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<div class="subTitle">org.apache.hadoop.hbase.zookeeper</div>
<h2 title="Class ZKLeaderManager" class="title">Class ZKLeaderManager</h2>
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<li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
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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.zookeeper.ZKLeaderManager</li>
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<div class="description">
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<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;
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<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a>
@InterfaceAudience.Private
public class <a href="../../../../../src-html/org/apache/hadoop/hbase/zookeeper/ZKLeaderManager.html#line.43">ZKLeaderManager</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 coordination of a single "leader" instance among many possible
candidates. The first <a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKLeaderManager.html" title="class in org.apache.hadoop.hbase.zookeeper"><code>ZKLeaderManager</code></a> to successfully create
the given znode becomes the leader, allowing the instance to continue
with whatever processing must be protected. Other <a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKLeaderManager.html" title="class in org.apache.hadoop.hbase.zookeeper"><code>ZKLeaderManager</code></a>
instances will wait to be notified of changes to the leader znode.
If the current master instance fails, the ephemeral leader znode will
be removed, and all waiting instances will be notified, with the race
to claim the leader znode beginning all over again.</div>
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<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
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<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>private <a href="../../../../../org/apache/hadoop/hbase/Stoppable.html" title="interface in org.apache.hadoop.hbase">Stoppable</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKLeaderManager.html#candidate">candidate</a></span></code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
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<td class="colFirst"><code>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/zookeeper/ZKLeaderManager.html#leaderExists">leaderExists</a></span></code>
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<td class="colFirst"><code>private <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/hbase/zookeeper/ZKLeaderManager.html#leaderZNode">leaderZNode</a></span></code>
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<td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKLeaderManager.html#lock">lock</a></span></code>
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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/zookeeper/ZKLeaderManager.html#LOG">LOG</a></span></code>
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<td class="colFirst"><code>private byte[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKLeaderManager.html#nodeId">nodeId</a></span></code>
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<code><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html#watcher">watcher</a></code></li>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKLeaderManager.html#ZKLeaderManager-org.apache.hadoop.hbase.zookeeper.ZKWatcher-java.lang.String-byte:A-org.apache.hadoop.hbase.Stoppable-">ZKLeaderManager</a></span>(<a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKWatcher.html" title="class in org.apache.hadoop.hbase.zookeeper">ZKWatcher</a>&nbsp;watcher,
<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;leaderZNode,
byte[]&nbsp;identifier,
<a href="../../../../../org/apache/hadoop/hbase/Stoppable.html" title="interface in org.apache.hadoop.hbase">Stoppable</a>&nbsp;candidate)</code>
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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/zookeeper/ZKLeaderManager.html#handleLeaderChange--">handleLeaderChange</a></span>()</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKLeaderManager.html#hasLeader--">hasLeader</a></span>()</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
&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/zookeeper/ZKLeaderManager.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"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
<div class="block">Called when a new node has been created.</div>
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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/hbase/zookeeper/ZKLeaderManager.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"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
<div class="block">Called when a node has been deleted</div>
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<tr id="i4" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKLeaderManager.html#start--">start</a></span>()</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
&nbsp;</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/hbase/zookeeper/ZKLeaderManager.html#stepDownAsLeader--">stepDownAsLeader</a></span>()</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
<div class="block">Removes the leader znode, if it is currently claimed by this instance.</div>
</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/zookeeper/ZKLeaderManager.html#waitToBecomeLeader--">waitToBecomeLeader</a></span>()</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
<div class="block">Blocks until this instance has claimed the leader ZNode in ZooKeeper</div>
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<code><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html#getWatcher--">getWatcher</a>, <a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html#nodeChildrenChanged-java.lang.String-">nodeChildrenChanged</a>, <a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html#nodeDataChanged-java.lang.String-">nodeDataChanged</a></code></li>
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<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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<pre>private static final&nbsp;org.slf4j.Logger <a href="../../../../../src-html/org/apache/hadoop/hbase/zookeeper/ZKLeaderManager.html#line.44">LOG</a></pre>
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<pre>private final&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/zookeeper/ZKLeaderManager.html#line.46">lock</a></pre>
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<pre>private 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/zookeeper/ZKLeaderManager.html#line.47">leaderExists</a></pre>
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<pre>private final&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> <a href="../../../../../src-html/org/apache/hadoop/hbase/zookeeper/ZKLeaderManager.html#line.48">leaderZNode</a></pre>
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<pre>private final&nbsp;byte[] <a href="../../../../../src-html/org/apache/hadoop/hbase/zookeeper/ZKLeaderManager.html#line.49">nodeId</a></pre>
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<pre>private final&nbsp;<a href="../../../../../org/apache/hadoop/hbase/Stoppable.html" title="interface in org.apache.hadoop.hbase">Stoppable</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/zookeeper/ZKLeaderManager.html#line.50">candidate</a></pre>
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<pre>public&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/zookeeper/ZKLeaderManager.html#line.52">ZKLeaderManager</a>(<a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKWatcher.html" title="class in org.apache.hadoop.hbase.zookeeper">ZKWatcher</a>&nbsp;watcher,
<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;leaderZNode,
byte[]&nbsp;identifier,
<a href="../../../../../org/apache/hadoop/hbase/Stoppable.html" title="interface in org.apache.hadoop.hbase">Stoppable</a>&nbsp;candidate)</pre>
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<pre>public&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/zookeeper/ZKLeaderManager.html#line.60">start</a>()</pre>
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<pre>public&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/zookeeper/ZKLeaderManager.html#line.74">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="deprecatedLabel">Deprecated.</span>&nbsp;</div>
<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="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/zookeeper/ZKLeaderManager.html#line.81">nodeDeleted</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="deprecatedLabel">Deprecated.</span>&nbsp;</div>
<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="paramLabel">Parameters:</span></dt>
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<pre>private&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/zookeeper/ZKLeaderManager.html#line.87">handleLeaderChange</a>()</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
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<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
<div class="block">Blocks until this instance has claimed the leader ZNode in ZooKeeper</div>
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<pre>public&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/zookeeper/ZKLeaderManager.html#line.155">stepDownAsLeader</a>()</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
<div class="block">Removes the leader znode, if it is currently claimed by this instance.</div>
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<pre>public&nbsp;boolean&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/zookeeper/ZKLeaderManager.html#line.181">hasLeader</a>()</pre>
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