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https://issues.apache.org/jira/browse/FLINK-4094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15405836#comment-15405836
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Stephan Ewen commented on FLINK-4094:
-------------------------------------
If a task requests more memory than the system is configured for, it will throw
an error.
The program translation process calculates the memory budget for each operator
to make sure they don't allocate too much.
> Off heap memory deallocation might not properly work
> ----------------------------------------------------
>
> Key: FLINK-4094
> URL: https://issues.apache.org/jira/browse/FLINK-4094
> Project: Flink
> Issue Type: Bug
> Components: Local Runtime
> Affects Versions: 1.1.0
> Reporter: Till Rohrmann
> Assignee: ramkrishna.s.vasudevan
> Priority: Critical
> Fix For: 1.1.0
>
>
> A user reported that off-heap memory is not properly deallocated when setting
> {{taskmanager.memory.preallocate:false}} (per default) [1]. This can cause
> the TaskManager process being killed by the OS.
> It should be possible to execute multiple batch jobs with preallocation
> turned off. No longer used direct memory buffers should be properly garbage
> collected so that the JVM process does not exceed it's maximum memory bounds.
> [1]
> http://apache-flink-mailing-list-archive.1008284.n3.nabble.com/offheap-memory-allocation-and-memory-leak-bug-td12154.html
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