Specifying the User Who Runs Yarn Tasks

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

Scenario

Yarn allows the user who starts NodeManager to run tasks submitted by all users, and also allows the user who submits a task to run it.

Configuration Description

Log in to Manager, choose Cluster > Services > Yarn and click Configurations then 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. An empty value (default value) indicates that the user running the container is also the one submitting the task. 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.