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https://issues.apache.org/jira/browse/IMPALA-7731?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gabor Kaszab updated IMPALA-7731:
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Fix Version/s: Impala 3.2.0
> 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
> Fix For: Impala 3.2.0
>
> 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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