Configuring Users That Run Tasks

This section applies to clusters of MRS 3.x or later.

Scenario

Currently, YARN allows the user that starts the NodeManager to run the task submitted by all other users, or the users to run the task submitted by themselves.

Configuration Description

On Manager, choose Cluster > Name of the desired cluster > Services > Yarn > Configurations. Click All Configurations Enter a parameter name in the search box.

**Table 1** Parameter description
Parameter	Description	Default Value
yarn.nodemanager.linux-container-executor.user	Indicates the user who runs a task.	The value is left blank by default. NOTE: The value is left blank by default. The user who submits a task is the actual person who runs the task.
yarn.nodemanager.container-executor.class	Indicates the executor who starts a task.	org.apache.hadoop.yarn.server.nodemanager.EnhancedLinuxContainerExecutor

Set yarn.nodemanager.linux-container-executor.user to configure the user who runs the container. This parameter is left blank by default. The user who submits the task is the person who runs the container. This parameter is valid only when yarn.nodemanager.container-executor.class is set to org.apache.hadoop.yarn.server.nodemanager.EnhancedLinuxContainerExecutor.
In non-security mode, if yarn.nodemanager.linux-container-executor.user is set to omm, yarn.nodemanager.linux-container-executor.nonsecure-mode.local-user must also be set to omm.
For security reasons, it is advised to retain the default values of yarn.nodemanager.linux-container-executor.user and yarn.nodemanager.container-executor.class.