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Posted to issues-all@impala.apache.org by "Tim Armstrong (Jira)" <ji...@apache.org> on 2020/12/21 19:09:00 UTC

[jira] [Updated] (IMPALA-5441) Send larger row batches over the wire

     [ https://issues.apache.org/jira/browse/IMPALA-5441?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tim Armstrong updated IMPALA-5441:
----------------------------------
    Component/s: Perf Investigation

> Send larger row batches over the wire
> -------------------------------------
>
>                 Key: IMPALA-5441
>                 URL: https://issues.apache.org/jira/browse/IMPALA-5441
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Perf Investigation
>    Affects Versions: Impala 2.10.0
>            Reporter: Henry Robinson
>            Priority: Major
>
> Our on-the-wire row batch size is the same as the in-memory size (1024 rows by default). It might make sense to increase the wire-size to reduce the RPC-per-row overhead, and decrease context-switching in the receiver. 
> KRPC makes it quite natural to do that: each row batch can be serialized as a sidecar in memory-size batches. The receiver can then read each batch in turn as though it were sent individually, without any need to stitch together (or split up) serialized batches. 



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