[FLINK-15306] Adjust the default netty transport option from nio to auto

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 1.11.0
• Component/s: Runtime / Configuration, Runtime / Network
• Labels: pull-request-available
• Assignee: Zhijiang
• Reporter: Zhijiang
• Created: 18/Dec/19 05:25
• Updated: 11/Feb/20 09:21
• Resolved: 10/Jan/20 07:31

Description

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.

Issue Links

• is duplicated by: FLINK-13235 Change the Netty default transport mode to auto
• links to: GitHub Pull Request #10662