@jsensharma  1) Ambari version is the same: 2.7.3.0-139 2) API call that you provided produces same message in ambari-server.log. Here is log message that happens in while api call:       2020-01-31 13:03:03,939 WARN [ambari-client-thread-1469010] HostComponentResourceProvider:1014 - Can not determine request operation level. Operation level property should be specified for this request. 2020-01-31 13:03:03,940 INFO [ambari-client-thread-1469010] HostComponentResourceProvider:969 - Received a updateHostComponent request, clusterName=DEV, serviceName=YARN, componentName=NODEMANAGER, hostname=slave01, request={ clusterName=DEV, serviceName=YARN, componentName=NODEMANAGER, hostname=slave01, publicHostname=null, desiredState=INSTALLED, state=null, desiredStackId=null, staleConfig=null, adminState=null, maintenanceState=null} 2020-01-31 13:03:03,940 INFO [ambari-client-thread-1469010] HostComponentResourceProvider:668 - Ignoring ServiceComponentHost as operation is not allowed, clusterName=DEV, serviceName=YARN, componentName=NODEMANAGER, hostname=slave01, currentState=STARTED, newDesiredState=INSTALLED 2020-01-31 13:03:03,941 INFO [ambari-client-thread-1469010] AmbariManagementControllerImpl:2745 - Created 0 stages 2020-01-31 13:03:04,336 INFO [ambari-client-thread-1469010] MetricsCollectorHAManager:63 - Adding collector host : ambari_server to cluster : DEV​     3) Yes, i'm using same command like i mentioned in my first message. Only differences are cluster name, hostname for ambari server and slave hostname.   ... View more