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This article is about how to use the Yarn command in Hadoop. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Summary:

All yarn commands are invoked in the bin/yarn script. Run the yarn script command without any parameters and print out the description of all the commands.

Usage: yarn [--config confdir] COMMAND

Yarn uses a parsing framework that parses common options and running classes.

COMMAND_OPTIONS

Description

-- config confdir

Override the default configuration directory. Default is ${HADOOP_PREFIX} / conf.

COMMAND

COMMAND_OPTIONS

The options for the various commands are described in the following sections. It is divided into user commands and administrative commands.

User commands:

Jar

Run a JAR file. Users can bind their Yarn code to a JAR file and use this command to execute it.

Usage: yarn jar [mainClass] args...

Application

Application management command

Usage: yarn application

COMMAND_OPTIONS

Description

-list

List applications from RM.

-appStates States

Used with-list to filter a comma-separated list of application states based on input. The status of a valid application can be one of the following: ALL, NEW, NEW_SAVING, SUBMITTED, ACCEPTED, RUNNING, FINISHED, FAILED, KILLED

-appTypes Types

Used with-list to filter application types based on input in a comma-separated list

-status ApplicationId

Print the status of the application

-kill ApplicationId

Kill the application

Node

Print node report

Usage: yarn node

COMMAND_OPTIONS

Description

-list

Lists all running nodes.

-states States

Used with-list to filter the list of nodes based on input comma-separated node states.

-all

Used with-list to list all nodes

-status NodeId

View the status report of the node.

Logs

Dump the container logs

Usage: yarn logs-applicationId

COMMAND_OPTIONS

Description

-applicationId

Specify an application id

-appOwner AppOwner

Application user (if not specified, assigned to the current user by default)

-containerId ContainerId

Container id (container id must be specified if the address of the node is specified)

-nodeAddress NodeAddress

The node address of the formatted nodename: Port, (if container id is specified, the node address must be specified)

Classpath

Prints the class path needed to get the Hadoop jar and the required libraries

Usage: yarn classpath

Administrative commands:

Resourcemanager

Start the ResourceManager

Usage: yarn resourcemanager

Nodemanager

Start the NodeManager

Usage: yarn nodemanager

Proxyserver

Start the web proxy server

Usage: yarn proxyserver

Rmadmin

Yarn rmadmin [- refreshQueues] [- refreshNodes] [- refreshUserToGroupsMapping]

[- refreshSuperUserGroupsConfiguration] [- refreshAdminAcls]

[- refreshServiceAcl] [- getGroups [username]] [- help [cmd]]

[- transitionToActive]

[- transitionToStandby]

[- getServiceState]

[- checkHealth]

Run the ResourceManager management client

Usage:

COMMAND_OPTIONS

Description

-refreshQueues

Reload queue ACL, status, and scheduling features. ResourceManager will reload mapred-qu eues's configuration file

-refreshNodes

Refresh host information through ResourceManager.

-refreshUserToGroupsMappings

Refresh the user group mapping.

-refreshSuperUserGroupsConfiguration

Refresh the superuser agent group mapping.

-refreshAdminAcls

Refresh acls management through ResourceManager

-refreshServiceAcl

Reloading the service level authorization authentication policy file ResourceManager will reload the authorization authentication policy file.

-getGroups [username]

The group to which the specified user belongs

-help [cmd]

Displays help information for a given command, or all commands if you do not specify it.

-transitionToActive

Transition service to active state

-transitionToStandby

Change the service to standby

-getServiceState

Returns the status of the service

-checkHealth

Request the service for a health check. If the check fails, the RMAdmin tool exits a non-zero exit code

Daemonlog

Get/Set the log level for each daemon.

Usage: yarn daemonlog-getlevel

Usage: yarn daemonlog-setlevel

COMMAND_OPTIONS

Description

-getlevel

Print log levels based on daemons on the

The internal connection address of this command: http:///logLevel?log=

-setlevel

Sets the log level of the daemon running at. This command internally connects to http:///logLevel?log=

Based on the daemon log level on the

The internal connection address of this command: http:///logLevel?log=

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