HPE Ezmeral Data Fabric 6.1.x is In Maintenance and transitions to "End of Maintenance" in June 2024. Please see the latest documentation.

About MapR 6.1
This site contains the main documentation for Version 6.1 of the MapR Converged Data Platform, including installation, configuration, administration, and reference information.
6.1 Installation
This section contains information about installing and upgrading MapR software. It also contains information about how to migrate data and applications from an Apache Hadoop cluster to a MapR cluster.
6.1 MapR Data Platform
MapR Data Platform is the industry-leading data platform for AI and analytics that solves enterprise business needs.
6.1 Administration
This section describes how to manage the nodes and services that make up a cluster.
- Administering Users and Clusters
  Lists topics that help manage a MapR cluster.
- Administering Nodes
  Provides a synopsis of managing nodes in a cluster.
- Administering Volumes
  This section provide information about how to organize and manage data using volumes, a unique feature of MapR clusters.
- Administering Files and Directories
- Administering Tables
  Administration of the MapR Database is done primarily via the command line (maprcli) or with the Managed Control System (MCS). Regardless of whether the MapR Database table is used for binary files or JSON documents, the same types of commands are used with slightly different parameter options. MapR Database administration is associated with tables, columns and column families, and table regions.
- Administering Streams
- Administering MapR Gateways
  A MapR gateway mediates one-way communication between a source MapR cluster and a destination cluster. You can replicate MapR Database tables (binary and JSON) and MapR Event Store For Apache Kafka streams. MapR gateways also apply updates from JSON tables to their secondary indexes and propagate Change Data Capture (CDC) logs.
- Administering Services
- Monitoring the Cluster
  This section describes how to monitor the health and performance of a MapR cluster.
- Configuring Security
  Describes how to configure security and manage secure clusters.
  - Configuring Data-Fabric Security
    Provides usage information for frequently used security functionality, including Access Control Lists (ACLs), Access Control Expressions (ACEs), file permissions, and subnet whitelisting.
  - Managing Impersonation
    Provides instructions for enabling and using MapR impersonation features.
    - How Impersonation Works
      Introduces impersonation functionality, limitations, and core requirements.
    - Enabling Impersonation for the MapR Superuser
      Provides a procedure necessary to implement superuser impersonation.
    - Enabling Impersonation for any User
      Provides the procedure necessary to implement impersonation for any MapR user.
    - Configuring Impersonation without Cluster Security
      Describes how to use impersonation on a non-secure cluster.
    - Resolving Username with UID and GIDs During Impersonation
      Lists parameters for configuring impersonation.
- Managing Secure Clusters
  Provides procedures that will enable you to use MapR clusters securely.
- Administering the MapR Data Access Gateway
  The MapR Data Access Gateway is a service that acts as a proxy and gateway for translating requests between lightweight client applications and the MapR cluster. This section describes considerations when upgrading the service, how to modify configuration settings, and how to administer and manage the service.
- Planning for High Availability
- Administrator's Reference
  This section contains in-depth reference information for the administrator.
- Troubleshooting Cluster Administration
  Lists the common errors and their solutions.
- Best Practices for Backing Up MapR Information
  Lists the best practices and performance considerations to follow when backing up MapR information.
6.1 Development
This section contains information related to application development for Ezmeral ecosystem components and MapR Data Platform products, including the file system, Database (Key-Value and JSON), and Event Streams.
Other Docs
This section contains release-independent information, including: MapR Installer documentation, Ecosystem release notes, interoperability matrices, security vulnerabilities, and links to other MapR version documentation.
Glossary
Definitions for commonly used terms in MapR Converged Data Platform environments.

Enabling Impersonation for the MapR Superuser

Provides a procedure necessary to implement superuser impersonation.

About this task

To enable impersonation in your MapR installation:

Procedure

Open the following file in a text editor:

/opt/mapr/hadoop/hadoop-<version>/etc/hadoop/core-site.xml

Add the following hadoop.proxyuser properties:
```
<property>
        <name>hadoop.proxyuser.mapr.hosts</name>
        <value>*</value>
</property><property>
        <name>hadoop.proxyuser.mapr.groups</name>
        <value>*</value>
</property>
```
The hosts setting (*) allows the mapr superuser to connect from any host to impersonate a user.

The groups setting (*) allows the mapr superuser to impersonate any user in any group.

NOTE Do not use anything other than a single asterisk here. Other parts of MapR ignore the values here and treat them as if each is set to a single asterisk.
Close the file, saving any changes that you made.