Till Rohrmann created FLINK-25849:
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Summary: Differentiate TaskManager sessions
Key: FLINK-25849
URL: https://issues.apache.org/jira/browse/FLINK-25849
Project: Flink
Issue Type: Sub-task
Components: Runtime / Coordination
Affects Versions: 1.15.0
Reporter: Till Rohrmann
Assignee: Till Rohrmann
With the introduction of configurable {{ResourceID}} for {{TaskManager}}
processes, it can happen that a restarted {{TaskManager}} process will be
restarted with the same {{ResourceID}}. When it now tries to register at the
{{JobMaster}}, the {{JobMaster}} won't recognize it as a new instance because
it only compares the {{ResourceID}}. As a consequence, the {{JobMaster}} things
that this is a duplicate registration and ignores it.
It would be better if the {{TaskManager}} would send a session id with the
registration that could then be used to decide whether a new instance tries to
register at the {{JobMaster}} and, therefore, the old one needs to be
disconnected or whether the registration attempt is a duplicate.
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