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Posted to issues-all@impala.apache.org by "Pooja Nilangekar (JIRA)" <ji...@apache.org> on 2018/09/10 18:49:00 UTC

[jira] [Created] (IMPALA-7551) Inaccurate timeline for "Row Available"

Pooja Nilangekar created IMPALA-7551:
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             Summary: Inaccurate timeline for "Row Available" 
                 Key: IMPALA-7551
                 URL: https://issues.apache.org/jira/browse/IMPALA-7551
             Project: IMPALA
          Issue Type: Improvement
            Reporter: Pooja Nilangekar


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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