[jira] [Created] (IMPALA-5669) Partial sort node should operate within a memory constraint

["Thomas Tauber-Marshall (JIRA)" <ji...@apache.org>]

Thomas Tauber-Marshall created IMPALA-5669:
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             Summary: Partial sort node should operate within a memory constraint
                 Key: IMPALA-5669
                 URL: https://issues.apache.org/jira/browse/IMPALA-5669
             Project: IMPALA
          Issue Type: Improvement
          Components: Backend
    Affects Versions: Impala 2.10.0
            Reporter: Thomas Tauber-Marshall
            Priority: Critical


A change currently in review, IMPALA-5498, adds a new exec node PartialSortNode. Initially, it will just allocate memory up to the query memory limit, but once the new buffer management work in IMPALA-3200 goes in, it should be modified to operate within a memory constraint.

PartialSortNode can operate with essentially any amount of memory, with the tradeoff that a smaller limit leads to a "lower quality", more random sort. We should investigate the performance implications of different limits, and consider making the limit configurable.



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