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Posted to issues-all@impala.apache.org by "Tim Armstrong (JIRA)" <ji...@apache.org> on 2018/09/24 18:16:00 UTC

[jira] [Updated] (IMPALA-7551) Inaccurate timeline for "Rows Available"

     [ https://issues.apache.org/jira/browse/IMPALA-7551?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tim Armstrong updated IMPALA-7551:
----------------------------------
    Summary: Inaccurate timeline for "Rows Available"   (was: Inaccurate timeline for "Row Available" )

> Inaccurate timeline for "Rows Available" 
> -----------------------------------------
>
>                 Key: IMPALA-7551
>                 URL: https://issues.apache.org/jira/browse/IMPALA-7551
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Backend
>    Affects Versions: Impala 3.1.0
>            Reporter: Pooja Nilangekar
>            Priority: Major
>              Labels: query-lifecycle
>
> While debugging IMPALA-6932, it was noticed that the "Rows Available" metric in the query profile was a short duration (~ 1 second) for a long running limit 1 query (~ 1 hour).
> Currently, it tracks when Open() from the top-most node in the plan returns, not when the first row is actually produced. This can be misleading. A better timeline would be to return true when the first non-empty batch was added to the PlanRootSink. 



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