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From "Brandon Williams (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-651) cassandra 0.5 version throttles and sometimes kills traffic to a node if you restart it.
Date Mon, 28 Dec 2009 22:01:29 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12794945#action_12794945
] 

Brandon Williams commented on CASSANDRA-651:
--------------------------------------------

I was able to reproduce this in a 4 node setup as well.  The recovered node does not appear
to receive any writes after rejoining the cluster, and I receive TimedOutExceptions in the
client.   I was able to write directly to the recovered node and things appeared to work,
however after a while a different node OOM'd.  I examined the dump in MAT and it shows org.apache.cassandra.net.MessagingService
occupies 72.53% of the available heap, followed by java.util.concurrent.LinkedBlockingQueue
using 11.87%.

> cassandra 0.5 version throttles and sometimes kills traffic to a node if you restart
it.
> ----------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-651
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-651
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.5
>         Environment: latest in 0.5 branch
>            Reporter: Ramzi Rabah
>            Assignee: Jaakko Laine
>             Fix For: 0.5
>
>
> From the cassandra user message board: 
> "I just recently upgraded to latest in 0.5 branch, and I am running
> into a serious issue. I have a cluster with 4 nodes, rackunaware
> strategy, and using my own tokens distributed evenly over the hash
> space. I am writing/reading equally to them at an equal rate of about
> 230 reads/writes per second(and cfstats shows that). The first 3 nodes
> are seeds, the last one isn't. When I start all the nodes together at
> the same time, they all receive equal amounts of reads/writes (about
> 230).
> When I bring node 4 down and bring it back up again, node 4's load
> fluctuates between the 230 it used to get to sometimes no traffic at
> all. The other 3 still have the same amount of traffic. And no errors
> what so ever seen in logs. " 

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