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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CASSANDRA-2058) Nodes periodically spike in load
Date Thu, 27 Jan 2011 18:41:46 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-2058?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Ellis updated CASSANDRA-2058:
--------------------------------------

    Attachment: 2058-0.7-v3.txt

v3 adds latency tracking to LocalReadRunnable

> 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, 0.7.1
>            Reporter: David King
>            Assignee: Jonathan Ellis
>             Fix For: 0.6.11, 0.7.1
>
>         Attachments: 2058-0.7-v2.txt, 2058-0.7-v3.txt, 2058-0.7.txt, 2058.txt, 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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