[jboss-jira] [JBoss JIRA] Commented: (JBAS-3659) Increase ClusterPartition buffers to support farming of large files

[Brian Stansberry (JIRA)]

    [ http://jira.jboss.com/jira/browse/JBAS-3659?page=comments#action_12343967 ] 
            
Brian Stansberry commented on JBAS-3659:
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I would doubt it.  This should result in an increase of about 2.3MB in memory used by the process (not heap memory; this is memory used by the underlying TCP subsystem.  Not sure what the problems you're seeing are; will respond separately to try to trace it down.

> Increase ClusterPartition buffers to support farming of large files
> -------------------------------------------------------------------
>
>                 Key: JBAS-3659
>                 URL: http://jira.jboss.com/jira/browse/JBAS-3659
>             Project: JBoss Application Server
>          Issue Type: Task
>      Security Level: Public(Everyone can see) 
>          Components: Clustering
>            Reporter: Brian Stansberry
>         Assigned To: Brian Stansberry
>            Priority: Minor
>             Fix For: JBossAS-4.0.5.GA
>
>
> The receive buffers in the cluster-service.xml UDP protocol are only 150K.  Farming sends files around the cluster in 512K chunks.  With the default config, the receive buffer sizes are not even large enough to hold one chunk.  This can lead to problems where the packets that make up part of a chunk get dropped and have to be retransmitted.  With very large files, this can slow things down to the point that timeouts start getting tripped and the transfer fails.
> We had a support case where increasing the buffers to the sizes used by the fc-fast-minimalthreads config took care of the problem.  That config uses 25MB send buffers for both mcast and unicast; don't think we need to increase to such a high number for this.  But, I will bump the receive buffers to 640K and the sends to perhaps 2MB.

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