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From "Stephan Ewen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4094) Off heap memory deallocation might not properly work
Date Tue, 02 Aug 2016 16:09:20 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15404270#comment-15404270
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Stephan Ewen commented on FLINK-4094:
-------------------------------------

True, it is not documented the {{preallocate == false}} returns the memory, but is is quite
a desirable behavior, actually.

> 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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