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https://issues.apache.org/jira/browse/SPARK-2574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14072605#comment-14072605
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Matei Zaharia commented on SPARK-2574:
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I implemented this as part of https://github.com/apache/spark/pull/1555
> Avoid allocating new ArrayBuffer in groupByKey's mergeCombiner
> --------------------------------------------------------------
>
> Key: SPARK-2574
> URL: https://issues.apache.org/jira/browse/SPARK-2574
> Project: Spark
> Issue Type: Sub-task
> Components: Spark Core
> Affects Versions: 1.0.0
> Reporter: Sandy Ryza
>
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