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-        <h1>GroupByPartitioner</h1><h3><span class="morelinks"><div>Related 
Doc:
-            <a href="package.html" class="extype" 
name="org.apache.gearpump.streaming.dsl.partitioner">package partitioner</a>
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-      <span class="modifier_kind">
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class="tparams">[<span name="T">T</span>, <span 
name="GROUP">GROUP</span>]</span><span class="result"> extends <a 
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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">
-          <span class="toggle">Linear Supertypes</span>
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class="params">(<span name="fn">fn: (<span class="extype" 
name="org.apache.gearpump.streaming.dsl.partitioner.GroupByPartitioner.T">T</span>)
 ⇒ <span class="extype" 
name="org.apache.gearpump.streaming.dsl.partitioner.GroupByPartitioner.GROUP">GROUP</span></span>)</span>
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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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cmt"><p>Gets the SINGLE downstream processor task index to send message to.
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http://git-wip-us.apache.org/repos/asf/incubator-gearpump-site/blob/f2a69d38/content/releases/latest/api/scala/org/apache/gearpump/streaming/dsl/partitioner/package.html
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name="T">T</span>, <span name="GROUP">GROUP</span>]</span><span class="result"> 
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-      <p class="shortcomment cmt">Partition messages by applying group by 
function first.</p><div class="fullcomment"><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>
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