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From "Chris Goffinet (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-896) GC issues with LinkedBlockingQueue, very large heap sizes
Date Mon, 15 Mar 2010 07:23:27 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12845210#action_12845210
] 

Chris Goffinet commented on CASSANDRA-896:
------------------------------------------

I took the class from harmony, and added it to Cassandra, making the modification changes.
I don't see much change. Looking closer it seems to be that the majority of data comes from
OutboundTCPConnection

> GC issues with LinkedBlockingQueue, very large heap sizes
> ---------------------------------------------------------
>
>                 Key: CASSANDRA-896
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-896
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 0.6
>            Reporter: Chris Goffinet
>         Attachments: Screen shot 2010-03-14 at 10.19.09 PM.png, Screen shot 2010-03-14
at 10.20.31 PM.png
>
>
> We were doing a large import over thrift today (250M rows) with 50 columns each. We noticed
when this process started, that the heap usage slowly began to rise. Eventually hitting 10GB.
After investigating heap dumps we noticed this is linked to GC problems in the JVM for LinkedBlockingQueue.
Sending a hint through jconsole to perform GC didn't help either.
> See this article:
> http://tech.puredanger.com/2009/02/11/linkedblockingqueue-garbagecollection/
> JDK  1.6.18 doesn't have this fix yet either. We could possibly add the change from:
> http://svn.apache.org/repos/asf/harmony/standard/classlib/trunk/modules/concurrent/src/main/java/java/util/concurrent/LinkedBlockingQueue.java

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