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

["Flink Jira Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-22816?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Flink Jira Bot updated FLINK-22816:
-----------------------------------
    Labels: stale-major  (was: )

I am the [Flink Jira Bot|https://github.com/apache/flink-jira-bot/] and I help the community manage its development. I see this issues has been marked as Major but is unassigned and neither itself nor its Sub-Tasks have been updated for 30 days. I have gone ahead and added a "stale-major" to the issue". If this ticket is a Major, please either assign yourself or give an update. Afterwards, please remove the label or in 7 days the issue will be deprioritized.


> 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
>            Priority: Major
>              Labels: stale-major
>
> 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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