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<div class="subTitle">org.apache.hadoop.hbase.master</div>
<h2 title="Class ActiveMasterManager" class="title">Class ActiveMasterManager</h2>
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<ul class="inheritance">
<li><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html" title="class in org.apache.hadoop.hbase.zookeeper">org.apache.hadoop.hbase.zookeeper.ZKListener</a></li>
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<ul class="inheritance">
<li>org.apache.hadoop.hbase.master.ActiveMasterManager</li>
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<pre>@InterfaceAudience.Private
public class <a href="../../../../../src-html/org/apache/hadoop/hbase/master/ActiveMasterManager.html#line.60">ActiveMasterManager</a>
extends <a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html" title="class in org.apache.hadoop.hbase.zookeeper">ZKListener</a></pre>
<div class="block">Handles everything on master-side related to master election. Keeps track of currently active
master and registered backup masters.
<p>
Listens and responds to ZooKeeper notifications on the master znodes, both
<code>nodeCreated</code> and <code>nodeDeleted</code>.
<p>
Contains blocking methods which will hold up backup masters, waiting for the active master to
fail.
<p>
This class is instantiated in the HMaster constructor and the method
#blockUntilBecomingActiveMaster() is called to wait until becoming the active master of the
cluster.</div>
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<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>
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<td class="colFirst"><code>(package private) <a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ActiveMasterManager.html#activeMasterServerName">activeMasterServerName</a></span></code>&nbsp;</td>
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<tr class="rowColor">
<td class="colFirst"><code>private org.apache.hbase.thirdparty.com.google.common.collect.ImmutableList&lt;<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ActiveMasterManager.html#backupMasters">backupMasters</a></span></code>&nbsp;</td>
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<tr class="altColor">
<td class="colFirst"><code>(package private) <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicBoolean.html?is-external=true" title="class or interface in java.util.concurrent.atomic">AtomicBoolean</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ActiveMasterManager.html#clusterHasActiveMaster">clusterHasActiveMaster</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>(package private) <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicBoolean.html?is-external=true" title="class or interface in java.util.concurrent.atomic">AtomicBoolean</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ActiveMasterManager.html#clusterShutDown">clusterShutDown</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>(package private) int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ActiveMasterManager.html#infoPort">infoPort</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private static org.slf4j.Logger</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ActiveMasterManager.html#LOG">LOG</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>(package private) <a href="../../../../../org/apache/hadoop/hbase/Server.html" title="interface in org.apache.hadoop.hbase">Server</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ActiveMasterManager.html#master">master</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>(package private) <a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ActiveMasterManager.html#sn">sn</a></span></code>&nbsp;</td>
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<code><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html#watcher">watcher</a></code></li>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ActiveMasterManager.html#ActiveMasterManager-org.apache.hadoop.hbase.zookeeper.ZKWatcher-org.apache.hadoop.hbase.ServerName-org.apache.hadoop.hbase.Server-">ActiveMasterManager</a></span>(<a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKWatcher.html" title="class in org.apache.hadoop.hbase.zookeeper">ZKWatcher</a>&nbsp;watcher,
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<td class="colFirst"><code>(package private) boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ActiveMasterManager.html#blockUntilBecomingActiveMaster-int-org.apache.hadoop.hbase.monitoring.TaskGroup-">blockUntilBecomingActiveMaster</a></span>(int&nbsp;checkInterval,
<a href="../../../../../org/apache/hadoop/hbase/monitoring/TaskGroup.html" title="class in org.apache.hadoop.hbase.monitoring">TaskGroup</a>&nbsp;startupTaskGroup)</code>
<div class="block">Block until becoming the active master.</div>
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<td class="colFirst"><code>private void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ActiveMasterManager.html#fetchAndSetActiveMasterServerName--">fetchAndSetActiveMasterServerName</a></span>()</code>
<div class="block">Fetches the active master's ServerName from zookeeper.</div>
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<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ActiveMasterManager.html#getActiveMasterInfoPort--">getActiveMasterInfoPort</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html?is-external=true" title="class or interface in java.util">Optional</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ActiveMasterManager.html#getActiveMasterServerName--">getActiveMasterServerName</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ActiveMasterManager.html#getBackupMasterInfoPort-org.apache.hadoop.hbase.ServerName-">getBackupMasterInfoPort</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;sn)</code>&nbsp;</td>
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<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ActiveMasterManager.html#getBackupMasters--">getBackupMasters</a></span>()</code>
<div class="block">Returns list of registered backup masters.</div>
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<td class="colFirst"><code>(package private) void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ActiveMasterManager.html#handle-java.lang.String-">handle</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;path)</code>&nbsp;</td>
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<td class="colFirst"><code>private void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ActiveMasterManager.html#handleMasterNodeChange--">handleMasterNodeChange</a></span>()</code>
<div class="block">Handle a change in the master node.</div>
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<td class="colFirst"><code>(package private) boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ActiveMasterManager.html#hasActiveMaster--">hasActiveMaster</a></span>()</code>
<div class="block">Returns True if cluster has an active master.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ActiveMasterManager.html#nodeChildrenChanged-java.lang.String-">nodeChildrenChanged</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;path)</code>
<div class="block">Called when an existing node has a child node added or removed.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ActiveMasterManager.html#nodeCreated-java.lang.String-">nodeCreated</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;path)</code>
<div class="block">Called when a new node has been created.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ActiveMasterManager.html#nodeDeleted-java.lang.String-">nodeDeleted</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;path)</code>
<div class="block">Called when a node has been deleted</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ActiveMasterManager.html#setInfoPort-int-">setInfoPort</a></span>(int&nbsp;infoPort)</code>&nbsp;</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ActiveMasterManager.html#stop--">stop</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>private void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/ActiveMasterManager.html#updateBackupMasters--">updateBackupMasters</a></span>()</code>&nbsp;</td>
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<pre>private static final&nbsp;org.slf4j.Logger <a href="../../../../../src-html/org/apache/hadoop/hbase/master/ActiveMasterManager.html#line.61">LOG</a></pre>
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<pre>final&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicBoolean.html?is-external=true" title="class or interface in java.util.concurrent.atomic">AtomicBoolean</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/master/ActiveMasterManager.html#line.63">clusterHasActiveMaster</a></pre>
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<pre>final&nbsp;<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/master/ActiveMasterManager.html#line.68">sn</a></pre>
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<pre>final&nbsp;<a href="../../../../../org/apache/hadoop/hbase/Server.html" title="interface in org.apache.hadoop.hbase">Server</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/master/ActiveMasterManager.html#line.69">master</a></pre>
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<pre><a href="../../../../../src-html/org/apache/hadoop/hbase/master/ActiveMasterManager.html#line.84">ActiveMasterManager</a>(<a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKWatcher.html" title="class in org.apache.hadoop.hbase.zookeeper">ZKWatcher</a>&nbsp;watcher,
<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;sn,
<a href="../../../../../org/apache/hadoop/hbase/Server.html" title="interface in org.apache.hadoop.hbase">Server</a>&nbsp;master)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/InterruptedIOException.html?is-external=true" title="class or interface in java.io">InterruptedIOException</a></pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>watcher</code> - ZK watcher</dd>
<dd><code>sn</code> - ServerName</dd>
<dd><code>master</code> - In an instance of a Master.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/InterruptedIOException.html?is-external=true" title="class or interface in java.io">InterruptedIOException</a></code></dd>
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<pre>public&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/master/ActiveMasterManager.html#line.94">setInfoPort</a>(int&nbsp;infoPort)</pre>
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<pre>public&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/master/ActiveMasterManager.html#line.99">nodeCreated</a>(<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;path)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html#nodeCreated-java.lang.String-">ZKListener</a></code></span></div>
<div class="block">Called when a new node has been created.</div>
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<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html#nodeCreated-java.lang.String-">nodeCreated</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html" title="class in org.apache.hadoop.hbase.zookeeper">ZKListener</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>path</code> - full path of the new node</dd>
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<pre>public&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/master/ActiveMasterManager.html#line.104">nodeChildrenChanged</a>(<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;path)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html#nodeChildrenChanged-java.lang.String-">ZKListener</a></code></span></div>
<div class="block">Called when an existing node has a child node added or removed.</div>
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<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html#nodeChildrenChanged-java.lang.String-">nodeChildrenChanged</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html" title="class in org.apache.hadoop.hbase.zookeeper">ZKListener</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>path</code> - full path of the node whose children have changed</dd>
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<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html#nodeDeleted-java.lang.String-">ZKListener</a></code></span></div>
<div class="block">Called when a node has been deleted</div>
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<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html#nodeDeleted-java.lang.String-">nodeDeleted</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html" title="class in org.apache.hadoop.hbase.zookeeper">ZKListener</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>path</code> - full path of the deleted node</dd>
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<pre>void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/master/ActiveMasterManager.html#line.129">handle</a>(<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;path)</pre>
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<pre>private&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/master/ActiveMasterManager.html#line.135">updateBackupMasters</a>()
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/InterruptedIOException.html?is-external=true" title="class or interface in java.io">InterruptedIOException</a></pre>
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<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/InterruptedIOException.html?is-external=true" title="class or interface in java.io">InterruptedIOException</a></code></dd>
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<pre>private&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/master/ActiveMasterManager.html#line.143">fetchAndSetActiveMasterServerName</a>()</pre>
<div class="block">Fetches the active master's ServerName from zookeeper.</div>
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<pre>private&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/master/ActiveMasterManager.html#line.194">handleMasterNodeChange</a>()</pre>
<div class="block">Handle a change in the master node. Doesn't matter whether this was called from a nodeCreated
or nodeDeleted event because there are no guarantees that the current state of the master node
matches the event at the time of our next ZK request.
<p>
Uses the watchAndCheckExists method which watches the master address node regardless of whether
it exists or not. If it does exist (there is an active master), it returns true. Otherwise it
returns false.
<p>
A watcher is set which guarantees that this method will get called again if there is another
change in the master node.</div>
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<pre>boolean&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/master/ActiveMasterManager.html#line.227">blockUntilBecomingActiveMaster</a>(int&nbsp;checkInterval,
<a href="../../../../../org/apache/hadoop/hbase/monitoring/TaskGroup.html" title="class in org.apache.hadoop.hbase.monitoring">TaskGroup</a>&nbsp;startupTaskGroup)</pre>
<div class="block">Block until becoming the active master. Method blocks until there is not another active master
and our attempt to become the new active master is successful. This also makes sure that we are
watching the master znode so will be notified if another master dies.</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>checkInterval</code> - the interval to check if the master is stopped</dd>
<dd><code>startupTaskGroup</code> - the task group for master startup to track the progress</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>True if no issue becoming active master else false if another master was running or if
some other problem (zookeeper, stop flag has been set on this Master)</dd>
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<div class="block">Returns True if cluster has an active master.</div>
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<pre>public&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/master/ActiveMasterManager.html#line.332">stop</a>()</pre>
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<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/master/ActiveMasterManager.html#line.358">getBackupMasters</a>()</pre>
<div class="block">Returns list of registered backup masters.</div>
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