MDB in cluster, only half recieving messages

I am running tests on the following scenario; I have a cluster with 4 boxes, all 4 cpu. On each box I run two WLS instances, one on port 8000, the other on port 8010. All instances run in a cluster. I have a separate box running a single JMS server. The cluster has a message driven bean deployed (40 in initial pool). When i start up the cluster, i can see the correct amount of listeners to the external JMS provider (8 x 40), however, for some reason or other, only the mdb in the instances on port 8000 will actually recieve the messages and process them. The other four instances basically do nothing. I?m running wls 7 sp3 on linux with JRockit. Any idea what can be wrong here?

Hi Sven,
          Is the external JMS provider WebLogic?
          If not, note that some (typically lower end) JMS providers
          make absolutely no effort to be "fair" about distributing
          messages to their clients - if some clients consume messages
          fast enough then other clients will never get messages.
          WL JMS attempts to be "fair" and hand-out messages round-robin.
          If so, are you sending enough messages prior to booting? The
          asynchronous message pipeline (sometimes referred
          to as message backlog) in WL JMS clients (and some other vendors)
          will consume extra messages as the MDB cluster boots. For
          example - if server1 boots first, it will fill its pipe-lines
          with 10*(num instances) messages even before it begins processing
          the first message, then the next server to boot will get the next
          10*(num instances) messages, and if you didn't send enough
          messages to begin with,
          server3 and server4 are out of luck. This pipeline behavior
          becomes even more noticable if there are mul
          If this doesn't help, I recommend contacting customer
          support.
          Tom, BEA
          sven wrote:
          > I am running tests on the following scenario; I have a cluster with 4 boxes, all 4 cpu. On each box I run two WLS instances, one
          > on port 8000, the other on port 8010. All instances run in a cluster. I have a separate box running a single JMS server. The
          > cluster has a message driven bean deployed (40 in initial pool). When i start up the cluster, i can see the correct amount of listeners
          > to the external JMS provider (8 x 40), however, for some reason or
          other, only the mdb in the instances on port 8000 will actually
          > recieve the messages and process them. The other four instances basically do nothing. I?m running wls 7 sp3 on linux with JRockit. Any idea
          > what can be wrong here?

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Edited by: Ron_B on 2010-04-13 13:35
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MDB in cluster, only half recieving messages

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