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YARN Commands
=============

* [Overview](#Overview)
* [User Commands](#User_Commands)
    * [application](#application)
    * [applicationattempt](#applicationattempt)
    * [classpath](#classpath)
    * [container](#container)
    * [jar](#jar)
    * [logs](#logs)
    * [node](#node)
    * [queue](#queue)
    * [version](#version)
* [Administration Commands](#Administration_Commands)
    * [daemonlog](#daemonlog)
    * [nodemanager](#nodemanager)
    * [proxyserver](#proxyserver)
    * [resourcemanager](#resourcemanager)
    * [rmadmin](#rmadmin)
    * [scmadmin](#scmadmin)
    * [sharedcachemanager](#sharedcachemanager)
    * [timelineserver](#timelineserver)
* [Files](#Files)
    * [etc/hadoop/hadoop-env.sh](#etchadoophadoop-env.sh)
    * [etc/hadoop/yarn-env.sh](#etchadoopyarn-env.sh)
    * [etc/hadoop/hadoop-user-functions.sh](#etchadoophadoop-user-functions.sh)
    * [~/.hadooprc](#a.hadooprc)

Overview
--------

YARN commands are invoked by the bin/yarn script. Running the yarn script without any arguments prints the description for all commands.

Usage: `yarn [SHELL_OPTIONS] COMMAND [GENERIC_OPTIONS] [COMMAND_OPTIONS]`

YARN has an option parsing framework that employs parsing generic options as well as running classes.

| COMMAND\_OPTIONS | Description |
|:---- |:---- |
| SHELL\_OPTIONS | The common set of shell options. These are documented on the [Commands Manual](../../hadoop-project-dist/hadoop-common/CommandsManual.html#Shell_Options) page. |
| GENERIC\_OPTIONS | The common set of options supported by multiple commands. See the Hadoop [Commands Manual](../../hadoop-project-dist/hadoop-common/CommandsManual.html#Generic_Options) for more information. |
| COMMAND COMMAND\_OPTIONS | Various commands with their options are described in the following sections. The commands have been grouped into [User Commands](#User_Commands) and [Administration Commands](#Administration_Commands). |

User Commands
-------------

Commands useful for users of a Hadoop cluster.

### `application`

Usage: `yarn application [options] `

| COMMAND\_OPTIONS | Description |
|:---- |:---- |
| -appStates States | Works with -list to filter applications based on input comma-separated list of application states. The valid application state can be one of the following:  ALL, NEW, NEW\_SAVING, SUBMITTED, ACCEPTED, RUNNING, FINISHED, FAILED, KILLED |
| -appTypes Types | Works with -list to filter applications based on input comma-separated list of application types. |
| -list | Lists applications from the RM. Supports optional use of -appTypes to filter applications based on application type, and -appStates to filter applications based on application state. |
| -kill ApplicationId | Kills the application. |
| -status ApplicationId | Prints the status of the application. |

Prints application(s) report/kill application

### `applicationattempt`

Usage: `yarn applicationattempt [options] `

| COMMAND\_OPTIONS | Description |
|:---- |:---- |
| -help | Help |
| -list ApplicationId | Lists applications attempts from the RM |
| -status Application Attempt Id | Prints the status of the application attempt. |

prints applicationattempt(s) report

### `classpath`

Usage: `yarn classpath`

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

### `container`

Usage: `yarn container [options] `

| COMMAND\_OPTIONS | Description |
|:---- |:---- |
| -help | Help |
| -list ApplicationId | Lists containers for the application attempt. |
| -status ContainerId | Prints the status of the container. |

prints container(s) report

### `jar`

Usage: `yarn jar <jar> [mainClass] args... `

Runs a jar file. Users can bundle their YARN code in a jar file and execute it using this command.

### `logs`

Usage: `yarn logs -applicationId <application ID> [options] `

| COMMAND\_OPTIONS | Description |
|:---- |:---- |
| -applicationId \<application ID\> | Specifies an application id |
| -appOwner AppOwner | AppOwner (assumed to be current user if not specified) |
| -containerId ContainerId | ContainerId (must be specified if node address is specified) |
| -help | Help |
| -nodeAddress NodeAddress | NodeAddress in the format nodename:port (must be specified if container id is specified) |

Dump the container logs

### `node`

Usage: `yarn node [options] `

| COMMAND\_OPTIONS | Description |
|:---- |:---- |
| -all | Works with -list to list all nodes. |
| -list | Lists all running nodes. Supports optional use of -states to filter nodes based on node state, and -all to list all nodes. |
| -states States | Works with -list to filter nodes based on input comma-separated list of node states. |
| -status NodeId | Prints the status report of the node. |

Prints node report(s)

### `queue`

Usage: `yarn queue [options] `

| COMMAND\_OPTIONS | Description |
|:---- |:---- |
| -help | Help |
| -status QueueName | Prints the status of the queue. |

Prints queue information

### `version`

Usage: `yarn version`

Prints the Hadoop version.

Administration Commands
-----------------------

Commands useful for administrators of a Hadoop cluster.

### `daemonlog`

Usage:

```
   yarn daemonlog -getlevel <host:httpport> <classname> 
   yarn daemonlog -setlevel <host:httpport> <classname> <level>
```

| COMMAND\_OPTIONS | Description |
|:---- |:---- |
| -getlevel `<host:httpport>` `<classname>` | Prints the log level of the log identified by a qualified `<classname>`, in the daemon running at `<host:httpport>`. This command internally connects to `http://<host:httpport>/logLevel?log=<classname>` |
| -setlevel `<host:httpport> <classname> <level>` | Sets the log level of the log identified by a qualified `<classname>` in the daemon running at `<host:httpport>`. This command internally connects to `http://<host:httpport>/logLevel?log=<classname>&level=<level>` |

Get/Set the log level for a Log identified by a qualified class name in the daemon.

Example: `$ bin/yarn daemonlog -setlevel 127.0.0.1:8088 org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMAppImpl DEBUG`

### `nodemanager`

Usage: `yarn nodemanager`

Start the NodeManager

### `proxyserver`

Usage: `yarn proxyserver`

Start the web proxy server

### `resourcemanager`

Usage: `yarn resourcemanager [-format-state-store]`

| COMMAND\_OPTIONS | Description |
|:---- |:---- |
| -format-state-store | Formats the RMStateStore. This will clear the RMStateStore and is useful if past applications are no longer needed. This should be run only when the ResourceManager is not running. |

Start the ResourceManager

### `rmadmin`

Usage:

```
  yarn rmadmin [-refreshQueues]
               [-refreshNodes]
               [-refreshUserToGroupsMapping] 
               [-refreshSuperUserGroupsConfiguration]
               [-refreshAdminAcls] 
               [-refreshServiceAcl]
               [-getGroups [username]]
               [-transitionToActive [--forceactive] [--forcemanual] <serviceId>]
               [-transitionToStandby [--forcemanual] <serviceId>]
               [-failover [--forcefence] [--forceactive] <serviceId1> <serviceId2>]
               [-getServiceState <serviceId>]
               [-checkHealth <serviceId>]
               [-help [cmd]]
```

| COMMAND\_OPTIONS | Description |
|:---- |:---- |
| -refreshQueues | Reload the queues' acls, states and scheduler specific properties. ResourceManager will reload the mapred-queues configuration file. |
| -refreshNodes | Refresh the hosts information at the ResourceManager. |
| -refreshUserToGroupsMappings | Refresh user-to-groups mappings. |
| -refreshSuperUserGroupsConfiguration | Refresh superuser proxy groups mappings. |
| -refreshAdminAcls | Refresh acls for administration of ResourceManager |
| -refreshServiceAcl | Reload the service-level authorization policy file ResourceManager will reload the authorization policy file. |
| -getGroups [username] | Get groups the specified user belongs to. |
| -transitionToActive [--forceactive] [--forcemanual] \<serviceId\> | Transitions the service into Active state. Try to make the target active without checking that there is no active node if the --forceactive option is used. This command can not be used if automatic failover is enabled. Though you can override this by --forcemanual option, you need caution. |
| -transitionToStandby [--forcemanual] \<serviceId\> | Transitions the service into Standby state. This command can not be used if automatic failover is enabled. Though you can override this by --forcemanual option, you need caution. |
| -failover [--forceactive] \<serviceId1\> \<serviceId2\> | Initiate a failover from serviceId1 to serviceId2. Try to failover to the target service even if it is not ready if the --forceactive option is used. This command can not be used if automatic failover is enabled. |
| -getServiceState \<serviceId\> | Returns the state of the service. |
| -checkHealth \<serviceId\> | Requests that the service perform a health check. The RMAdmin tool will exit with a non-zero exit code if the check fails. |
| -help [cmd] | Displays help for the given command or all commands if none is specified. |

Runs ResourceManager admin client

### scmadmin

Usage: `yarn scmadmin [options] `

| COMMAND\_OPTIONS | Description |
|:---- |:---- |
| -help | Help |
| -runCleanerTask | Runs the cleaner task |

Runs Shared Cache Manager admin client

### sharedcachemanager

Usage: `yarn sharedcachemanager`

Start the Shared Cache Manager

### timelineserver

Usage: `yarn timelineserver`

Start the TimeLineServer

Files
-----

| File | Description |
|:---- |:---- |
| etc/hadoop/hadoop-env.sh | This file stores the global settings used by all Hadoop shell commands. |
| etc/hadoop/yarn-env.sh | This file stores overrides used by all YARN shell commands. |
| etc/hadoop/hadoop-user-functions.sh | This file allows for advanced users to override some shell functionality. |
| ~/.hadooprc | This stores the personal environment for an individual user. It is processed after the `hadoop-env.sh`, `hadoop-user-functions.sh`, and `yarn-env.sh` files and can contain the same settings. |