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Date: Sun, 1 Jul 2012 06:41:51 +0000 (UTC)
From: "Jonathan Ellis (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (CASSANDRA-4066) Cassandra cluster stops
 responding on time change (scheduling not using monotonic time?)
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    [ https://issues.apache.org/jira/browse/CASSANDRA-4066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13404692#comment-13404692 ] 

Jonathan Ellis commented on CASSANDRA-4066:
-------------------------------------------

http://serverfault.com/a/403767
                
> Cassandra cluster stops responding on time change (scheduling not using monotonic time?) 
> -----------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-4066
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4066
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>         Environment: Linux; CentOS6 2.6.32-220.4.2.el6.x86_64
>            Reporter: David Daeschler
>            Assignee: Brandon Williams
>            Priority: Minor
>              Labels: gossip
>             Fix For: 1.1.1
>
>
> The server installation I set up did not have ntpd installed in the base installation. When I noticed that the clocks were skewing I installed ntp and set the date on all the servers in the cluster. A short time later, I started getting UnavailableExceptions on the clients. 
> Also, one sever seemed to be unaffected by the time change. That server happened to have it's time pushed forward, not backwards like the other 3 in the cluster. This leads me to believe something is running on a timer/schedule that is not monotonic.
> I'm posting this as a bug, but I suppose it might just be part of the communication protocols etc for the cluster and part of the design. But I think the devs should be aware of what I saw.
> Otherwise, thank you for a fantastic product. Even after restarting 75% of the cluster things seem to have recovered nicely.

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