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From "Philo Yang (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-8477) CMS GC can not recycle objects
Date Sat, 13 Dec 2014 07:42:13 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14245237#comment-14245237
] 

Philo Yang edited comment on CASSANDRA-8477 at 12/13/14 7:41 AM:
-----------------------------------------------------------------

The old gen in the node with gc trouble rise very fast, if I disable autocompaction, the rising
become much slower.

I'm uploading heap dump file



was (Author: yangzhe1991):
I'm uploading heap dump file

> CMS GC can not recycle objects
> ------------------------------
>
>                 Key: CASSANDRA-8477
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8477
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>         Environment: 2.1.1 or 2.1.2-SNAPSHOT(after CASSANDRA-8459 resolved)
>            Reporter: Philo Yang
>         Attachments: cassandra.yaml, histo.txt, jstack.txt, system.log
>
>
> I have a trouble in my cluster that CMS full gc can not reduce the size of old gen. Days
ago I post this problem to the maillist, people think it will be solved by tuning the gc setting,
however it doesn't work for me. 
> Then I saw a similar bug in CASSANDRA-8447, but [~benedict] think it is not related.
With the jstack on https://gist.github.com/yangzhe1991/755ea2a10520be1fe59a, [~benedict] find
a bug and resolved it in CASSANDRA-8459. So I build a latest version on 2.1 branch and run
the SNAPSHOT version on the nodes with gc trouble. 
> However, there is still the gc issue. So I think opening a new tick and post more information
is a good idea. Thanks for helping me.



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