When 2 drivers are connected ot each other and one of them is shutdown/restarted, then at least one of the drivers is not working properly anymore. I can with VisualVM that there is a at least one lingering class loader channel that should have been closed and removed. Furthermore the faulty driver is then unable to forward class loading requests to the client, whcih prevent any task from executing in its attached nodes.

There are quite a few problems, including when peer discovery is enabled. I have fixed (hopefully) these problems in the trunk and will backport the changes for v4.2.3