In general, you don't want to synchronize on the cache to do a put. I don't 
know your use case in enough detail (i.e. who's putting what where when) to 
absolutely say you shouldn't, but JBC already provides concurrency control at 
the individual Node level.

I don't know what your isCacheActive() call does; perhaps some synchronization 
is needed there.

Blocking in the GroupRequest for a while during cache replication is perfectly 
normal.  The caller thread sends the RPC call out to the cluster, and then 
blocks waiting for responses that come in separately from each cluster node.  
Seeing a thread blocking there in a thread dump means nothing.  Seeing the 
thread continually blocking there for a long time over more than one thread 
dump tells you that for some reason it's taking a while for responses to come 
back.  The issue then is why it's taking a long time to get responses, which 
could be all sorts of reasons.

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