MapReduce CLI
All MapReduce commands are called by the bin/mapred script. Running the mapred script without any arguments prints the description for all commands.
The script usage is as follows:
$ mapred [SHELL_OPTIONS] COMMAND [GENERIC_OPTIONS] [COMMAND_OPTIONS]Hadoop 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 |
GENERIC_OPTIONS |
The common set of options supported by multiple commands |
COMMAND_OPTIONS |
Various commands with their options |
User commands
| Command | Description |
|---|---|
Creates a Hadoop archive |
|
Combines YARN logs into Hadoop archives |
|
Prints the classpath |
|
Used for inter/intra-cluster copying of large files and directories |
|
Used to work with MapReduce jobs |
|
Runs a pipe job |
|
Allows users to interact with queues and to view job queue information |
|
Prints the version |
|
Displays computed Hadoop environment variables |