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(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">075</span> private int regionReplication = 0;<a name="line.75"></a> +<span class="sourceLineNo">076</span><a name="line.76"></a> +<span class="sourceLineNo">077</span> public ScannerCallableWithReplicas(TableName tableName, ClusterConnection cConnection,<a name="line.77"></a> +<span class="sourceLineNo">078</span> ScannerCallable baseCallable, ExecutorService pool, int timeBeforeReplicas, Scan scan,<a name="line.78"></a> +<span class="sourceLineNo">079</span> int retries, int scannerTimeout, int caching, Configuration conf,<a name="line.79"></a> +<span class="sourceLineNo">080</span> RpcRetryingCaller<Result []> caller) {<a name="line.80"></a> +<span class="sourceLineNo">081</span> this.currentScannerCallable = baseCallable;<a name="line.81"></a> +<span class="sourceLineNo">082</span> this.cConnection = cConnection;<a name="line.82"></a> +<span class="sourceLineNo">083</span> this.pool = pool;<a name="line.83"></a> +<span class="sourceLineNo">084</span> if (timeBeforeReplicas < 0) {<a name="line.84"></a> +<span class="sourceLineNo">085</span> throw new IllegalArgumentException("Invalid value of operation timeout on the primary");<a name="line.85"></a> +<span class="sourceLineNo">086</span> }<a name="line.86"></a> +<span class="sourceLineNo">087</span> this.timeBeforeReplicas = timeBeforeReplicas;<a name="line.87"></a> +<span class="sourceLineNo">088</span> this.scan = scan;<a name="line.88"></a> +<span class="sourceLineNo">089</span> this.retries = retries;<a name="line.89"></a> +<span class="sourceLineNo">090</span> this.tableName = tableName;<a name="line.90"></a> +<span class="sourceLineNo">091</span> this.conf = conf;<a name="line.91"></a> +<span class="sourceLineNo">092</span> this.scannerTimeout = scannerTimeout;<a name="line.92"></a> +<span class="sourceLineNo">093</span> this.caller = caller;<a name="line.93"></a> +<span class="sourceLineNo">094</span> }<a name="line.94"></a> +<span class="sourceLineNo">095</span><a name="line.95"></a> +<span class="sourceLineNo">096</span> public void setClose() {<a name="line.96"></a> +<span class="sourceLineNo">097</span> currentScannerCallable.setClose();<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> public void setRenew(boolean val) {<a name="line.100"></a> +<span class="sourceLineNo">101</span> currentScannerCallable.setRenew(val);<a name="line.101"></a> +<span class="sourceLineNo">102</span> }<a name="line.102"></a> +<span class="sourceLineNo">103</span><a name="line.103"></a> +<span class="sourceLineNo">104</span> public void setCaching(int caching) {<a name="line.104"></a> +<span class="sourceLineNo">105</span> currentScannerCallable.setCaching(caching);<a name="line.105"></a> +<span class="sourceLineNo">106</span> }<a name="line.106"></a> +<span class="sourceLineNo">107</span><a name="line.107"></a> +<span class="sourceLineNo">108</span> public int getCaching() {<a name="line.108"></a> +<span class="sourceLineNo">109</span> return currentScannerCallable.getCaching();<a name="line.109"></a> +<span class="sourceLineNo">110</span> }<a name="line.110"></a> +<span class="sourceLineNo">111</span><a name="line.111"></a> +<span class="sourceLineNo">112</span> public HRegionInfo getHRegionInfo() {<a name="line.112"></a> +<span class="sourceLineNo">113</span> return currentScannerCallable.getHRegionInfo();<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> public MoreResults moreResultsInRegion() {<a name="line.116"></a> +<span class="sourceLineNo">117</span> return currentScannerCallable.moreResultsInRegion();<a name="line.117"></a> +<span class="sourceLineNo">118</span> }<a name="line.118"></a> +<span class="sourceLineNo">119</span><a name="line.119"></a> +<span class="sourceLineNo">120</span> public MoreResults moreResultsForScan() {<a name="line.120"></a> +<span class="sourceLineNo">121</span> return currentScannerCallable.moreResultsForScan();<a name="line.121"></a> +<span class="sourceLineNo">122</span> }<a name="line.122"></a> +<span class="sourceLineNo">123</span><a name="line.123"></a> +<span class="sourceLineNo">124</span> @Override<a name="line.124"></a> +<span class="sourceLineNo">125</span> public Result [] call(int timeout) throws IOException {<a name="line.125"></a> +<span class="sourceLineNo">126</span> // If the active replica callable was closed somewhere, invoke the RPC to<a name="line.126"></a> +<span class="sourceLineNo">127</span> // really close it. In the case of regular scanners, this applies. We make couple<a name="line.127"></a> +<span class="sourceLineNo">128</span> // of RPCs to a RegionServer, and when that region is exhausted, we set<a name="line.128"></a> +<span class="sourceLineNo">129</span> // the closed flag. Then an RPC is required to actually close the scanner.<a name="line.129"></a> +<span class="sourceLineNo">130</span> if (currentScannerCallable != null && currentScannerCallable.closed) {<a name="line.130"></a> +<span class="sourceLineNo">131</span> // For closing we target that exact scanner (and not do replica fallback like in<a name="line.131"></a> +<span class="sourceLineNo">132</span> // the case of normal reads)<a name="line.132"></a> +<span class="sourceLineNo">133</span> if (LOG.isTraceEnabled()) {<a name="line.133"></a> +<span class="sourceLineNo">134</span> LOG.trace("Closing scanner id=" + currentScannerCallable.scannerId);<a name="line.134"></a> +<span class="sourceLineNo">135</span> }<a name="line.135"></a> +<span class="sourceLineNo">136</span> Result[] r = currentScannerCallable.call(timeout);<a name="line.136"></a> +<span class="sourceLineNo">137</span> currentScannerCallable = null;<a name="line.137"></a> +<span class="sourceLineNo">138</span> return r;<a name="line.138"></a> +<span class="sourceLineNo">139</span> }<a name="line.139"></a> +<span class="sourceLineNo">140</span> // We need to do the following:<a name="line.140"></a> +<span class="sourceLineNo">141</span> //1. When a scan goes out to a certain replica (default or not), we need to<a name="line.141"></a> +<span class="sourceLineNo">142</span> // continue to hit that until there is a failure. So store the last successfully invoked<a name="line.142"></a> +<span class="sourceLineNo">143</span> // replica<a name="line.143"></a> +<span class="sourceLineNo">144</span> //2. We should close the "losing" scanners (scanners other than the ones we hear back<a name="line.144"></a> +<span class="sourceLineNo">145</span> // from first)<a name="line.145"></a> +<span class="sourceLineNo">146</span> //<a name="line.146"></a> +<span class="sourceLineNo">147</span> // Since RegionReplication is a table attribute, it wont change as long as table is enabled,<a name="line.147"></a> +<span class="sourceLineNo">148</span> // it just needs to be set once.<a name="line.148"></a> +<span class="sourceLineNo">149</span><a name="line.149"></a> +<span class="sourceLineNo">150</span> if (regionReplication <= 0) {<a name="line.150"></a> +<span class="sourceLineNo">151</span> RegionLocations rl = null;<a name="line.151"></a> +<span class="sourceLineNo">152</span> try {<a name="line.152"></a> +<span class="sourceLineNo">153</span> rl = RpcRetryingCallerWithReadReplicas.getRegionLocations(true,<a name="line.153"></a> +<span class="sourceLineNo">154</span> RegionReplicaUtil.DEFAULT_REPLICA_ID, cConnection, tableName,<a name="line.154"></a> +<span class="sourceLineNo">155</span> currentScannerCallable.getRow());<a name="line.155"></a> +<span class="sourceLineNo">156</span> } catch (RetriesExhaustedException | DoNotRetryIOException e) {<a name="line.156"></a> +<span class="sourceLineNo">157</span> // We cannot get the primary replica region location, it is possible that the region server<a name="line.157"></a> +<span class="sourceLineNo">158</span> // hosting meta table is down, it needs to proceed to try cached replicas directly.<a name="line.158"></a> +<span class="sourceLineNo">159</span> if (cConnection instanceof ConnectionImplementation) {<a name="line.159"></a> +<span class="sourceLineNo">160</span> rl = ((ConnectionImplementation) cConnection)<a name="line.160"></a> +<span class="sourceLineNo">161</span> .getCachedLocation(tableName, currentScannerCallable.getRow());<a name="line.161"></a> +<span class="sourceLineNo">162</span> if (rl == null) {<a name="line.162"></a> +<span class="sourceLineNo">163</span> throw e;<a name="line.163"></a> +<span class="sourceLineNo">164</span> }<a name="line.164"></a> +<span class="sourceLineNo">165</span> } else {<a name="line.165"></a> +<span class="sourceLineNo">166</span> // For completeness<a name="line.166"></a> +<span class="sourceLineNo">167</span> throw e;<a name="line.167"></a> +<span class="sourceLineNo">168</span> }<a name="line.168"></a> +<span class="sourceLineNo">169</span> }<a name="line.169"></a> +<span class="sourceLineNo">170</span> regionReplication = rl.size();<a name="line.170"></a> +<span class="sourceLineNo">171</span> }<a name="line.171"></a> +<span class="sourceLineNo">172</span> // allocate a boundedcompletion pool of some multiple of number of replicas.<a name="line.172"></a> +<span class="sourceLineNo">173</span> // We want to accomodate some RPCs for redundant replica scans (but are still in progress)<a name="line.173"></a> +<span class="sourceLineNo">174</span> ResultBoundedCompletionService<Pair<Result[], ScannerCallable>> cs =<a name="line.174"></a> +<span class="sourceLineNo">175</span> new ResultBoundedCompletionService<>(<a name="line.175"></a> +<span class="sourceLineNo">176</span> RpcRetryingCallerFactory.instantiate(ScannerCallableWithReplicas.this.conf), pool,<a name="line.176"></a> +<span class="sourceLineNo">177</span> regionReplication * 5);<a name="line.177"></a> +<span class="sourceLineNo">178</span><a name="line.178"></a> +<span class="sourceLineNo">179</span> AtomicBoolean done = new AtomicBoolean(false);<a name="line.179"></a> +<span class="sourceLineNo">180</span> replicaSwitched.set(false);<a name="line.180"></a> +<span class="sourceLineNo">181</span> // submit call for the primary replica.<a name="line.181"></a> +<span class="sourceLineNo">182</span> addCallsForCurrentReplica(cs);<a name="line.182"></a> +<span class="sourceLineNo">183</span> int startIndex = 0;<a name="line.183"></a> +<span class="sourceLineNo">184</span><a name="line.184"></a> +<span class="sourceLineNo">185</span> try {<a name="line.185"></a> +<span class="sourceLineNo">186</span> // wait for the timeout to see whether the primary responds back<a name="line.186"></a> +<span class="sourceLineNo">187</span> Future<Pair<Result[], ScannerCallable>> f = cs.poll(timeBeforeReplicas,<a name="line.187"></a> +<span class="sourceLineNo">188</span> TimeUnit.MICROSECONDS); // Yes, microseconds<a name="line.188"></a> +<span class="sourceLineNo">189</span> if (f != null) {<a name="line.189"></a> +<span class="sourceLineNo">190</span> // After poll, if f is not null, there must be a completed task<a name="line.190"></a> +<span class="sourceLineNo">191</span> Pair<Result[], ScannerCallable> r = f.get();<a name="line.191"></a> +<span class="sourceLineNo">192</span> if (r != null && r.getSecond() != null) {<a name="line.192"></a> +<span class="sourceLineNo">193</span> updateCurrentlyServingReplica(r.getSecond(), r.getFirst(), done, pool);<a name="line.193"></a> +<span class="sourceLineNo">194</span> }<a name="line.194"></a> +<span class="sourceLineNo">195</span> return r == null ? null : r.getFirst(); //great we got a response<a name="line.195"></a> +<span class="sourceLineNo">196</span> }<a name="line.196"></a> +<span class="sourceLineNo">197</span> } catch (ExecutionException e) {<a name="line.197"></a> +<span class="sourceLineNo">198</span> // We ignore the ExecutionException and continue with the replicas<a name="line.198"></a> +<span class="sourceLineNo">199</span> if (LOG.isDebugEnabled()) {<a name="line.199"></a> +<span class="sourceLineNo">200</span> LOG.debug("Scan with primary region returns " + e.getCause());<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">203</span> // If rl's size is 1 or scan's consitency is strong, it needs to throw<a name="line.203"></a> +<span class="sourceLineNo">204</span> // out the exception from the primary replica<a name="line.204"></a> +<span class="sourceLineNo">205</span> if ((regionReplication == 1) || (scan.getConsistency() == Consistency.STRONG)) {<a name="line.205"></a> +<span class="sourceLineNo">206</span> // Rethrow the first exception<a name="line.206"></a> +<span class="sourceLineNo">207</span> RpcRetryingCallerWithReadReplicas.throwEnrichedException(e, retries);<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> public Cursor getCursor() {<a name="line.305"></a> -<span class="sourceLineNo">306</span> return currentScannerCallable != null ? currentScannerCallable.getCursor() : null;<a name="line.306"></a> -<span class="sourceLineNo">307</span> }<a name="line.307"></a> -<span class="sourceLineNo">308</span><a name="line.308"></a> -<span class="sourceLineNo">309</span> private void addCallsForCurrentReplica(<a name="line.309"></a> -<span class="sourceLineNo">310</span> ResultBoundedCompletionService<Pair<Result[], ScannerCallable>> cs, RegionLocations rl) {<a name="line.310"></a> -<span class="sourceLineNo">311</span> RetryingRPC retryingOnReplica = new RetryingRPC(currentScannerCallable);<a name="line.311"></a> -<span class="sourceLineNo">312</span> outstandingCallables.add(currentScannerCallable);<a name="line.312"></a> -<span class="sourceLineNo">313</span> cs.submit(retryingOnReplica, scannerTimeout, currentScannerCallable.id);<a name="line.313"></a> +<span class="sourceLineNo">210</span> startIndex = 1;<a name="line.210"></a> +<span class="sourceLineNo">211</span> } catch (CancellationException e) {<a name="line.211"></a> +<span class="sourceLineNo">212</span> throw new InterruptedIOException(e.getMessage());<a name="line.212"></a> +<span class="sourceLineNo">213</span> } catch (InterruptedException e) {<a name="line.213"></a> +<span class="sourceLineNo">214</span> throw new InterruptedIOException(e.getMessage());<a name="line.214"></a> +<span class="sourceLineNo">215</span> }<a name="line.215"></a> +<span class="sourceLineNo">216</span><a name="line.216"></a> +<span class="sourceLineNo">217</span> // submit call for the all of the secondaries at once<a name="line.217"></a> +<span class="sourceLineNo">218</span> int endIndex = regionReplication;<a name="line.218"></a> +<span class="sourceLineNo">219</span> if (scan.getConsistency() == Consistency.STRONG) {<a name="line.219"></a> +<span class="sourceLineNo">220</span> // When scan's consistency is strong, do not send to the secondaries<a name="line.220"></a> +<span class="sourceLineNo">221</span> endIndex = 1;<a name="line.221"></a> +<span class="sourceLineNo">222</span> } else {<a name="line.222"></a> +<span class="sourceLineNo">223</span> // TODO: this may be an overkill for large region replication<a name="line.223"></a> +<span class="sourceLineNo">224</span> addCallsForOtherReplicas(cs, 0, regionReplication - 1);<a name="line.224"></a> +<span class="sourceLineNo">225</span> }<a name="line.225"></a> +<span class="sourceLineNo">226</span><a name="line.226"></a> +<span class="sourceLineNo">227</span> try {<a name="line.227"></a> +<span class="sourceLineNo">228</span> Future<Pair<Result[], ScannerCallable>> f = cs.pollForFirstSuccessfullyCompletedTask(timeout,<a name="line.228"></a> +<span class="sourceLineNo">229</span> TimeUnit.MILLISECONDS, startIndex, endIndex);<a name="line.229"></a> +<span class="sourceLineNo">230</span><a name="line.230"></a> +<span class="sourceLineNo">231</span> if (f == null) {<a name="line.231"></a> +<span class="sourceLineNo">232</span> throw new IOException("Failed to get result within timeout, timeout=" + timeout + "ms");<a name="line.232"></a> +<span class="sourceLineNo">233</span> }<a name="line.233"></a> +<span class="sourceLineNo">234</span> Pair<Result[], ScannerCallable> r = f.get();<a name="line.234"></a> +<span class="sourceLineNo">235</span><a name="line.235"></a> +<span class="sourceLineNo">236</span> if (r != null && r.getSecond() != null) {<a name="line.236"></a> +<span class="sourceLineNo">237</span> updateCurrentlyServingReplica(r.getSecond(), r.getFirst(), done, pool);<a name="line.237"></a> +<span class="sourceLineNo">238</span> }<a name="line.238"></a> +<span class="sourceLineNo">239</span> return r == null ? null : r.getFirst(); // great we got an answer<a name="line.239"></a> +<span class="sourceLineNo">240</span><a name="line.240"></a> +<span class="sourceLineNo">241</span> } catch (ExecutionException e) {<a name="line.241"></a> +<span class="sourceLineNo">242</span> RpcRetryingCallerWithReadReplicas.throwEnrichedException(e, retries);<a name="line.242"></a> +<span class="sourceLineNo">243</span> } catch (CancellationException e) {<a name="line.243"></a> +<span class="sourceLineNo">244</span> throw new InterruptedIOException(e.getMessage());<a name="line.244"></a> +<span class="sourceLineNo">245</span> } catch (InterruptedException e) {<a name="line.245"></a> +<span class="sourceLineNo">246</span> throw new InterruptedIOException(e.getMessage());<a name="line.246"></a> +<span class="sourceLineNo">247</span> } finally {<a name="line.247"></a> +<span class="sourceLineNo">248</span> // We get there because we were interrupted or because one or more of the<a name="line.248"></a> +<span class="sourceLineNo">249</span> // calls succeeded or failed. In all case, we stop all our tasks.<a name="line.249"></a> +<span class="sourceLineNo">250</span> cs.cancelAll();<a name="line.250"></a> +<span class="sourceLineNo">251</span> }<a name="line.251"></a> +<span class="sourceLineNo">252</span> LOG.error("Imposible? Arrive at an unreachable line..."); // unreachable<a name="line.252"></a> +<span class="sourceLineNo">253</span> throw new IOException("Imposible? Arrive at an unreachable line...");<a name="line.253"></a> +<span class="sourceLineNo">254</span> }<a name="line.254"></a> +<span class="sourceLineNo">255</span><a name="line.255"></a> +<span class="sourceLineNo">256</span> private void updateCurrentlyServingReplica(ScannerCallable scanner, Result[] result,<a name="line.256"></a> +<span class="sourceLineNo">257</span> AtomicBoolean done, ExecutorService pool) {<a name="line.257"></a> +<span class="sourceLineNo">258</span> if (done.compareAndSet(false, true)) {<a name="line.258"></a> +<span class="sourceLineNo">259</span> if (currentScannerCallable != scanner) replicaSwitched.set(true);<a name="line.259"></a> +<span class="sourceLineNo">260</span> currentScannerCallable = scanner;<a name="line.260"></a> +<span class="sourceLineNo">261</span> // store where to start the replica scanner from if we need to.<a name="line.261"></a> +<span class="sourceLineNo">262</span> if (result != null && result.length != 0) this.lastResult = result[result.length - 1];<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("Setting current scanner as id=" + currentScannerCallable.scannerId +<a name="line.264"></a> +<span class="sourceLineNo">265</span> " associated with replica=" + currentScannerCallable.getHRegionInfo().getReplicaId());<a name="line.265"></a> +<span class="sourceLineNo">266</span> }<a name="line.266"></a> +<span class="sourceLineNo">267</span> // close all outstanding replica scanners but the one we heard back from<a name="line.267"></a> +<span class="sourceLineNo">268</span> outstandingCallables.remove(scanner);<a name="line.268"></a> +<span class="sourceLineNo">269</span> for (ScannerCallable s : outstandingCallables) {<a name="line.269"></a> +<span class="sourceLineNo">270</span> if (LOG.isTraceEnabled()) {<a name="line.270"></a> +<span class="sourceLineNo">271</span> LOG.trace("Closing scanner id=" + s.scannerId +<a name="line.271"></a> +<span class="sourceLineNo">272</span> ", replica=" + s.getHRegionInfo().getRegionId() +<a name="line.272"></a> +<span class="sourceLineNo">273</span> " because slow and replica=" +<a name="line.273"></a> +<span class="sourceLineNo">274</span> this.currentScannerCallable.getHRegionInfo().getReplicaId() + " succeeded");<a name="line.274"></a> +<span class="sourceLineNo">275</span> }<a name="line.275"></a> +<span class="sourceLineNo">276</span> // Submit the "close" to the pool since this might take time, and we don't<a name="line.276"></a> +<span class="sourceLineNo">277</span> // want to wait for the "close" to happen yet. The "wait" will happen when<a name="line.277"></a> +<span class="sourceLineNo">278</span> // the table is closed (when the awaitTermination of the underlying pool is called)<a name="line.278"></a> +<span class="sourceLineNo">279</span> s.setClose();<a name="line.279"></a> +<span class="sourceLineNo">280</span> final RetryingRPC r = new RetryingRPC(s);<a name="line.280"></a> +<span class="sourceLineNo">281</span> pool.submit(new Callable<Void>(){<a name="line.281"></a> +<span class="sourceLineNo">282</span> @Override<a name="line.282"></a> +<span class="sourceLineNo">283</span> public Void call() throws Exception {<a name="line.283"></a> +<span class="sourceLineNo">284</span> r.call(scannerTimeout);<a name="line.284"></a> +<span class="sourceLineNo">285</span> return null;<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> // now clear outstandingCallables since we scheduled a close for all the contained scanners<a name="line.289"></a> +<span class="sourceLineNo">290</span> outstandingCallables.clear();<a name="line.290"></a> +<span class="sourceLineNo">291</span> }<a name="line.291"></a> +<span class="sourceLineNo">292</span> }<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> * When a scanner switches in the middle of scanning (the 'next' call fails<a name="line.295"></a> +<span class="sourceLineNo">296</span> * for example), the upper layer {@link ClientScanner} needs to know<a name="line.296"></a> +<span class="sourceLineNo">297</span> */<a name="line.297"></a> +<span class="sourceLineNo">298</span> public boolean switchedToADifferentReplica() {<a name="line.298"></a> +<span class="sourceLineNo">299</span> return replicaSwitched.get();<a name="line.299"></a> +<span class="sourceLineNo">300</span> }<a name="line.300"></a> +<span class="sourceLineNo">301</span><a name="line.301"></a> +<span class="sourceLineNo">302</span> /**<a name="line.302"></a> +<span class="sourceLineNo">303</span> * @return true when the most recent RPC response indicated that the response was a heartbeat<a name="line.303"></a> +<span class="sourceLineNo">304</span> * message. Heartbeat messages are sent back from the server when the processing of the<a name="line.304"></a> +<span class="sourceLineNo">305</span> * scan request exceeds a certain time threshold. Heartbeats allow the server to avoid<a name="line.305"></a> +<span class="sourceLineNo">306</span> * timeouts during long running scan operations.<a name="line.306"></a> +<span class="sourceLineNo">307</span> */<a name="line.307"></a> +<span class="sourceLineNo">308</span> public boolean isHeartbeatMessage() {<a name="line.308"></a> +<span class="sourceLineNo">309</span> return currentScannerCallable != null && currentScannerCallable.isHeartbeatMessage();<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> public Cursor getCursor() {<a name="line.312"></a> +<span class="sourceLineNo">313</span> return currentScannerCallable != null ? currentScannerCallable.getCursor() : null;<a name="line.313"></a> <span class="sourceLineNo">314</span> }<a name="line.314"></a> <span class="sourceLineNo">315</span><a name="line.315"></a> -<span class="sourceLineNo">316</span> private void addCallsForOtherReplicas(<a name="line.316"></a> -<span class="sourceLineNo">317</span> ResultBoundedCompletionService<Pair<Result[], ScannerCallable>> cs, RegionLocations rl,<a name="line.317"></a> -<span class="sourceLineNo">318</span> int min, int max) {<a name="line.318"></a> -<span class="sourceLineNo">319</span><a name="line.319"></a> -<span class="sourceLineNo">320</span> for (int id = min; id <= max; id++) {<a name="line.320"></a> -<span class="sourceLineNo">321</span> if (currentScannerCallable.id == id) {<a name="line.321"></a> -<span class="sourceLineNo">322</span> continue; //this was already scheduled earlier<a name="line.322"></a> -<span class="sourceLineNo">323</span> }<a name="line.323"></a> -<span class="sourceLineNo">324</span> ScannerCallable s = currentScannerCallable.getScannerCallableForReplica(id);<a name="line.324"></a> -<span class="sourceLineNo">325</span> setStartRowForReplicaCallable(s);<a name="line.325"></a> -<span class="sourceLineNo">326</span> outstandingCallables.add(s);<a name="line.326"></a> -<span class="sourceLineNo">327</span> RetryingRPC retryingOnReplica = new RetryingRPC(s);<a name="line.327"></a> -<span class="sourceLineNo">328</span> cs.submit(retryingOnReplica, scannerTimeout, id);<a name="line.328"></a> -<span class="sourceLineNo">329</span> }<a name="line.329"></a> -<span class="sourceLineNo">330</span> }<a name="line.330"></a> -<span class="sourceLineNo">331</span><a name="line.331"></a> -<span class="sourceLineNo">332</span> /**<a name="line.332"></a> -<span class="sourceLineNo">333</span> * Set the start row for the replica callable based on the state of the last result received.<a name="line.333"></a> -<span class="sourceLineNo">334</span> * @param callable The callable to set the start row on<a name="line.334"></a> -<span class="sourceLineNo">335</span> */<a name="line.335"></a> -<span class="sourceLineNo">336</span> private void setStartRowForReplicaCallable(ScannerCallable callable) {<a name="line.336"></a> -<span class="sourceLineNo">337</span> if (this.lastResult == null || callable == null) {<a name="line.337"></a> -<span class="sourceLineNo">338</span> return;<a name="line.338"></a> -<span class="sourceLineNo">339</span> }<a name="line.339"></a> -<span class="sourceLineNo">340</span> // 1. The last result was a partial result which means we have not received all of the cells<a name="line.340"></a> -<span class="sourceLineNo">341</span> // for this row. Thus, use the last result's row as the start row. If a replica switch<a name="line.341"></a> -<span class="sourceLineNo">342</span> // occurs, the scanner will ensure that any accumulated partial results are cleared,<a name="line.342"></a> -<span class="sourceLineNo">343</span> // and the scan can resume from this row.<a name="line.343"></a> -<span class="sourceLineNo">344</span> // 2. The last result was not a partial result which means it contained all of the cells for<a name="line.344"></a> -<span class="sourceLineNo">345</span> // that row (we no longer need any information from it). Set the start row to the next<a name="line.345"></a> -<span class="sourceLineNo">346</span> // closest row that could be seen.<a name="line.346"></a> -<span class="sourceLineNo">347</span> callable.getScan().withStartRow(this.lastResult.getRow(), this.lastResult.mayHaveMoreCellsInRow());<a name="line.347"></a> -<span class="sourceLineNo">348</span> }<a name="line.348"></a> -<span class="sourceLineNo">349</span><a name="line.349"></a> -<span class="sourceLineNo">350</span> @VisibleForTesting<a name="line.350"></a> -<span class="sourceLineNo">351</span> boolean isAnyRPCcancelled() {<a name="line.351"></a> -<span class="sourceLineNo">352</span> return someRPCcancelled;<a name="line.352"></a> -<span class="sourceLineNo">353</span> }<a name="line.353"></a> -<span class="sourceLineNo">354</span><a name="line.354"></a> -<span class="sourceLineNo">355</span> class RetryingRPC implements RetryingCallable<Pair<Result[], ScannerCallable>>, Cancellable {<a name="line.355"></a> -<span class="sourceLineNo">356</span> final ScannerCallable callable;<a name="line.356"></a> -<span class="sourceLineNo">357</span> RpcRetryingCaller<Result[]> caller;<a name="line.357"></a> -<span class="sourceLineNo">358</span> private volatile boolean cancelled = false;<a name="line.358"></a> -<span class="sourceLineNo">359</span><a name="line.359"></a> -<span class="sourceLineNo">360</span> RetryingRPC(ScannerCallable callable) {<a name="line.360"></a> -<span class="sourceLineNo">361</span> this.callable = callable;<a name="line.361"></a> -<span class="sourceLineNo">362</span> // For the Consistency.STRONG (default case), we reuse the caller<a name="line.362"></a> -<span class="sourceLineNo">363</span> // to keep compatibility with what is done in the past<a name="line.363"></a> -<span class="sourceLineNo">364</span> // For the Consistency.TIMELINE case, we can't reuse the caller<a name="line.364"></a> -<span class="sourceLineNo">365</span> // since we could be making parallel RPCs 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call(int callTimeout) throws IOException {<a name="line.375"></a> -<span class="sourceLineNo">376</span> // since the retries is done within the ResultBoundedCompletionService,<a name="line.376"></a> -<span class="sourceLineNo">377</span> // we don't invoke callWithRetries here<a name="line.377"></a> -<span class="sourceLineNo">378</span> if (cancelled) {<a name="line.378"></a> -<span class="sourceLineNo">379</span> return null;<a name="line.379"></a> -<span class="sourceLineNo">380</span> }<a name="line.380"></a> -<span class="sourceLineNo">381</span> Result[] res = this.caller.callWithoutRetries(this.callable, callTimeout);<a name="line.381"></a> -<span class="sourceLineNo">382</span> return new Pair<>(res, this.callable);<a name="line.382"></a> -<span class="sourceLineNo">383</span> }<a name="line.383"></a> -<span class="sourceLineNo">384</span><a name="line.384"></a> -<span class="sourceLineNo">385</span> @Override<a name="line.385"></a> -<span class="sourceLineNo">386</span> 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addCallsForOtherReplicas(<a name="line.323"></a> +<span class="sourceLineNo">324</span> ResultBoundedCompletionService<Pair<Result[], ScannerCallable>> cs, int min, int max) {<a name="line.324"></a> +<span class="sourceLineNo">325</span><a name="line.325"></a> +<span class="sourceLineNo">326</span> for (int id = min; id <= max; id++) {<a name="line.326"></a> +<span class="sourceLineNo">327</span> if (currentScannerCallable.id == id) {<a name="line.327"></a> +<span class="sourceLineNo">328</span> continue; //this was already scheduled earlier<a name="line.328"></a> +<span class="sourceLineNo">329</span> }<a name="line.329"></a> +<span class="sourceLineNo">330</span> ScannerCallable s = currentScannerCallable.getScannerCallableForReplica(id);<a name="line.330"></a> +<span class="sourceLineNo">331</span> setStartRowForReplicaCallable(s);<a name="line.331"></a> +<span class="sourceLineNo">332</span> outstandingCallables.add(s);<a name="line.332"></a> +<span class="sourceLineNo">333</span> 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