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Most-used commands

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Connection

hadoop fs -ls List files and directories in HDFS hdfs dfs -ls Alternative syntax to list files and directories hdfs getconf -confKey Get configuration information

File Operations

hadoop fs -put Upload files from local to HDFS hadoop fs -get Download files from HDFS to local hadoop fs -cp Copy files within HDFS hadoop fs -mv Move files within HDFS hadoop fs -rm Delete a file from HDFS hadoop fs -rm -r Delete a directory recursively hadoop fs -mkdir Create a directory in HDFS hadoop fs -cat View file content hadoop fs -tail View the last part of a file hadoop fs -touchz Create an empty file

File System Status

hadoop fs -df -h Show disk usage with human-readable format hadoop fs -du -h Show disk usage for specified files/directories hadoop fs -count Count files in directory hadoop fsck Check HDFS file system health hdfs dfsadmin -report Get overall HDFS status hdfs dfsadmin -safemode enter|leave|get|wait Manage safe mode

Permissions & Ownership

hadoop fs -chmod Change file permissions hadoop fs -chown : Change file ownership hadoop fs -chgrp Change file group

Quotas & Snapshots

hdfs dfsadmin -setQuota Set file count quota hdfs dfsadmin -setSpaceQuota Set space quota hdfs dfsadmin -clrQuota Clear file count quota hdfs dfsadmin -clrSpaceQuota Clear space quota hdfs dfs -createSnapshot Create snapshot hdfs dfs -deleteSnapshot Delete snapshot

Cluster Management

hdfs haadmin -getServiceState Get HA state of namenode hdfs haadmin -failover Initiate failover hadoop job -list List running jobs hadoop job -kill Kill a running job