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From "Brandon Williams (JIRA)" <>
Subject [jira] Commented: (CASSANDRA-651) cassandra 0.5 version throttles and sometimes kills traffic to a node if you restart it.
Date Tue, 29 Dec 2009 19:55:29 GMT


Brandon Williams commented on CASSANDRA-651:

I can still reproduce the issue with this patch applied.  I'm receiving the following traceback:

ERROR - Fatal exception in thread Thread[TCP Selector Manager,5,main]

Because ackCon is already null.  With the assert removed, I'm unable to reproduce.

> cassandra 0.5 version throttles and sometimes kills traffic to a node if you restart
> ----------------------------------------------------------------------------------------
>                 Key: CASSANDRA-651
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.5
>         Environment: latest in 0.5 branch
>            Reporter: Ramzi Rabah
>            Assignee: Gary Dusbabek
>             Fix For: 0.5
>         Attachments: 651-v2.patch
> 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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