2.Cluster Metrics API
获取集群度量信息，重要的信息有：全部
URL
Http Operations Supported
Elements of the metricsInfo object
Item Data Type Description
appsSubmitted int The number of applications submitted
appsCompleted int The number of applications completed
appsPending int The number of applications pending
appsRunning int The number of applications running
appsFailed int The number of applications failed
appsKilled int The number of applications killed
reservedMB long The amount of memory reserved in MB
availableMB long The amount of memory available in MB
allocatedMB long The amount of memory allocated in MB
totalMB long The amount of total memory in MB
reservedVirtualCores long The number of reserved virtual cores
availableVirtualCores long The number of available virtual cores
allocatedVirtualCores long The number of allocated virtual cores
totalVirtualCores long The total number of virtual cores
containersAllocated int The number of containers allocated
containersReserved int The number of containers reserved
containersPending int The number of containers pending
totalNodes int The total number of nodes
activeNodes int The number of active nodes
lostNodes int The number of lost nodes
