Support Questions
Find answers, ask questions, and share your expertise
Check out our newest addition to the community, the Cloudera Innovation Accelerator group hub.

NiFi UnknowHostException in Cluster

Our group is experiencing issues in our Dev cluster (5 servers). The attached error has started kicking users out of the UI and we are having trouble identifying the underlying issue. Any help is appreciated.


Server is working fine. After a couple hours this error (" (Hostname)") starts kicking users out of the webUI.




Master Guru
@Zack Atkinson

Make sure that every node in your NiFi Cluster can resolve the hostnames for every other node in your NiFi cluster.

Make sure that all NiFi nodes can resolve and reach the configured zookeeper servers.

Make sure the following properties are set and their are no typos (including leading or trailing whitespaces) in the file:

nifi.zookeeper.connect.string <-- should be set to resolvable hostnames for zookeeper servers or <-- should be set to resolvable hostname for server <-- should be set to resolvable hostname for server

What is seen in the nifi-app.log around timeframe issue occurs? Is there a full stack trace with this error?