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From "Quentin Conner (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6409) gossip performance improvement at node startup
Date Wed, 27 Nov 2013 15:24:35 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13833868#comment-13833868
] 

Quentin Conner commented on CASSANDRA-6409:
-------------------------------------------

+1

Moving getEndpointToTokenMapForReading() did the trick.  I tested the patch against cassandra-1.2
branch and the persistent flapping node and high cpu use symptom disappeared in my 500 node
cluster setup (num_tokens=512).


> gossip performance improvement at node startup
> ----------------------------------------------
>
>                 Key: CASSANDRA-6409
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6409
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Quentin Conner
>         Attachments: 2013-11-26_17-40-08.png, endpointToTokenMapCPU.txt
>
>
> With large clusters (> 500 nodes) and num_tokens > 255 we sometimes see a node
have trouble starting up.  CPU usage for one thread is pegged.
> We see this concurrent with Gossip flaps on the node trying to learn the ring topology.
 Other nodes on the ring, that are already at steady state do not seem to suffer.  It is the
node joining the large ring that has trouble.



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