[jira] [Updated] (CASSANDRA-8477) CMS GC can not recycle objects

["Philo Yang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-8477?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Philo Yang updated CASSANDRA-8477:
----------------------------------
    Attachment: system.log.2014-12-15_1226
                log1.txt
                log2.txt

Swap is not been disabled, but it seems that swap is never used.

I uploaded 3 files from one node that was unresponsive this morning but recovered by itself after several minutes. log1 and log2 is the file output by -XX:LogFile and -Xloggc

> 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, log1.txt, log2.txt, system.log, system.log.2014-12-15_1226
>
>
> 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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