Managine Hadoop Cluster
       If you are working on Hadoop, you’ll realize there are several shell commands available to manage your Hadoop cluster.    Hadoop administration commands.     1. Name node Commands              Command      Description         hadoop namenode   -format      Format HDFS   filesystem from Namenode         hadoop namenode   -upgrade      Upgrade the   NameNode         start-dfs.sh      Start HDFS   Daemons                                stop-dfs.sh      Stop HDFS Daemons         start-mapred.sh      Start MapReduce   Daemons         stop-mapred.sh      Stop MapReduce   Daemons         hadoop namenode   -recover -force      Recover namenode   metadata after a cluster failure (may lose data)                  2. fsck Commands           Command      Description         hadoop fsck /      Filesystem check   on HDFS         hadoop fsck /   -files      Display files   duri...
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