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Date: Thu, 4 Mar 2010 04:37:27 +0000 (UTC)
From: "Jonathan Ellis (JIRA)" <jira@apache.org>
To: cassandra-commits@incubator.apache.org
Subject: [jira] Updated: (CASSANDRA-813) add some kind of logging of GC
 activity
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     [ https://issues.apache.org/jira/browse/CASSANDRA-813?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Ellis updated CASSANDRA-813:
-------------------------------------

    Attachment: 813-v2.txt

cleaned up some.

unsolved problem: do we want to log ParNew as debug, while leaving ConcurrentMarkSweep at INFO?  ParNew is pretty aggressive in my testing, spamming the logs with that isn't very useful.  But, people may experiment w/ different gc types (e.g. G1) so hardcoding this seems Bad.  But maybe we should let the first person who wants to experiment w/ G1 deal with that. :)

semi-related interesting thread from Voldemort on GC settings: http://groups.google.com/group/project-voldemort/browse_thread/thread/24230399a0d34dc8/d893fb5bcaf0d173?#d893fb5bcaf0d173

> 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
>
>
> "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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