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Posted to issues-all@impala.apache.org by "Tim Armstrong (JIRA)" <ji...@apache.org> on 2018/08/14 23:27:00 UTC

[jira] [Created] (IMPALA-7446) Queries can spill earlier than necessary because of accumulation of free buffers and clean pages

Tim Armstrong created IMPALA-7446:
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             Summary: Queries can spill earlier than necessary because of accumulation of free buffers and clean pages
                 Key: IMPALA-7446
                 URL: https://issues.apache.org/jira/browse/IMPALA-7446
             Project: IMPALA
          Issue Type: Bug
          Components: Backend
    Affects Versions: Impala 2.12.0, Impala 3.0, Impala 2.11.0, Impala 2.10.0
            Reporter: Tim Armstrong
            Assignee: Tim Armstrong


See IMPALA-7442 for an example where the query started to spill even when memory could have been made available by freeing buffers or evicting clean pages. Usually this would just result in spilling earlier than necessary, but in the case of IMPALA-7442 it lead to a query failure.

My original intent was that BufferPool::ReleaseMemory() should be called in situations like this, but that was not done.



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