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<div class="subTitle">org.apache.hadoop.mapreduce</div>
<h2 title="Interface Counter" class="title">Interface Counter</h2>
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<pre>@InterfaceAudience.Public
@InterfaceStability.Stable
public interface <span class="typeNameLabel">Counter</span>
extends <a href="../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</a></pre>
<div class="block">A named counter that tracks the progress of a map/reduce job.
<p><code>Counters</code> represent global counters, defined either by the
Map-Reduce framework or applications. Each <code>Counter</code> is named by
an <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang"><code>Enum</code></a> and has a long for the value.</p>
<p><code>Counters</code> are bunched into Groups, each comprising of
counters from a particular <code>Enum</code> class.</div>
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<td class="colFirst"><code><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/mapreduce/Counter.html#getDisplayName--">getDisplayName</a></span>()</code>
<div class="block">Get the display name of the counter.</div>
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<td class="colFirst"><code><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/mapreduce/Counter.html#getName--">getName</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapreduce/Counter.html#getValue--">getValue</a></span>()</code>
<div class="block">What is the current value of this counter?</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapreduce/Counter.html#increment-long-">increment</a></span>(long&nbsp;incr)</code>
<div class="block">Increment this counter by the given value</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapreduce/Counter.html#setDisplayName-java.lang.String-">setDisplayName</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;displayName)</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;
<div class="block"><span class="deprecationComment">(and no-op by default)</span></div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapreduce/Counter.html#setValue-long-">setValue</a></span>(long&nbsp;value)</code>
<div class="block">Set this counter by the given value</div>
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<code><a href="../../../../org/apache/hadoop/io/Writable.html#readFields-java.io.DataInput-">readFields</a>, <a href="../../../../org/apache/hadoop/io/Writable.html#write-java.io.DataOutput-">write</a></code></li>
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<h4>setDisplayName</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>
void&nbsp;setDisplayName(<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;displayName)</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;<span class="deprecationComment">(and no-op by default)</span></div>
<div class="block">Set the display name of the counter</div>
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<dd><code>displayName</code> - of the counter</dd>
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<h4>getName</h4>
<pre><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;getName()</pre>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>the name of the counter</dd>
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<h4>getDisplayName</h4>
<pre><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;getDisplayName()</pre>
<div class="block">Get the display name of the counter.</div>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>the user facing name of the counter</dd>
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<h4>getValue</h4>
<pre>long&nbsp;getValue()</pre>
<div class="block">What is the current value of this counter?</div>
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<dd>the current value</dd>
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<h4>setValue</h4>
<pre>void&nbsp;setValue(long&nbsp;value)</pre>
<div class="block">Set this counter by the given value</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>value</code> - the value to set</dd>
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<h4>increment</h4>
<pre>void&nbsp;increment(long&nbsp;incr)</pre>
<div class="block">Increment this counter by the given value</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>incr</code> - the value to increase this counter by</dd>
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