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From "David King (JIRA)" <>
Subject [jira] Created: (CASSANDRA-2058) Nodes periodically spike in load
Date Wed, 26 Jan 2011 01:20:43 GMT
Nodes periodically spike in load

                 Key: CASSANDRA-2058
             Project: Cassandra
          Issue Type: Bug
          Components: Core
    Affects Versions: 0.6.10
            Reporter: David King

(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

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