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Posted to issues@spark.apache.org by "Michael Armbrust (JIRA)" <ji...@apache.org> on 2014/11/19 20:05:34 UTC

[jira] [Resolved] (SPARK-4410) Support for external sort

     [ https://issues.apache.org/jira/browse/SPARK-4410?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Armbrust resolved SPARK-4410.
-------------------------------------
          Resolution: Fixed
       Fix Version/s: 1.2.0
    Target Version/s: 1.2.0

> Support for external sort
> -------------------------
>
>                 Key: SPARK-4410
>                 URL: https://issues.apache.org/jira/browse/SPARK-4410
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Michael Armbrust
>            Assignee: Michael Armbrust
>            Priority: Critical
>             Fix For: 1.2.0
>
>
> When any given key is of too high cardinality the current sorting code can tip over (since it loads a whole partition into memory).  I propose we add optional support for using sparks built in external sorting mechanism.  It can be off by default, but if we determine this code path does not regress performance we can turn it on by default in the future.



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