Yingjie Cao created FLINK-21777:
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Summary: 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
Fix For: 1.13.0
Currently, the sort-merge shuffle implementation uses 4M unmanned direct memory
as cache for data written. It can be replaced by the writev system call which
can reduce the unmanned direct memory usage without any performance loss.
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