Hadoop dfsadmin Commands

Hadoop dfsadmin Commands

Command	Description
hadoop dfsadmin -report	Report filesystem info and statistics
hadoop dfsadmin -metasave file.txt	Save namenode’s primary data structures to file.txt
hadoop dfsadmin -setQuota 10 /quotatest	Set Hadoop directory quota to only 10 files
hadoop dfsadmin -clrQuota /quotatest	Clear Hadoop directory quota
hadoop dfsadmin -refreshNodes	Read hosts and exclude files to update datanodes that are allowed to connect to namenode. Mostly used to commission or decommsion nodes
hadoop fs -count -q /mydir	Check quota space on directory /mydir
hadoop dfsadmin -setSpaceQuota /mydir 100M	Set quota to 100M on hdfs directory named /mydir
hadoop dfsadmin -clrSpaceQuota /mydir	Clear quota on a HDFS directory
hadooop dfsadmin -saveNameSpace	Backup Metadata (fsimage & edits). Put cluster in safe mode before this command.

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Hadoop Namenode Commands Hadoop fsck Commands Hadoop Job Commands Hadoop dfsadmin Commands Hadoop Safe Mode (Maintenance Mode) Commands Hadoop Configuration Files Hadoop mradmin Commands Hadoop Balancer Commands Hadoop Filesystem Commands Additional Hadoop Filesystem Commands