Hadoop Shell Command，hadoopshell

Hadoop Shell Command，hadoopshell

• Run DFS file system:  hadoop fsck – /
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• Check version of Hadoop: Hadoop version
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• View file listings:  hadoop fs -ls hdfs :/
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• Check memory status:  hadoop fs -df hdfs :/
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• Count of Directories, Files and Bytes inspecified path and file pattern:  hadoop fs -count hdfs :/
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• Move file from one location to another: hadoop fs -mv hdfs:/file hdfs:/dest_file
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• Copy file from source to destination : hadoop fs -cp <src> <dst>
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• Put file from the Local file system toHadoop Distributed File System: hadoop fs  -put <localsrc> … <dst>
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• Copy file from Local to HDFS: hadoop fs  -copyFromLocal <localsrc> …<dst>
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• Format the namenode: hadoop namenode –format
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• Starting Secondary namenode:  hadoop secondrynamenode
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• Run namenode :  hadoop namenode
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• Run data node: hadoop datanode
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• Cluster Balancing: hadoop balance
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• Run MapReduce job tracker node: hadoop jobtracker
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• Run MapReduce task tracker node: hadoop tasktracker
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