Unable to start ZKFC

[#1]

While trying to start ZKFC from Ambari, its failing with the below error:

resource_management.core.exceptions.ExecutionFailed: Execution of 'ambari-sudo.sh su hdfs -l -s 
/bin/bash -c 'ulimit -c unlimited ;  /usr/hdp/3.1.0.0-78/hadoop/bin/hdfs --config /usr/hdp/3.1.0.0-78/hadoop/conf 
--daemon start zkfc'' returned 1. ERROR: Cannot set priority of zkfc process 2866

Does anybody know a solution,

Thanks in advance

[#2]

@ManjunathK Can you check the jars in the hadoop class /usr/hdp/3.1.0.0-78/hadoop-hdfs/ in the problematic node and see if there is any 0 bytes file. If yes, then copy all the jars from working node and started the services.

[#3]

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