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https://issues.apache.org/jira/browse/FLINK-21777?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhu Zhu closed FLINK-21777.
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Resolution: Fixed
done via 61bc9429d6afde18711bcc726f077ade5e3b44a8
> 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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