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https://issues.apache.org/jira/browse/FLINK-12736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16879077#comment-16879077
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Till Rohrmann commented on FLINK-12736:
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This sounds like a very good idea [~azagrebin].
> ResourceManager may release TM with allocated slots
> ---------------------------------------------------
>
> Key: FLINK-12736
> URL: https://issues.apache.org/jira/browse/FLINK-12736
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Coordination
> Affects Versions: 1.9.0
> Reporter: Chesnay Schepler
> Assignee: Andrey Zagrebin
> Priority: Critical
> Labels: pull-request-available
> Fix For: 1.9.0
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> The {{ResourceManager}} looks out for TaskManagers that have not had any
> slots allocated on them for a while, as these could be released to safe
> resources. If such a TM is found the RM checks via an RPC call whether the TM
> still holds any partitions. If no partition is held then the TM is released.
> However, in the RPC callback no check is made whether the TM is actually
> _still_ idle. In the meantime a slot could've been allocated on the TM.
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