[jira] [Created] (NIFI-5111) When cluster coordinator is changed, it can kick nodes out of the cluster

["Mark Payne (JIRA)" <ji...@apache.org>]

Mark Payne created NIFI-5111:
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             Summary: When cluster coordinator is changed, it can kick nodes out of the cluster
                 Key: NIFI-5111
                 URL: https://issues.apache.org/jira/browse/NIFI-5111
             Project: Apache NiFi
          Issue Type: Bug
            Reporter: Mark Payne
            Assignee: Mark Payne
             Fix For: 1.7.0


If Node A is elected cluster coordinator, all of the nodes in the cluster will begin to send it heartbeats. It will store the latest heartbeat from each node into a map along with a timestamp. If Cluster Coordinator role is then delegated to another node and later Node A is elected again, it has potentially very old, stale heartbeats. If it begins to monitor these heartbeats before receiving a new heartbeat from a node, it will determine that said node has not sent a heartbeat since before Node A lost its role as Cluster Coordinator. We need to ensure that we are clearing out any previously stored heartbeats when a node loses its role as Cluster Coordinator.



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