cassandra-server
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A thin Javascript wrapper around Apache Cassandra to provide out of the box server support
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<div class="subTitle">org.apache.cassandra.gms</div>
<h2 title="Class FailureDetector" class="title">Class FailureDetector</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
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<li>org.apache.cassandra.gms.FailureDetector</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../org/apache/cassandra/gms/FailureDetectorMBean.html" title="interface in org.apache.cassandra.gms">FailureDetectorMBean</a>, <a href="../../../../org/apache/cassandra/gms/IFailureDetector.html" title="interface in org.apache.cassandra.gms">IFailureDetector</a></dd>
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<pre>public class <span class="strong">FailureDetector</span>
extends java.lang.Object
implements <a href="../../../../org/apache/cassandra/gms/IFailureDetector.html" title="interface in org.apache.cassandra.gms">IFailureDetector</a>, <a href="../../../../org/apache/cassandra/gms/FailureDetectorMBean.html" title="interface in org.apache.cassandra.gms">FailureDetectorMBean</a></pre>
<div class="block">This FailureDetector is an implementation of the paper titled
"The Phi Accrual Failure Detector" by Hayashibara.
Check the paper and the <i>IFailureDetector</i> interface for details.</div>
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<caption><span>Fields</span><span class="tabEnd"> </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>protected static long</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/gms/FailureDetector.html#INITIAL_VALUE_NANOS">INITIAL_VALUE_NANOS</a></strong></code> </td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static <a href="../../../../org/apache/cassandra/gms/IFailureDetector.html" title="interface in org.apache.cassandra.gms">IFailureDetector</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/gms/FailureDetector.html#instance">instance</a></strong></code> </td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/gms/FailureDetector.html#MBEAN_NAME">MBEAN_NAME</a></strong></code> </td>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><strong><a href="../../../../org/apache/cassandra/gms/FailureDetector.html#FailureDetector()">FailureDetector</a></strong>()</code> </td>
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<caption><span>Methods</span><span class="tabEnd"> </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><strong><a href="../../../../org/apache/cassandra/gms/FailureDetector.html#dumpInterArrivalTimes()">dumpInterArrivalTimes</a></strong>()</code>
<div class="block">Dump the inter arrival times for examination if necessary.</div>
</td>
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<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/gms/FailureDetector.html#forceConviction(java.net.InetAddress)">forceConviction</a></strong>(java.net.InetAddress ep)</code>
<div class="block">force conviction of endpoint in the failure detector</div>
</td>
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<tr class="altColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/gms/FailureDetector.html#getAllEndpointStates()">getAllEndpointStates</a></strong>()</code> </td>
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<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/gms/FailureDetector.html#getDownEndpointCount()">getDownEndpointCount</a></strong>()</code> </td>
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<tr class="altColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/gms/FailureDetector.html#getEndpointState(java.lang.String)">getEndpointState</a></strong>(java.lang.String address)</code> </td>
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<tr class="rowColor">
<td class="colFirst"><code>double</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/gms/FailureDetector.html#getPhiConvictThreshold()">getPhiConvictThreshold</a></strong>()</code> </td>
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<tr class="altColor">
<td class="colFirst"><code>java.util.Map<java.lang.String,java.lang.String></code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/gms/FailureDetector.html#getSimpleStates()">getSimpleStates</a></strong>()</code> </td>
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<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/gms/FailureDetector.html#getUpEndpointCount()">getUpEndpointCount</a></strong>()</code> </td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/gms/FailureDetector.html#interpret(java.net.InetAddress)">interpret</a></strong>(java.net.InetAddress ep)</code>
<div class="block">This method is invoked by any entity wanting to interrogate the status of an endpoint.</div>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/gms/FailureDetector.html#isAlive(java.net.InetAddress)">isAlive</a></strong>(java.net.InetAddress ep)</code>
<div class="block">Failure Detector's knowledge of whether a node is up or
down.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/gms/FailureDetector.html#main(java.lang.String[])">main</a></strong>(java.lang.String[] args)</code> </td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/gms/FailureDetector.html#registerFailureDetectionEventListener(org.apache.cassandra.gms.IFailureDetectionEventListener)">registerFailureDetectionEventListener</a></strong>(<a href="../../../../org/apache/cassandra/gms/IFailureDetectionEventListener.html" title="interface in org.apache.cassandra.gms">IFailureDetectionEventListener</a> listener)</code>
<div class="block">Register interest for Failure Detector events.</div>
</td>
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<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/gms/FailureDetector.html#remove(java.net.InetAddress)">remove</a></strong>(java.net.InetAddress ep)</code>
<div class="block">remove endpoint from failure detector</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/gms/FailureDetector.html#report(java.net.InetAddress)">report</a></strong>(java.net.InetAddress ep)</code>
<div class="block">This method is invoked by the receiver of the heartbeat.</div>
</td>
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<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/gms/FailureDetector.html#setPhiConvictThreshold(double)">setPhiConvictThreshold</a></strong>(double phi)</code> </td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/gms/FailureDetector.html#toString()">toString</a></strong>()</code> </td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/gms/FailureDetector.html#unregisterFailureDetectionEventListener(org.apache.cassandra.gms.IFailureDetectionEventListener)">unregisterFailureDetectionEventListener</a></strong>(<a href="../../../../org/apache/cassandra/gms/IFailureDetectionEventListener.html" title="interface in org.apache.cassandra.gms">IFailureDetectionEventListener</a> listener)</code>
<div class="block">Un-register interest for Failure Detector events.</div>
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<h3>Methods inherited from class java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait</code></li>
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<h3>Field Detail</h3>
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<h4>MBEAN_NAME</h4>
<pre>public static final java.lang.String MBEAN_NAME</pre>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../constant-values.html#org.apache.cassandra.gms.FailureDetector.MBEAN_NAME">Constant Field Values</a></dd></dl>
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<h4>INITIAL_VALUE_NANOS</h4>
<pre>protected static final long INITIAL_VALUE_NANOS</pre>
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<h4>instance</h4>
<pre>public static final <a href="../../../../org/apache/cassandra/gms/IFailureDetector.html" title="interface in org.apache.cassandra.gms">IFailureDetector</a> instance</pre>
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<h4>FailureDetector</h4>
<pre>public FailureDetector()</pre>
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<h4>getAllEndpointStates</h4>
<pre>public java.lang.String getAllEndpointStates()</pre>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../org/apache/cassandra/gms/FailureDetectorMBean.html#getAllEndpointStates()">getAllEndpointStates</a></code> in interface <code><a href="../../../../org/apache/cassandra/gms/FailureDetectorMBean.html" title="interface in org.apache.cassandra.gms">FailureDetectorMBean</a></code></dd>
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<h4>getSimpleStates</h4>
<pre>public java.util.Map<java.lang.String,java.lang.String> getSimpleStates()</pre>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../org/apache/cassandra/gms/FailureDetectorMBean.html#getSimpleStates()">getSimpleStates</a></code> in interface <code><a href="../../../../org/apache/cassandra/gms/FailureDetectorMBean.html" title="interface in org.apache.cassandra.gms">FailureDetectorMBean</a></code></dd>
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<a name="getDownEndpointCount()">
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<h4>getDownEndpointCount</h4>
<pre>public int getDownEndpointCount()</pre>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../org/apache/cassandra/gms/FailureDetectorMBean.html#getDownEndpointCount()">getDownEndpointCount</a></code> in interface <code><a href="../../../../org/apache/cassandra/gms/FailureDetectorMBean.html" title="interface in org.apache.cassandra.gms">FailureDetectorMBean</a></code></dd>
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<h4>getUpEndpointCount</h4>
<pre>public int getUpEndpointCount()</pre>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../org/apache/cassandra/gms/FailureDetectorMBean.html#getUpEndpointCount()">getUpEndpointCount</a></code> in interface <code><a href="../../../../org/apache/cassandra/gms/FailureDetectorMBean.html" title="interface in org.apache.cassandra.gms">FailureDetectorMBean</a></code></dd>
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<h4>getEndpointState</h4>
<pre>public java.lang.String getEndpointState(java.lang.String address)
throws java.net.UnknownHostException</pre>
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<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../org/apache/cassandra/gms/FailureDetectorMBean.html#getEndpointState(java.lang.String)">getEndpointState</a></code> in interface <code><a href="../../../../org/apache/cassandra/gms/FailureDetectorMBean.html" title="interface in org.apache.cassandra.gms">FailureDetectorMBean</a></code></dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.net.UnknownHostException</code></dd></dl>
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<h4>dumpInterArrivalTimes</h4>
<pre>public void dumpInterArrivalTimes()</pre>
<div class="block">Dump the inter arrival times for examination if necessary.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../org/apache/cassandra/gms/FailureDetectorMBean.html#dumpInterArrivalTimes()">dumpInterArrivalTimes</a></code> in interface <code><a href="../../../../org/apache/cassandra/gms/FailureDetectorMBean.html" title="interface in org.apache.cassandra.gms">FailureDetectorMBean</a></code></dd>
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<h4>setPhiConvictThreshold</h4>
<pre>public void setPhiConvictThreshold(double phi)</pre>
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<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../org/apache/cassandra/gms/FailureDetectorMBean.html#setPhiConvictThreshold(double)">setPhiConvictThreshold</a></code> in interface <code><a href="../../../../org/apache/cassandra/gms/FailureDetectorMBean.html" title="interface in org.apache.cassandra.gms">FailureDetectorMBean</a></code></dd>
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<h4>getPhiConvictThreshold</h4>
<pre>public double getPhiConvictThreshold()</pre>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../org/apache/cassandra/gms/FailureDetectorMBean.html#getPhiConvictThreshold()">getPhiConvictThreshold</a></code> in interface <code><a href="../../../../org/apache/cassandra/gms/FailureDetectorMBean.html" title="interface in org.apache.cassandra.gms">FailureDetectorMBean</a></code></dd>
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<h4>isAlive</h4>
<pre>public boolean isAlive(java.net.InetAddress ep)</pre>
<div class="block"><strong>Description copied from interface: <code><a href="../../../../org/apache/cassandra/gms/IFailureDetector.html#isAlive(java.net.InetAddress)">IFailureDetector</a></code></strong></div>
<div class="block">Failure Detector's knowledge of whether a node is up or
down.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../org/apache/cassandra/gms/IFailureDetector.html#isAlive(java.net.InetAddress)">isAlive</a></code> in interface <code><a href="../../../../org/apache/cassandra/gms/IFailureDetector.html" title="interface in org.apache.cassandra.gms">IFailureDetector</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>ep</code> - endpoint in question.</dd>
<dt><span class="strong">Returns:</span></dt><dd>true if UP and false if DOWN.</dd></dl>
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<a name="report(java.net.InetAddress)">
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<h4>report</h4>
<pre>public void report(java.net.InetAddress ep)</pre>
<div class="block"><strong>Description copied from interface: <code><a href="../../../../org/apache/cassandra/gms/IFailureDetector.html#report(java.net.InetAddress)">IFailureDetector</a></code></strong></div>
<div class="block">This method is invoked by the receiver of the heartbeat. In our case it would be
the Gossiper. Gossiper inform the Failure Detector on receipt of a heartbeat. The
FailureDetector will then sample the arrival time as explained in the paper.
<p/>
param ep endpoint being reported.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../org/apache/cassandra/gms/IFailureDetector.html#report(java.net.InetAddress)">report</a></code> in interface <code><a href="../../../../org/apache/cassandra/gms/IFailureDetector.html" title="interface in org.apache.cassandra.gms">IFailureDetector</a></code></dd>
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<h4>interpret</h4>
<pre>public void interpret(java.net.InetAddress ep)</pre>
<div class="block"><strong>Description copied from interface: <code><a href="../../../../org/apache/cassandra/gms/IFailureDetector.html#interpret(java.net.InetAddress)">IFailureDetector</a></code></strong></div>
<div class="block">This method is invoked by any entity wanting to interrogate the status of an endpoint.
In our case it would be the Gossiper. The Failure Detector will then calculate Phi and
deem an endpoint as suspicious or alive as explained in the Hayashibara paper.
<p/>
param ep endpoint for which we interpret the inter arrival times.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../org/apache/cassandra/gms/IFailureDetector.html#interpret(java.net.InetAddress)">interpret</a></code> in interface <code><a href="../../../../org/apache/cassandra/gms/IFailureDetector.html" title="interface in org.apache.cassandra.gms">IFailureDetector</a></code></dd>
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<h4>forceConviction</h4>
<pre>public void forceConviction(java.net.InetAddress ep)</pre>
<div class="block"><strong>Description copied from interface: <code><a href="../../../../org/apache/cassandra/gms/IFailureDetector.html#forceConviction(java.net.InetAddress)">IFailureDetector</a></code></strong></div>
<div class="block">force conviction of endpoint in the failure detector</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../org/apache/cassandra/gms/IFailureDetector.html#forceConviction(java.net.InetAddress)">forceConviction</a></code> in interface <code><a href="../../../../org/apache/cassandra/gms/IFailureDetector.html" title="interface in org.apache.cassandra.gms">IFailureDetector</a></code></dd>
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<h4>remove</h4>
<pre>public void remove(java.net.InetAddress ep)</pre>
<div class="block"><strong>Description copied from interface: <code><a href="../../../../org/apache/cassandra/gms/IFailureDetector.html#remove(java.net.InetAddress)">IFailureDetector</a></code></strong></div>
<div class="block">remove endpoint from failure detector</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../org/apache/cassandra/gms/IFailureDetector.html#remove(java.net.InetAddress)">remove</a></code> in interface <code><a href="../../../../org/apache/cassandra/gms/IFailureDetector.html" title="interface in org.apache.cassandra.gms">IFailureDetector</a></code></dd>
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<a name="registerFailureDetectionEventListener(org.apache.cassandra.gms.IFailureDetectionEventListener)">
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<h4>registerFailureDetectionEventListener</h4>
<pre>public void registerFailureDetectionEventListener(<a href="../../../../org/apache/cassandra/gms/IFailureDetectionEventListener.html" title="interface in org.apache.cassandra.gms">IFailureDetectionEventListener</a> listener)</pre>
<div class="block"><strong>Description copied from interface: <code><a href="../../../../org/apache/cassandra/gms/IFailureDetector.html#registerFailureDetectionEventListener(org.apache.cassandra.gms.IFailureDetectionEventListener)">IFailureDetector</a></code></strong></div>
<div class="block">Register interest for Failure Detector events.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../org/apache/cassandra/gms/IFailureDetector.html#registerFailureDetectionEventListener(org.apache.cassandra.gms.IFailureDetectionEventListener)">registerFailureDetectionEventListener</a></code> in interface <code><a href="../../../../org/apache/cassandra/gms/IFailureDetector.html" title="interface in org.apache.cassandra.gms">IFailureDetector</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>listener</code> - implementation of an application provided IFailureDetectionEventListener</dd></dl>
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<h4>unregisterFailureDetectionEventListener</h4>
<pre>public void unregisterFailureDetectionEventListener(<a href="../../../../org/apache/cassandra/gms/IFailureDetectionEventListener.html" title="interface in org.apache.cassandra.gms">IFailureDetectionEventListener</a> listener)</pre>
<div class="block"><strong>Description copied from interface: <code><a href="../../../../org/apache/cassandra/gms/IFailureDetector.html#unregisterFailureDetectionEventListener(org.apache.cassandra.gms.IFailureDetectionEventListener)">IFailureDetector</a></code></strong></div>
<div class="block">Un-register interest for Failure Detector events.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../org/apache/cassandra/gms/IFailureDetector.html#unregisterFailureDetectionEventListener(org.apache.cassandra.gms.IFailureDetectionEventListener)">unregisterFailureDetectionEventListener</a></code> in interface <code><a href="../../../../org/apache/cassandra/gms/IFailureDetector.html" title="interface in org.apache.cassandra.gms">IFailureDetector</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>listener</code> - implementation of an application provided IFailureDetectionEventListener</dd></dl>
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<h4>toString</h4>
<pre>public java.lang.String toString()</pre>
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<dt><strong>Overrides:</strong></dt>
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<h4>main</h4>
<pre>public static void main(java.lang.String[] args)</pre>
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