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<div class="subTitle">org.apache.hadoop.mapred</div>
<h2 title="Class ClusterStatus" class="title">Class ClusterStatus</h2>
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<li>org.apache.hadoop.mapred.ClusterStatus</li>
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<pre>@InterfaceAudience.Public
@InterfaceStability.Stable
public class <span class="typeNameLabel">ClusterStatus</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/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</a></pre>
<div class="block">Status information on the current state of the Map-Reduce cluster.
<p><code>ClusterStatus</code> provides clients with information such as:
<ol>
<li>
Size of the cluster.
</li>
<li>
Name of the trackers.
</li>
<li>
Task capacity of the cluster.
</li>
<li>
The number of currently running map and reduce tasks.
</li>
<li>
State of the <code>JobTracker</code>.
</li>
<li>
Details regarding black listed trackers.
</li>
</ol>
<p>Clients can query for the latest <code>ClusterStatus</code>, via
<a href="../../../../org/apache/hadoop/mapred/JobClient.html#getClusterStatus--"><code>JobClient.getClusterStatus()</code></a>.</p></div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../org/apache/hadoop/mapred/JobClient.html" title="class in org.apache.hadoop.mapred"><code>JobClient</code></a></dd>
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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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<tr class="altColor">
<td class="colFirst"><code>static long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/ClusterStatus.html#UNINITIALIZED_MEMORY_VALUE">UNINITIALIZED_MEMORY_VALUE</a></span></code>&nbsp;</td>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</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><span id="t6" class="tableTab"><span><a href="javascript:show(32);">Deprecated 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/Collection.html?is-external=true" title="class or interface in java.util">Collection</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>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/ClusterStatus.html#getActiveTrackerNames--">getActiveTrackerNames</a></span>()</code>
<div class="block">Get the names of task trackers in the cluster.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</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>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/ClusterStatus.html#getBlacklistedTrackerNames--">getBlacklistedTrackerNames</a></span>()</code>
<div class="block">Get the names of task trackers in the cluster.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/ClusterStatus.html#getBlacklistedTrackers--">getBlacklistedTrackers</a></span>()</code>
<div class="block">Get the number of blacklisted task trackers in the cluster.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;org.apache.hadoop.mapred.ClusterStatus.BlackListInfo&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/ClusterStatus.html#getBlackListedTrackersInfo--">getBlackListedTrackersInfo</a></span>()</code>
<div class="block">Gets the list of blacklisted trackers along with reasons for blacklisting.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</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>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/ClusterStatus.html#getGraylistedTrackerNames--">getGraylistedTrackerNames</a></span>()</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/ClusterStatus.html#getGraylistedTrackers--">getGraylistedTrackers</a></span>()</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>org.apache.hadoop.mapred.JobTracker.State</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/ClusterStatus.html#getJobTrackerState--">getJobTrackerState</a></span>()</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>org.apache.hadoop.mapreduce.Cluster.JobTrackerStatus</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/ClusterStatus.html#getJobTrackerStatus--">getJobTrackerStatus</a></span>()</code>
<div class="block">Get the JobTracker's status.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/ClusterStatus.html#getMapTasks--">getMapTasks</a></span>()</code>
<div class="block">Get the number of currently running map tasks in the cluster.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/ClusterStatus.html#getMaxMapTasks--">getMaxMapTasks</a></span>()</code>
<div class="block">Get the maximum capacity for running map tasks in the cluster.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/ClusterStatus.html#getMaxMemory--">getMaxMemory</a></span>()</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/ClusterStatus.html#getMaxReduceTasks--">getMaxReduceTasks</a></span>()</code>
<div class="block">Get the maximum capacity for running reduce tasks in the cluster.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/ClusterStatus.html#getNumExcludedNodes--">getNumExcludedNodes</a></span>()</code>
<div class="block">Get the number of excluded hosts in the cluster.</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/ClusterStatus.html#getReduceTasks--">getReduceTasks</a></span>()</code>
<div class="block">Get the number of currently running reduce tasks in the cluster.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/ClusterStatus.html#getTaskTrackers--">getTaskTrackers</a></span>()</code>
<div class="block">Get the number of task trackers in the cluster.</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/ClusterStatus.html#getTTExpiryInterval--">getTTExpiryInterval</a></span>()</code>
<div class="block">Get the tasktracker expiry interval for the cluster</div>
</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/ClusterStatus.html#getUsedMemory--">getUsedMemory</a></span>()</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/ClusterStatus.html#readFields-java.io.DataInput-">readFields</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</a>&nbsp;in)</code>
<div class="block">Deserialize the fields of this object from <code>in</code>.</div>
</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/ClusterStatus.html#write-java.io.DataOutput-">write</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</a>&nbsp;out)</code>
<div class="block">Serialize the fields of this object to <code>out</code>.</div>
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<h4>UNINITIALIZED_MEMORY_VALUE</h4>
<pre>public static final&nbsp;long UNINITIALIZED_MEMORY_VALUE</pre>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../constant-values.html#org.apache.hadoop.mapred.ClusterStatus.UNINITIALIZED_MEMORY_VALUE">Constant Field Values</a></dd>
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<h4>getTaskTrackers</h4>
<pre>public&nbsp;int&nbsp;getTaskTrackers()</pre>
<div class="block">Get the number of task trackers in the cluster.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the number of task trackers in the cluster.</dd>
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<h4>getActiveTrackerNames</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</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>&gt;&nbsp;getActiveTrackerNames()</pre>
<div class="block">Get the names of task trackers in the cluster.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the active task trackers in the cluster.</dd>
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<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</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>&gt;&nbsp;getBlacklistedTrackerNames()</pre>
<div class="block">Get the names of task trackers in the cluster.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the blacklisted task trackers in the cluster.</dd>
</dl>
</li>
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<h4>getGraylistedTrackerNames</h4>
<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>
public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</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>&gt;&nbsp;getGraylistedTrackerNames()</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
<div class="block">Get the names of graylisted task trackers in the cluster.
The gray list of trackers is no longer available on M/R 2.x. The function
is kept to be compatible with M/R 1.x applications.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an empty graylisted task trackers in the cluster.</dd>
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</li>
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<h4>getGraylistedTrackers</h4>
<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>
public&nbsp;int&nbsp;getGraylistedTrackers()</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
<div class="block">Get the number of graylisted task trackers in the cluster.
The gray list of trackers is no longer available on M/R 2.x. The function
is kept to be compatible with M/R 1.x applications.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>0 graylisted task trackers in the cluster.</dd>
</dl>
</li>
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<pre>public&nbsp;int&nbsp;getBlacklistedTrackers()</pre>
<div class="block">Get the number of blacklisted task trackers in the cluster.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the number of blacklisted task trackers in the cluster.</dd>
</dl>
</li>
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<pre>public&nbsp;int&nbsp;getNumExcludedNodes()</pre>
<div class="block">Get the number of excluded hosts in the cluster.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the number of excluded hosts in the cluster.</dd>
</dl>
</li>
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<h4>getTTExpiryInterval</h4>
<pre>public&nbsp;long&nbsp;getTTExpiryInterval()</pre>
<div class="block">Get the tasktracker expiry interval for the cluster</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the expiry interval in msec</dd>
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<pre>public&nbsp;int&nbsp;getMapTasks()</pre>
<div class="block">Get the number of currently running map tasks in the cluster.</div>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>the number of currently running map tasks in the cluster.</dd>
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<pre>public&nbsp;int&nbsp;getReduceTasks()</pre>
<div class="block">Get the number of currently running reduce tasks in the cluster.</div>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>the number of currently running reduce tasks in the cluster.</dd>
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<pre>public&nbsp;int&nbsp;getMaxMapTasks()</pre>
<div class="block">Get the maximum capacity for running map tasks in the cluster.</div>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>the maximum capacity for running map tasks in the cluster.</dd>
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<pre>public&nbsp;int&nbsp;getMaxReduceTasks()</pre>
<div class="block">Get the maximum capacity for running reduce tasks in the cluster.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the maximum capacity for running reduce tasks in the cluster.</dd>
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<pre>public&nbsp;org.apache.hadoop.mapreduce.Cluster.JobTrackerStatus&nbsp;getJobTrackerStatus()</pre>
<div class="block">Get the JobTracker's status.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>Cluster.JobTrackerStatus</code> of the JobTracker</dd>
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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>
public&nbsp;long&nbsp;getMaxMemory()</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
<div class="block">Returns UNINITIALIZED_MEMORY_VALUE (-1)</div>
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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>
public&nbsp;long&nbsp;getUsedMemory()</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
<div class="block">Returns UNINITIALIZED_MEMORY_VALUE (-1)</div>
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<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;org.apache.hadoop.mapred.ClusterStatus.BlackListInfo&gt;&nbsp;getBlackListedTrackersInfo()</pre>
<div class="block">Gets the list of blacklisted trackers along with reasons for blacklisting.</div>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>the collection of <code>ClusterStatus.BlackListInfo</code> objects.</dd>
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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>
public&nbsp;org.apache.hadoop.mapred.JobTracker.State&nbsp;getJobTrackerState()</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
<div class="block">Get the current state of the <code>JobTracker</code>,
as <code>JobTracker.State</code>
<code>JobTracker.State</code> should no longer be used on M/R 2.x. The function
is kept to be compatible with M/R 1.x applications.</div>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>the invalid state of the <code>JobTracker</code>.</dd>
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<pre>public&nbsp;void&nbsp;write(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</a>&nbsp;out)
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<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/apache/hadoop/io/Writable.html#write-java.io.DataOutput-">Writable</a></code></span></div>
<div class="block">Serialize the fields of this object to <code>out</code>.</div>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/apache/hadoop/io/Writable.html#write-java.io.DataOutput-">write</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>out</code> - <code>DataOuput</code> to serialize this object into.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<pre>public&nbsp;void&nbsp;readFields(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</a>&nbsp;in)
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<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/apache/hadoop/io/Writable.html#readFields-java.io.DataInput-">Writable</a></code></span></div>
<div class="block">Deserialize the fields of this object from <code>in</code>.
<p>For efficiency, implementations should attempt to re-use storage in the
existing object where possible.</p></div>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/apache/hadoop/io/Writable.html#readFields-java.io.DataInput-">readFields</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>in</code> - <code>DataInput</code> to deseriablize this object from.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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