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

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

Lars Volker created IMPALA-7731:
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             Summary: Add ration 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
         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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