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Posted to issues-all@impala.apache.org by "Gabor Kaszab (Jira)" <ji...@apache.org> on 2020/03/24 08:08:00 UTC

[jira] [Assigned] (IMPALA-5669) Partial sort node should have a maximum reservation set by default.

     [ https://issues.apache.org/jira/browse/IMPALA-5669?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gabor Kaszab reassigned IMPALA-5669:
------------------------------------

    Assignee: Adam Tamas

> Partial sort node should have a maximum reservation set by default.
> -------------------------------------------------------------------
>
>                 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
>            Assignee: Adam Tamas
>            Priority: Major
>              Labels: performance, ramp-up, resource-management
>
> 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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