Ok thanks Val.  Btw, during testing I noticed that because of this issue, if
I had a node in my cluster that did not have the proper jar file deployed
to, and the current node the service was running on went down, if Ignite
tried to re-instantiate the cluster singleton service on the node that
didn't have the right jar, it would throw exception and hang, thereby never
being able to re-instantiate that service on another node. This behavior
breaks the guarantee that Ignite will always have an instance of the service
running despite topology changes.  For now it may be enough to make special
note in the documentation that this service up guarantee is only valid if
all dependent jars have been manually deployed to each node in the cluster.  



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