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From "Claudio Martella (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-522) JMap Dumper
Date Sun, 17 Feb 2013 23:23:12 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13580324#comment-13580324
] 

Claudio Martella commented on GIRAPH-522:
-----------------------------------------

This is very handy. Although this is mostly useful for us as giraph internals developers,
a couple of lines documentation on usage would be good, maybe to the class javadoc.
                
> JMap Dumper
> -----------
>
>                 Key: GIRAPH-522
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-522
>             Project: Giraph
>          Issue Type: Bug
>            Reporter: Nitay Joffe
>            Assignee: Nitay Joffe
>         Attachments: GIRAPH-522.patch
>
>
> We've been using this for our jobs for a while now and figured we would contribute it
back. This is an observer for both worker and master (in other words for every node) that
periodically dumps the output of "jmap -histo". This has been very handy for us in debugging
memory issues and seeing what allocations are happening.

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