name="line.255"></a> +<span class="sourceLineNo">256</span> splitTaskDetails.setTaskNode(currentTask);<a name="line.256"></a> +<span class="sourceLineNo">257</span> splitTaskDetails.setCurTaskZKVersion(new MutableInt(currentVersion));<a name="line.257"></a> +<span class="sourceLineNo">258</span><a name="line.258"></a> +<span class="sourceLineNo">259</span> endTask(new SplitLogTask.Done(server.getServerName(), slt.getMode()),<a name="line.259"></a> +<span class="sourceLineNo">260</span> SplitLogCounters.tot_wkr_task_acquired_rescan, splitTaskDetails);<a name="line.260"></a> +<span class="sourceLineNo">261</span> return;<a name="line.261"></a> +<span class="sourceLineNo">262</span> }<a name="line.262"></a> +<span class="sourceLineNo">263</span><a name="line.263"></a> +<span class="sourceLineNo">264</span> LOG.info("worker " + server.getServerName() + " acquired task " + path);<a name="line.264"></a> +<span class="sourceLineNo">265</span> SplitLogCounters.tot_wkr_task_acquired.incrementAndGet();<a name="line.265"></a> +<span class="sourceLineNo">266</span> getDataSetWatchAsync();<a name="line.266"></a> +<span class="sourceLineNo">267</span><a name="line.267"></a> +<span class="sourceLineNo">268</span> submitTask(path, slt.getMode(), currentVersion, reportPeriod);<a name="line.268"></a> +<span class="sourceLineNo">269</span><a name="line.269"></a> +<span class="sourceLineNo">270</span> // after a successful submit, sleep a little bit to allow other RSs to grab the rest tasks<a name="line.270"></a> +<span class="sourceLineNo">271</span> try {<a name="line.271"></a> +<span class="sourceLineNo">272</span> int sleepTime = RandomUtils.nextInt(500) + 500;<a name="line.272"></a> +<span class="sourceLineNo">273</span> Thread.sleep(sleepTime);<a name="line.273"></a> +<span class="sourceLineNo">274</span> } catch (InterruptedException e) {<a name="line.274"></a> +<span class="sourceLineNo">275</span> LOG.warn("Interrupted while yielding for other region servers", e);<a name="line.275"></a> +<span class="sourceLineNo">276</span> Thread.currentThread().interrupt();<a name="line.276"></a> +<span class="sourceLineNo">277</span> }<a name="line.277"></a> +<span class="sourceLineNo">278</span> } finally {<a name="line.278"></a> +<span class="sourceLineNo">279</span> synchronized (grabTaskLock) {<a name="line.279"></a> +<span class="sourceLineNo">280</span> workerInGrabTask = false;<a name="line.280"></a> +<span class="sourceLineNo">281</span> // clear the interrupt from stopTask() otherwise the next task will<a name="line.281"></a> +<span class="sourceLineNo">282</span> // suffer<a name="line.282"></a> +<span class="sourceLineNo">283</span> Thread.interrupted();<a name="line.283"></a> +<span class="sourceLineNo">284</span> }<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> * Submit a log split task to executor service<a name="line.289"></a> +<span class="sourceLineNo">290</span> * @param curTask task to submit<a name="line.290"></a> +<span class="sourceLineNo">291</span> * @param curTaskZKVersion current version of task<a name="line.291"></a> +<span class="sourceLineNo">292</span> */<a name="line.292"></a> +<span class="sourceLineNo">293</span> void submitTask(final String curTask, final RecoveryMode mode, final int curTaskZKVersion,<a name="line.293"></a> +<span class="sourceLineNo">294</span> final int reportPeriod) {<a name="line.294"></a> +<span class="sourceLineNo">295</span> final MutableInt zkVersion = new MutableInt(curTaskZKVersion);<a name="line.295"></a> +<span class="sourceLineNo">296</span><a name="line.296"></a> +<span class="sourceLineNo">297</span> CancelableProgressable reporter = new CancelableProgressable() {<a name="line.297"></a> +<span class="sourceLineNo">298</span> private long last_report_at = 0;<a name="line.298"></a> +<span class="sourceLineNo">299</span><a name="line.299"></a> +<span class="sourceLineNo">300</span> @Override<a name="line.300"></a> +<span class="sourceLineNo">301</span> public boolean progress() {<a name="line.301"></a> +<span class="sourceLineNo">302</span> long t = EnvironmentEdgeManager.currentTime();<a name="line.302"></a> +<span class="sourceLineNo">303</span> if ((t - last_report_at) > reportPeriod) {<a name="line.303"></a> +<span class="sourceLineNo">304</span> last_report_at = t;<a name="line.304"></a> +<span class="sourceLineNo">305</span> int latestZKVersion =<a name="line.305"></a> +<span class="sourceLineNo">306</span> attemptToOwnTask(false, watcher, server.getServerName(), curTask,<a name="line.306"></a> +<span class="sourceLineNo">307</span> mode, zkVersion.intValue());<a name="line.307"></a> +<span class="sourceLineNo">308</span> if (latestZKVersion < 0) {<a name="line.308"></a> +<span class="sourceLineNo">309</span> LOG.warn("Failed to heartbeat the task" + curTask);<a name="line.309"></a> +<span class="sourceLineNo">310</span> return false;<a name="line.310"></a> +<span class="sourceLineNo">311</span> }<a name="line.311"></a> +<span class="sourceLineNo">312</span> zkVersion.setValue(latestZKVersion);<a name="line.312"></a> +<span class="sourceLineNo">313</span> }<a name="line.313"></a> +<span class="sourceLineNo">314</span> return true;<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> ZkSplitLogWorkerCoordination.ZkSplitTaskDetails splitTaskDetails =<a name="line.317"></a> +<span class="sourceLineNo">318</span> new ZkSplitLogWorkerCoordination.ZkSplitTaskDetails();<a name="line.318"></a> +<span class="sourceLineNo">319</span> splitTaskDetails.setTaskNode(curTask);<a name="line.319"></a> +<span class="sourceLineNo">320</span> splitTaskDetails.setCurTaskZKVersion(zkVersion);<a name="line.320"></a> +<span class="sourceLineNo">321</span><a name="line.321"></a> +<span class="sourceLineNo">322</span> WALSplitterHandler hsh =<a name="line.322"></a> +<span class="sourceLineNo">323</span> new WALSplitterHandler(server, this, splitTaskDetails, reporter,<a name="line.323"></a> +<span class="sourceLineNo">324</span> this.tasksInProgress, splitTaskExecutor, mode);<a name="line.324"></a> +<span class="sourceLineNo">325</span> server.getExecutorService().submit(hsh);<a name="line.325"></a> +<span class="sourceLineNo">326</span> }<a name="line.326"></a> +<span class="sourceLineNo">327</span><a name="line.327"></a> +<span class="sourceLineNo">328</span> /**<a name="line.328"></a> +<span class="sourceLineNo">329</span> * This function calculates how many splitters it could create based on expected average tasks per<a name="line.329"></a> +<span class="sourceLineNo">330</span> * RS and the hard limit upper bound(maxConcurrentTasks) set by configuration. <br><a name="line.330"></a> +<span class="sourceLineNo">331</span> * At any given time, a RS allows spawn MIN(Expected Tasks/RS, Hard Upper Bound)<a name="line.331"></a> +<span class="sourceLineNo">332</span> * @param numTasks current total number of available tasks<a name="line.332"></a> +<span class="sourceLineNo">333</span> */<a name="line.333"></a> +<span class="sourceLineNo">334</span> private int calculateAvailableSplitters(int numTasks) {<a name="line.334"></a> +<span class="sourceLineNo">335</span> // at lease one RS(itself) available<a name="line.335"></a> +<span class="sourceLineNo">336</span> int availableRSs = 1;<a name="line.336"></a> +<span class="sourceLineNo">337</span> try {<a name="line.337"></a> +<span class="sourceLineNo">338</span> List<String> regionServers =<a name="line.338"></a> +<span class="sourceLineNo">339</span> ZKUtil.listChildrenNoWatch(watcher, watcher.znodePaths.rsZNode);<a name="line.339"></a> +<span class="sourceLineNo">340</span> availableRSs = Math.max(availableRSs, (regionServers == null) ? 0 : regionServers.size());<a name="line.340"></a> +<span class="sourceLineNo">341</span> } catch (KeeperException e) {<a name="line.341"></a> +<span class="sourceLineNo">342</span> // do nothing<a name="line.342"></a> +<span class="sourceLineNo">343</span> LOG.debug("getAvailableRegionServers got ZooKeeper exception", e);<a name="line.343"></a> +<span class="sourceLineNo">344</span> }<a name="line.344"></a> +<span class="sourceLineNo">345</span><a name="line.345"></a> +<span class="sourceLineNo">346</span> int expectedTasksPerRS = (numTasks / availableRSs) + ((numTasks % availableRSs == 0) ? 0 : 1);<a name="line.346"></a> +<span class="sourceLineNo">347</span> expectedTasksPerRS = Math.max(1, expectedTasksPerRS); // at least be one<a name="line.347"></a> +<span class="sourceLineNo">348</span> // calculate how many more splitters we could spawn<a name="line.348"></a> +<span class="sourceLineNo">349</span> return Math.min(expectedTasksPerRS, maxConcurrentTasks)<a name="line.349"></a> +<span class="sourceLineNo">350</span> - this.tasksInProgress.get();<a name="line.350"></a> +<span class="sourceLineNo">351</span> }<a name="line.351"></a> +<span class="sourceLineNo">352</span><a name="line.352"></a> +<span class="sourceLineNo">353</span> /**<a name="line.353"></a> +<span class="sourceLineNo">354</span> * Try to own the task by transitioning the zk node data from UNASSIGNED to OWNED.<a name="line.354"></a> +<span class="sourceLineNo">355</span> * <p><a name="line.355"></a> +<span class="sourceLineNo">356</span> * This method is also used to periodically heartbeat the task progress by transitioning the node<a name="line.356"></a> +<span class="sourceLineNo">357</span> * from OWNED to OWNED.<a name="line.357"></a> +<span class="sourceLineNo">358</span> * <p><a name="line.358"></a> +<span class="sourceLineNo">359</span> * @param isFirstTime shows whther it's the first attempt.<a name="line.359"></a> +<span class="sourceLineNo">360</span> * @param zkw zk wathcer<a name="line.360"></a> +<span class="sourceLineNo">361</span> * @param server name<a name="line.361"></a> +<span class="sourceLineNo">362</span> * @param task to own<a name="line.362"></a> +<span class="sourceLineNo">363</span> * @param taskZKVersion version of the task in zk<a name="line.363"></a> +<span class="sourceLineNo">364</span> * @return non-negative integer value when task can be owned by current region server otherwise -1<a name="line.364"></a> +<span class="sourceLineNo">365</span> */<a name="line.365"></a> +<span class="sourceLineNo">366</span> protected static int attemptToOwnTask(boolean isFirstTime, ZooKeeperWatcher zkw,<a name="line.366"></a> +<span class="sourceLineNo">367</span> ServerName server, String task, RecoveryMode mode, int taskZKVersion) {<a name="line.367"></a> +<span class="sourceLineNo">368</span> int latestZKVersion = FAILED_TO_OWN_TASK;<a name="line.368"></a> +<span class="sourceLineNo">369</span> try {<a name="line.369"></a> +<span class="sourceLineNo">370</span> SplitLogTask slt = new SplitLogTask.Owned(server, mode);<a name="line.370"></a> +<span class="sourceLineNo">371</span> Stat stat = zkw.getRecoverableZooKeeper().setData(task, slt.toByteArray(), taskZKVersion);<a name="line.371"></a> +<span class="sourceLineNo">372</span> if (stat == null) {<a name="line.372"></a> +<span class="sourceLineNo">373</span> LOG.warn("zk.setData() returned null for path " + task);<a name="line.373"></a> +<span class="sourceLineNo">374</span> SplitLogCounters.tot_wkr_task_heartbeat_failed.incrementAndGet();<a name="line.374"></a> +<span class="sourceLineNo">375</span> return FAILED_TO_OWN_TASK;<a name="line.375"></a> +<span class="sourceLineNo">376</span> }<a name="line.376"></a> +<span class="sourceLineNo">377</span> latestZKVersion = stat.getVersion();<a name="line.377"></a> +<span class="sourceLineNo">378</span> SplitLogCounters.tot_wkr_task_heartbeat.incrementAndGet();<a name="line.378"></a> +<span class="sourceLineNo">379</span> return latestZKVersion;<a name="line.379"></a> +<span class="sourceLineNo">380</span> } catch (KeeperException e) {<a name="line.380"></a> +<span class="sourceLineNo">381</span> if (!isFirstTime) {<a name="line.381"></a> +<span class="sourceLineNo">382</span> if (e.code().equals(KeeperException.Code.NONODE)) {<a name="line.382"></a> +<span class="sourceLineNo">383</span> LOG.warn("NONODE failed to assert ownership for " + task, e);<a name="line.383"></a> +<span class="sourceLineNo">384</span> } else if (e.code().equals(KeeperException.Code.BADVERSION)) {<a name="line.384"></a> +<span class="sourceLineNo">385</span> LOG.warn("BADVERSION failed to assert ownership for " + task, e);<a name="line.385"></a> +<span class="sourceLineNo">386</span> } else {<a name="line.386"></a> +<span class="sourceLineNo">387</span> LOG.warn("failed to assert ownership for " + task, e);<a name="line.387"></a> +<span class="sourceLineNo">388</span> }<a name="line.388"></a> +<span class="sourceLineNo">389</span> }<a name="line.389"></a> +<span class="sourceLineNo">390</span> } catch (InterruptedException e1) {<a name="line.390"></a> +<span class="sourceLineNo">391</span> LOG.warn("Interrupted while trying to assert ownership of " + task + " "<a name="line.391"></a> +<span class="sourceLineNo">392</span> + StringUtils.stringifyException(e1));<a name="line.392"></a> +<span class="sourceLineNo">393</span> Thread.currentThread().interrupt();<a name="line.393"></a> +<span class="sourceLineNo">394</span> }<a name="line.394"></a> +<span class="sourceLineNo">395</span> SplitLogCounters.tot_wkr_task_heartbeat_failed.incrementAndGet();<a name="line.395"></a> +<span class="sourceLineNo">396</span> return FAILED_TO_OWN_TASK;<a name="line.396"></a> +<span class="sourceLineNo">397</span> }<a name="line.397"></a> +<span class="sourceLineNo">398</span><a name="line.398"></a> +<span class="sourceLineNo">399</span> /**<a name="line.399"></a> +<span class="sourceLineNo">400</span> * Wait for tasks to become available at /hbase/splitlog zknode. Grab a task one at a time. This<a name="line.400"></a> +<span class="sourceLineNo">401</span> * policy puts an upper-limit on the number of simultaneous log splitting that could be happening<a name="line.401"></a> +<span class="sourceLineNo">402</span> * in a cluster.<a name="line.402"></a> +<span class="sourceLineNo">403</span> * <p><a name="line.403"></a> +<span class="sourceLineNo">404</span> * Synchronization using <code>taskReadyLock</code> ensures that it will try to grab every task<a name="line.404"></a> +<span class="sourceLineNo">405</span> * that has been put up<a name="line.405"></a> +<span class="sourceLineNo">406</span> * @throws InterruptedException<a name="line.406"></a> +<span class="sourceLineNo">407</span> */<a name="line.407"></a> +<span class="sourceLineNo">408</span> @Override<a name="line.408"></a> +<span class="sourceLineNo">409</span> public void taskLoop() throws InterruptedException {<a name="line.409"></a> +<span class="sourceLineNo">410</span> while (!shouldStop) {<a name="line.410"></a> +<span class="sourceLineNo">411</span> int seq_start = taskReadySeq.get();<a name="line.411"></a> +<span class="sourceLineNo">412</span> List<String> paths = null;<a name="line.412"></a> +<span class="sourceLineNo">413</span> paths = getTaskList();<a name="line.413"></a> +<span class="sourceLineNo">414</span> if (paths == null) {<a name="line.414"></a> +<span class="sourceLineNo">415</span> LOG.warn("Could not get tasks, did someone remove " + watcher.znodePaths.splitLogZNode<a name="line.415"></a> +<span class="sourceLineNo">416</span> + " ... worker thread exiting.");<a name="line.416"></a> +<span class="sourceLineNo">417</span> return;<a name="line.417"></a> +<span class="sourceLineNo">418</span> }<a name="line.418"></a> +<span class="sourceLineNo">419</span> // pick meta wal firstly<a name="line.419"></a> +<span class="sourceLineNo">420</span> int offset = (int) (Math.random() * paths.size());<a name="line.420"></a> +<span class="sourceLineNo">421</span> for (int i = 0; i < paths.size(); i++) {<a name="line.421"></a> +<span class="sourceLineNo">422</span> if (AbstractFSWALProvider.isMetaFile(paths.get(i))) {<a name="line.422"></a> +<span class="sourceLineNo">423</span> offset = i;<a name="line.423"></a> +<span class="sourceLineNo">424</span> break;<a name="line.424"></a> +<span class="sourceLineNo">425</span> }<a name="line.425"></a> +<span class="sourceLineNo">426</span> }<a name="line.426"></a> +<span class="sourceLineNo">427</span> int numTasks = paths.size();<a name="line.427"></a> +<span class="sourceLineNo">428</span> for (int i = 0; i < numTasks; i++) {<a name="line.428"></a> +<span class="sourceLineNo">429</span> int idx = (i + offset) % paths.size();<a name="line.429"></a> +<span class="sourceLineNo">430</span> // don't call ZKSplitLog.getNodeName() because that will lead to<a name="line.430"></a> +<span class="sourceLineNo">431</span> // double encoding of the path name<a name="line.431"></a> +<span class="sourceLineNo">432</span> if (this.calculateAvailableSplitters(numTasks) > 0) {<a name="line.432"></a> +<span class="sourceLineNo">433</span> grabTask(ZKUtil.joinZNode(watcher.znodePaths.splitLogZNode, paths.get(idx)));<a name="line.433"></a> +<span class="sourceLineNo">434</span> } else {<a name="line.434"></a> +<span class="sourceLineNo">435</span> LOG.debug("Current region server " + server.getServerName() + " has "<a name="line.435"></a> +<span class="sourceLineNo">436</span> + this.tasksInProgress.get() + " tasks in progress and can't take more.");<a name="line.436"></a> +<span class="sourceLineNo">437</span> break;<a name="line.437"></a> +<span class="sourceLineNo">438</span> }<a name="line.438"></a> +<span class="sourceLineNo">439</span> if (shouldStop) {<a name="line.439"></a> +<span class="sourceLineNo">440</span> return;<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> SplitLogCounters.tot_wkr_task_grabing.incrementAndGet();<a name="line.443"></a> +<span class="sourceLineNo">444</span> synchronized (taskReadyLock) {<a name="line.444"></a> +<span class="sourceLineNo">445</span> while (seq_start == taskReadySeq.get()) {<a name="line.445"></a> +<span class="sourceLineNo">446</span> taskReadyLock.wait(checkInterval);<a name="line.446"></a> +<span class="sourceLineNo">447</span> if (server != null) {<a name="line.447"></a> +<span class="sourceLineNo">448</span> // check to see if we have stale recovering regions in our internal memory state<a name="line.448"></a> +<span class="sourceLineNo">449</span> Map<String, Region> recoveringRegions = server.getRecoveringRegions();<a name="line.449"></a> +<span class="sourceLineNo">450</span> if (!recoveringRegions.isEmpty()) {<a name="line.450"></a> +<span class="sourceLineNo">451</span> // Make a local copy to prevent ConcurrentModificationException when other threads<a name="line.451"></a> +<span class="sourceLineNo">452</span> // modify recoveringRegions<a name="line.452"></a> +<span class="sourceLineNo">453</span> List<String> tmpCopy = new ArrayList<>(recoveringRegions.keySet());<a name="line.453"></a> +<span class="sourceLineNo">454</span> int listSize = tmpCopy.size();<a name="line.454"></a> +<span class="sourceLineNo">455</span> for (int i = 0; i < listSize; i++) {<a name="line.455"></a> +<span class="sourceLineNo">456</span> String region = tmpCopy.get(i);<a name="line.
<TRUNCATED>
