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From "David King (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-2058) Nodes periodically spike in load
Date Wed, 26 Jan 2011 21:22:47 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2058?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12987228#action_12987228
] 

David King commented on CASSANDRA-2058:
---------------------------------------

I've rolled back to 0.6.8 with the DES disabled and not only has the load problem stopped,
performance has also gone back up to previous levels

> Nodes periodically spike in load
> --------------------------------
>
>                 Key: CASSANDRA-2058
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2058
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.6.10
>            Reporter: David King
>         Attachments: cassandra.pmc01.log.bz2, cassandra.pmc14.log.bz2, graph a.png, graph
b.png
>
>
> (Filing as a placeholder bug as I gather information.)
> At ~10p 24 Jan, I upgraded our 20-node cluster from 0.6.8->0.6.10, turned on the DES,
and moved some CFs from one KS into another (drain whole cluster, take it down, move files,
change schema, put it back up). Since then, I've had four storms whereby a node's load will
shoot to 700+ (400% CPU on a 4-cpu machine) and become totally unresponsive. After a moment
or two like that, its neighbour dies too, and the failure cascades around the ring. Unfortunately
because of the high load I'm not able to get into the machine to pull a thread dump to see
wtf it's doing as it happens.
> I've also had an issue where a single node spikes up to high load, but recovers. This
may or may not be the same issue from which the nodes don't recover as above, but both are
new behaviour

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