What are the different commands used to startup and shutdown Hadoop daemons?
• To start all the hadoop daemons use: ./sbin/start-all.sh.
Then, to stop all the Hadoop daemons use:./sbin/stop-all.sh
• You can also start all the dfs daemons together using ./sbin/start-dfs.sh. Yarn daemons together using ./sbin/start-yarn.sh. MR Job history server using /sbin/mr-jobhistory-daemon.sh start history server. Then, to stop these daemons we can use
./sbin/stop-dfs.sh
./sbin/stop-yarn.sh
/sbin/mr-jobhistory-daemon.sh stop historyserver.
• Finally, the last way is to start all the daemons individually. Then, stop them individually:
./sbin/hadoop-daemon.sh start namenode
./sbin/hadoop-daemon.sh start datanode
./sbin/yarn-daemon.sh start resourcemanager
./sbin/yarn-daemon.sh start nodemanager
./sbin/mr-jobhistory-daemon.sh start historyserver