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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