https://community.cloudera.com/t5/Support-Questions/Issue-with-NiFi/m-p/151623#M114102 <A rel="user" href="https://community.cloudera.com/users/3938/joshuaadeleke.html" nodeid="3938">@Joshua Adeleke</A><P>The message you are seeing here indicates that your NiFi instance has been setup as a cluster (possibly a 1 node cluster). NiFi cluster configurations require zookeeper in order handle cluster coordinator elections and cluster state management. If you truly only want a standalone NiFi installation with no dependency on these things, you need to make sure the following property in your nifi.properties file is set to false:</P><PRE>nifi.cluster.is.node=false</PRE><P>Even as a single node NIFi cluster, if zookeeper (internal or external) was setup, the election should complete eventually and the node will then become accessible.</P><P>How long it takes for the cluster coordinator to get elected is controlled by the following lines in your nifi.properties file:</P><PRE>nifi.cluster.flow.election.max.wait.time=5 mins nifi.cluster.flow.election.max.candidates= </PRE><P>The above shows the defaults. If the max.candidates is left blank (Normally set to the number of nodes in your NiFi cluster), the election process will take the full 5 minutes to complete before the UI will become available. If max.candidates is set, then election will complete if either all nodes check in or 5 minutes (whichever occurs first).</P><P>Thanks,</P><P>Matt</P> Mon, 30 Jan 2017 21:11:16 GMT MattWho 2017-01-30T21:11:16Z