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From "Matei Zaharia (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SPARK-983) Support external sorting for RDD#sortByKey()
Date Fri, 01 Aug 2014 07:17:39 GMT

     [ https://issues.apache.org/jira/browse/SPARK-983?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Matei Zaharia resolved SPARK-983.
---------------------------------

       Resolution: Fixed
    Fix Version/s: 1.1.0

> Support external sorting for RDD#sortByKey()
> --------------------------------------------
>
>                 Key: SPARK-983
>                 URL: https://issues.apache.org/jira/browse/SPARK-983
>             Project: Spark
>          Issue Type: New Feature
>          Components: Spark Core
>    Affects Versions: 0.9.0
>            Reporter: Reynold Xin
>            Assignee: Matei Zaharia
>            Priority: Critical
>             Fix For: 1.1.0
>
>
> Currently, RDD#sortByKey() is implemented by a mapPartitions which creates a buffer to
hold the entire partition, then sorts it. This will cause an OOM if an entire partition cannot
fit in memory, which is especially problematic for skewed data. Rather than OOMing, the behavior
should be similar to the [ExternalAppendOnlyMap|https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/util/collection/ExternalAppendOnlyMap.scala],
where we fallback to disk if we detect memory pressure.



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