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<h1>GroupByPartitioner</h1><h3><span class="morelinks"><div>Related Doc:
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<span class="name">GroupByPartitioner</span><span class="tparams">[<span name="T">T</span>, <span name="GROUP">GROUP</span>]</span><span class="result"> extends <a href="../../partitioner/UnicastPartitioner.html" class="extype" name="org.apache.gearpump.streaming.partitioner.UnicastPartitioner">UnicastPartitioner</a></span>
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<div id="comment" class="fullcommenttop"><div class="comment cmt"><p>Partition messages by applying group by function first.</p><p>For example:</p><pre><span class="kw">case</span> <span class="kw">class</span> People(name: <span class="std">String</span>, gender: <span class="std">String</span>)
<span class="kw">object</span> Test{
<span class="kw">val</span> groupBy: (People <span class="kw">=&gt;</span> <span class="std">String</span>) = people <span class="kw">=&gt;</span> people.gender
<span class="kw">val</span> partitioner = GroupByPartitioner(groupBy)
}</pre></div><div class="toggleContainer block">
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<p class="shortcomment cmt"></p><div class="fullcomment"><div class="comment cmt"></div><dl class="paramcmts block"><dt class="param">fn</dt><dd class="cmt"><p>First apply message with groupBy function, then pick the hashCode of the output
to do the partitioning. You must define hashCode() for output type of groupBy function.</p></dd></dl></div>
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<p class="shortcomment cmt">Gets the SINGLE downstream processor task index to send message to.</p><div class="fullcomment"><div class="comment cmt"><p>Gets the SINGLE downstream processor task index to send message to.
</p></div><dl class="paramcmts block"><dt class="param">partitionNum</dt><dd class="cmt"><p>How many tasks does the downstream processor have.</p></dd><dt>returns</dt><dd class="cmt"><p>ONE task index of downstream processor.</p></dd></dl><dl class="attributes block"> <dt>Definition Classes</dt><dd><a href="" class="extype" name="org.apache.gearpump.streaming.dsl.partitioner.GroupByPartitioner">GroupByPartitioner</a><a href="../../partitioner/UnicastPartitioner.html" class="extype" name="org.apache.gearpump.streaming.partitioner.UnicastPartitioner">UnicastPartitioner</a></dd></dl></div>
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