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https://issues.apache.org/jira/browse/CASSANDRA-813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12841415#action_12841415
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Jonathan Ellis commented on CASSANDRA-813:
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"time spent" doesn't seem like a very good measure of badness, though.  i 
suspect if you're gc storming time spent on each gc will be low (since there's 
nothing to collect) but it will do a ton of CMS.

> add some kind of logging of GC activity
> ---------------------------------------
>
>                 Key: CASSANDRA-813
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-813
>             Project: Cassandra
>          Issue Type: Task
>            Reporter: Jonathan Ellis
>            Assignee: Brandon Williams
>            Priority: Minor
>             Fix For: 0.6
>
>         Attachments: 0001_log_gc_stats.txt, 813-v2.txt, 813-v3.txt
>
>
> "help, my node froze when i hammered it too hard" is a faq. before we have 
> CASSANDRA-685 it would be nice to make it obvious what is going on w/ gc 
> storms.

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