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Posted to issues@impala.apache.org by "Tim Armstrong (JIRA)" <ji...@apache.org> on 2018/07/03 00:06:00 UTC

[jira] [Created] (IMPALA-7239) Mitigate ParseSmaps() overhead

Tim Armstrong created IMPALA-7239:
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             Summary: Mitigate ParseSmaps() overhead
                 Key: IMPALA-7239
                 URL: https://issues.apache.org/jira/browse/IMPALA-7239
             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


I've heard anecdotes of high system time spent in functions related this the smap parsing. It appears that this can be expensive on systems once the impalad virtual memory gets fragmented and there are 10s of thousands of maps.

We can try to mitigate by reducing frequency of the parsing or disabling it entirely. I'm not sure if there are cheaper ways to get all of the same metrics.



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