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Posted to issues@beam.apache.org by "Kenneth Knowles (Jira)" <ji...@apache.org> on 2021/02/01 15:05:00 UTC

[jira] [Updated] (BEAM-11730) Reduce context switches for dataflow streaming appliance getdata reads

     [ https://issues.apache.org/jira/browse/BEAM-11730?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kenneth Knowles updated BEAM-11730:
-----------------------------------
    Status: Open  (was: Triage Needed)

> Reduce context switches for dataflow streaming appliance getdata reads
> ----------------------------------------------------------------------
>
>                 Key: BEAM-11730
>                 URL: https://issues.apache.org/jira/browse/BEAM-11730
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-dataflow
>            Reporter: Sam Whittle
>            Assignee: Sam Whittle
>            Priority: P2
>
> Currently reads are batched and issued from a separate thread pool of reading threads.  However in the case that there is not read queuing due to the max # of parallel requests, switching threads is unnecessary and adds additional context swithing overhead.
> In a benchmark I observed 5% cpu spent on LockSupport.park which some googling indicates is due to context switching.



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