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| <div class="subTitle">org.apache.ignite.igfs.mapreduce</div> |
| <h2 title="Class IgfsTask" class="title">Class IgfsTask<span class='angle_bracket'><</span>T,R<span class='angle_bracket'>></span></h2> |
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| <li><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li><a href="../../../../../org/apache/ignite/compute/ComputeTaskAdapter.html" title="class in org.apache.ignite.compute">org.apache.ignite.compute.ComputeTaskAdapter</a><span class='angle_bracket'><</span><a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsTaskArgs.html" title="interface in org.apache.ignite.igfs.mapreduce">IgfsTaskArgs</a><span class='angle_bracket'><</span>T<span class='angle_bracket'>></span>,R<span class='angle_bracket'>></span></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.ignite.igfs.mapreduce.IgfsTask<span class='angle_bracket'><</span>T,R<span class='angle_bracket'>></span></li> |
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| </dl> |
| <dl> |
| <dt>Direct Known Subclasses:</dt> |
| <dd><a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsTaskNoReduceAdapter.html" title="class in org.apache.ignite.igfs.mapreduce">IgfsTaskNoReduceAdapter</a></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>public abstract class <span class="strong">IgfsTask<span class='angle_bracket'><</span>T,R<span class='angle_bracket'>></span></span> |
| extends <a href="../../../../../org/apache/ignite/compute/ComputeTaskAdapter.html" title="class in org.apache.ignite.compute">ComputeTaskAdapter</a><span class='angle_bracket'><</span><a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsTaskArgs.html" title="interface in org.apache.ignite.igfs.mapreduce">IgfsTaskArgs</a><span class='angle_bracket'><</span>T<span class='angle_bracket'>></span>,R<span class='angle_bracket'>></span></pre> |
| <div class="block">IGFS task which can be executed on the grid using one of <code>IgniteFs.execute()</code> methods. Essentially IGFS task |
| is regular <a href="../../../../../org/apache/ignite/compute/ComputeTask.html" title="interface in org.apache.ignite.compute"><code>ComputeTask</code></a> with different map logic. Instead of implementing |
| <a href="../../../../../org/apache/ignite/compute/ComputeTask.html#map(java.util.List, T)"><code>ComputeTask.map(List, Object)</code></a> method to split task into jobs, you must implement |
| <a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsTask.html#createJob(org.apache.ignite.igfs.IgfsPath, org.apache.ignite.igfs.mapreduce.IgfsFileRange, org.apache.ignite.igfs.mapreduce.IgfsTaskArgs)"><code>createJob(org.apache.ignite.igfs.IgfsPath, IgfsFileRange, IgfsTaskArgs)</code></a> method. |
| <p> |
| Each file participating in IGFS task is split into <a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsFileRange.html" title="class in org.apache.ignite.igfs.mapreduce"><code>IgfsFileRange</code></a>s first. Normally range is a number of |
| consequent bytes located on a single node (see <code>IgfssGroupDataBlocksKeyMapper</code>). In case maximum range size |
| is provided (either through <a href="../../../../../org/apache/ignite/configuration/FileSystemConfiguration.html#getMaximumTaskRangeLength()"><code>FileSystemConfiguration.getMaximumTaskRangeLength()</code></a> or <code>IgniteFs.execute()</code> |
| argument), then ranges could be further divided into smaller chunks. |
| <p> |
| Once file is split into ranges, each range is passed to <code>IgfsTask.createJob()</code> method in order to create a |
| <a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsJob.html" title="interface in org.apache.ignite.igfs.mapreduce"><code>IgfsJob</code></a>. |
| <p> |
| Finally all generated jobs are sent to Grid nodes for execution. |
| <p> |
| As with regular <code>GridComputeTask</code> you can define your own logic for results handling and reduce step. |
| <p> |
| Here is an example of such a task: |
| <pre name="code" class="java"> |
| public class WordCountTask extends IgfsTask<String, Integer> { |
| @Override |
| public IgfsJob createJob(IgfsPath path, IgfsFileRange range, IgfsTaskArgs<T> args) throws IgniteCheckedException { |
| // New job will be created for each range within each file. |
| // We pass user-provided argument (which is essentially a word to look for) to that job. |
| return new WordCountJob(args.userArgument()); |
| } |
| |
| // Aggregate results into one compound result. |
| public Integer reduce(List<GridComputeJobResult> results) throws IgniteCheckedException { |
| Integer total = 0; |
| |
| for (GridComputeJobResult res : results) { |
| Integer cnt = res.getData(); |
| |
| // Null can be returned for non-existent file in case we decide to ignore such situations. |
| if (cnt != null) |
| total += cnt; |
| } |
| |
| return total; |
| } |
| } |
| </pre></div> |
| <dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../serialized-form.html#org.apache.ignite.igfs.mapreduce.IgfsTask">Serialized Form</a></dd></dl> |
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| <td class="colOne"><code><strong><a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsTask.html#IgfsTask()">IgfsTask</a></strong>()</code> </td> |
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| <td class="colFirst"><code>abstract <a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsJob.html" title="interface in org.apache.ignite.igfs.mapreduce">IgfsJob</a></code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsTask.html#createJob(org.apache.ignite.igfs.IgfsPath, org.apache.ignite.igfs.mapreduce.IgfsFileRange, org.apache.ignite.igfs.mapreduce.IgfsTaskArgs)">createJob</a></strong>(<a href="../../../../../org/apache/ignite/igfs/IgfsPath.html" title="class in org.apache.ignite.igfs">IgfsPath</a> path, |
| <a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsFileRange.html" title="class in org.apache.ignite.igfs.mapreduce">IgfsFileRange</a> range, |
| <a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsTaskArgs.html" title="interface in org.apache.ignite.igfs.mapreduce">IgfsTaskArgs</a><span class='angle_bracket'><</span><a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsTask.html" title="type parameter in IgfsTask">T</a><span class='angle_bracket'>></span> args)</code> |
| <div class="block">Callback invoked during task map procedure to create job that will process specified split |
| for IGFS file.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><span class='angle_bracket'><</span>? extends <a href="../../../../../org/apache/ignite/compute/ComputeJob.html" title="interface in org.apache.ignite.compute">ComputeJob</a>,<a href="../../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a><span class='angle_bracket'>></span></code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsTask.html#map(java.util.List, org.apache.ignite.igfs.mapreduce.IgfsTaskArgs)">map</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><span class='angle_bracket'><</span><a href="../../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a><span class='angle_bracket'>></span> subgrid, |
| <a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsTaskArgs.html" title="interface in org.apache.ignite.igfs.mapreduce">IgfsTaskArgs</a><span class='angle_bracket'><</span><a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsTask.html" title="type parameter in IgfsTask">T</a><span class='angle_bracket'>></span> args)</code> |
| <div class="block">This method is called to map or split grid task into multiple grid jobs.</div> |
| </td> |
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| <h3>Methods inherited from class org.apache.ignite.compute.<a href="../../../../../org/apache/ignite/compute/ComputeTaskAdapter.html" title="class in org.apache.ignite.compute">ComputeTaskAdapter</a></h3> |
| <code><a href="../../../../../org/apache/ignite/compute/ComputeTaskAdapter.html#result(org.apache.ignite.compute.ComputeJobResult, java.util.List)">result</a></code></li> |
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| <code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/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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| </a> |
| <h3>Methods inherited from interface org.apache.ignite.compute.<a href="../../../../../org/apache/ignite/compute/ComputeTask.html" title="interface in org.apache.ignite.compute">ComputeTask</a></h3> |
| <code><a href="../../../../../org/apache/ignite/compute/ComputeTask.html#reduce(java.util.List)">reduce</a></code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
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| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
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| <h3>Constructor Detail</h3> |
| <a name="IgfsTask()"> |
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| <h4>IgfsTask</h4> |
| <pre>public IgfsTask()</pre> |
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| <a name="map(java.util.List, org.apache.ignite.igfs.mapreduce.IgfsTaskArgs)"> |
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| <h4>map</h4> |
| <pre>@Nullable |
| public final <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><span class='angle_bracket'><</span>? extends <a href="../../../../../org/apache/ignite/compute/ComputeJob.html" title="interface in org.apache.ignite.compute">ComputeJob</a>,<a href="../../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a><span class='angle_bracket'>></span> map(<a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><span class='angle_bracket'><</span><a href="../../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a><span class='angle_bracket'>></span> subgrid, |
| @Nullable |
| <a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsTaskArgs.html" title="interface in org.apache.ignite.igfs.mapreduce">IgfsTaskArgs</a><span class='angle_bracket'><</span><a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsTask.html" title="type parameter in IgfsTask">T</a><span class='angle_bracket'>></span> args)</pre> |
| <div class="block">This method is called to map or split grid task into multiple grid jobs. This is the |
| first method that gets called when task execution starts.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>subgrid</code> - Nodes available for this task execution. Note that order of nodes is |
| guaranteed to be randomized by container. This ensures that every time |
| you simply iterate through grid nodes, the order of nodes will be random which |
| over time should result into all nodes being used equally.</dd><dd><code>args</code> - Task execution argument. Can be <code>null</code>. This is the same argument |
| as the one passed into <code>Grid#execute(...)</code> methods.</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>Map of grid jobs assigned to subgrid node. Unless <a href="../../../../../org/apache/ignite/compute/ComputeTaskContinuousMapper.html" title="interface in org.apache.ignite.compute"><code>ComputeTaskContinuousMapper</code></a> is |
| injected into task, if <code>null</code> or empty map is returned, exception will be thrown.</dd></dl> |
| </li> |
| </ul> |
| <a name="createJob(org.apache.ignite.igfs.IgfsPath, org.apache.ignite.igfs.mapreduce.IgfsFileRange, org.apache.ignite.igfs.mapreduce.IgfsTaskArgs)"> |
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| <h4>createJob</h4> |
| <pre>@Nullable |
| public abstract <a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsJob.html" title="interface in org.apache.ignite.igfs.mapreduce">IgfsJob</a> createJob(<a href="../../../../../org/apache/ignite/igfs/IgfsPath.html" title="class in org.apache.ignite.igfs">IgfsPath</a> path, |
| <a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsFileRange.html" title="class in org.apache.ignite.igfs.mapreduce">IgfsFileRange</a> range, |
| <a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsTaskArgs.html" title="interface in org.apache.ignite.igfs.mapreduce">IgfsTaskArgs</a><span class='angle_bracket'><</span><a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsTask.html" title="type parameter in IgfsTask">T</a><span class='angle_bracket'>></span> args) |
| throws <a href="../../../../../org/apache/ignite/IgniteException.html" title="class in org.apache.ignite">IgniteException</a></pre> |
| <div class="block">Callback invoked during task map procedure to create job that will process specified split |
| for IGFS file.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>path</code> - Path.</dd><dd><code>range</code> - File range based on consecutive blocks. This range will be further |
| realigned to record boundaries on destination node.</dd><dd><code>args</code> - Task argument.</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>IGFS job. If <code>null</code> is returned, the passed in file range will be skipped.</dd> |
| <dt><span class="strong">Throws:</span></dt> |
| <dd><code><a href="../../../../../org/apache/ignite/IgniteException.html" title="class in org.apache.ignite">IgniteException</a></code> - If job creation failed.</dd></dl> |
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| <p class="legalCopy"><small><table width="100%" border="0" cellspacing=0 cellpadding=0 style="padding: 5px"> <tr> <td> <table style="padding-left: 0; margin: 0"> <tbody style="padding: 0; margin: 0"> <tr style="padding: 0; margin: 0"> <td> <a target=_blank href="https://incubator.apache.org/projects/ignite.html"><nobr>2015 Copyright © Apache Software Foundation</nobr></a> </td> </tr> </tbody> </table> </td> <td width="100%" align="right" valign="center"> <a href="https://twitter.com/ApacheIgnite" class="twitter-follow-button" data-show-count="false" data-size="large">Follow @ApacheIgnite</a> <script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+'://platform.twitter.com/widgets.js';fjs.parentNode.insertBefore(js,fjs);}}(document, 'script', 'twitter-wjs');</script> </td> </tr> <tr> <td colspan="2" valign="top" align="left"> <table style="padding-left: 0; margin: 0"> <tbody style="padding: 0; margin: 0"> <tr style="padding: 0; margin: 0"> <td> <b>Apache Ignite Fabric</b> </td> <td>: ver. <strong>1.0.0-RC3</strong> </td> </tr> <tr style="padding: 0; margin: 0"> <td> <b>Release Date</b> </td> <td>: March 24 2015 </td> </tr> </tbody> </table> </td> </tr> </table></small></p> |
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