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https://issues.apache.org/jira/browse/CASSANDRA-8477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14245935#comment-14245935
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Philo Yang commented on CASSANDRA-8477:
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The 242970ms pause is very strange and not easy to reproduce. In the last 24
hours, no full gc costs so long like that. Although there are two times that
node become unresponsive. And one of them happens when I had disabled
autocompaction, so I think disabling autocompaction only slows down the
increasing of heap, can not prevent the trouble.
> 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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