You need to configure NiFi settings after you start NiFi successfully.
Go to Cloudera Manager > Clusters.
Select NiFi.
Click NiFi Web UI.
Log in to NiFi.
On the NiFi UI, click Controller Settings.
The NiFi Settings screen appears.
Go to the Registry Clients tab.
Recheck or configure NiFi Registry URL on the NiFi UI to point to the correct
hostname and port number.
Go to the Reporting Tasks tab.
Remove the AmbariReportingTask setting.
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