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+<title>LearnerHandler (Apache ZooKeeper - Server 3.8.1 API)</title>
+<meta name="date" content="2023-01-25">
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+<ul class="navList" title="Navigation">
+<li><a href="../../../../../overview-summary.html">Overview</a></li>
+<li><a href="package-summary.html">Package</a></li>
+<li class="navBarCell1Rev">Class</li>
+<li><a href="class-use/LearnerHandler.html">Use</a></li>
+<li><a href="package-tree.html">Tree</a></li>
+<li><a href="../../../../../deprecated-list.html">Deprecated</a></li>
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+<div class="subNav">
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+<li><a href="../../../../../org/apache/zookeeper/server/quorum/Learner.html" title="class in org.apache.zookeeper.server.quorum"><span class="typeNameLink">Prev&nbsp;Class</span></a></li>
+<li><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandlerBean.html" title="class in org.apache.zookeeper.server.quorum"><span class="typeNameLink">Next&nbsp;Class</span></a></li>
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+</div>
+<div>
+<ul class="subNavList">
+<li>Summary:&nbsp;</li>
+<li><a href="#nested.classes.inherited.from.class.java.lang.Thread">Nested</a>&nbsp;|&nbsp;</li>
+<li><a href="#field.summary">Field</a>&nbsp;|&nbsp;</li>
+<li>Constr&nbsp;|&nbsp;</li>
+<li><a href="#method.summary">Method</a></li>
+</ul>
+<ul class="subNavList">
+<li>Detail:&nbsp;</li>
+<li><a href="#field.detail">Field</a>&nbsp;|&nbsp;</li>
+<li>Constr&nbsp;|&nbsp;</li>
+<li><a href="#method.detail">Method</a></li>
+</ul>
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+<!-- ========= END OF TOP NAVBAR ========= -->
+<!-- ======== START OF CLASS DATA ======== -->
+<div class="header">
+<div class="subTitle">org.apache.zookeeper.server.quorum</div>
+<h2 title="Class LearnerHandler" class="title">Class LearnerHandler</h2>
+</div>
+<div class="contentContainer">
+<ul class="inheritance">
+<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>
+<li>
+<ul class="inheritance">
+<li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang">java.lang.Thread</a></li>
+<li>
+<ul class="inheritance">
+<li><a href="../../../../../org/apache/zookeeper/server/ZooKeeperThread.html" title="class in org.apache.zookeeper.server">org.apache.zookeeper.server.ZooKeeperThread</a></li>
+<li>
+<ul class="inheritance">
+<li>org.apache.zookeeper.server.quorum.LearnerHandler</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+<div class="description">
+<ul class="blockList">
+<li class="blockList">
+<dl>
+<dt>All Implemented Interfaces:</dt>
+<dd><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Runnable.html?is-external=true" title="class or interface in java.lang">Runnable</a></dd>
+</dl>
+<hr>
+<br>
+<pre>public class <span class="typeNameLabel">LearnerHandler</span>
+extends <a href="../../../../../org/apache/zookeeper/server/ZooKeeperThread.html" title="class in org.apache.zookeeper.server">ZooKeeperThread</a></pre>
+<div class="block">There will be an instance of this class created by the Leader for each
+ learner. All communication with a learner is handled by this
+ class.</div>
+</li>
+</ul>
+</div>
+<div class="summary">
+<ul class="blockList">
+<li class="blockList">
+<!-- ======== NESTED CLASS SUMMARY ======== -->
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+<h3>Nested classes/interfaces inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang">Thread</a></h3>
+<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.State.html?is-external=true" title="class or interface in java.lang">Thread.State</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.UncaughtExceptionHandler.html?is-external=true" title="class or interface in java.lang">Thread.UncaughtExceptionHandler</a></code></li>
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+</ul>
+<!-- =========== FIELD SUMMARY =========== -->
+<ul class="blockList">
+<li class="blockList"><a name="field.summary">
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+</a>
+<h3>Field Summary</h3>
+<table class="memberSummary" 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>static boolean</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html#closeSocketAsync">closeSocketAsync</a></span></code>&nbsp;</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Date.html?is-external=true" title="class or interface in java.util">Date</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html#established">established</a></span></code>&nbsp;</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>static <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/zookeeper/server/quorum/LearnerHandler.html#FORCE_SNAP_SYNC">FORCE_SNAP_SYNC</a></span></code>
+<div class="block">For testing purpose, force learnerMaster to use snapshot to sync with followers</div>
+</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>protected long</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html#lastZxid">lastZxid</a></span></code>&nbsp;</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>static <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/zookeeper/server/quorum/LearnerHandler.html#LEADER_CLOSE_SOCKET_ASYNC">LEADER_CLOSE_SOCKET_ASYNC</a></span></code>&nbsp;</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>protected <a href="../../../../../org/apache/zookeeper/server/util/MessageTracker.html" title="class in org.apache.zookeeper.server.util">MessageTracker</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html#messageTracker">messageTracker</a></span></code>&nbsp;</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicLong.html?is-external=true" title="class or interface in java.util.concurrent.atomic">AtomicLong</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html#packetsReceived">packetsReceived</a></span></code>&nbsp;</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicLong.html?is-external=true" title="class or interface in java.util.concurrent.atomic">AtomicLong</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html#packetsSent">packetsSent</a></span></code>&nbsp;</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicLong.html?is-external=true" title="class or interface in java.util.concurrent.atomic">AtomicLong</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html#requestsReceived">requestsReceived</a></span></code>&nbsp;</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>protected long</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html#sid">sid</a></span></code>
+<div class="block">ZooKeeper server identifier of this learner</div>
+</td>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/net/Socket.html?is-external=true" title="class or interface in java.net">Socket</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html#sock">sock</a></span></code>&nbsp;</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>protected int</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html#version">version</a></span></code>&nbsp;</td>
+</tr>
+</table>
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+</a>
+<h3>Fields inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang">Thread</a></h3>
+<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#MAX_PRIORITY" title="class or interface in java.lang">MAX_PRIORITY</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#MIN_PRIORITY" title="class or interface in java.lang">MIN_PRIORITY</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true#NORM_PRIORITY" title="class or interface in java.lang">NORM_PRIORITY</a></code></li>
+</ul>
+</li>
+</ul>
+<!-- ========== METHOD SUMMARY =========== -->
+<ul class="blockList">
+<li class="blockList"><a name="method.summary">
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+</a>
+<h3>Method Summary</h3>
+<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
+<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></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>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Method and Description</th>
+</tr>
+<tr id="i0" class="altColor">
+<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Date.html?is-external=true" title="class or interface in java.util">Date</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html#getEstablished--">getEstablished</a></span>()</code>&nbsp;</td>
+</tr>
+<tr id="i1" class="rowColor">
+<td class="colFirst"><code>long</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html#getLastZxid--">getLastZxid</a></span>()</code>&nbsp;</td>
+</tr>
+<tr id="i2" class="altColor">
+<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;<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="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&gt;</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html#getLearnerHandlerInfo--">getLearnerHandlerInfo</a></span>()</code>&nbsp;</td>
+</tr>
+<tr id="i3" class="rowColor">
+<td class="colFirst"><code><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumPeer.LearnerType.html" title="enum in org.apache.zookeeper.server.quorum">QuorumPeer.LearnerType</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html#getLearnerType--">getLearnerType</a></span>()</code>&nbsp;</td>
+</tr>
+<tr id="i4" class="altColor">
+<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Queue.html?is-external=true" title="class or interface in java.util">Queue</a>&lt;<a href="http://zookeeper.apache.org/zookeeper-jute/apidocs/org/apache/zookeeper/server/quorum/QuorumPacket.html?is-external=true" title="class or interface in org.apache.zookeeper.server.quorum">QuorumPacket</a>&gt;</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html#getQueuedPackets--">getQueuedPackets</a></span>()</code>
+<div class="block">For testing, return packet queue</div>
+</td>
+</tr>
+<tr id="i5" class="rowColor">
+<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/net/Socket.html?is-external=true" title="class or interface in java.net">Socket</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html#getSocket--">getSocket</a></span>()</code>&nbsp;</td>
+</tr>
+<tr id="i6" class="altColor">
+<td class="colFirst"><code>static <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/zookeeper/server/quorum/LearnerHandler.html#packetToString-org.apache.zookeeper.server.quorum.QuorumPacket-">packetToString</a></span>(<a href="http://zookeeper.apache.org/zookeeper-jute/apidocs/org/apache/zookeeper/server/quorum/QuorumPacket.html?is-external=true" title="class or interface in org.apache.zookeeper.server.quorum">QuorumPacket</a>&nbsp;p)</code>&nbsp;</td>
+</tr>
+<tr id="i7" class="rowColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html#ping--">ping</a></span>()</code>
+<div class="block">ping calls from the learnerMaster to the peers</div>
+</td>
+</tr>
+<tr id="i8" class="altColor">
+<td class="colFirst"><code>protected long</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html#queueCommittedProposals-java.util.Iterator-long-java.lang.Long-java.lang.Long-">queueCommittedProposals</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a>&lt;<a href="../../../../../org/apache/zookeeper/server/quorum/Leader.Proposal.html" title="class in org.apache.zookeeper.server.quorum">Leader.Proposal</a>&gt;&nbsp;itr,
+ long&nbsp;peerLastZxid,
+ <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>&nbsp;maxZxid,
+ <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>&nbsp;lastCommittedZxid)</code>
+<div class="block">Queue committed proposals into packet queue.</div>
+</td>
+</tr>
+<tr id="i9" class="rowColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html#resetObserverConnectionStats--">resetObserverConnectionStats</a></span>()</code>&nbsp;</td>
+</tr>
+<tr id="i10" class="altColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html#run--">run</a></span>()</code>
+<div class="block">This thread will receive packets from the peer and process them and
+ also listen to new connections from new peers.</div>
+</td>
+</tr>
+<tr id="i11" class="rowColor">
+<td class="colFirst"><code>protected void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html#setBufferedOutput-java.io.BufferedOutputStream-">setBufferedOutput</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/BufferedOutputStream.html?is-external=true" title="class or interface in java.io">BufferedOutputStream</a>&nbsp;bufferedOutput)</code>&nbsp;</td>
+</tr>
+<tr id="i12" class="altColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html#setFirstPacket-boolean-">setFirstPacket</a></span>(boolean&nbsp;value)</code>
+<div class="block">For testing, we need to reset this value</div>
+</td>
+</tr>
+<tr id="i13" class="rowColor">
+<td class="colFirst"><code>protected void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html#setOutputArchive-org.apache.jute.BinaryOutputArchive-">setOutputArchive</a></span>(<a href="http://zookeeper.apache.org/zookeeper-jute/apidocs/org/apache/jute/BinaryOutputArchive.html?is-external=true" title="class or interface in org.apache.jute">BinaryOutputArchive</a>&nbsp;oa)</code>&nbsp;</td>
+</tr>
+<tr id="i14" class="altColor">
+<td class="colFirst"><code>protected boolean</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html#shouldSendMarkerPacketForLogging--">shouldSendMarkerPacketForLogging</a></span>()</code>
+<div class="block">Tests need not send marker packets as they are only needed to
+ log quorum packet delays</div>
+</td>
+</tr>
+<tr id="i15" class="rowColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html#shutdown--">shutdown</a></span>()</code>&nbsp;</td>
+</tr>
+<tr id="i16" class="altColor">
+<td class="colFirst"><code>protected void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/LearnerHandler.html#startSendingPackets--">startSendingPackets</a></span>()</code>
+<div class="block">Start thread that will forward any packet in the queue to the follower</div>
+</td>
+</tr>
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+<div class="block">ping calls from the learnerMaster to the peers</div>
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+<h4>synced</h4>
+<pre>public&nbsp;boolean&nbsp;synced()</pre>
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+<h4>getLearnerHandlerInfo</h4>
+<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;<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="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&gt;&nbsp;getLearnerHandlerInfo()</pre>
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+<pre>public&nbsp;void&nbsp;resetObserverConnectionStats()</pre>
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+<h4>getQueuedPackets</h4>
+<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Queue.html?is-external=true" title="class or interface in java.util">Queue</a>&lt;<a href="http://zookeeper.apache.org/zookeeper-jute/apidocs/org/apache/zookeeper/server/quorum/QuorumPacket.html?is-external=true" title="class or interface in org.apache.zookeeper.server.quorum">QuorumPacket</a>&gt;&nbsp;getQueuedPackets()</pre>
+<div class="block">For testing, return packet queue</div>
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+<a name="setFirstPacket-boolean-">
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+<h4>setFirstPacket</h4>
+<pre>public&nbsp;void&nbsp;setFirstPacket(boolean&nbsp;value)</pre>
+<div class="block">For testing, we need to reset this value</div>
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