[jira] [Created] (FLINK-12571) Make NetworkEnvironment#start() return the binded data port

[Shang Yuanchun (Jira)]

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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