[jira] [Created] (FLINK-15306) Adjust the default netty transport option from nio to auto

[Shang Yuanchun (Jira)]

zhijiang created FLINK-15306:
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             Summary: Adjust the default netty transport option from nio to auto
                 Key: FLINK-15306
                 URL: https://issues.apache.org/jira/browse/FLINK-15306
             Project: Flink
          Issue Type: Improvement
          Components: Runtime / Network
            Reporter: zhijiang
            Assignee: zhijiang
             Fix For: 1.11.0


The default option of `taskmanager.network.netty.transport` in NettyShuffleEnvironmentOptions is `nio` now. As we know, the `epoll` mode can get better performance, less GC and have more advanced features which are only available on linux.

Therefore it is better to adjust the default option to `auto` instead, and then the framework would automatically choose the proper mode based on the platform.

We would further verify the performance effect via micro benchmark if possible.



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