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

[Brian Stansberry (JIRA)]

Increase ClusterPartition buffers to support farming of large files
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                 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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