Apache NiFi Configuration Best Practices
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Delete Nodes

There are cases where a DFM may wish to continue making changes to the flow, even though a node is not connected to the cluster. In this case, the DFM may elect to delete the node from the cluster entirely. In the Cluster Management dialog, select the "Delete" icon () for a Disconnected or Offloaded node. Once deleted, the node cannot be rejoined to the cluster until it has been restarted.