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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4094) Off heap memory deallocation might not properly work
Date Fri, 05 Aug 2016 11:44:20 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15409350#comment-15409350
] 

ramkrishna.s.vasudevan commented on FLINK-4094:
-----------------------------------------------

Updated the PR. Pls check.
[~StephanEwen]
Thanks for the comments. 
bq. I think before we change memory allocation behavior, we should discuss that on the Flink
mailing list.
ARe we going to send a mail to the community and decide if we can allow preAllocation for
OFFHEAP buffers? 

> 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
>
> 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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