http://git-wip-us.apache.org/repos/asf/hbase-site/blob/c9d35424/devapidocs/src-html/org/apache/hadoop/hbase/client/ScannerCallableWithReplicas.html ---------------------------------------------------------------------- diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/client/ScannerCallableWithReplicas.html b/devapidocs/src-html/org/apache/hadoop/hbase/client/ScannerCallableWithReplicas.html index 33d2175..f9ef80a 100644 --- a/devapidocs/src-html/org/apache/hadoop/hbase/client/ScannerCallableWithReplicas.html +++ b/devapidocs/src-html/org/apache/hadoop/hbase/client/ScannerCallableWithReplicas.html @@ -43,394 +43,410 @@ <span class="sourceLineNo">035</span>import org.apache.commons.logging.Log;<a name="line.35"></a> <span class="sourceLineNo">036</span>import org.apache.commons.logging.LogFactory;<a name="line.36"></a> <span class="sourceLineNo">037</span>import org.apache.hadoop.conf.Configuration;<a name="line.37"></a> -<span class="sourceLineNo">038</span>import org.apache.hadoop.hbase.HRegionInfo;<a name="line.38"></a> -<span class="sourceLineNo">039</span>import org.apache.hadoop.hbase.RegionLocations;<a name="line.39"></a> -<span class="sourceLineNo">040</span>import org.apache.hadoop.hbase.TableName;<a name="line.40"></a> -<span class="sourceLineNo">041</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.41"></a> -<span class="sourceLineNo">042</span>import org.apache.hadoop.hbase.client.ScannerCallable.MoreResults;<a name="line.42"></a> -<span class="sourceLineNo">043</span>import org.apache.hadoop.hbase.util.Pair;<a name="line.43"></a> -<span class="sourceLineNo">044</span><a name="line.44"></a> -<span class="sourceLineNo">045</span>/**<a name="line.45"></a> -<span class="sourceLineNo">046</span> * This class has the logic for handling scanners for regions with and without replicas.<a name="line.46"></a> -<span class="sourceLineNo">047</span> * 1. A scan is attempted on the default (primary) region<a name="line.47"></a> -<span class="sourceLineNo">048</span> * 2. The scanner sends all the RPCs to the default region until it is done, or, there<a name="line.48"></a> -<span class="sourceLineNo">049</span> * is a timeout on the default (a timeout of zero is disallowed).<a name="line.49"></a> -<span class="sourceLineNo">050</span> * 3. If there is a timeout in (2) above, scanner(s) is opened on the non-default replica(s)<a name="line.50"></a> -<span class="sourceLineNo">051</span> * 4. The results from the first successful scanner are taken, and it is stored which server<a name="line.51"></a> -<span class="sourceLineNo">052</span> * returned the results.<a name="line.52"></a> -<span class="sourceLineNo">053</span> * 5. The next RPCs are done on the above stored server until it is done or there is a timeout,<a name="line.53"></a> -<span class="sourceLineNo">054</span> * in which case, the other replicas are queried (as in (3) above).<a name="line.54"></a> -<span class="sourceLineNo">055</span> *<a name="line.55"></a> -<span class="sourceLineNo">056</span> */<a name="line.56"></a> -<span class="sourceLineNo">057</span>@InterfaceAudience.Private<a name="line.57"></a> -<span class="sourceLineNo">058</span>class ScannerCallableWithReplicas implements RetryingCallable<Result[]> {<a name="line.58"></a> -<span class="sourceLineNo">059</span> private static final Log LOG = LogFactory.getLog(ScannerCallableWithReplicas.class);<a name="line.59"></a> -<span class="sourceLineNo">060</span> volatile ScannerCallable currentScannerCallable;<a name="line.60"></a> -<span class="sourceLineNo">061</span> AtomicBoolean replicaSwitched = new AtomicBoolean(false);<a name="line.61"></a> -<span class="sourceLineNo">062</span> final ClusterConnection cConnection;<a name="line.62"></a> -<span class="sourceLineNo">063</span> protected final ExecutorService pool;<a name="line.63"></a> -<span class="sourceLineNo">064</span> protected final int timeBeforeReplicas;<a name="line.64"></a> -<span class="sourceLineNo">065</span> private final Scan scan;<a name="line.65"></a> -<span class="sourceLineNo">066</span> private final int retries;<a name="line.66"></a> -<span class="sourceLineNo">067</span> private Result lastResult;<a name="line.67"></a> -<span class="sourceLineNo">068</span> private final RpcRetryingCaller<Result[]> caller;<a name="line.68"></a> -<span class="sourceLineNo">069</span> private final TableName tableName;<a name="line.69"></a> -<span class="sourceLineNo">070</span> private Configuration conf;<a name="line.70"></a> -<span class="sourceLineNo">071</span> private int scannerTimeout;<a name="line.71"></a> -<span class="sourceLineNo">072</span> private Set<ScannerCallable> outstandingCallables = new HashSet<>();<a name="line.72"></a> -<span class="sourceLineNo">073</span> private boolean someRPCcancelled = false; //required for testing purposes only<a name="line.73"></a> -<span class="sourceLineNo">074</span><a name="line.74"></a> -<span class="sourceLineNo">075</span> public ScannerCallableWithReplicas(TableName tableName, ClusterConnection cConnection,<a name="line.75"></a> -<span class="sourceLineNo">076</span> ScannerCallable baseCallable, ExecutorService pool, int timeBeforeReplicas, Scan scan,<a name="line.76"></a> -<span class="sourceLineNo">077</span> int retries, int scannerTimeout, int caching, Configuration conf,<a name="line.77"></a> -<span class="sourceLineNo">078</span> RpcRetryingCaller<Result []> caller) {<a name="line.78"></a> -<span class="sourceLineNo">079</span> this.currentScannerCallable = baseCallable;<a name="line.79"></a> -<span class="sourceLineNo">080</span> this.cConnection = cConnection;<a name="line.80"></a> -<span class="sourceLineNo">081</span> this.pool = pool;<a name="line.81"></a> -<span class="sourceLineNo">082</span> if (timeBeforeReplicas < 0) {<a name="line.82"></a> -<span class="sourceLineNo">083</span> throw new IllegalArgumentException("Invalid value of operation timeout on the primary");<a name="line.83"></a> -<span class="sourceLineNo">084</span> }<a name="line.84"></a> -<span class="sourceLineNo">085</span> this.timeBeforeReplicas = timeBeforeReplicas;<a name="line.85"></a> -<span class="sourceLineNo">086</span> this.scan = scan;<a name="line.86"></a> -<span class="sourceLineNo">087</span> this.retries = retries;<a name="line.87"></a> -<span class="sourceLineNo">088</span> this.tableName = tableName;<a name="line.88"></a> -<span class="sourceLineNo">089</span> this.conf = conf;<a name="line.89"></a> -<span class="sourceLineNo">090</span> this.scannerTimeout = scannerTimeout;<a name="line.90"></a> -<span class="sourceLineNo">091</span> this.caller = caller;<a name="line.91"></a> -<span class="sourceLineNo">092</span> }<a name="line.92"></a> -<span class="sourceLineNo">093</span><a name="line.93"></a> -<span class="sourceLineNo">094</span> public void setClose() {<a name="line.94"></a> -<span class="sourceLineNo">095</span> currentScannerCallable.setClose();<a name="line.95"></a> -<span class="sourceLineNo">096</span> }<a name="line.96"></a> -<span class="sourceLineNo">097</span><a name="line.97"></a> -<span class="sourceLineNo">098</span> public void setRenew(boolean val) {<a name="line.98"></a> -<span class="sourceLineNo">099</span> currentScannerCallable.setRenew(val);<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> public void setCaching(int caching) {<a name="line.102"></a> -<span class="sourceLineNo">103</span> currentScannerCallable.setCaching(caching);<a name="line.103"></a> -<span class="sourceLineNo">104</span> }<a name="line.104"></a> -<span class="sourceLineNo">105</span><a name="line.105"></a> -<span class="sourceLineNo">106</span> public int getCaching() {<a name="line.106"></a> -<span class="sourceLineNo">107</span> return currentScannerCallable.getCaching();<a name="line.107"></a> -<span class="sourceLineNo">108</span> }<a name="line.108"></a> -<span class="sourceLineNo">109</span><a name="line.109"></a> -<span class="sourceLineNo">110</span> public HRegionInfo getHRegionInfo() {<a name="line.110"></a> -<span class="sourceLineNo">111</span> return currentScannerCallable.getHRegionInfo();<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> public MoreResults moreResultsInRegion() {<a name="line.114"></a> -<span class="sourceLineNo">115</span> return currentScannerCallable.moreResultsInRegion();<a name="line.115"></a> -<span class="sourceLineNo">116</span> }<a name="line.116"></a> -<span class="sourceLineNo">117</span><a name="line.117"></a> -<span class="sourceLineNo">118</span> public MoreResults moreResultsForScan() {<a name="line.118"></a> -<span class="sourceLineNo">119</span> return currentScannerCallable.moreResultsForScan();<a name="line.119"></a> -<span class="sourceLineNo">120</span> }<a name="line.120"></a> -<span class="sourceLineNo">121</span><a name="line.121"></a> -<span class="sourceLineNo">122</span> @Override<a name="line.122"></a> -<span class="sourceLineNo">123</span> public Result [] call(int timeout) throws IOException {<a name="line.123"></a> -<span class="sourceLineNo">124</span> // If the active replica callable was closed somewhere, invoke the RPC to<a name="line.124"></a> -<span class="sourceLineNo">125</span> // really close it. In the case of regular scanners, this applies. We make couple<a name="line.125"></a> -<span class="sourceLineNo">126</span> // of RPCs to a RegionServer, and when that region is exhausted, we set<a name="line.126"></a> -<span class="sourceLineNo">127</span> // the closed flag. Then an RPC is required to actually close the scanner.<a name="line.127"></a> -<span class="sourceLineNo">128</span> if (currentScannerCallable != null && currentScannerCallable.closed) {<a name="line.128"></a> -<span class="sourceLineNo">129</span> // For closing we target that exact scanner (and not do replica fallback like in<a name="line.129"></a> -<span class="sourceLineNo">130</span> // the case of normal reads)<a name="line.130"></a> -<span class="sourceLineNo">131</span> if (LOG.isTraceEnabled()) {<a name="line.131"></a> -<span class="sourceLineNo">132</span> LOG.trace("Closing scanner id=" + currentScannerCallable.scannerId);<a name="line.132"></a> -<span class="sourceLineNo">133</span> }<a name="line.133"></a> -<span class="sourceLineNo">134</span> Result[] r = currentScannerCallable.call(timeout);<a name="line.134"></a> -<span class="sourceLineNo">135</span> currentScannerCallable = null;<a name="line.135"></a> -<span class="sourceLineNo">136</span> return r;<a name="line.136"></a> -<span class="sourceLineNo">137</span> }<a name="line.137"></a> -<span class="sourceLineNo">138</span> // We need to do the following:<a name="line.138"></a> -<span class="sourceLineNo">139</span> //1. When a scan goes out to a certain replica (default or not), we need to<a name="line.139"></a> -<span class="sourceLineNo">140</span> // continue to hit that until there is a failure. So store the last successfully invoked<a name="line.140"></a> -<span class="sourceLineNo">141</span> // replica<a name="line.141"></a> -<span class="sourceLineNo">142</span> //2. We should close the "losing" scanners (scanners other than the ones we hear back<a name="line.142"></a> -<span class="sourceLineNo">143</span> // from first)<a name="line.143"></a> -<span class="sourceLineNo">144</span> //<a name="line.144"></a> -<span class="sourceLineNo">145</span> RegionLocations rl = RpcRetryingCallerWithReadReplicas.getRegionLocations(true,<a name="line.145"></a> -<span class="sourceLineNo">146</span> RegionReplicaUtil.DEFAULT_REPLICA_ID, cConnection, tableName,<a name="line.146"></a> -<span class="sourceLineNo">147</span> currentScannerCallable.getRow());<a name="line.147"></a> -<span class="sourceLineNo">148</span><a name="line.148"></a> -<span class="sourceLineNo">149</span> // allocate a boundedcompletion pool of some multiple of number of replicas.<a name="line.149"></a> -<span class="sourceLineNo">150</span> // We want to accomodate some RPCs for redundant replica scans (but are still in progress)<a name="line.150"></a> -<span class="sourceLineNo">151</span> ResultBoundedCompletionService<Pair<Result[], ScannerCallable>> cs =<a name="line.151"></a> -<span class="sourceLineNo">152</span> new ResultBoundedCompletionService<>(<a name="line.152"></a> -<span class="sourceLineNo">153</span> RpcRetryingCallerFactory.instantiate(ScannerCallableWithReplicas.this.conf), pool,<a name="line.153"></a> -<span class="sourceLineNo">154</span> rl.size() * 5);<a name="line.154"></a> -<span class="sourceLineNo">155</span><a name="line.155"></a> -<span class="sourceLineNo">156</span> AtomicBoolean done = new AtomicBoolean(false);<a name="line.156"></a> -<span class="sourceLineNo">157</span> replicaSwitched.set(false);<a name="line.157"></a> -<span class="sourceLineNo">158</span> // submit call for the primary replica.<a name="line.158"></a> -<span class="sourceLineNo">159</span> addCallsForCurrentReplica(cs, rl);<a name="line.159"></a> -<span class="sourceLineNo">160</span> int startIndex = 0;<a name="line.160"></a> -<span class="sourceLineNo">161</span><a name="line.161"></a> -<span class="sourceLineNo">162</span> try {<a name="line.162"></a> -<span class="sourceLineNo">163</span> // wait for the timeout to see whether the primary responds back<a name="line.163"></a> -<span class="sourceLineNo">164</span> Future<Pair<Result[], ScannerCallable>> f = cs.poll(timeBeforeReplicas,<a name="line.164"></a> -<span class="sourceLineNo">165</span> TimeUnit.MICROSECONDS); // Yes, microseconds<a name="line.165"></a> -<span class="sourceLineNo">166</span> if (f != null) {<a name="line.166"></a> -<span class="sourceLineNo">167</span> // After poll, if f is not null, there must be a completed task<a name="line.167"></a> -<span class="sourceLineNo">168</span> Pair<Result[], ScannerCallable> r = f.get();<a name="line.168"></a> -<span class="sourceLineNo">169</span> if (r != null && r.getSecond() != null) {<a name="line.169"></a> -<span class="sourceLineNo">170</span> updateCurrentlyServingReplica(r.getSecond(), r.getFirst(), done, pool);<a name="line.170"></a> -<span class="sourceLineNo">171</span> }<a name="line.171"></a> -<span class="sourceLineNo">172</span> return r == null ? null : r.getFirst(); //great we got a response<a name="line.172"></a> -<span class="sourceLineNo">173</span> }<a name="line.173"></a> -<span class="sourceLineNo">174</span> } catch (ExecutionException e) {<a name="line.174"></a> -<span class="sourceLineNo">175</span> // We ignore the ExecutionException and continue with the replicas<a name="line.175"></a> -<span class="sourceLineNo">176</span> if (LOG.isDebugEnabled()) {<a name="line.176"></a> -<span class="sourceLineNo">177</span> LOG.debug("Scan with primary region returns " + e.getCause());<a name="line.177"></a> -<span class="sourceLineNo">178</span> }<a name="line.178"></a> -<span class="sourceLineNo">179</span><a name="line.179"></a> -<span class="sourceLineNo">180</span> // If rl's size is 1 or scan's consitency is strong, it needs to throw<a name="line.180"></a> -<span class="sourceLineNo">181</span> // out the exception from the primary replica<a name="line.181"></a> -<span class="sourceLineNo">182</span> if ((rl.size() == 1) || (scan.getConsistency() == Consistency.STRONG)) {<a name="line.182"></a> -<span class="sourceLineNo">183</span> // Rethrow the first exception<a name="line.183"></a> -<span class="sourceLineNo">184</span> RpcRetryingCallerWithReadReplicas.throwEnrichedException(e, retries);<a name="line.184"></a> -<span class="sourceLineNo">185</span> }<a name="line.185"></a> -<span class="sourceLineNo">186</span><a name="line.186"></a> -<span class="sourceLineNo">187</span> startIndex = 1;<a name="line.187"></a> -<span class="sourceLineNo">188</span> } catch (CancellationException e) {<a name="line.188"></a> -<span class="sourceLineNo">189</span> throw new InterruptedIOException(e.getMessage());<a name="line.189"></a> -<span class="sourceLineNo">190</span> } catch (InterruptedException e) {<a name="line.190"></a> -<span class="sourceLineNo">191</span> throw new InterruptedIOException(e.getMessage());<a name="line.191"></a> -<span class="sourceLineNo">192</span> }<a name="line.192"></a> -<span class="sourceLineNo">193</span><a name="line.193"></a> -<span class="sourceLineNo">194</span> // submit call for the all of the secondaries at once<a name="line.194"></a> -<span class="sourceLineNo">195</span> int endIndex = rl.size();<a name="line.195"></a> -<span class="sourceLineNo">196</span> if (scan.getConsistency() == Consistency.STRONG) {<a name="line.196"></a> -<span class="sourceLineNo">197</span> // When scan's consistency is strong, do not send to the secondaries<a name="line.197"></a> -<span class="sourceLineNo">198</span> endIndex = 1;<a name="line.198"></a> -<span class="sourceLineNo">199</span> } else {<a name="line.199"></a> -<span class="sourceLineNo">200</span> // TODO: this may be an overkill for large region replication<a name="line.200"></a> -<span class="sourceLineNo">201</span> addCallsForOtherReplicas(cs, rl, 0, rl.size() - 1);<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> try {<a name="line.204"></a> -<span class="sourceLineNo">205</span> Future<Pair<Result[], ScannerCallable>> f = cs.pollForFirstSuccessfullyCompletedTask(timeout,<a name="line.205"></a> -<span class="sourceLineNo">206</span> TimeUnit.MILLISECONDS, startIndex, endIndex);<a name="line.206"></a> -<span class="sourceLineNo">207</span><a name="line.207"></a> -<span class="sourceLineNo">208</span> if (f == null) {<a name="line.208"></a> -<span class="sourceLineNo">209</span> throw new IOException("Failed to get result within timeout, timeout=" + timeout + "ms");<a name="line.209"></a> -<span class="sourceLineNo">210</span> }<a name="line.210"></a> -<span class="sourceLineNo">211</span> Pair<Result[], ScannerCallable> r = f.get();<a name="line.211"></a> -<span class="sourceLineNo">212</span><a name="line.212"></a> -<span class="sourceLineNo">213</span> if (r != null && r.getSecond() != null) {<a name="line.213"></a> -<span class="sourceLineNo">214</span> updateCurrentlyServingReplica(r.getSecond(), r.getFirst(), done, pool);<a name="line.214"></a> -<span class="sourceLineNo">215</span> }<a name="line.215"></a> -<span class="sourceLineNo">216</span> return r == null ? null : r.getFirst(); // great we got an answer<a name="line.216"></a> -<span class="sourceLineNo">217</span><a name="line.217"></a> -<span class="sourceLineNo">218</span> } catch (ExecutionException e) {<a name="line.218"></a> -<span class="sourceLineNo">219</span> RpcRetryingCallerWithReadReplicas.throwEnrichedException(e, retries);<a name="line.219"></a> -<span class="sourceLineNo">220</span> } catch (CancellationException e) {<a name="line.220"></a> -<span class="sourceLineNo">221</span> throw new InterruptedIOException(e.getMessage());<a name="line.221"></a> -<span class="sourceLineNo">222</span> } catch (InterruptedException e) {<a name="line.222"></a> -<span class="sourceLineNo">223</span> throw new InterruptedIOException(e.getMessage());<a name="line.223"></a> -<span class="sourceLineNo">224</span> } finally {<a name="line.224"></a> -<span class="sourceLineNo">225</span> // We get there because we were interrupted or because one or more of the<a name="line.225"></a> -<span class="sourceLineNo">226</span> // calls succeeded or failed. In all case, we stop all our tasks.<a name="line.226"></a> -<span class="sourceLineNo">227</span> cs.cancelAll();<a name="line.227"></a> -<span class="sourceLineNo">228</span> }<a name="line.228"></a> -<span class="sourceLineNo">229</span> LOG.error("Imposible? Arrive at an unreachable line..."); // unreachable<a name="line.229"></a> -<span class="sourceLineNo">230</span> throw new IOException("Imposible? Arrive at an unreachable line...");<a name="line.230"></a> -<span class="sourceLineNo">231</span> }<a name="line.231"></a> -<span class="sourceLineNo">232</span><a name="line.232"></a> -<span class="sourceLineNo">233</span> private void updateCurrentlyServingReplica(ScannerCallable scanner, Result[] result,<a name="line.233"></a> -<span class="sourceLineNo">234</span> AtomicBoolean done, ExecutorService pool) {<a name="line.234"></a> -<span class="sourceLineNo">235</span> if (done.compareAndSet(false, true)) {<a name="line.235"></a> -<span class="sourceLineNo">236</span> if (currentScannerCallable != scanner) replicaSwitched.set(true);<a name="line.236"></a> -<span class="sourceLineNo">237</span> currentScannerCallable = scanner;<a name="line.237"></a> -<span class="sourceLineNo">238</span> // store where to start the replica scanner from if we need to.<a name="line.238"></a> -<span class="sourceLineNo">239</span> if (result != null && result.length != 0) this.lastResult = result[result.length - 1];<a name="line.239"></a> -<span class="sourceLineNo">240</span> if (LOG.isTraceEnabled()) {<a name="line.240"></a> -<span class="sourceLineNo">241</span> LOG.trace("Setting current scanner as id=" + currentScannerCallable.scannerId +<a name="line.241"></a> -<span class="sourceLineNo">242</span> " associated with replica=" + currentScannerCallable.getHRegionInfo().getReplicaId());<a name="line.242"></a> -<span class="sourceLineNo">243</span> }<a name="line.243"></a> -<span class="sourceLineNo">244</span> // close all outstanding replica scanners but the one we heard back from<a name="line.244"></a> -<span class="sourceLineNo">245</span> outstandingCallables.remove(scanner);<a name="line.245"></a> -<span class="sourceLineNo">246</span> for (ScannerCallable s : outstandingCallables) {<a name="line.246"></a> -<span class="sourceLineNo">247</span> if (LOG.isTraceEnabled()) {<a name="line.247"></a> -<span class="sourceLineNo">248</span> LOG.trace("Closing scanner id=" + s.scannerId +<a name="line.248"></a> -<span class="sourceLineNo">249</span> ", replica=" + s.getHRegionInfo().getRegionId() +<a name="line.249"></a> -<span class="sourceLineNo">250</span> " because slow and replica=" +<a name="line.250"></a> -<span class="sourceLineNo">251</span> this.currentScannerCallable.getHRegionInfo().getReplicaId() + " succeeded");<a name="line.251"></a> -<span class="sourceLineNo">252</span> }<a name="line.252"></a> -<span class="sourceLineNo">253</span> // Submit the "close" to the pool since this might take time, and we don't<a name="line.253"></a> -<span class="sourceLineNo">254</span> // want to wait for the "close" to happen yet. The "wait" will happen when<a name="line.254"></a> -<span class="sourceLineNo">255</span> // the table is closed (when the awaitTermination of the underlying pool is called)<a name="line.255"></a> -<span class="sourceLineNo">256</span> s.setClose();<a name="line.256"></a> -<span class="sourceLineNo">257</span> final RetryingRPC r = new RetryingRPC(s);<a name="line.257"></a> -<span class="sourceLineNo">258</span> pool.submit(new Callable<Void>(){<a name="line.258"></a> -<span class="sourceLineNo">259</span> @Override<a name="line.259"></a> -<span class="sourceLineNo">260</span> public Void call() throws Exception {<a name="line.260"></a> -<span class="sourceLineNo">261</span> r.call(scannerTimeout);<a name="line.261"></a> -<span class="sourceLineNo">262</span> return null;<a name="line.262"></a> -<span class="sourceLineNo">263</span> }<a name="line.263"></a> -<span class="sourceLineNo">264</span> });<a name="line.264"></a> -<span class="sourceLineNo">265</span> }<a name="line.265"></a> -<span class="sourceLineNo">266</span> // now clear outstandingCallables since we scheduled a close for all the contained scanners<a name="line.266"></a> -<span class="sourceLineNo">267</span> outstandingCallables.clear();<a name="line.267"></a> -<span class="sourceLineNo">268</span> }<a name="line.268"></a> -<span class="sourceLineNo">269</span> }<a name="line.269"></a> -<span class="sourceLineNo">270</span><a name="line.270"></a> -<span class="sourceLineNo">271</span> /**<a name="line.271"></a> -<span class="sourceLineNo">272</span> * When a scanner switches in the middle of scanning (the 'next' call fails<a name="line.272"></a> -<span class="sourceLineNo">273</span> * for example), the upper layer {@link ClientScanner} needs to know<a name="line.273"></a> -<span class="sourceLineNo">274</span> */<a name="line.274"></a> -<span class="sourceLineNo">275</span> public boolean switchedToADifferentReplica() {<a name="line.275"></a> -<span class="sourceLineNo">276</span> return replicaSwitched.get();<a name="line.276"></a> -<span class="sourceLineNo">277</span> }<a name="line.277"></a> -<span class="sourceLineNo">278</span><a name="line.278"></a> -<span class="sourceLineNo">279</span> /**<a name="line.279"></a> -<span class="sourceLineNo">280</span> * @return true when the most recent RPC response indicated that the response was a heartbeat<a name="line.280"></a> -<span class="sourceLineNo">281</span> * message. Heartbeat messages are sent back from the server when the processing of the<a name="line.281"></a> -<span class="sourceLineNo">282</span> * scan request exceeds a certain time threshold. Heartbeats allow the server to avoid<a name="line.282"></a> -<span class="sourceLineNo">283</span> * timeouts during long running scan operations.<a name="line.283"></a> -<span class="sourceLineNo">284</span> */<a name="line.284"></a> -<span class="sourceLineNo">285</span> public boolean isHeartbeatMessage() {<a name="line.285"></a> -<span class="sourceLineNo">286</span> return currentScannerCallable != null && currentScannerCallable.isHeartbeatMessage();<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> private void addCallsForCurrentReplica(<a name="line.289"></a> -<span class="sourceLineNo">290</span> ResultBoundedCompletionService<Pair<Result[], ScannerCallable>> cs, RegionLocations rl) {<a name="line.290"></a> -<span class="sourceLineNo">291</span> RetryingRPC retryingOnReplica = new RetryingRPC(currentScannerCallable);<a name="line.291"></a> -<span class="sourceLineNo">292</span> outstandingCallables.add(currentScannerCallable);<a name="line.292"></a> -<span class="sourceLineNo">293</span> cs.submit(retryingOnReplica, scannerTimeout, currentScannerCallable.id);<a name="line.293"></a> -<span class="sourceLineNo">294</span> }<a name="line.294"></a> -<span class="sourceLineNo">295</span><a name="line.295"></a> -<span class="sourceLineNo">296</span> private void addCallsForOtherReplicas(<a name="line.296"></a> -<span class="sourceLineNo">297</span> ResultBoundedCompletionService<Pair<Result[], ScannerCallable>> cs, RegionLocations rl,<a name="line.297"></a> -<span class="sourceLineNo">298</span> int min, int max) {<a name="line.298"></a> -<span class="sourceLineNo">299</span><a name="line.299"></a> -<span class="sourceLineNo">300</span> for (int id = min; id <= max; id++) {<a name="line.300"></a> -<span class="sourceLineNo">301</span> if (currentScannerCallable.id == id) {<a name="line.301"></a> -<span class="sourceLineNo">302</span> continue; //this was already scheduled earlier<a name="line.302"></a> -<span class="sourceLineNo">303</span> }<a name="line.303"></a> -<span class="sourceLineNo">304</span> ScannerCallable s = currentScannerCallable.getScannerCallableForReplica(id);<a name="line.304"></a> -<span class="sourceLineNo">305</span> setStartRowForReplicaCallable(s);<a name="line.305"></a> -<span class="sourceLineNo">306</span> outstandingCallables.add(s);<a name="line.306"></a> -<span class="sourceLineNo">307</span> RetryingRPC retryingOnReplica = new RetryingRPC(s);<a name="line.307"></a> -<span class="sourceLineNo">308</span> cs.submit(retryingOnReplica, scannerTimeout, id);<a name="line.308"></a> -<span class="sourceLineNo">309</span> }<a name="line.309"></a> +<span class="sourceLineNo">038</span>import org.apache.hadoop.hbase.DoNotRetryIOException;<a name="line.38"></a> +<span class="sourceLineNo">039</span>import org.apache.hadoop.hbase.HRegionInfo;<a name="line.39"></a> +<span class="sourceLineNo">040</span>import org.apache.hadoop.hbase.RegionLocations;<a name="line.40"></a> +<span class="sourceLineNo">041</span>import org.apache.hadoop.hbase.TableName;<a name="line.41"></a> +<span class="sourceLineNo">042</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.42"></a> +<span class="sourceLineNo">043</span>import org.apache.hadoop.hbase.client.ScannerCallable.MoreResults;<a name="line.43"></a> +<span class="sourceLineNo">044</span>import org.apache.hadoop.hbase.util.Pair;<a name="line.44"></a> +<span class="sourceLineNo">045</span><a name="line.45"></a> +<span class="sourceLineNo">046</span>/**<a name="line.46"></a> +<span class="sourceLineNo">047</span> * This class has the logic for handling scanners for regions with and without replicas.<a name="line.47"></a> +<span class="sourceLineNo">048</span> * 1. A scan is attempted on the default (primary) region<a name="line.48"></a> +<span class="sourceLineNo">049</span> * 2. The scanner sends all the RPCs to the default region until it is done, or, there<a name="line.49"></a> +<span class="sourceLineNo">050</span> * is a timeout on the default (a timeout of zero is disallowed).<a name="line.50"></a> +<span class="sourceLineNo">051</span> * 3. If there is a timeout in (2) above, scanner(s) is opened on the non-default replica(s)<a name="line.51"></a> +<span class="sourceLineNo">052</span> * 4. The results from the first successful scanner are taken, and it is stored which server<a name="line.52"></a> +<span class="sourceLineNo">053</span> * returned the results.<a name="line.53"></a> +<span class="sourceLineNo">054</span> * 5. The next RPCs are done on the above stored server until it is done or there is a timeout,<a name="line.54"></a> +<span class="sourceLineNo">055</span> * in which case, the other replicas are queried (as in (3) above).<a name="line.55"></a> +<span class="sourceLineNo">056</span> *<a name="line.56"></a> +<span class="sourceLineNo">057</span> */<a name="line.57"></a> +<span class="sourceLineNo">058</span>@InterfaceAudience.Private<a name="line.58"></a> +<span class="sourceLineNo">059</span>class ScannerCallableWithReplicas implements RetryingCallable<Result[]> {<a name="line.59"></a> +<span class="sourceLineNo">060</span> private static final Log LOG = LogFactory.getLog(ScannerCallableWithReplicas.class);<a name="line.60"></a> +<span class="sourceLineNo">061</span> volatile ScannerCallable currentScannerCallable;<a name="line.61"></a> +<span class="sourceLineNo">062</span> AtomicBoolean replicaSwitched = new AtomicBoolean(false);<a name="line.62"></a> +<span class="sourceLineNo">063</span> final ClusterConnection cConnection;<a name="line.63"></a> +<span class="sourceLineNo">064</span> protected final ExecutorService pool;<a name="line.64"></a> +<span class="sourceLineNo">065</span> protected final int timeBeforeReplicas;<a name="line.65"></a> +<span class="sourceLineNo">066</span> private final Scan scan;<a name="line.66"></a> +<span class="sourceLineNo">067</span> private final int retries;<a name="line.67"></a> +<span class="sourceLineNo">068</span> private Result lastResult;<a name="line.68"></a> +<span class="sourceLineNo">069</span> private final RpcRetryingCaller<Result[]> caller;<a name="line.69"></a> +<span class="sourceLineNo">070</span> private final TableName tableName;<a name="line.70"></a> +<span class="sourceLineNo">071</span> private Configuration conf;<a name="line.71"></a> +<span class="sourceLineNo">072</span> private int scannerTimeout;<a name="line.72"></a> +<span class="sourceLineNo">073</span> private Set<ScannerCallable> outstandingCallables = new HashSet<>();<a name="line.73"></a> +<span class="sourceLineNo">074</span> private boolean someRPCcancelled = false; //required for testing purposes only<a name="line.74"></a> +<span class="sourceLineNo">075</span><a name="line.75"></a> +<span class="sourceLineNo">076</span> public ScannerCallableWithReplicas(TableName tableName, ClusterConnection cConnection,<a name="line.76"></a> +<span class="sourceLineNo">077</span> ScannerCallable baseCallable, ExecutorService pool, int timeBeforeReplicas, Scan scan,<a name="line.77"></a> +<span class="sourceLineNo">078</span> int retries, int scannerTimeout, int caching, Configuration conf,<a name="line.78"></a> +<span class="sourceLineNo">079</span> RpcRetryingCaller<Result []> caller) {<a name="line.79"></a> +<span class="sourceLineNo">080</span> this.currentScannerCallable = baseCallable;<a name="line.80"></a> +<span class="sourceLineNo">081</span> this.cConnection = cConnection;<a name="line.81"></a> +<span class="sourceLineNo">082</span> this.pool = pool;<a name="line.82"></a> +<span class="sourceLineNo">083</span> if (timeBeforeReplicas < 0) {<a name="line.83"></a> +<span class="sourceLineNo">084</span> throw new IllegalArgumentException("Invalid value of operation timeout on the primary");<a name="line.84"></a> +<span class="sourceLineNo">085</span> }<a name="line.85"></a> +<span class="sourceLineNo">086</span> this.timeBeforeReplicas = timeBeforeReplicas;<a name="line.86"></a> +<span class="sourceLineNo">087</span> this.scan = scan;<a name="line.87"></a> +<span class="sourceLineNo">088</span> this.retries = retries;<a name="line.88"></a> +<span class="sourceLineNo">089</span> this.tableName = tableName;<a name="line.89"></a> +<span class="sourceLineNo">090</span> this.conf = conf;<a name="line.90"></a> +<span class="sourceLineNo">091</span> this.scannerTimeout = scannerTimeout;<a name="line.91"></a> +<span class="sourceLineNo">092</span> this.caller = caller;<a name="line.92"></a> +<span class="sourceLineNo">093</span> }<a name="line.93"></a> +<span class="sourceLineNo">094</span><a name="line.94"></a> +<span class="sourceLineNo">095</span> public void setClose() {<a name="line.95"></a> +<span class="sourceLineNo">096</span> currentScannerCallable.setClose();<a name="line.96"></a> +<span class="sourceLineNo">097</span> }<a name="line.97"></a> +<span class="sourceLineNo">098</span><a name="line.98"></a> +<span class="sourceLineNo">099</span> public void setRenew(boolean val) {<a name="line.99"></a> +<span class="sourceLineNo">100</span> currentScannerCallable.setRenew(val);<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> public void setCaching(int caching) {<a name="line.103"></a> +<span class="sourceLineNo">104</span> currentScannerCallable.setCaching(caching);<a name="line.104"></a> +<span class="sourceLineNo">105</span> }<a name="line.105"></a> +<span class="sourceLineNo">106</span><a name="line.106"></a> +<span class="sourceLineNo">107</span> public int getCaching() {<a name="line.107"></a> +<span class="sourceLineNo">108</span> return currentScannerCallable.getCaching();<a name="line.108"></a> +<span class="sourceLineNo">109</span> }<a name="line.109"></a> +<span class="sourceLineNo">110</span><a name="line.110"></a> +<span class="sourceLineNo">111</span> public HRegionInfo getHRegionInfo() {<a name="line.111"></a> +<span class="sourceLineNo">112</span> return currentScannerCallable.getHRegionInfo();<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> public MoreResults moreResultsInRegion() {<a name="line.115"></a> +<span class="sourceLineNo">116</span> return currentScannerCallable.moreResultsInRegion();<a name="line.116"></a> +<span class="sourceLineNo">117</span> }<a name="line.117"></a> +<span class="sourceLineNo">118</span><a name="line.118"></a> +<span class="sourceLineNo">119</span> public MoreResults moreResultsForScan() {<a name="line.119"></a> +<span class="sourceLineNo">120</span> return currentScannerCallable.moreResultsForScan();<a name="line.120"></a> +<span class="sourceLineNo">121</span> }<a name="line.121"></a> +<span class="sourceLineNo">122</span><a name="line.122"></a> +<span class="sourceLineNo">123</span> @Override<a name="line.123"></a> +<span class="sourceLineNo">124</span> public Result [] call(int timeout) throws IOException {<a name="line.124"></a> +<span class="sourceLineNo">125</span> // If the active replica callable was closed somewhere, invoke the RPC to<a name="line.125"></a> +<span class="sourceLineNo">126</span> // really close it. In the case of regular scanners, this applies. We make couple<a name="line.126"></a> +<span class="sourceLineNo">127</span> // of RPCs to a RegionServer, and when that region is exhausted, we set<a name="line.127"></a> +<span class="sourceLineNo">128</span> // the closed flag. Then an RPC is required to actually close the scanner.<a name="line.128"></a> +<span class="sourceLineNo">129</span> if (currentScannerCallable != null && currentScannerCallable.closed) {<a name="line.129"></a> +<span class="sourceLineNo">130</span> // For closing we target that exact scanner (and not do replica fallback like in<a name="line.130"></a> +<span class="sourceLineNo">131</span> // the case of normal reads)<a name="line.131"></a> +<span class="sourceLineNo">132</span> if (LOG.isTraceEnabled()) {<a name="line.132"></a> +<span class="sourceLineNo">133</span> LOG.trace("Closing scanner id=" + currentScannerCallable.scannerId);<a name="line.133"></a> +<span class="sourceLineNo">134</span> }<a name="line.134"></a> +<span class="sourceLineNo">135</span> Result[] r = currentScannerCallable.call(timeout);<a name="line.135"></a> +<span class="sourceLineNo">136</span> currentScannerCallable = null;<a name="line.136"></a> +<span class="sourceLineNo">137</span> return r;<a name="line.137"></a> +<span class="sourceLineNo">138</span> }<a name="line.138"></a> +<span class="sourceLineNo">139</span> // We need to do the following:<a name="line.139"></a> +<span class="sourceLineNo">140</span> //1. When a scan goes out to a certain replica (default or not), we need to<a name="line.140"></a> +<span class="sourceLineNo">141</span> // continue to hit that until there is a failure. So store the last successfully invoked<a name="line.141"></a> +<span class="sourceLineNo">142</span> // replica<a name="line.142"></a> +<span class="sourceLineNo">143</span> //2. We should close the "losing" scanners (scanners other than the ones we hear back<a name="line.143"></a> +<span class="sourceLineNo">144</span> // from first)<a name="line.144"></a> +<span class="sourceLineNo">145</span> //<a name="line.145"></a> +<span class="sourceLineNo">146</span> RegionLocations rl = null;<a name="line.146"></a> +<span class="sourceLineNo">147</span> try {<a name="line.147"></a> +<span class="sourceLineNo">148</span> rl = RpcRetryingCallerWithReadReplicas.getRegionLocations(true,<a name="line.148"></a> +<span class="sourceLineNo">149</span> RegionReplicaUtil.DEFAULT_REPLICA_ID, cConnection, tableName,<a name="line.149"></a> +<span class="sourceLineNo">150</span> currentScannerCallable.getRow());<a name="line.150"></a> +<span class="sourceLineNo">151</span> } catch (RetriesExhaustedException | DoNotRetryIOException e) {<a name="line.151"></a> +<span class="sourceLineNo">152</span> // We cannot get the primary replica region location, it is possible that the region server<a name="line.152"></a> +<span class="sourceLineNo">153</span> // hosting meta table is down, it needs to proceed to try cached replicas directly.<a name="line.153"></a> +<span class="sourceLineNo">154</span> if (cConnection instanceof ConnectionImplementation) {<a name="line.154"></a> +<span class="sourceLineNo">155</span> rl = ((ConnectionImplementation) cConnection)<a name="line.155"></a> +<span class="sourceLineNo">156</span> .getCachedLocation(tableName, currentScannerCallable.getRow());<a name="line.156"></a> +<span class="sourceLineNo">157</span> if (rl == null) {<a name="line.157"></a> +<span class="sourceLineNo">158</span> throw e;<a name="line.158"></a> +<span class="sourceLineNo">159</span> }<a name="line.159"></a> +<span class="sourceLineNo">160</span> } else {<a name="line.160"></a> +<span class="sourceLineNo">161</span> // For completeness<a name="line.161"></a> +<span class="sourceLineNo">162</span> throw e;<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> // allocate a boundedcompletion pool of some multiple of number of replicas.<a name="line.165"></a> +<span class="sourceLineNo">166</span> // We want to accomodate some RPCs for redundant replica scans (but are still in progress)<a name="line.166"></a> +<span class="sourceLineNo">167</span> ResultBoundedCompletionService<Pair<Result[], ScannerCallable>> cs =<a name="line.167"></a> +<span class="sourceLineNo">168</span> new ResultBoundedCompletionService<>(<a name="line.168"></a> +<span class="sourceLineNo">169</span> RpcRetryingCallerFactory.instantiate(ScannerCallableWithReplicas.this.conf), pool,<a name="line.169"></a> +<span class="sourceLineNo">170</span> rl.size() * 5);<a name="line.170"></a> +<span class="sourceLineNo">171</span><a name="line.171"></a> +<span class="sourceLineNo">172</span> AtomicBoolean done = new AtomicBoolean(false);<a name="line.172"></a> +<span class="sourceLineNo">173</span> replicaSwitched.set(false);<a name="line.173"></a> +<span class="sourceLineNo">174</span> // submit call for the primary replica.<a name="line.174"></a> +<span class="sourceLineNo">175</span> addCallsForCurrentReplica(cs, rl);<a name="line.175"></a> +<span class="sourceLineNo">176</span> int startIndex = 0;<a name="line.176"></a> +<span class="sourceLineNo">177</span><a name="line.177"></a> +<span class="sourceLineNo">178</span> try {<a name="line.178"></a> +<span class="sourceLineNo">179</span> // wait for the timeout to see whether the primary responds back<a name="line.179"></a> +<span class="sourceLineNo">180</span> Future<Pair<Result[], ScannerCallable>> f = cs.poll(timeBeforeReplicas,<a name="line.180"></a> +<span class="sourceLineNo">181</span> TimeUnit.MICROSECONDS); // Yes, microseconds<a name="line.181"></a> +<span class="sourceLineNo">182</span> if (f != null) {<a name="line.182"></a> +<span class="sourceLineNo">183</span> // After poll, if f is not null, there must be a completed task<a name="line.183"></a> +<span class="sourceLineNo">184</span> Pair<Result[], ScannerCallable> r = f.get();<a name="line.184"></a> +<span class="sourceLineNo">185</span> if (r != null && r.getSecond() != null) {<a name="line.185"></a> +<span class="sourceLineNo">186</span> updateCurrentlyServingReplica(r.getSecond(), r.getFirst(), done, pool);<a name="line.186"></a> +<span class="sourceLineNo">187</span> }<a name="line.187"></a> +<span class="sourceLineNo">188</span> return r == null ? null : r.getFirst(); //great we got a response<a name="line.188"></a> +<span class="sourceLineNo">189</span> }<a name="line.189"></a> +<span class="sourceLineNo">190</span> } catch (ExecutionException e) {<a name="line.190"></a> +<span class="sourceLineNo">191</span> // We ignore the ExecutionException and continue with the replicas<a name="line.191"></a> +<span class="sourceLineNo">192</span> if (LOG.isDebugEnabled()) {<a name="line.192"></a> +<span class="sourceLineNo">193</span> LOG.debug("Scan with primary region returns " + e.getCause());<a name="line.193"></a> +<span class="sourceLineNo">194</span> }<a name="line.194"></a> +<span class="sourceLineNo">195</span><a name="line.195"></a> +<span class="sourceLineNo">196</span> // If rl's size is 1 or scan's consitency is strong, it needs to throw<a name="line.196"></a> +<span class="sourceLineNo">197</span> // out the exception from the primary replica<a name="line.197"></a> +<span class="sourceLineNo">198</span> if ((rl.size() == 1) || (scan.getConsistency() == Consistency.STRONG)) {<a name="line.198"></a> +<span class="sourceLineNo">199</span> // Rethrow the first exception<a name="line.199"></a> +<span class="sourceLineNo">200</span> RpcRetryingCallerWithReadReplicas.throwEnrichedException(e, retries);<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> startIndex = 1;<a name="line.203"></a> +<span class="sourceLineNo">204</span> } catch (CancellationException e) {<a name="line.204"></a> +<span class="sourceLineNo">205</span> throw new InterruptedIOException(e.getMessage());<a name="line.205"></a> +<span class="sourceLineNo">206</span> } catch (InterruptedException e) {<a name="line.206"></a> +<span class="sourceLineNo">207</span> throw new InterruptedIOException(e.getMessage());<a name="line.207"></a> +<span class="sourceLineNo">208</span> }<a name="line.208"></a> +<span class="sourceLineNo">209</span><a name="line.209"></a> +<span class="sourceLineNo">210</span> // submit call for the all of the secondaries at once<a name="line.210"></a> +<span class="sourceLineNo">211</span> int endIndex = rl.size();<a name="line.211"></a> +<span class="sourceLineNo">212</span> if (scan.getConsistency() == Consistency.STRONG) {<a name="line.212"></a> +<span class="sourceLineNo">213</span> // When scan's consistency is strong, do not send to the secondaries<a name="line.213"></a> +<span class="sourceLineNo">214</span> endIndex = 1;<a name="line.214"></a> +<span class="sourceLineNo">215</span> } else {<a name="line.215"></a> +<span class="sourceLineNo">216</span> // TODO: this may be an overkill for large region replication<a name="line.216"></a> +<span class="sourceLineNo">217</span> addCallsForOtherReplicas(cs, rl, 0, rl.size() - 1);<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> Future<Pair<Result[], ScannerCallable>> f = cs.pollForFirstSuccessfullyCompletedTask(timeout,<a name="line.221"></a> +<span class="sourceLineNo">222</span> TimeUnit.MILLISECONDS, startIndex, endIndex);<a name="line.222"></a> +<span class="sourceLineNo">223</span><a name="line.223"></a> +<span class="sourceLineNo">224</span> if (f == null) {<a name="line.224"></a> +<span class="sourceLineNo">225</span> throw new IOException("Failed to get result within timeout, timeout=" + timeout + "ms");<a name="line.225"></a> +<span class="sourceLineNo">226</span> }<a name="line.226"></a> +<span class="sourceLineNo">227</span> Pair<Result[], ScannerCallable> r = f.get();<a name="line.227"></a> +<span class="sourceLineNo">228</span><a name="line.228"></a> +<span class="sourceLineNo">229</span> if (r != null && r.getSecond() != null) {<a name="line.229"></a> +<span class="sourceLineNo">230</span> updateCurrentlyServingReplica(r.getSecond(), r.getFirst(), done, pool);<a name="line.230"></a> +<span class="sourceLineNo">231</span> }<a name="line.231"></a> +<span class="sourceLineNo">232</span> return r == null ? null : r.getFirst(); // great we got an answer<a name="line.232"></a> +<span class="sourceLineNo">233</span><a name="line.233"></a> +<span class="sourceLineNo">234</span> } catch (ExecutionException e) {<a name="line.234"></a> +<span class="sourceLineNo">235</span> RpcRetryingCallerWithReadReplicas.throwEnrichedException(e, retries);<a name="line.235"></a> +<span class="sourceLineNo">236</span> } catch (CancellationException e) {<a name="line.236"></a> +<span class="sourceLineNo">237</span> throw new InterruptedIOException(e.getMessage());<a name="line.237"></a> +<span class="sourceLineNo">238</span> } catch (InterruptedException e) {<a name="line.238"></a> +<span class="sourceLineNo">239</span> throw new InterruptedIOException(e.getMessage());<a name="line.239"></a> +<span class="sourceLineNo">240</span> } finally {<a name="line.240"></a> +<span class="sourceLineNo">241</span> // We get there because we were interrupted or because one or more of the<a name="line.241"></a> +<span class="sourceLineNo">242</span> // calls succeeded or failed. In all case, we stop all our tasks.<a name="line.242"></a> +<span class="sourceLineNo">243</span> cs.cancelAll();<a name="line.243"></a> +<span class="sourceLineNo">244</span> }<a name="line.244"></a> +<span class="sourceLineNo">245</span> LOG.error("Imposible? Arrive at an unreachable line..."); // unreachable<a name="line.245"></a> +<span class="sourceLineNo">246</span> throw new IOException("Imposible? Arrive at an unreachable line...");<a name="line.246"></a> +<span class="sourceLineNo">247</span> }<a name="line.247"></a> +<span class="sourceLineNo">248</span><a name="line.248"></a> +<span class="sourceLineNo">249</span> private void updateCurrentlyServingReplica(ScannerCallable scanner, Result[] result,<a name="line.249"></a> +<span class="sourceLineNo">250</span> AtomicBoolean done, ExecutorService pool) {<a name="line.250"></a> +<span class="sourceLineNo">251</span> if (done.compareAndSet(false, true)) {<a name="line.251"></a> +<span class="sourceLineNo">252</span> if (currentScannerCallable != scanner) replicaSwitched.set(true);<a name="line.252"></a> +<span class="sourceLineNo">253</span> currentScannerCallable = scanner;<a name="line.253"></a> +<span class="sourceLineNo">254</span> // store where to start the replica scanner from if we need to.<a name="line.254"></a> +<span class="sourceLineNo">255</span> if (result != null && result.length != 0) this.lastResult = result[result.length - 1];<a name="line.255"></a> +<span class="sourceLineNo">256</span> if (LOG.isTraceEnabled()) {<a name="line.256"></a> +<span class="sourceLineNo">257</span> LOG.trace("Setting current scanner as id=" + currentScannerCallable.scannerId +<a name="line.257"></a> +<span class="sourceLineNo">258</span> " associated with replica=" + currentScannerCallable.getHRegionInfo().getReplicaId());<a name="line.258"></a> +<span class="sourceLineNo">259</span> }<a name="line.259"></a> +<span class="sourceLineNo">260</span> // close all outstanding replica scanners but the one we heard back from<a name="line.260"></a> +<span class="sourceLineNo">261</span> outstandingCallables.remove(scanner);<a name="line.261"></a> +<span class="sourceLineNo">262</span> for (ScannerCallable s : outstandingCallables) {<a name="line.262"></a> +<span class="sourceLineNo">263</span> if (LOG.isTraceEnabled()) {<a name="line.263"></a> +<span class="sourceLineNo">264</span> LOG.trace("Closing scanner id=" + s.scannerId +<a name="line.264"></a> +<span class="sourceLineNo">265</span> ", replica=" + s.getHRegionInfo().getRegionId() +<a name="line.265"></a> +<span class="sourceLineNo">266</span> " because slow and replica=" +<a name="line.266"></a> +<span class="sourceLineNo">267</span> this.currentScannerCallable.getHRegionInfo().getReplicaId() + " succeeded");<a name="line.267"></a> +<span class="sourceLineNo">268</span> }<a name="line.268"></a> +<span class="sourceLineNo">269</span> // Submit the "close" to the pool since this might take time, and we don't<a name="line.269"></a> +<span class="sourceLineNo">270</span> // want to wait for the "close" to happen yet. The "wait" will happen when<a name="line.270"></a> +<span class="sourceLineNo">271</span> // the table is closed (when the awaitTermination of the underlying pool is called)<a name="line.271"></a> +<span class="sourceLineNo">272</span> s.setClose();<a name="line.272"></a> +<span class="sourceLineNo">273</span> final RetryingRPC r = new RetryingRPC(s);<a name="line.273"></a> +<span class="sourceLineNo">274</span> pool.submit(new Callable<Void>(){<a name="line.274"></a> +<span class="sourceLineNo">275</span> @Override<a name="line.275"></a> +<span class="sourceLineNo">276</span> public Void call() throws Exception {<a name="line.276"></a> +<span class="sourceLineNo">277</span> r.call(scannerTimeout);<a name="line.277"></a> +<span class="sourceLineNo">278</span> return null;<a name="line.278"></a> +<span class="sourceLineNo">279</span> }<a name="line.279"></a> +<span class="sourceLineNo">280</span> });<a name="line.280"></a> +<span class="sourceLineNo">281</span> }<a name="line.281"></a> +<span class="sourceLineNo">282</span> // now clear outstandingCallables since we scheduled a close for all the contained scanners<a name="line.282"></a> +<span class="sourceLineNo">283</span> outstandingCallables.clear();<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> * When a scanner switches in the middle of scanning (the 'next' call fails<a name="line.288"></a> +<span class="sourceLineNo">289</span> * for example), the upper layer {@link ClientScanner} needs to know<a name="line.289"></a> +<span class="sourceLineNo">290</span> */<a name="line.290"></a> +<span class="sourceLineNo">291</span> public boolean switchedToADifferentReplica() {<a name="line.291"></a> +<span class="sourceLineNo">292</span> return replicaSwitched.get();<a name="line.292"></a> +<span class="sourceLineNo">293</span> }<a name="line.293"></a> +<span class="sourceLineNo">294</span><a name="line.294"></a> +<span class="sourceLineNo">295</span> /**<a name="line.295"></a> +<span class="sourceLineNo">296</span> * @return true when the most recent RPC response indicated that the response was a heartbeat<a name="line.296"></a> +<span class="sourceLineNo">297</span> * message. Heartbeat messages are sent back from the server when the processing of the<a name="line.297"></a> +<span class="sourceLineNo">298</span> * scan request exceeds a certain time threshold. Heartbeats allow the server to avoid<a name="line.298"></a> +<span class="sourceLineNo">299</span> * timeouts during long running scan operations.<a name="line.299"></a> +<span class="sourceLineNo">300</span> */<a name="line.300"></a> +<span class="sourceLineNo">301</span> public boolean isHeartbeatMessage() {<a name="line.301"></a> +<span class="sourceLineNo">302</span> return currentScannerCallable != null && currentScannerCallable.isHeartbeatMessage();<a name="line.302"></a> +<span class="sourceLineNo">303</span> }<a name="line.303"></a> +<span class="sourceLineNo">304</span><a name="line.304"></a> +<span class="sourceLineNo">305</span> private void addCallsForCurrentReplica(<a name="line.305"></a> +<span class="sourceLineNo">306</span> ResultBoundedCompletionService<Pair<Result[], ScannerCallable>> cs, RegionLocations rl) {<a name="line.306"></a> +<span class="sourceLineNo">307</span> RetryingRPC retryingOnReplica = new RetryingRPC(currentScannerCallable);<a name="line.307"></a> +<span class="sourceLineNo">308</span> outstandingCallables.add(currentScannerCallable);<a name="line.308"></a> +<span class="sourceLineNo">309</span> cs.submit(retryingOnReplica, scannerTimeout, currentScannerCallable.id);<a name="line.309"></a> <span class="sourceLineNo">310</span> }<a name="line.310"></a> <span class="sourceLineNo">311</span><a name="line.311"></a> -<span class="sourceLineNo">312</span> /**<a name="line.312"></a> -<span class="sourceLineNo">313</span> * Set the start row for the replica callable based on the state of the last result received.<a name="line.313"></a> -<span class="sourceLineNo">314</span> * @param callable The callable to set the start row on<a name="line.314"></a> -<span class="sourceLineNo">315</span> */<a name="line.315"></a> -<span class="sourceLineNo">316</span> private void setStartRowForReplicaCallable(ScannerCallable callable) {<a name="line.316"></a> -<span class="sourceLineNo">317</span> if (this.lastResult == null || callable == null) {<a name="line.317"></a> -<span class="sourceLineNo">318</span> return;<a name="line.318"></a> -<span class="sourceLineNo">319</span> }<a name="line.319"></a> -<span class="sourceLineNo">320</span> // 1. The last result was a partial result which means we have not received all of the cells<a name="line.320"></a> -<span class="sourceLineNo">321</span> // for this row. Thus, use the last result's row as the start row. If a replica switch<a name="line.321"></a> -<span class="sourceLineNo">322</span> // occurs, the scanner will ensure that any accumulated partial results are cleared,<a name="line.322"></a> -<span class="sourceLineNo">323</span> // and the scan can resume from this row.<a name="line.323"></a> -<span class="sourceLineNo">324</span> // 2. The last result was not a partial result which means it contained all of the cells for<a name="line.324"></a> -<span class="sourceLineNo">325</span> // that row (we no longer need any information from it). Set the start row to the next<a name="line.325"></a> -<span class="sourceLineNo">326</span> // closest row that could be seen.<a name="line.326"></a> -<span class="sourceLineNo">327</span> callable.getScan().withStartRow(this.lastResult.getRow(), this.lastResult.mayHaveMoreCellsInRow());<a name="line.327"></a> -<span class="sourceLineNo">328</span> }<a name="line.328"></a> -<span class="sourceLineNo">329</span><a name="line.329"></a> -<span class="sourceLineNo">330</span> @VisibleForTesting<a name="line.330"></a> -<span class="sourceLineNo">331</span> boolean isAnyRPCcancelled() {<a name="line.331"></a> -<span class="sourceLineNo">332</span> return someRPCcancelled;<a name="line.332"></a> -<span class="sourceLineNo">333</span> }<a name="line.333"></a> -<span class="sourceLineNo">334</span><a name="line.334"></a> -<span class="sourceLineNo">335</span> class RetryingRPC implements RetryingCallable<Pair<Result[], ScannerCallable>>, Cancellable {<a name="line.335"></a> -<span 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(caller.callWithRetries is synchronized<a name="line.345"></a> -<span class="sourceLineNo">346</span> // and we can't invoke it multiple times at the same time)<a name="line.346"></a> -<span class="sourceLineNo">347</span> this.caller = ScannerCallableWithReplicas.this.caller;<a name="line.347"></a> -<span class="sourceLineNo">348</span> if (scan.getConsistency() == Consistency.TIMELINE) {<a name="line.348"></a> -<span class="sourceLineNo">349</span> this.caller = RpcRetryingCallerFactory.instantiate(ScannerCallableWithReplicas.this.conf)<a name="line.349"></a> -<span class="sourceLineNo">350</span> .<Result[]>newCaller();<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> @Override<a name="line.354"></a> -<span class="sourceLineNo">355</span> public Pair<Result[], ScannerCallable> call(int callTimeout) throws IOException {<a name="line.355"></a> -<span class="sourceLineNo">356</span> // since the retries is done within the ResultBoundedCompletionService,<a name="line.356"></a> -<span class="sourceLineNo">357</span> // we don't invoke callWithRetries here<a name="line.357"></a> -<span class="sourceLineNo">358</span> if (cancelled) {<a name="line.358"></a> -<span class="sourceLineNo">359</span> return null;<a name="line.359"></a> -<span class="sourceLineNo">360</span> }<a name="line.360"></a> -<span class="sourceLineNo">361</span> Result[] res = this.caller.callWithoutRetries(this.callable, callTimeout);<a name="line.361"></a> -<span class="sourceLineNo">362</span> return new Pair<>(res, this.callable);<a name="line.362"></a> -<span class="sourceLineNo">363</span> }<a name="line.363"></a> -<span class="sourceLineNo">364</span><a name="line.364"></a> -<span class="sourceLineNo">365</span> @Override<a name="line.365"></a> -<span class="sourceLineNo">366</span> 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callable.throwable(t, retrying);<a name="line.378"></a> +<span class="sourceLineNo">312</span> private void addCallsForOtherReplicas(<a name="line.312"></a> +<span class="sourceLineNo">313</span> ResultBoundedCompletionService<Pair<Result[], ScannerCallable>> cs, RegionLocations rl,<a name="line.313"></a> +<span class="sourceLineNo">314</span> int min, int max) {<a name="line.314"></a> +<span class="sourceLineNo">315</span><a name="line.315"></a> +<span class="sourceLineNo">316</span> for (int id = min; id <= max; id++) {<a name="line.316"></a> +<span class="sourceLineNo">317</span> if (currentScannerCallable.id == id) {<a name="line.317"></a> +<span class="sourceLineNo">318</span> continue; //this was already scheduled earlier<a name="line.318"></a> +<span class="sourceLineNo">319</span> }<a name="line.319"></a> +<span class="sourceLineNo">320</span> ScannerCallable s = currentScannerCallable.getScannerCallableForReplica(id);<a name="line.320"></a> +<span 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http://git-wip-us.apache.org/repos/asf/hbase-site/blob/c9d35424/devapidocs/src-html/org/apache/hadoop/hbase/io/MetricsIO.html ---------------------------------------------------------------------- diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/io/MetricsIO.html b/devapidocs/src-html/org/apache/hadoop/hbase/io/MetricsIO.html new file mode 100644 index 0000000..babcb66 --- /dev/null +++ b/devapidocs/src-html/org/apache/hadoop/hbase/io/MetricsIO.html @@ -0,0 +1,133 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd";> +<html lang="en"> +<head> +<title>Source code</title> +<link rel="stylesheet" type="text/css" href="../../../../../../stylesheet.css" title="Style"> +</head> +<body> +<div class="sourceContainer"> +<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><a name="line.18"></a> +<span class="sourceLineNo">019</span>package org.apache.hadoop.hbase.io;<a name="line.19"></a> +<span class="sourceLineNo">020</span><a name="line.20"></a> +<span class="sourceLineNo">021</span>import org.apache.hadoop.hbase.CompatibilitySingletonFactory;<a name="line.21"></a> +<span class="sourceLineNo">022</span>import org.apache.hadoop.hbase.regionserver.MetricsRegionServerSourceFactory;<a name="line.22"></a> +<span class="sourceLineNo">023</span>import com.google.common.annotations.VisibleForTesting;<a name="line.23"></a> +<span class="sourceLineNo">024</span><a name="line.24"></a> +<span class="sourceLineNo">025</span>public class MetricsIO {<a name="line.25"></a> +<span class="sourceLineNo">026</span><a name="line.26"></a> +<span class="sourceLineNo">027</span> private final MetricsIOSource source;<a name="line.27"></a> +<span class="sourceLineNo">028</span> private final MetricsIOWrapper wrapper;<a name="line.28"></a> +<span class="sourceLineNo">029</span><a name="line.29"></a> +<span class="sourceLineNo">030</span> public MetricsIO(MetricsIOWrapper wrapper) {<a name="line.30"></a> +<span class="sourceLineNo">031</span> this(CompatibilitySingletonFactory.getInstance(MetricsRegionServerSourceFactory.class)<a name="line.31"></a> +<span class="sourceLineNo">032</span> .createIO(wrapper), wrapper);<a name="line.32"></a> +<span class="sourceLineNo">033</span> }<a name="line.33"></a> +<span class="sourceLineNo">034</span><a name="line.34"></a> +<span class="sourceLineNo">035</span> MetricsIO(MetricsIOSource source, MetricsIOWrapper wrapper) {<a name="line.35"></a> +<span class="sourceLineNo">036</span> this.source = source;<a name="line.36"></a> +<span class="sourceLineNo">037</span> this.wrapper = wrapper;<a name="line.37"></a> +<span class="sourceLineNo">038</span> }<a name="line.38"></a> +<span class="sourceLineNo">039</span><a name="line.39"></a> +<span class="sourceLineNo">040</span> @VisibleForTesting<a name="line.40"></a> +<span class="sourceLineNo">041</span> public MetricsIOSource getMetricsSource() {<a name="line.41"></a> +<span class="sourceLineNo">042</span> return source;<a name="line.42"></a> +<span class="sourceLineNo">043</span> }<a name="line.43"></a> +<span class="sourceLineNo">044</span><a name="line.44"></a> +<span class="sourceLineNo">045</span> @VisibleForTesting<a name="line.45"></a> +<span class="sourceLineNo">046</span> public MetricsIOWrapper getWrapper() {<a name="line.46"></a> +<span class="sourceLineNo">047</span> return wrapper;<a name="line.47"></a> +<span class="sourceLineNo">048</span> }<a name="line.48"></a> +<span class="sourceLineNo">049</span><a name="line.49"></a> +<span class="sourceLineNo">050</span> public void updateFsReadTime(long t) {<a name="line.50"></a> +<span class="sourceLineNo">051</span> source.updateFsReadTime(t);<a name="line.51"></a> +<span class="sourceLineNo">052</span> }<a name="line.52"></a> +<span class="sourceLineNo">053</span><a name="line.53"></a> +<span class="sourceLineNo">054</span> public void updateFsPreadTime(long t) {<a name="line.54"></a> +<span class="sourceLineNo">055</span> source.updateFsPReadTime(t);<a name="line.55"></a> +<span class="sourceLineNo">056</span> }<a name="line.56"></a> +<span class="sourceLineNo">057</span><a name="line.57"></a> +<span class="sourceLineNo">058</span> public void updateFsWriteTime(long t) {<a name="line.58"></a> +<span class="sourceLineNo">059</span> source.updateFsWriteTime(t);<a name="line.59"></a> +<span class="sourceLineNo">060</span> }<a name="line.60"></a> +<span class="sourceLineNo">061</span>}<a name="line.61"></a> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +</pre> +</div> +</body> +</html>
