[jira] [Created] (FLINK-22816) Investigate feasibility of supporting multiple RM leader sessions within JM process

["Xintong Song (Jira)" <ji...@apache.org>]

Xintong Song created FLINK-22816:
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             Summary: Investigate feasibility of supporting multiple RM leader sessions within JM process
                 Key: FLINK-22816
                 URL: https://issues.apache.org/jira/browse/FLINK-22816
             Project: Flink
          Issue Type: Improvement
          Components: Runtime / Coordination
            Reporter: Xintong Song


In FLINK-21667, we decoupled RM leadership and lifecycle managements. RM is not started after obtaining leadership, and stopped on losing leadership.

Ideally, we may start and stop multiple RMs, as the process obtains and loses leadership. However, as discussed in the [PR|https://github.com/apache/flink/pull/15524#pullrequestreview-663987547], having a process to start multiple RMs may cause problems in some deployment modes. E.g., repeated AM registration is not allowed on Yarn.

We need to investigate for all deployments that:
- Whether having multiple leader sessions causes problems.
- If it does, what can we do to solve the problem.

For information, multi-leader-session support for RM has been implemented in FLINK-21667, but is disabled by default. To enable, add the system property "flink.tests.enable-rm-multi-leader-session". 



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