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Posted to issues@impala.apache.org by "Andrew Wong (JIRA)" <ji...@apache.org> on 2018/04/06 22:20:00 UTC

[jira] [Created] (IMPALA-6821) Push down limits into Kudu

Andrew Wong created IMPALA-6821:
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             Summary: Push down limits into Kudu
                 Key: IMPALA-6821
                 URL: https://issues.apache.org/jira/browse/IMPALA-6821
             Project: IMPALA
          Issue Type: Improvement
          Components: Clients
            Reporter: Andrew Wong


The progress made in KUDU-16 introduced a way to impose limits on Kudu scanners, potentially reducing the number of RPCs sent per scan, CPU used for scanner evaluation on the tablet server, etc. It would be nice if Impala could make use of this new behavior.

I put up an admittedly clunky [patch|https://gerrit.cloudera.org/c/9923/] that implements limits on a per-token basis. I'm no Impala expert, so there may be an API missing in Kudu that would make Impala's life easier in implementing this. Maybe it's as easy as adjusting the limit after re-hydrating the token into a scanner.



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