@naveen r The amount of resource a Yarn application will request is completely dependent on the type of Application. For MapReduce, it is generally based on the inputsplit/no. of reducers configured and the memory/vcores configured per mapper/reducer in the JobConf. To check how much Resources are currently being used by a single application, you can use the following Rest API and check the fields "allocatedMB","allocatedVCores" and "runningContainers" GET http://<rm http address:port>/ws/v1/cluster/apps/<applicationId> ... View more

I'm getting bad request as response with message "Attempted to add unknown hosts to a cluster. These hosts have not been registered with the server" ... View more

There are a variety of options for memory. I just tried the same for my cluster and using for example fields=metrics/memory/Use._avg[1534235091,1534235391,15] worked well. Further options quoted from the source code; /clusters/{clusterName}/?fields=metrics/memory/Buffer._avg[{fromSeconds},{toSeconds},{stepSeconds}],metrics/memory/Cache._avg[{fromSeconds},{toSeconds},{stepSeconds}],metrics/memory/Share._avg[{fromSeconds},{toSeconds},{stepSeconds}],metrics/memory/Swap._avg[{fromSeconds},{toSeconds},{stepSeconds}], metrics/memory/Total._avg[{fromSeconds},{toSeconds},{stepSeconds}], metrics/memory/Use._avg[{fromSeconds},{toSeconds},{stepSeconds}]', ... View more