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From "Anuj Wadehra (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8907) Raise GCInspector alerts to WARN
Date Fri, 04 Sep 2015 13:05:46 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14730762#comment-14730762
] 

Anuj Wadehra commented on CASSANDRA-8907:
-----------------------------------------

Yes. I Agree. We can negotiate on a default value. But my main concern is not the default
value. I am suggesting that this property should be enabled by default as it has severe implications
of marking nodes as DOWN, irrespective of the type of application and it's sensitivity to
GC pauses. 

> 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
>              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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