question: void scheduleTMasterContainer ( ) throws ContainerAllocationException { LOG . log ( Level . INFO , "Scheduling container for TM: {0}" , topologyName ) ; launchContainerForExecutor ( new HeronWorker ( TMASTER_CONTAINER_ID , 1 , TM_MEM_SIZE_MB ) ) ; }
target:  Requests container for TMaster as container/executor id 0.