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https://issues.apache.org/jira/browse/FLINK-18760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17167636#comment-17167636
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Xintong Song commented on FLINK-18760:
--------------------------------------

Offline discussed with [~Jiangang], and he's willing to work on this ticket as 
a follow-up of FLINK-18625.
Thanks [~Jiangang].

> Redundant task managers should be released when there's no job running in 
> session cluster
> -----------------------------------------------------------------------------------------
>
>                 Key: FLINK-18760
>                 URL: https://issues.apache.org/jira/browse/FLINK-18760
>             Project: Flink
>          Issue Type: Improvement
>          Components: Runtime / Coordination
>    Affects Versions: 1.12.0
>            Reporter: Xintong Song
>            Assignee: Liu
>            Priority: Major
>             Fix For: 1.12.0
>
>
> In FLINK-18625, we introduced redundant task managers, as backup resources 
> for speeding up job recovery in cases of task manager lost.
> For a session cluster, when there's no job running, it would be better to not 
> keep such redundant resources. Currently, Flink session cluster will not 
> request redundant task managers until a job is submitted, but it also will 
> not release redundant task managers after all jobs terminated.
> This ticket proposes to check and release task managers if there are 
> redundant task managers only.



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