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https://issues.apache.org/jira/browse/FLINK-2772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15851529#comment-15851529
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Greg Hogan commented on FLINK-2772:
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Thanks for the pointer. This behavior changed in FLINK-3073.
> Introduce dedicated garbage collector config parameter and set default values
> for batch and streaming
> -----------------------------------------------------------------------------------------------------
>
> Key: FLINK-2772
> URL: https://issues.apache.org/jira/browse/FLINK-2772
> Project: Flink
> Issue Type: Improvement
> Components: Build System
> Reporter: Till Rohrmann
> Priority: Minor
>
> The {{taskmanager.sh}} start up script sets a default garbage collector if
> the execution mode is {{streaming}} and if no {{env.java.opts}} configuration
> value has been set. In the batch case, nothing is done. This seems to be
> inconsistent. Therefore, I propose to add a dedicated configuration parameter
> for the garbage collector. If the parameter is not set, then a default value
> is set (e.g. G1 or CMS) for batch and streaming.
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