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<h2 title="Class TaskContext" class="title">Class TaskContext</h2>
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<li>java.lang.Object</li>
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<pre>public abstract class <span class="strong">TaskContext</span>
extends java.lang.Object
implements java.io.Serializable</pre>
<div class="block">Contextual information about a task which can be read or mutated during
execution. To access the TaskContext for a running task, use:
<pre><code>
org.apache.spark.TaskContext.get()
</code></pre></div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../serialized-form.html#org.apache.spark.TaskContext">Serialized Form</a></dd></dl>
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<td class="colOne"><code><strong><a href="../../../org/apache/spark/TaskContext.html#TaskContext()">TaskContext</a></strong>()</code> </td>
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<td class="colFirst"><code>abstract void</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/TaskContext.html#addOnCompleteCallback(scala.Function0)">addOnCompleteCallback</a></strong>(scala.Function0<scala.runtime.BoxedUnit> f)</code>
<div class="block">Adds a callback function to be executed on task completion.</div>
</td>
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<tr class="rowColor">
<td class="colFirst"><code>abstract <a href="../../../org/apache/spark/TaskContext.html" title="class in org.apache.spark">TaskContext</a></code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/TaskContext.html#addTaskCompletionListener(scala.Function1)">addTaskCompletionListener</a></strong>(scala.Function1<<a href="../../../org/apache/spark/TaskContext.html" title="class in org.apache.spark">TaskContext</a>,scala.runtime.BoxedUnit> f)</code>
<div class="block">Adds a listener in the form of a Scala closure to be executed on task completion.</div>
</td>
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<tr class="altColor">
<td class="colFirst"><code>abstract <a href="../../../org/apache/spark/TaskContext.html" title="class in org.apache.spark">TaskContext</a></code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/TaskContext.html#addTaskCompletionListener(org.apache.spark.util.TaskCompletionListener)">addTaskCompletionListener</a></strong>(<a href="../../../org/apache/spark/util/TaskCompletionListener.html" title="interface in org.apache.spark.util">TaskCompletionListener</a> listener)</code>
<div class="block">Adds a (Java friendly) listener to be executed on task completion.</div>
</td>
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<tr class="rowColor">
<td class="colFirst"><code>abstract long</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/TaskContext.html#attemptId()">attemptId</a></strong>()</code> </td>
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<td class="colFirst"><code>abstract int</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/TaskContext.html#attemptNumber()">attemptNumber</a></strong>()</code>
<div class="block">How many times this task has been attempted.</div>
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<td class="colFirst"><code>static <a href="../../../org/apache/spark/TaskContext.html" title="class in org.apache.spark">TaskContext</a></code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/TaskContext.html#get()">get</a></strong>()</code>
<div class="block">Return the currently active TaskContext.</div>
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<td class="colFirst"><code>abstract scala.collection.Seq<org.apache.spark.metrics.source.Source></code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/TaskContext.html#getMetricsSources(java.lang.String)">getMetricsSources</a></strong>(java.lang.String sourceName)</code>
<div class="block">::DeveloperApi::
Returns all metrics sources with the given name which are associated with the instance
which runs the task.</div>
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<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/TaskContext.html#getPartitionId()">getPartitionId</a></strong>()</code>
<div class="block">Returns the partition id of currently active TaskContext.</div>
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<td class="colFirst"><code>abstract scala.collection.immutable.Map<java.lang.String,<a href="../../../org/apache/spark/Accumulator.html" title="class in org.apache.spark">Accumulator</a><java.lang.Object>></code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/TaskContext.html#internalMetricsToAccumulators()">internalMetricsToAccumulators</a></strong>()</code>
<div class="block">Accumulators for tracking internal metrics indexed by the name.</div>
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<td class="colFirst"><code>abstract boolean</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/TaskContext.html#isCompleted()">isCompleted</a></strong>()</code>
<div class="block">Returns true if the task has completed.</div>
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<td class="colFirst"><code>abstract boolean</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/TaskContext.html#isInterrupted()">isInterrupted</a></strong>()</code>
<div class="block">Returns true if the task has been killed.</div>
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<td class="colFirst"><code>abstract boolean</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/TaskContext.html#isRunningLocally()">isRunningLocally</a></strong>()</code>
<div class="block">Returns true if the task is running locally in the driver program.</div>
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<td class="colFirst"><code>abstract int</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/TaskContext.html#partitionId()">partitionId</a></strong>()</code>
<div class="block">The ID of the RDD partition that is computed by this task.</div>
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<td class="colFirst"><code>abstract boolean</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/TaskContext.html#runningLocally()">runningLocally</a></strong>()</code> </td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected static void</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/TaskContext.html#setTaskContext(org.apache.spark.TaskContext)">setTaskContext</a></strong>(<a href="../../../org/apache/spark/TaskContext.html" title="class in org.apache.spark">TaskContext</a> tc)</code>
<div class="block">Set the thread local TaskContext.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>abstract int</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/TaskContext.html#stageId()">stageId</a></strong>()</code>
<div class="block">The ID of the stage that this task belong to.</div>
</td>
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<tr class="altColor">
<td class="colFirst"><code>abstract long</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/TaskContext.html#taskAttemptId()">taskAttemptId</a></strong>()</code>
<div class="block">An ID that is unique to this task attempt (within the same SparkContext, no two task attempts
will share the same attempt ID).</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>abstract org.apache.spark.executor.TaskMetrics</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/TaskContext.html#taskMetrics()">taskMetrics</a></strong>()</code>
<div class="block">::DeveloperApi::</div>
</td>
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<td class="colFirst"><code>protected static void</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/TaskContext.html#unset()">unset</a></strong>()</code>
<div class="block">Unset the thread local TaskContext.</div>
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<pre>public TaskContext()</pre>
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<pre>public static <a href="../../../org/apache/spark/TaskContext.html" title="class in org.apache.spark">TaskContext</a> get()</pre>
<div class="block">Return the currently active TaskContext. This can be called inside of
user functions to access contextual information about running tasks.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>(undocumented)</dd></dl>
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<pre>public static int getPartitionId()</pre>
<div class="block">Returns the partition id of currently active TaskContext. It will return 0
if there is no active TaskContext for cases like local execution.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>(undocumented)</dd></dl>
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<h4>setTaskContext</h4>
<pre>protected static void setTaskContext(<a href="../../../org/apache/spark/TaskContext.html" title="class in org.apache.spark">TaskContext</a> tc)</pre>
<div class="block">Set the thread local TaskContext. Internal to Spark.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>tc</code> - (undocumented)</dd></dl>
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<h4>unset</h4>
<pre>protected static void unset()</pre>
<div class="block">Unset the thread local TaskContext. Internal to Spark.</div>
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<h4>isCompleted</h4>
<pre>public abstract boolean isCompleted()</pre>
<div class="block">Returns true if the task has completed.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>(undocumented)</dd></dl>
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<pre>public abstract boolean isInterrupted()</pre>
<div class="block">Returns true if the task has been killed.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>(undocumented)</dd></dl>
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<pre>public abstract boolean isRunningLocally()</pre>
<div class="block">Returns true if the task is running locally in the driver program.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd></dd></dl>
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<h4>addTaskCompletionListener</h4>
<pre>public abstract <a href="../../../org/apache/spark/TaskContext.html" title="class in org.apache.spark">TaskContext</a> addTaskCompletionListener(<a href="../../../org/apache/spark/util/TaskCompletionListener.html" title="interface in org.apache.spark.util">TaskCompletionListener</a> listener)</pre>
<div class="block">Adds a (Java friendly) listener to be executed on task completion.
This will be called in all situation - success, failure, or cancellation.
An example use is for HadoopRDD to register a callback to close the input stream.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>listener</code> - (undocumented)</dd>
<dt><span class="strong">Returns:</span></dt><dd>(undocumented)</dd></dl>
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<h4>addTaskCompletionListener</h4>
<pre>public abstract <a href="../../../org/apache/spark/TaskContext.html" title="class in org.apache.spark">TaskContext</a> addTaskCompletionListener(scala.Function1<<a href="../../../org/apache/spark/TaskContext.html" title="class in org.apache.spark">TaskContext</a>,scala.runtime.BoxedUnit> f)</pre>
<div class="block">Adds a listener in the form of a Scala closure to be executed on task completion.
This will be called in all situations - success, failure, or cancellation.
An example use is for HadoopRDD to register a callback to close the input stream.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>f</code> - (undocumented)</dd>
<dt><span class="strong">Returns:</span></dt><dd>(undocumented)</dd></dl>
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<pre>public abstract void addOnCompleteCallback(scala.Function0<scala.runtime.BoxedUnit> f)</pre>
<div class="block">Adds a callback function to be executed on task completion. An example use
is for HadoopRDD to register a callback to close the input stream.
Will be called in any situation - success, failure, or cancellation.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>f</code> - Callback function.</dd></dl>
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<pre>public abstract int stageId()</pre>
<div class="block">The ID of the stage that this task belong to.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>(undocumented)</dd></dl>
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<pre>public abstract int partitionId()</pre>
<div class="block">The ID of the RDD partition that is computed by this task.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>(undocumented)</dd></dl>
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<pre>public abstract int attemptNumber()</pre>
<div class="block">How many times this task has been attempted. The first task attempt will be assigned
attemptNumber = 0, and subsequent attempts will have increasing attempt numbers.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>(undocumented)</dd></dl>
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<pre>public abstract long attemptId()</pre>
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<pre>public abstract long taskAttemptId()</pre>
<div class="block">An ID that is unique to this task attempt (within the same SparkContext, no two task attempts
will share the same attempt ID). This is roughly equivalent to Hadoop's TaskAttemptID.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>(undocumented)</dd></dl>
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<pre>public abstract org.apache.spark.executor.TaskMetrics taskMetrics()</pre>
<div class="block">::DeveloperApi::</div>
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<pre>public abstract scala.collection.Seq<org.apache.spark.metrics.source.Source> getMetricsSources(java.lang.String sourceName)</pre>
<div class="block">::DeveloperApi::
Returns all metrics sources with the given name which are associated with the instance
which runs the task. For more information see <code>org.apache.spark.metrics.MetricsSystem!</code>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>sourceName</code> - (undocumented)</dd>
<dt><span class="strong">Returns:</span></dt><dd>(undocumented)</dd></dl>
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<pre>public abstract scala.collection.immutable.Map<java.lang.String,<a href="../../../org/apache/spark/Accumulator.html" title="class in org.apache.spark">Accumulator</a><java.lang.Object>> internalMetricsToAccumulators()</pre>
<div class="block">Accumulators for tracking internal metrics indexed by the name.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>(undocumented)</dd></dl>
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