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Posted to issues@spark.apache.org by "Michael Armbrust (JIRA)" <ji...@apache.org> on 2014/11/14 20:45:34 UTC

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

Michael Armbrust created SPARK-4410:
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             Summary: 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


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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