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apache / hadoop-site / 952d547359cafef280f0a0324055741b2ed55be1 / . / content / docs / r3.3.1 / hadoop-yarn / hadoop-yarn-server / hadoop-yarn-server-resourcemanager / apidocs / org / apache / hadoop / yarn / server / resourcemanager / ActiveStandbyElectorBasedElectorService.html
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<div class="subTitle">org.apache.hadoop.yarn.server.resourcemanager</div>
<h2 title="Class ActiveStandbyElectorBasedElectorService" class="title">Class ActiveStandbyElectorBasedElectorService</h2>
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<li>org.apache.hadoop.service.AbstractService</li>
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<ul class="inheritance">
<li>org.apache.hadoop.yarn.server.resourcemanager.ActiveStandbyElectorBasedElectorService</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a>, org.apache.hadoop.ha.ActiveStandbyElector.ActiveStandbyElectorCallback, org.apache.hadoop.service.Service, <a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/EmbeddedElector.html" title="interface in org.apache.hadoop.yarn.server.resourcemanager">EmbeddedElector</a></dd>
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<pre>@InterfaceAudience.Private
@InterfaceStability.Unstable
public class <span class="typeNameLabel">ActiveStandbyElectorBasedElectorService</span>
extends org.apache.hadoop.service.AbstractService
implements <a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/EmbeddedElector.html" title="interface in org.apache.hadoop.yarn.server.resourcemanager">EmbeddedElector</a>, org.apache.hadoop.ha.ActiveStandbyElector.ActiveStandbyElectorCallback</pre>
<div class="block">Leader election implementation that uses <code>ActiveStandbyElector</code>.</div>
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<h3>Nested classes/interfaces inherited from interface&nbsp;org.apache.hadoop.service.Service</h3>
<code>org.apache.hadoop.service.Service.STATE</code></li>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/ActiveStandbyElectorBasedElectorService.html#becomeActive--">becomeActive</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/ActiveStandbyElectorBasedElectorService.html#becomeStandby--">becomeStandby</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/ActiveStandbyElectorBasedElectorService.html#enterNeutralMode--">enterNeutralMode</a></span>()</code>
<div class="block">When the ZK client loses contact with ZK, this method will be called to
allow the RM to react.</div>
</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/ActiveStandbyElectorBasedElectorService.html#fenceOldActive-byte:A-">fenceOldActive</a></span>(byte[]&nbsp;oldActiveData)</code>&nbsp;</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/ActiveStandbyElectorBasedElectorService.html#getZookeeperConnectionState--">getZookeeperConnectionState</a></span>()</code>
<div class="block">Get information about the elector's connection to Zookeeper.</div>
</td>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/ActiveStandbyElectorBasedElectorService.html#notifyFatalError-java.lang.String-">notifyFatalError</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;errorMessage)</code>&nbsp;</td>
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<tr id="i6" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/ActiveStandbyElectorBasedElectorService.html#rejoinElection--">rejoinElection</a></span>()</code>
<div class="block">Leave and rejoin leader election.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/ActiveStandbyElectorBasedElectorService.html#serviceInit-org.apache.hadoop.conf.Configuration-">serviceInit</a></span>(org.apache.hadoop.conf.Configuration&nbsp;conf)</code>&nbsp;</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/ActiveStandbyElectorBasedElectorService.html#serviceStart--">serviceStart</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/ActiveStandbyElectorBasedElectorService.html#serviceStop--">serviceStop</a></span>()</code>&nbsp;</td>
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<h3>Methods inherited from class&nbsp;org.apache.hadoop.service.AbstractService</h3>
<code>close, getBlockers, getConfig, getFailureCause, getFailureState, getLifecycleHistory, getName, getServiceState, getStartTime, init, isInState, noteFailure, putBlocker, registerGlobalListener, registerServiceListener, removeBlocker, setConfig, start, stop, toString, unregisterGlobalListener, unregisterServiceListener, waitForServiceToStop</code></li>
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<h3>Methods inherited from interface&nbsp;org.apache.hadoop.service.Service</h3>
<code>close, getBlockers, getConfig, getFailureCause, getFailureState, getLifecycleHistory, getName, getServiceState, getStartTime, init, isInState, registerServiceListener, start, stop, unregisterServiceListener, waitForServiceToStop</code></li>
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<h4>serviceInit</h4>
<pre>protected&nbsp;void&nbsp;serviceInit(org.apache.hadoop.conf.Configuration&nbsp;conf)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
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<dd><code>serviceInit</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.service.AbstractService</code></dd>
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<pre>protected&nbsp;void&nbsp;serviceStart()
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
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<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code>serviceStart</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.service.AbstractService</code></dd>
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<pre>protected&nbsp;void&nbsp;serviceStop()
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
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<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code>serviceStop</code>&nbsp;in class&nbsp;<code>org.apache.hadoop.service.AbstractService</code></dd>
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<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code></dd>
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<h4>becomeActive</h4>
<pre>public&nbsp;void&nbsp;becomeActive()
throws org.apache.hadoop.ha.ServiceFailedException</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>becomeActive</code>&nbsp;in interface&nbsp;<code>org.apache.hadoop.ha.ActiveStandbyElector.ActiveStandbyElectorCallback</code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>org.apache.hadoop.ha.ServiceFailedException</code></dd>
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<h4>becomeStandby</h4>
<pre>public&nbsp;void&nbsp;becomeStandby()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>becomeStandby</code>&nbsp;in interface&nbsp;<code>org.apache.hadoop.ha.ActiveStandbyElector.ActiveStandbyElectorCallback</code></dd>
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<h4>enterNeutralMode</h4>
<pre>public&nbsp;void&nbsp;enterNeutralMode()</pre>
<div class="block">When the ZK client loses contact with ZK, this method will be called to
allow the RM to react. Because the loss of connection can be noticed
before the session timeout happens, it is undesirable to transition
immediately. Instead the method starts a timer that will wait
<code>YarnConfiguration.RM_ZK_TIMEOUT_MS</code> milliseconds before
initiating the transition into standby state.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>enterNeutralMode</code>&nbsp;in interface&nbsp;<code>org.apache.hadoop.ha.ActiveStandbyElector.ActiveStandbyElectorCallback</code></dd>
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<h4>notifyFatalError</h4>
<pre>public&nbsp;void&nbsp;notifyFatalError(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;errorMessage)</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>notifyFatalError</code>&nbsp;in interface&nbsp;<code>org.apache.hadoop.ha.ActiveStandbyElector.ActiveStandbyElectorCallback</code></dd>
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<pre>public&nbsp;void&nbsp;fenceOldActive(byte[]&nbsp;oldActiveData)</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>fenceOldActive</code>&nbsp;in interface&nbsp;<code>org.apache.hadoop.ha.ActiveStandbyElector.ActiveStandbyElectorCallback</code></dd>
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<h4>rejoinElection</h4>
<pre>public&nbsp;void&nbsp;rejoinElection()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/EmbeddedElector.html#rejoinElection--">EmbeddedElector</a></code></span></div>
<div class="block">Leave and rejoin leader election.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/EmbeddedElector.html#rejoinElection--">rejoinElection</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/EmbeddedElector.html" title="interface in org.apache.hadoop.yarn.server.resourcemanager">EmbeddedElector</a></code></dd>
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<h4>getZookeeperConnectionState</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;getZookeeperConnectionState()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/EmbeddedElector.html#getZookeeperConnectionState--">EmbeddedElector</a></code></span></div>
<div class="block">Get information about the elector's connection to Zookeeper.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/EmbeddedElector.html#getZookeeperConnectionState--">getZookeeperConnectionState</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/hadoop/yarn/server/resourcemanager/EmbeddedElector.html" title="interface in org.apache.hadoop.yarn.server.resourcemanager">EmbeddedElector</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>zookeeper connection state</dd>
</dl>
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