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Posted to issues@impala.apache.org by "Mostafa Mokhtar (JIRA)" <ji...@apache.org> on 2018/04/13 21:03:00 UTC

[jira] [Created] (IMPALA-6852) Add a section to the query profile covering number of fragments and total bytes scanned per host

Mostafa Mokhtar created IMPALA-6852:
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             Summary: Add a section to the query profile covering number of fragments and total bytes scanned per host
                 Key: IMPALA-6852
                 URL: https://issues.apache.org/jira/browse/IMPALA-6852
             Project: IMPALA
          Issue Type: Improvement
          Components: Backend
    Affects Versions: Impala 2.13.0
            Reporter: Mostafa Mokhtar
            Assignee: Sailesh Mukil


Root causing performance issues usually comes down to skew in terms of work done across hosts. Un-even assignment of fragments or bytes scanned per host is a common.
Making this information readily available in the query profile will help speedup RCA.

Proposal is to add two tables to the query profile that cover
* Number of fragments per host
* Number of bytes scanned per host



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