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

["Bikramjeet Vig (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-6852?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bikramjeet Vig reassigned IMPALA-6852:
--------------------------------------

    Assignee: Alice Fan

> 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: Alice Fan
>            Priority: Major
>              Labels: ramp-up, supportability
>
> 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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