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From "Stephan Ewen (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (FLINK-3897) why does jobmanager process has too many ForkJoinTask object
Date Thu, 12 May 2016 13:55:12 GMT

    [ https://issues.apache.org/jira/browse/FLINK-3897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15281501#comment-15281501
] 

Stephan Ewen edited comment on FLINK-3897 at 5/12/16 1:54 PM:
--------------------------------------------------------------

Every actor invocation (one or more messages from the mailbox) and each Future has a ForkJoinTask
object, IIRC.

In which situation did you measure that? Were there a lot of messages and futures in progress
at that time?


was (Author: stephanewen):
Every actor invocation (one or more messages from the mailbox) and each Future has a ForkJoinTask
object, IIRC.

In which situation did you measure that? Where there a lot of messages and futures in progress
at that time?

> why does jobmanager process has too many ForkJoinTask object
> ------------------------------------------------------------
>
>                 Key: FLINK-3897
>                 URL: https://issues.apache.org/jira/browse/FLINK-3897
>             Project: Flink
>          Issue Type: Improvement
>            Reporter: ZhengBowen
>
> jmap -histo 21415 |head -10     
>  num     #instances         #bytes  class name
> ----------------------------------------------
>    1:      18458230     5059213664  [C
>    2:         29703     1947328680  [Lscala.concurrent.forkjoin.ForkJoinTask;
>    3:        993331     1361835272  [B
>    4:      35228671     1127317472  akka.dispatch.AbstractNodeQueue$Node
>    5:      23123301      924932040  akka.actor.LightArrayRevolverScheduler$TaskHolder
>    6:      15217224      730426752  java.util.HashMap$Entry
>    7:      16863612      539635584  java.lang.String
> -------------------------------------------
> ForkJoinTask object takes up to 2GB of memory space,and the memory used has been growing.
> why?



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