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From mi...@apache.org
Subject [21/51] [partial] hbase git commit: Published website at 1cbcf1175e6ce497936f12c60fb2e897833ace39 with HBASE-14785 patch
Date Mon, 09 Nov 2015 05:54:50 GMT
http://git-wip-us.apache.org/repos/asf/hbase/blob/a00babbc/devapidocs/org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html
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+<title>PreemptiveFastFailInterceptor (Apache HBase 2.0.0-SNAPSHOT API)</title>
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+<div class="header">
+<div class="subTitle">org.apache.hadoop.hbase.client</div>
+<h2 title="Class PreemptiveFastFailInterceptor" class="title">Class PreemptiveFastFailInterceptor</h2>
+</div>
+<div class="contentContainer">
+<ul class="inheritance">
+<li><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
+<li>
+<ul class="inheritance">
+<li><a href="../../../../../org/apache/hadoop/hbase/client/RetryingCallerInterceptor.html" title="class in org.apache.hadoop.hbase.client">org.apache.hadoop.hbase.client.RetryingCallerInterceptor</a></li>
+<li>
+<ul class="inheritance">
+<li>org.apache.hadoop.hbase.client.PreemptiveFastFailInterceptor</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+<div class="description">
+<ul class="blockList">
+<li class="blockList">
+<hr>
+<br>
+<pre><a href="../../../../../org/apache/hadoop/hbase/classification/InterfaceAudience.Private.html" title="annotation in org.apache.hadoop.hbase.classification">@InterfaceAudience.Private</a>
+ class <a href="../../../../../src-html/org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#line.74">PreemptiveFastFailInterceptor</a>
+extends <a href="../../../../../org/apache/hadoop/hbase/client/RetryingCallerInterceptor.html" title="class in org.apache.hadoop.hbase.client">RetryingCallerInterceptor</a></pre>
+<div class="block">The concrete <a href="../../../../../org/apache/hadoop/hbase/client/RetryingCallerInterceptor.html" title="class in org.apache.hadoop.hbase.client"><code>RetryingCallerInterceptor</code></a> class that implements the preemptive fast fail
+ feature.
+ 
+ The motivation is as follows : 
+ In case where a large number of clients try and talk to a particular region server in hbase, if
+ the region server goes down due to network problems, we might end up in a scenario where
+ the clients would go into a state where they all start to retry.
+ This behavior will set off many of the threads in pretty much the same path and they all would be
+ sleeping giving rise to a state where the client either needs to create more threads to send new
+ requests to other hbase machines or block because the client cannot create anymore threads.
+ 
+ In most cases the clients might prefer to have a bound on the number of threads that are created
+ in order to send requests to hbase. This would mostly result in the client thread starvation.
+ 
+  To circumvent this problem, the approach that is being taken here under is to let 1 of the many
+  threads who are trying to contact the regionserver with connection problems and let the other
+  threads get a <a href="../../../../../org/apache/hadoop/hbase/exceptions/PreemptiveFastFailException.html" title="class in org.apache.hadoop.hbase.exceptions"><code>PreemptiveFastFailException</code></a> so that they can move on and take other
+  requests.
+  
+  This would give the client more flexibility on the kind of action he would want to take in cases
+  where the regionserver is down. He can either discard the requests and send a nack upstream
+  faster or have an application level retry or buffer the requests up so as to send them down to
+  hbase later.</div>
+</li>
+</ul>
+</div>
+<div class="summary">
+<ul class="blockList">
+<li class="blockList">
+<!-- =========== FIELD SUMMARY =========== -->
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+<li class="blockList"><a name="field_summary">
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+</a>
+<h3>Field Summary</h3>
+<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation">
+<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Field and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>protected long</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#failureMapCleanupIntervalMilliSec">failureMapCleanupIntervalMilliSec</a></strong></code>&nbsp;</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>private long</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#fastFailClearingTimeMilliSec">fastFailClearingTimeMilliSec</a></strong></code>&nbsp;</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>protected long</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#fastFailThresholdMilliSec">fastFailThresholdMilliSec</a></strong></code>&nbsp;</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>protected long</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#lastFailureMapCleanupTimeMilliSec">lastFailureMapCleanupTimeMilliSec</a></strong></code>&nbsp;</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>private static org.apache.commons.logging.Log</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#LOG">LOG</a></strong></code>&nbsp;</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>protected <a href="http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ConcurrentMap.html?is-external=true" title="class or interface in java.util.concurrent">ConcurrentMap</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>,<a href="../../../../../org/apache/hadoop/hbase/client/FailureInfo.html" title="class in org.apache.hadoop.hbase.client">FailureInfo</a>&gt;</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#repeatedFailuresMap">repeatedFailuresMap</a></strong></code>&nbsp;</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>private <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/ThreadLocal.html?is-external=true" title="class or interface in java.lang">ThreadLocal</a>&lt;org.apache.commons.lang.mutable.MutableBoolean&gt;</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#threadRetryingInFastFailMode">threadRetryingInFastFailMode</a></strong></code>&nbsp;</td>
+</tr>
+</table>
+</li>
+</ul>
+<!-- ======== CONSTRUCTOR SUMMARY ======== -->
+<ul class="blockList">
+<li class="blockList"><a name="constructor_summary">
+<!--   -->
+</a>
+<h3>Constructor Summary</h3>
+<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation">
+<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
+<tr>
+<th class="colOne" scope="col">Constructor and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colOne"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#PreemptiveFastFailInterceptor(org.apache.hadoop.conf.Configuration)">PreemptiveFastFailInterceptor</a></strong>(org.apache.hadoop.conf.Configuration&nbsp;conf)</code>&nbsp;</td>
+</tr>
+</table>
+</li>
+</ul>
+<!-- ========== METHOD SUMMARY =========== -->
+<ul class="blockList">
+<li class="blockList"><a name="method_summary">
+<!--   -->
+</a>
+<h3>Method Summary</h3>
+<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
+<caption><span>Methods</span><span class="tabEnd">&nbsp;</span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Method and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/client/RetryingCallerInterceptorContext.html" title="class in org.apache.hadoop.hbase.client">RetryingCallerInterceptorContext</a></code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#createEmptyContext()">createEmptyContext</a></strong>()</code>
+<div class="block">This returns the context object for the current call.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>private boolean</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#currentThreadInFastFailMode()">currentThreadInFastFailMode</a></strong>()</code>
+<div class="block">Checks to see if the current thread is already in FastFail mode for *some*
+ server.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#handleFailure(org.apache.hadoop.hbase.client.FastFailInterceptorContext,%20java.lang.Throwable)">handleFailure</a></strong>(<a href="../../../../../org/apache/hadoop/hbase/client/FastFailInterceptorContext.html" title="class in org.apache.hadoop.hbase.client">FastFailInterceptorContext</a>&nbsp;context,
+                          <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a>&nbsp;t)</code>&nbsp;</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#handleFailure(org.apache.hadoop.hbase.client.RetryingCallerInterceptorContext,%20java.lang.Throwable)">handleFailure</a></strong>(<a href="../../../../../org/apache/hadoop/hbase/client/RetryingCallerInterceptorContext.html" title="class in org.apache.hadoop.hbase.client">RetryingCallerInterceptorContext</a>&nbsp;context,
+                          <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a>&nbsp;t)</code>
+<div class="block">Call this function in case we caught a failure during retries.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>private void</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#handleFailureToServer(org.apache.hadoop.hbase.ServerName,%20java.lang.Throwable)">handleFailureToServer</a></strong>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName,
+                                          <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a>&nbsp;t)</code>
+<div class="block">Handles failures encountered when communicating with a server.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#handleThrowable(java.lang.Throwable,%20org.apache.hadoop.hbase.ServerName,%20org.apache.commons.lang.mutable.MutableBoolean)">handleThrowable</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a>&nbsp;t1,
+                              <a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName,
+                              org.apache.commons.lang.mutable.MutableBoolean&nbsp;couldNotCommunicateWithServer)</code>&nbsp;</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>private boolean</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#inFastFailMode(org.apache.hadoop.hbase.ServerName)">inFastFailMode</a></strong>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;server)</code>
+<div class="block">Checks to see if we are in the Fast fail mode for requests to the server.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#intercept(org.apache.hadoop.hbase.client.FastFailInterceptorContext)">intercept</a></strong>(<a href="../../../../../org/apache/hadoop/hbase/client/FastFailInterceptorContext.html" title="class in org.apache.hadoop.hbase.client">FastFailInterceptorContext</a>&nbsp;context)</code>&nbsp;</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#intercept(org.apache.hadoop.hbase.client.RetryingCallerInterceptorContext)">intercept</a></strong>(<a href="../../../../../org/apache/hadoop/hbase/client/RetryingCallerInterceptorContext.html" title="class in org.apache.hadoop.hbase.client">RetryingCallerInterceptorContext</a>&nbsp;context)</code>
+<div class="block">Call this function alongside the actual call done on the callable.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>private boolean</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#isConnectionException(java.lang.Throwable)">isConnectionException</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a>&nbsp;e)</code>
+<div class="block">Check if the exception is something that indicates that we cannot
+ contact/communicate with the server.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>protected boolean</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#isServerInFailureMap(org.apache.hadoop.hbase.ServerName)">isServerInFailureMap</a></strong>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;serverName)</code>&nbsp;</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>protected void</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#occasionallyCleanupFailureInformation()">occasionallyCleanupFailureInformation</a></strong>()</code>
+<div class="block">Occasionally cleans up unused information in repeatedFailuresMap.</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>protected boolean</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#shouldRetryInspiteOfFastFail(org.apache.hadoop.hbase.client.FailureInfo)">shouldRetryInspiteOfFastFail</a></strong>(<a href="../../../../../org/apache/hadoop/hbase/client/FailureInfo.html" title="class in org.apache.hadoop.hbase.client">FailureInfo</a>&nbsp;fInfo)</code>
+<div class="block">Check to see if the client should try to connnect to the server, inspite of
+ knowing that it is in the fast fail mode.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#toString()">toString</a></strong>()</code>&nbsp;</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>private <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#translateException(java.lang.Throwable)">translateException</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a>&nbsp;t)</code>&nbsp;</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#updateFailureInfo(org.apache.hadoop.hbase.client.FastFailInterceptorContext)">updateFailureInfo</a></strong>(<a href="../../../../../org/apache/hadoop/hbase/client/FastFailInterceptorContext.html" title="class in org.apache.hadoop.hbase.client">FastFailInterceptorContext</a>&nbsp;context)</code>&nbsp;</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#updateFailureInfo(org.apache.hadoop.hbase.client.RetryingCallerInterceptorContext)">updateFailureInfo</a></strong>(<a href="../../../../../org/apache/hadoop/hbase/client/RetryingCallerInterceptorContext.html" title="class in org.apache.hadoop.hbase.client">RetryingCallerInterceptorContext</a>&nbsp;context)</code>
+<div class="block">Call this function to update at the end of the retry.</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>private void</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#updateFailureInfoForServer(org.apache.hadoop.hbase.ServerName,%20org.apache.hadoop.hbase.client.FailureInfo,%20boolean,%20boolean,%20boolean)">updateFailureInfoForServer</a></strong>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;server,
+                                                    <a href="../../../../../org/apache/hadoop/hbase/client/FailureInfo.html" title="class in org.apache.hadoop.hbase.client">FailureInfo</a>&nbsp;fInfo,
+                                                    boolean&nbsp;didTry,
+                                                    boolean&nbsp;couldNotCommunicate,
+                                                    boolean&nbsp;retryDespiteFastFailMode)</code>
+<div class="block">This function updates the Failure info for a particular server after the
+ attempt to</div>
+</td>
+</tr>
+</table>
+<ul class="blockList">
+<li class="blockList"><a name="methods_inherited_from_class_java.lang.Object">
+<!--   -->
+</a>
+<h3>Methods inherited from class&nbsp;java.lang.<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
+<code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang
 /Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait(long,%20int)" title="class or interface in java.lang">wait</a></code></li>
+</ul>
+</li>
+</ul>
+</li>
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+<dd><code><a href="../../../../../org/apache/hadoop/hbase/exceptions/PreemptiveFastFailException.html" title="class in org.apache.hadoop.hbase.exceptions">PreemptiveFastFailException</a></code></dd></dl>
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+                         <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a>&nbsp;t)</pre>
+<div class="block">Handles failures encountered when communicating with a server.
+
+ Updates the FailureInfo in repeatedFailuresMap to reflect the failure.
+ Throws RepeatedConnectException if the client is in Fast fail mode.</div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>serverName</code> - </dd><dd><code>t</code> - - the throwable to be handled.</dd>
+<dt><span class="strong">Throws:</span></dt>
+<dd><code><a href="../../../../../org/apache/hadoop/hbase/exceptions/PreemptiveFastFailException.html" title="class in org.apache.hadoop.hbase.exceptions">PreemptiveFastFailException</a></code></dd></dl>
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+<dl><dt><span class="strong">Throws:</span></dt>
+<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd></dl>
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+<dl><dt><span class="strong">Throws:</span></dt>
+<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd></dl>
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+<div class="block">Check if the exception is something that indicates that we cannot
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+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>e</code> - </dd>
+<dt><span class="strong">Returns:</span></dt><dd>true when exception indicates that the client wasn't able to make contact with server</dd></dl>
+</li>
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+<div class="block">Occasionally cleans up unused information in repeatedFailuresMap.
+
+ repeatedFailuresMap stores the failure information for all remote hosts
+ that had failures. In order to avoid these from growing indefinitely,
+ occassionallyCleanupFailureInformation() will clear these up once every
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+</li>
+</ul>
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+<div class="block">Checks to see if we are in the Fast fail mode for requests to the server.
+
+ If a client is unable to contact a server for more than
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+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>server</code> - </dd>
+<dt><span class="strong">Returns:</span></dt><dd>true if the client is in fast fail mode for the server.</dd></dl>
+</li>
+</ul>
+<a name="currentThreadInFastFailMode()">
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+ server.</div>
+<dl><dt><span class="strong">Returns:</span></dt><dd>true, if the thread is already in FF mode.</dd></dl>
+</li>
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+<div class="block">Check to see if the client should try to connnect to the server, inspite of
+ knowing that it is in the fast fail mode.
+
+ The idea here is that we want just one client thread to be actively trying
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+ short circuit.</div>
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+<dt><span class="strong">Returns:</span></dt><dd>true if the client should try to connect to the server.</dd></dl>
+</li>
+</ul>
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+                              boolean&nbsp;didTry,
+                              boolean&nbsp;couldNotCommunicate,
+                              boolean&nbsp;retryDespiteFastFailMode)</pre>
+<div class="block">This function updates the Failure info for a particular server after the
+ attempt to</div>
+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>server</code> - </dd><dd><code>fInfo</code> - </dd><dd><code>couldNotCommunicate</code> - </dd><dd><code>retryDespiteFastFailMode</code> - </dd></dl>
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+</ul>
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+<div class="block"><strong>Description copied from class:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/client/RetryingCallerInterceptor.html#intercept(org.apache.hadoop.hbase.client.RetryingCallerInterceptorContext)">RetryingCallerInterceptor</a></code></strong></div>
+<div class="block">Call this function alongside the actual call done on the callable.</div>
+<dl>
+<dt><strong>Specified by:</strong></dt>
+<dd><code><a href="../../../../../org/apache/hadoop/hbase/client/RetryingCallerInterceptor.html#intercept(org.apache.hadoop.hbase.client.RetryingCallerInterceptorContext)">intercept</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/client/RetryingCallerInterceptor.html" title="class in org.apache.hadoop.hbase.client">RetryingCallerInterceptor</a></code></dd>
+<dt><span class="strong">Throws:</span></dt>
+<dd><code>PreemptiveFastFailException</code></dd></dl>
+</li>
+</ul>
+<a name="handleFailure(org.apache.hadoop.hbase.client.RetryingCallerInterceptorContext, java.lang.Throwable)">
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+                   throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
+<div class="block"><strong>Description copied from class:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/client/RetryingCallerInterceptor.html#handleFailure(org.apache.hadoop.hbase.client.RetryingCallerInterceptorContext,%20java.lang.Throwable)">RetryingCallerInterceptor</a></code></strong></div>
+<div class="block">Call this function in case we caught a failure during retries.</div>
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+<dt><strong>Specified by:</strong></dt>
+<dd><code><a href="../../../../../org/apache/hadoop/hbase/client/RetryingCallerInterceptor.html#handleFailure(org.apache.hadoop.hbase.client.RetryingCallerInterceptorContext,%20java.lang.Throwable)">handleFailure</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/client/RetryingCallerInterceptor.html" title="class in org.apache.hadoop.hbase.client">RetryingCallerInterceptor</a></code></dd>
+<dt><span class="strong">Parameters:</span></dt><dd><code>context</code> - : The context object that we obtained previously.</dd><dd><code>t</code> - : The exception that we caught in this particular try</dd>
+<dt><span class="strong">Throws:</span></dt>
+<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd></dl>
+</li>
+</ul>
+<a name="updateFailureInfo(org.apache.hadoop.hbase.client.RetryingCallerInterceptorContext)">
+<!--   -->
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+<pre>public&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/client/PreemptiveFastFailInterceptor.html#line.386">updateFailureInfo</a>(<a href="../../../../../org/apache/hadoop/hbase/client/RetryingCallerInterceptorContext.html" title="class in org.apache.hadoop.hbase.client">RetryingCallerInterceptorContext</a>&nbsp;context)</pre>
+<div class="block"><strong>Description copied from class:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/client/RetryingCallerInterceptor.html#updateFailureInfo(org.apache.hadoop.hbase.client.RetryingCallerInterceptorContext)">RetryingCallerInterceptor</a></code></strong></div>
+<div class="block">Call this function to update at the end of the retry. This is not necessary
+ to happen.</div>
+<dl>
+<dt><strong>Specified by:</strong></dt>
+<dd><code><a href="../../../../../org/apache/hadoop/hbase/client/RetryingCallerInterceptor.html#updateFailureInfo(org.apache.hadoop.hbase.client.RetryingCallerInterceptorContext)">updateFailureInfo</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/client/RetryingCallerInterceptor.html" title="class in org.apache.hadoop.hbase.client">RetryingCallerInterceptor</a></code></dd>
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+<div class="block"><strong>Description copied from class:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/client/RetryingCallerInterceptor.html#createEmptyContext()">RetryingCallerInterceptor</a></code></strong></div>
+<div class="block">This returns the context object for the current call.</div>
+<dl>
+<dt><strong>Specified by:</strong></dt>
+<dd><code><a href="../../../../../org/apache/hadoop/hbase/client/RetryingCallerInterceptor.html#createEmptyContext()">createEmptyContext</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/client/RetryingCallerInterceptor.html" title="class in org.apache.hadoop.hbase.client">RetryingCallerInterceptor</a></code></dd>
+<dt><span class="strong">Returns:</span></dt><dd>context : the context that needs to be used during this call.</dd></dl>
+</li>
+</ul>
+<a name="isServerInFailureMap(org.apache.hadoop.hbase.ServerName)">
+<!--   -->
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+<dl>
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+<dd><code><a href="../../../../../org/apache/hadoop/hbase/client/RetryingCallerInterceptor.html#toString()">toString</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/client/RetryingCallerInterceptor.html" title="class in org.apache.hadoop.hbase.client">RetryingCallerInterceptor</a></code></dd>
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+<dt>All Known Implementing Classes:</dt>
+<dd><a href="../../../../../org/apache/hadoop/hbase/client/ZooKeeperRegistry.html" title="class in org.apache.hadoop.hbase.client">ZooKeeperRegistry</a></dd>
+</dl>
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+interface <a href="../../../../../src-html/org/apache/hadoop/hbase/client/Registry.html#line.31">Registry</a></pre>
+<div class="block">Cluster registry.
+ Implementations hold cluster information such as this cluster's id, location of hbase:meta, etc.
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+<caption><span>Methods</span><span class="tabEnd">&nbsp;</span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Method and Description</th>
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+<tr class="altColor">
+<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/Registry.html#getClusterId()">getClusterId</a></strong>()</code>&nbsp;</td>
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+<td class="colFirst"><code>int</code></td>
+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/Registry.html#getCurrentNrHRS()">getCurrentNrHRS</a></strong>()</code>&nbsp;</td>
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+<td class="colLast"><code><strong><a href="../../../../../org/apache/hadoop/hbase/client/Registry.html#init(org.apache.hadoop.hbase.client.Connection)">init</a></strong>(<a href="../../../../../org/apache/hadoop/hbase/client/Connection.html" title="interface in org.apache.hadoop.hbase.client">Connection</a>&nbsp;connection)</code>&nbsp;</td>
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+<dl><dt><span class="strong">Parameters:</span></dt><dd><code>connection</code> - </dd></dl>
+</li>
+</ul>
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+                                      throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
+<dl><dt><span class="strong">Returns:</span></dt><dd>Meta region location</dd>
+<dt><span class="strong">Throws:</span></dt>
+<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd></dl>
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+<dl><dt><span class="strong">Returns:</span></dt><dd>Cluster id.</dd></dl>
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+<dl><dt><span class="strong">Returns:</span></dt><dd>Count of 'running' regionservers</dd>
+<dt><span class="strong">Throws:</span></dt>
+<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd></dl>
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+<h2 title="Class RegistryFactory" class="title">Class RegistryFactory</h2>
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+<li>
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+final class <a href="../../../../../src-html/org/apache/hadoop/hbase/client/RegistryFactory.html#line.28">RegistryFactory</a>
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+<div class="block">Get instance of configured Registry.</div>
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+<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
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