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From "Robert Stupp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8907) Raise GCInspector alerts to WARN
Date Thu, 10 Sep 2015 10:45:47 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14738569#comment-14738569
] 

Robert Stupp commented on CASSANDRA-8907:
-----------------------------------------

Ah - wait. Comment in {{cassandra.yaml}} says: _By default, Cassandra logs GC Pauses greater
than 200 ms at INFO level_ but {{Config.java}} tells {{public int gc_warn_threshold_in_ms
= 0;}}. I *think* it will emit a warning for every GC then?

> Raise GCInspector alerts to WARN
> --------------------------------
>
>                 Key: CASSANDRA-8907
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8907
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Adam Hattrell
>            Assignee: Amit Singh Chowdhery
>              Labels: patch
>         Attachments: cassnadra-8907.patch
>
>
> I'm fairly regularly running into folks wondering why their applications are reporting
down nodes.  Yet, they report, when they grepped the logs they have no WARN or ERRORs listed.
> Nine times out of ten, when I look through the logs we see a ton of ParNew or CMS gc
pauses occurring similar to the following:
> INFO [ScheduledTasks:1] 2013-03-07 18:44:46,795 GCInspector.java (line 122) GC for ConcurrentMarkSweep:
1835 ms for 3 collections, 2606015656 used; max is 10611589120
> INFO [ScheduledTasks:1] 2013-03-07 19:45:08,029 GCInspector.java (line 122) GC for ParNew:
9866 ms for 8 collections, 2910124308 used; max is 6358564864
> To my mind these should be WARN's as they have the potential to be significantly impacting
the clusters performance as a whole.



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