@sundaram_idfc  Additional information may help here:   What versions of NiFi are bing used by each NiFi instance you have installed? What Java version is being used by each of these NiFi instances? What is your configured "Max Timer Driven thread count" setting under global menu --> controller settings? How many cores does your server have that is running NiFi? Any chance you are occasionally sending a larger FlowFile? When in this state, did you collect a series of NiFi thread dumps to see if the thread is progressing or what it is waiting or blocked by (nifi.sh dump <dump filename>) Any WARN or ERROR related log entries in the nifi-app.log related to this port, OutOfMemory, or file handles? Thanks, Matt ... View more