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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-934) Job and TaskManager startup scripts always set JVM heap size
Date Fri, 13 Jun 2014 10:42:02 GMT

    [ https://issues.apache.org/jira/browse/FLINK-934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14030470#comment-14030470
] 

ASF GitHub Bot commented on FLINK-934:
--------------------------------------

Github user uce commented on the pull request:

    https://github.com/apache/incubator-flink/pull/14#issuecomment-45997673
  
    Yes, the other flags are set as before. The `Xms` and `Xmx` flags are only set, when they
are found in `stratosphere-conf.yaml`.
    
    While doing the PR, I came to the same conclusion as your second comment. But we can actually
also do something more fancy and figure out the available memory ourselves and set it (thereby
circumventing the defaults).


> Job and TaskManager startup scripts always set JVM heap size
> ------------------------------------------------------------
>
>                 Key: FLINK-934
>                 URL: https://issues.apache.org/jira/browse/FLINK-934
>             Project: Flink
>          Issue Type: Improvement
>            Reporter: Ufuk Celebi
>
> The default distribution config {{stratosphere-conf.yaml}} contains keys {{jobmanager.heap.mb}}
and {{taskmanager.heap.mb}} for the heap sizes of the JobManager and TaskManager JVMs. If
they are not set, {{config.sh}} has default values for them.
> We _always_ use one of these values and set the {{Xms}} and {{Xmx}} properties. After
a short discussion with [~rmetzger] and [~StephanEwen] we actually expected that they should
not be set if not found in {{stratosphere-conf.yaml}}. This would result in a fall back to
the respective JVM default (imho 1/4th of the physical memory since Java 6).



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