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Posted to issues@flink.apache.org by "Zhu Zhu (Jira)" <ji...@apache.org> on 2021/03/17 04:17:00 UTC

[jira] [Assigned] (FLINK-21777) Replace the 4M data writing cache of sort-merge shuffle with writev system call

     [ https://issues.apache.org/jira/browse/FLINK-21777?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zhu Zhu reassigned FLINK-21777:
-------------------------------

    Assignee: Yingjie Cao

> Replace the 4M data writing cache of sort-merge shuffle with writev system call
> -------------------------------------------------------------------------------
>
>                 Key: FLINK-21777
>                 URL: https://issues.apache.org/jira/browse/FLINK-21777
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Runtime / Network
>    Affects Versions: 1.12.0
>            Reporter: Yingjie Cao
>            Assignee: Yingjie Cao
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.13.0
>
>
> Currently, the sort-merge shuffle implementation uses 4M unmanaged direct memory as cache for data writing. It can be replaced by the writev system call which can reduce the unmanaged direct memory usage without any performance loss.



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