We are on nifi-1.11.4, on a 3 node cluster, and we are observing frequent node disconnections.
..Disconnect Code=Lack of Heartbeat, Disconnect Reason=Have not received a heartbeat from node in 42 seconds, updateId=62]
While we investigate the issue for lack of heartbeat, we were trying to increase the disconnection threshold from the default 40 seconds [nifi.cluster.protocol.heartbeat.missable.max=8 X nifi.cluster.protocol.heartbeat.interval=5 sec] to 300 seconds. However, even when we applied the nifi.cluster.protocol.heartbeat.missable.max=60 setting change on all nodes, we still observe the node disconnections occurring after 40 seconds. Any thoughts on why this setting is not getting picked up?