I'm wondering if it's feasible to extend the memory/CPU/disk of Sandbox deployed on Microsoft Cloud - Azure, after VM being provisioned?
Yes it is. Shutdown all services on ambari and then shut down ambari . increase memory, cpu, disk. bring up ambari and all service. Update yarn with new CPU & memory configurations (provide new max ram & cpu capabilities). for HDFS, via ambari provide new disk so NN will storage data blocks on new disk