This is an attempt to fix some of the issues with the cluster mode tests we are seeing in the daily run.
The test is trying to incrementally adds a bunch of publish messages, expecting that eventually one
of them will overflow. The tests stops one of the processes, so it expects that just that one Redis node
will overflow. I think the test is flaky because under certain circumstances multiple links are getting
disconnected, not just the one that is stalled.
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