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Posted to issues@impala.apache.org by "Tim Armstrong (Jira)" <ji...@apache.org> on 2020/12/23 18:03:00 UTC

[jira] [Resolved] (IMPALA-8006) Consider replacing the modulus in KrpcDatastreamSender with fast mod

     [ https://issues.apache.org/jira/browse/IMPALA-8006?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tim Armstrong resolved IMPALA-8006.
-----------------------------------
    Resolution: Won't Do

Per Norbert's comment, this likely isn't high impact.

> Consider replacing the modulus in KrpcDatastreamSender with fast mod 
> ---------------------------------------------------------------------
>
>                 Key: IMPALA-8006
>                 URL: https://issues.apache.org/jira/browse/IMPALA-8006
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Distributed Exec
>    Affects Versions: Impala 3.1.0
>            Reporter: Michael Ho
>            Priority: Major
>              Labels: ramp-up
>
> [~tlipcon]  pointed out that there is potential improvement which can be implemented for the modulus used in our sender for the partitioning exchanges: 
> http://www.idryman.org/blog/2017/05/03/writing-a-damn-fast-hash-table-with-tiny-memory-footprints/ (Optimizing Division for Hash Table Size).
> We should evaluate its effectiveness and implement it for KrpcDataStreamSender if appropriate.



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