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<h2 title="Class FastLeaderElection" class="title">Class FastLeaderElection</h2>
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<dd><a href="../../../../../org/apache/zookeeper/server/quorum/Election.html" title="interface in org.apache.zookeeper.server.quorum">Election</a></dd>
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<pre>public class <span class="typeNameLabel">FastLeaderElection</span>
extends <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>
implements <a href="../../../../../org/apache/zookeeper/server/quorum/Election.html" title="interface in org.apache.zookeeper.server.quorum">Election</a></pre>
<div class="block">Implementation of leader election using TCP. It uses an object of the class
QuorumCnxManager to manage connections. Otherwise, the algorithm is push-based
as with the other UDP implementations.
There are a few parameters that can be tuned to change its behavior. First,
finalizeWait determines the amount of time to wait until deciding upon a leader.
This is part of the leader election algorithm.</div>
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<td class="colFirst"><code>protected class </code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/FastLeaderElection.Messenger.html" title="class in org.apache.zookeeper.server.quorum">FastLeaderElection.Messenger</a></span></code>
<div class="block">Multi-threaded implementation of message handler.</div>
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<td class="colFirst"><code>static class </code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/FastLeaderElection.Notification.html" title="class in org.apache.zookeeper.server.quorum">FastLeaderElection.Notification</a></span></code>
<div class="block">Notifications are messages that let other peers know that
a given peer has changed its vote, either because it has
joined leader election or because it learned of another
peer with higher zxid or same zxid and higher server id</div>
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<tr class="altColor">
<td class="colFirst"><code>static class </code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/FastLeaderElection.ToSend.html" title="class in org.apache.zookeeper.server.quorum">FastLeaderElection.ToSend</a></span></code>
<div class="block">Messages that a peer wants to send to other peers.</div>
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<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>
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<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/FastLeaderElection.html#MIN_NOTIFICATION_INTERVAL">MIN_NOTIFICATION_INTERVAL</a></span></code>
<div class="block">Minimum notification interval, default is equal to finalizeWait</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/FastLeaderElection.html#FastLeaderElection-org.apache.zookeeper.server.quorum.QuorumPeer-org.apache.zookeeper.server.quorum.QuorumCnxManager-">FastLeaderElection</a></span>(<a href="../../../../../org/apache/zookeeper/server/quorum/QuorumPeer.html" title="class in org.apache.zookeeper.server.quorum">QuorumPeer</a> self,
<a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html" title="class in org.apache.zookeeper.server.quorum">QuorumCnxManager</a> manager)</code>
<div class="block">Constructor of FastLeaderElection.</div>
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<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/FastLeaderElection.html#checkLeader-java.util.Map-long-long-">checkLeader</a></span>(<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><<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>,<a href="../../../../../org/apache/zookeeper/server/quorum/Vote.html" title="class in org.apache.zookeeper.server.quorum">Vote</a>> votes,
long leader,
long electionEpoch)</code>
<div class="block">In the case there is a leader elected, and a quorum supporting
this leader, we have to check if the leader has voted and acked
that it is leading.</div>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html" title="class in org.apache.zookeeper.server.quorum">QuorumCnxManager</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/FastLeaderElection.html#getCnxManager--">getCnxManager</a></span>()</code> </td>
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<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/FastLeaderElection.html#getLogicalClock--">getLogicalClock</a></span>()</code>
<div class="block">Returns the current value of the logical clock counter</div>
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<td class="colFirst"><code><a href="../../../../../org/apache/zookeeper/server/quorum/Vote.html" title="class in org.apache.zookeeper.server.quorum">Vote</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/FastLeaderElection.html#getVote--">getVote</a></span>()</code> </td>
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<td class="colFirst"><code>protected <a href="../../../../../org/apache/zookeeper/server/quorum/SyncedLearnerTracker.html" title="class in org.apache.zookeeper.server.quorum">SyncedLearnerTracker</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/FastLeaderElection.html#getVoteTracker-java.util.Map-org.apache.zookeeper.server.quorum.Vote-">getVoteTracker</a></span>(<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><<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>,<a href="../../../../../org/apache/zookeeper/server/quorum/Vote.html" title="class in org.apache.zookeeper.server.quorum">Vote</a>> votes,
<a href="../../../../../org/apache/zookeeper/server/quorum/Vote.html" title="class in org.apache.zookeeper.server.quorum">Vote</a> vote)</code>
<div class="block">Given a set of votes, return the SyncedLearnerTracker which is used to
determines if have sufficient to declare the end of the election round.</div>
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<td class="colFirst"><code><a href="../../../../../org/apache/zookeeper/server/quorum/Vote.html" title="class in org.apache.zookeeper.server.quorum">Vote</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/FastLeaderElection.html#lookForLeader--">lookForLeader</a></span>()</code>
<div class="block">Starts a new round of leader election.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/FastLeaderElection.html#shutdown--">shutdown</a></span>()</code> </td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/FastLeaderElection.html#start--">start</a></span>()</code>
<div class="block">This method starts the sender and receiver threads.</div>
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<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/zookeeper/server/quorum/FastLeaderElection.html#totalOrderPredicate-long-long-long-long-long-long-">totalOrderPredicate</a></span>(long newId,
long newZxid,
long newEpoch,
long curId,
long curZxid,
long curEpoch)</code>
<div class="block">Check if a pair (server id, zxid) succeeds our
current vote.</div>
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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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<h4>MIN_NOTIFICATION_INTERVAL</h4>
<pre>public static final <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> MIN_NOTIFICATION_INTERVAL</pre>
<div class="block">Minimum notification interval, default is equal to finalizeWait</div>
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<h4>MAX_NOTIFICATION_INTERVAL</h4>
<pre>public static final <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> MAX_NOTIFICATION_INTERVAL</pre>
<div class="block">Maximum notification interval, default is 60s</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../constant-values.html#org.apache.zookeeper.server.quorum.FastLeaderElection.MAX_NOTIFICATION_INTERVAL">Constant Field Values</a></dd>
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<h4>FastLeaderElection</h4>
<pre>public FastLeaderElection(<a href="../../../../../org/apache/zookeeper/server/quorum/QuorumPeer.html" title="class in org.apache.zookeeper.server.quorum">QuorumPeer</a> self,
<a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html" title="class in org.apache.zookeeper.server.quorum">QuorumCnxManager</a> manager)</pre>
<div class="block">Constructor of FastLeaderElection. It takes two parameters, one
is the QuorumPeer object that instantiated this object, and the other
is the connection manager. Such an object should be created only once
by each peer during an instance of the ZooKeeper service.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>self</code> - QuorumPeer that created this object</dd>
<dd><code>manager</code> - Connection manager</dd>
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<h4>getLogicalClock</h4>
<pre>public long getLogicalClock()</pre>
<div class="block">Returns the current value of the logical clock counter</div>
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<h4>start</h4>
<pre>public void start()</pre>
<div class="block">This method starts the sender and receiver threads.</div>
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<h4>getCnxManager</h4>
<pre>public <a href="../../../../../org/apache/zookeeper/server/quorum/QuorumCnxManager.html" title="class in org.apache.zookeeper.server.quorum">QuorumCnxManager</a> getCnxManager()</pre>
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<h4>shutdown</h4>
<pre>public void shutdown()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/zookeeper/server/quorum/Election.html#shutdown--">shutdown</a></code> in interface <code><a href="../../../../../org/apache/zookeeper/server/quorum/Election.html" title="interface in org.apache.zookeeper.server.quorum">Election</a></code></dd>
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<h4>totalOrderPredicate</h4>
<pre>protected boolean totalOrderPredicate(long newId,
long newZxid,
long newEpoch,
long curId,
long curZxid,
long curEpoch)</pre>
<div class="block">Check if a pair (server id, zxid) succeeds our
current vote.</div>
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<h4>getVoteTracker</h4>
<pre>protected <a href="../../../../../org/apache/zookeeper/server/quorum/SyncedLearnerTracker.html" title="class in org.apache.zookeeper.server.quorum">SyncedLearnerTracker</a> getVoteTracker(<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><<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>,<a href="../../../../../org/apache/zookeeper/server/quorum/Vote.html" title="class in org.apache.zookeeper.server.quorum">Vote</a>> votes,
<a href="../../../../../org/apache/zookeeper/server/quorum/Vote.html" title="class in org.apache.zookeeper.server.quorum">Vote</a> vote)</pre>
<div class="block">Given a set of votes, return the SyncedLearnerTracker which is used to
determines if have sufficient to declare the end of the election round.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>votes</code> - Set of votes</dd>
<dd><code>vote</code> - Identifier of the vote received last</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the SyncedLearnerTracker with vote details</dd>
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<h4>checkLeader</h4>
<pre>protected boolean checkLeader(<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><<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>,<a href="../../../../../org/apache/zookeeper/server/quorum/Vote.html" title="class in org.apache.zookeeper.server.quorum">Vote</a>> votes,
long leader,
long electionEpoch)</pre>
<div class="block">In the case there is a leader elected, and a quorum supporting
this leader, we have to check if the leader has voted and acked
that it is leading. We need this check to avoid that peers keep
electing over and over a peer that has crashed and it is no
longer leading.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>votes</code> - set of votes</dd>
<dd><code>leader</code> - leader id</dd>
<dd><code>electionEpoch</code> - epoch id</dd>
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<h4>getVote</h4>
<pre>public <a href="../../../../../org/apache/zookeeper/server/quorum/Vote.html" title="class in org.apache.zookeeper.server.quorum">Vote</a> getVote()</pre>
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<h4>lookForLeader</h4>
<pre>public <a href="../../../../../org/apache/zookeeper/server/quorum/Vote.html" title="class in org.apache.zookeeper.server.quorum">Vote</a> lookForLeader()
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></pre>
<div class="block">Starts a new round of leader election. Whenever our QuorumPeer
changes its state to LOOKING, this method is invoked, and it
sends notifications to all other peers.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/zookeeper/server/quorum/Election.html#lookForLeader--">lookForLeader</a></code> in interface <code><a href="../../../../../org/apache/zookeeper/server/quorum/Election.html" title="interface in org.apache.zookeeper.server.quorum">Election</a></code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></code></dd>
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