NiFi node stops and gets disconnected from the cluster

[#1]

We have a three node Nifi HDF cluster installed which was running fine Until changes were made to the NiFi content repository default dir and then restarted NiFi, All three nodes were running fine, but after sometime node 2 Stopped and when I tried to start, It was unable to start and gets disconnected from the cluster and when I tried checking the bootstrap logs it just stays. NiFi started, NiFi stopped and NiFi died.
Any suggestions??