[jira] [Created] (FLINK-4424) Make network environment start-up/shutdown independent of JobManager association

[Shang Yuanchun (Jira)]

Till Rohrmann created FLINK-4424:
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             Summary: Make network environment start-up/shutdown independent of JobManager association
                 Key: FLINK-4424
                 URL: https://issues.apache.org/jira/browse/FLINK-4424
             Project: Flink
          Issue Type: Sub-task
          Components: Network, TaskManager
            Reporter: Till Rohrmann


Currently, the {{TaskManager}} starts the netty network server only after it has registered with a {{JobManager}}. Upon loss of connection to the {{JobManager}} the {{NetworkEnvironment}} is closed.

The start-up and shutdown of the network server should be independent of the {{JobManager}} connection, especially if we assume that a TM can be associated with multiple JobManagers in the future (FLIP-6).

Starting the network server only once when the {{TaskManager}} is started has the advantage that we don't have to preconfigure the {{TaskManager's}} data port. Furthermore we don't risk to get stuck when disassociating from a {{JobManager}} because the start-up and shutdown of a {{NetworkEnvironment}} can cause problems (because it has to reserve/free resources).



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