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From "John Vines (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-599) investigate permgen collection and class unloading with concurrent mark and sweep garbage collector
Date Fri, 18 May 2012 21:13:09 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13279191#comment-13279191
] 

John Vines commented on ACCUMULO-599:
-------------------------------------

Perhaps this should be a generic look into java garbage collection
configurations. It's been a while since we have done research into that
subject.

Sent from my phone, so pardon the typos and brevity.


                
> investigate permgen collection and class unloading with concurrent mark and sweep garbage
collector
> ---------------------------------------------------------------------------------------------------
>
>                 Key: ACCUMULO-599
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-599
>             Project: Accumulo
>          Issue Type: Bug
>          Components: scripts
>    Affects Versions: 1.3.6, 1.4.0
>            Reporter: Adam Fuchs
>            Assignee: John Vines
>
> The Java concurrent mark and sweep garbage collector appears to default to not unloading
classes or sweeping the permgen storage space. Accumulo reloads classes dynamically, potentially
contributing a lot to the permgen space. It is important that these classes be garbage collected
when we're done with them. Since we use -XX:+UseConcMarkSweepGC by default for all Accumulo
processes, should we also use -XX:+CMSClassUnloadingEnabled and -XX:+CMSPermGenSweepingEnabled?
Are there other flags or parameters that we should set to really do java garbage collection
properly in a long-lived instance?
> These should be set in conf/accumulo-env.sh as part of ACCUMULO_GENERAL_OPTS.

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