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https://issues.apache.org/jira/browse/FLINK-934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14030460#comment-14030460
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ASF GitHub Bot commented on FLINK-934:
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Github user StephanEwen commented on the pull request:
https://github.com/apache/incubator-flink/pull/14#issuecomment-45997219
When we pass the flags, we make sure that Xms and -Xmx are the same, to
prevent the JVM from being funny and resizing the heap from time to time. I
think we loose that with this option. But I guess its all right, on cluster
setups we would expect those to be set anyways.
> 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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