Github user JPercivall commented on the issue:
https://github.com/apache/nifi/pull/678
I have two processors (generate -> logAttribute) in a 3 node secure cluster
and when I restart occasionally I'll get repeating messages of "Failed to
retrieve any new heartbeat information for nodes. Will not make any decisions
based on heartbeats." originating from different nodes.
I think this is caused by nodes not having a consistent view of the cluster.
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