[jira] [Resolved] (IMPALA-7731) Add ratio between scanned and transmitted bytes to fragment instances

["Lars Volker (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-7731?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lars Volker resolved IMPALA-7731.
---------------------------------
    Resolution: Fixed

> Add ratio between scanned and transmitted bytes to fragment instances
> ---------------------------------------------------------------------
>
>                 Key: IMPALA-7731
>                 URL: https://issues.apache.org/jira/browse/IMPALA-7731
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Backend
>    Affects Versions: Impala 3.1.0
>            Reporter: Lars Volker
>            Assignee: Lars Volker
>            Priority: Major
>              Labels: observability, supportability
>         Attachments: Selective Scan Slowdowns.png
>
>
> Selective scans (and by extension selective fragment instances) take higher performance hits when reading data remotely. They can be identified by a low ratio between data being transmitted vs data being read from HDFS. To make it easier to spot those instances we should add this ratio to each instance and to the root of the execution profile.
>  !Selective Scan Slowdowns.png! 



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