I recently face this same issue on one of our environment.  Error: returned 1. ERROR: Cannot set priority of zkfc process 24167 When digged more on the ZKFC Log, I found this error: ERROR org.apache.hadoop.ha.ZKFailoverController: Unable to start failover controller. Parent znode does not exist. I applied the solution to format ZKFC and once done I have restarted the services and it worked fine. bin/hdfs zkfc -formatZK ... View more

The following map rule is wrong:   RULE:[2:\$1@\$0](rm@MY_REALM)s/.*/rm/   the user for the ResourceManager is not "rm" but "yarn" and this should be the replacement value. This is the same as for the hadoop.security.auth_to_local in Hadoop/HDFS configuration. ... View more

Yes,   I end up downgrading Java version from  1.8.0.252 to  1.8.0.232   This issue got fixed.   Thanks ... View more