zhijiang created FLINK-12571:
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Summary: Make NetworkEnvironment#start() return the binded data
port
Key: FLINK-12571
URL: https://issues.apache.org/jira/browse/FLINK-12571
Project: Flink
Issue Type: Sub-task
Components: Runtime / Network
Reporter: zhijiang
Assignee: zhijiang
Currently `NetworkEnvironment#getConnectionManager()` is mainly used for
`TaskManagerServices` for getting binded data port from
`NettyConnectionManager`. Considering the `ConnectionManager` as an internal
component of `NetworkEnvironment`, it should not be exposed for outsides. For
other ShuffleService implementations, it might have no `ConnectionManager` at
all.
We could make `ShuffleService#start()` return the binded data port to replace
the `getConnectionManager`. For the `LocalConnectionManager` or other shuffle
service implementations which have no binded data port, it could return a
simple default value and it would have no harm.
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