Hadoop service was working smoothly. But all of a sudden "start-all.sh" started failing with following error message.
WARNING: Attempting to start all Apache Hadoop daemons as vishnudas in 10 seconds. WARNING: This is not a recommended production deployment configuration. WARNING: Use CTRL-C to abort. Starting namenodes on [localhost] ERROR: namenode can only be executed by master. Starting datanodes ERROR: datanode can only be executed by master. Starting secondary namenodes [vishnudas-VirtualBox] ERROR: secondarynamenode can only be executed by master. Starting resourcemanager ERROR: resourcemanager can only be executed by master. Starting nodemanagers ERROR: nodemanager can only be executed by master.
