This is documentation for MapR Version 5.0. You can also refer to MapR documentation for the latest release.

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The hadoop mradmin command runs Map-Reduce administrative commands.

Syntax

hadoop [ Generic Options ] mradmin 
       [-refreshServiceAcl] 
       [-refreshQueues] 
       [-refreshNodes]
       [-refreshUserToGroupsMappings]
       [-refreshSuperUserGroupsConfiguration]
       [-help [cmd]]

Parameters

The following command parameters are supported for hadoop mradmin:

Parameter

Description

-refreshServiceAcl

Reload the service-level authorization policy file
Job tracker will reload the authorization policy file.

-refreshQueues

Reload the queue acls and state
JobTracker will reload the mapred-queues.xml file.

-refreshUserToGroupsMappings

Refresh user-to-groups mappings.

-refreshSuperUserGroupsConfiguration

Refresh superuser proxy groups mappings.

-refreshNodes

Refresh the hosts information at the job tracker.

-help [cmd]

Displays help for the given command or all commands if none
is specified.

The following generic options are supported for hadoop mradmin:

Generic Option

Description

-conf <configuration file>

Specify an application configuration file.

-D <property=value>

Use value for given property.

-fs <local|file system URI>

Specify a file system.

-jt <local|jobtracker:port>

Specify a job tracker.

-files <comma separated list of files>

Specify comma separated files to be copied to the map reduce cluster.

-libjars <comma seperated list of jars>

Specify comma separated jar files to include in the classpath.

-archives <comma separated list of archives>

Specify comma separated archives to be unarchived on the computer machines.

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