[jboss-user] [Clustering/JBoss] - Problem of merging split cluster

xyoungli do-not-reply at jboss.com
Wed Feb 14 15:16:35 EST 2007

I am seeing a cluster split in our production JBoss environment and wondering why the merging process is not working.  The configuration is as follows:
- JBoss:  4.0.3SP1
- OS: Solaris
- Cluster: there are 5 server instances on the same box. TCP is used as transport:
            <TCP bind_addr="localhost" start_port="${jboss.cluster.tcp.port:7800}" loopback="true"/>
            <TCPPING initial_hosts="localhost[${jboss.cluster.tcp.port:7800}]" port_range="${jboss.cluster.tcp.port.range:5}" timeout="3500"
               num_initial_members="${jboss.cluster.tcp.members:5}" up_thread="true" down_thread="true"/>
            <MERGE2 min_interval="5000" max_interval="10000"/>
            <FD shun="true" timeout="5000" max_tries="5" up_thread="false" down_thread="false" />
            <VERIFY_SUSPECT timeout="4000" down_thread="false" up_thread="false" />
            <pbcast.NAKACK down_thread="true" up_thread="true" gc_lag="100"
            <pbcast.STABLE desired_avg_gossip="20000" down_thread="false" up_thread="false" />
            <pbcast.GMS join_timeout="5000" join_retry_timeout="2000" shun="false"
               print_local_addr="true" down_thread="true" up_thread="true"/>
            <pbcast.STATE_TRANSFER up_thread="true" down_thread="true"/>

4 instances have formed one cluster and 1 instance formed another. The following are from JMX console:
    1) CurrentView java.util.Vector R [,,,] 

    2) CurrentView java.util.Vector R []  

Why the merge process doesn't work?
Is the TCP configuration wrong somewhere? The clustering has been working fine for a few weeks, and it split after restart today.


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