[30/51] [partial] hbase-site git commit: Published site at 82d554e3783372cc6b05489452c815b57c06f6cd.

[git-site-role]

http://git-wip-us.apache.org/repos/asf/hbase-site/blob/c9d35424/devapidocs/src-html/org/apache/hadoop/hbase/client/ScannerCallableWithReplicas.RetryingRPC.html
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diff --git 
a/devapidocs/src-html/org/apache/hadoop/hbase/client/ScannerCallableWithReplicas.RetryingRPC.html
 
b/devapidocs/src-html/org/apache/hadoop/hbase/client/ScannerCallableWithReplicas.RetryingRPC.html
index 33d2175..f9ef80a 100644
--- 
a/devapidocs/src-html/org/apache/hadoop/hbase/client/ScannerCallableWithReplicas.RetryingRPC.html
+++ 
b/devapidocs/src-html/org/apache/hadoop/hbase/client/ScannerCallableWithReplicas.RetryingRPC.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&lt;Result[]&gt; {<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&lt;Result[]&gt; 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&lt;ScannerCallable&gt; 
outstandingCallables = new HashSet&lt;&gt;();<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&lt;Result []&gt; 
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 &lt; 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 
&amp;&amp; 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&lt;Pair&lt;Result[], ScannerCallable&gt;&gt; cs 
=<a name="line.151"></a>
-<span class="sourceLineNo">152</span>        new 
ResultBoundedCompletionService&lt;&gt;(<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&lt;Pair&lt;Result[], 
ScannerCallable&gt;&gt; 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&lt;Result[], 
ScannerCallable&gt; r = f.get();<a name="line.168"></a>
-<span class="sourceLineNo">169</span>        if (r != null &amp;&amp; 
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&lt;Pair&lt;Result[], 
ScannerCallable&gt;&gt; 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&lt;Result[], 
ScannerCallable&gt; 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 &amp;&amp; 
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 &amp;&amp; 
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&lt;Void&gt;(){<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>
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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>
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-<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>
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-<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>
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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>
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name="line.285"></a>
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&amp;&amp; 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&lt;Pair&lt;Result[], ScannerCallable&gt;&gt; cs, 
RegionLocations rl) {<a name="line.290"></a>
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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>
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ResultBoundedCompletionService&lt;Pair&lt;Result[], ScannerCallable&gt;&gt; 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 &lt;= 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&lt;Result[]&gt; {<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&lt;Result[]&gt; 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&lt;ScannerCallable&gt; 
outstandingCallables = new HashSet&lt;&gt;();<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&lt;Result []&gt; 
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 &lt; 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 
&amp;&amp; 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&lt;Pair&lt;Result[], ScannerCallable&gt;&gt; cs 
=<a name="line.167"></a>
+<span class="sourceLineNo">168</span>        new 
ResultBoundedCompletionService&lt;&gt;(<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&lt;Pair&lt;Result[], 
ScannerCallable&gt;&gt; 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&lt;Result[], 
ScannerCallable&gt; r = f.get();<a name="line.184"></a>
+<span class="sourceLineNo">185</span>        if (r != null &amp;&amp; 
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 : 
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currentScannerCallable.getHRegionInfo().getReplicaId());<a name="line.258"></a>
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outstandingCallables.remove(scanner);<a name="line.261"></a>
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this.currentScannerCallable.getHRegionInfo().getReplicaId() + " succeeded");<a 
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to happen yet. The "wait" will happen when<a name="line.270"></a>
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awaitTermination of the underlying pool is called)<a name="line.271"></a>
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middle of scanning (the 'next' call fails<a name="line.288"></a>
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RegionLocations rl) {<a name="line.306"></a>
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outstandingCallables.add(currentScannerCallable);<a name="line.308"></a>
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callable.getScan().withStartRow(this.lastResult.getRow(), 
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ResultBoundedCompletionService&lt;Pair&lt;Result[], ScannerCallable&gt;&gt; cs, 
RegionLocations rl,<a name="line.313"></a>
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id) {<a name="line.317"></a>
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currentScannerCallable.getScannerCallableForReplica(id);<a name="line.320"></a>
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scannerTimeout, id);<a name="line.324"></a>
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callable based on the state of the last result received.<a name="line.329"></a>
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the start row on<a name="line.330"></a>
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callable == null) {<a name="line.333"></a>
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result which means we have not received all of the cells<a name="line.336"></a>
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result's row as the start row. If a replica switch<a name="line.337"></a>
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