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


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:
>             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, [~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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