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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