This was tested on both 3.2.8 sp1 and 4.0.4 GA.

Within a subnet I confiured two nodes A and B using the TCP protocol for 
JGroup(I'm primarily interested in WAN cluster for site failover so next step 
would have been to separate the nodes across WAN).

Node A is started and runs in Master mode. Node B is started and joins the 
DefaultPartition cluster along with node A in Slave mode. So far so good.
Now I disconnect the lan line on the Node B machine. It fails to ping Node A 
and thus changes its mode to Master.

Now plug the connection back in. Node B never joins the DefaultPartition 
cluster with node A.  Node B continues to run in Master mode.

I'd expect it to join the old cluster back and reset its mode to Slave from 
Master.  This will present a serious issue of trying to use Singleton Tasks in 
a cluster.

Any suggestions from anyone if the behavior I'm oberving is not because of some 
n/w configuration issue at Jgroup level for recovery?

Thanks
Kumar Pandey

 



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