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https://issues.apache.org/jira/browse/PIG-5454?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Koji Noguchi updated PIG-5454:
------------------------------
    Attachment: pig-5454-v01.patch

This was not as simple as I hoped for. 
I was incorrectly assuming that when multiple GCs are specified, jvm will pick 
the last one.  Instead, jvm fails to start with 
bq. Conflicting collector combinations in option list; please refer to the 
release notes for the combinations allowed

Here, attaching a patch that looks at the specified options and only adds 
"-XX:+UseParallelGC" when other GC is not specified. 

> Make ParallelGC the default Garbage Collection
> ----------------------------------------------
>
>                 Key: PIG-5454
>                 URL: https://issues.apache.org/jira/browse/PIG-5454
>             Project: Pig
>          Issue Type: Bug
>          Components: impl
>            Reporter: Koji Noguchi
>            Assignee: Koji Noguchi
>            Priority: Major
>         Attachments: pig-5454-v01.patch
>
>
> From JDK9 and beyond, G1GC became the default GC. 
> I've seen our users hitting OOM after migrating to recent jdk and the issue 
> going away after reverting back to ParallelGC.  
> Maybe the GC behavior assumed by SelfSpillBag does not work with G1GC.



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