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.
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.
- Application Development Process
  Before you start developing applications on the MapR Data Platform platform, consider how you will get the data into the platform, the storage format of the data, the type of processing or modeling that is required, and how the data will be accessed.
- MapR XD and Apps
  The following sections provide information about accessing the MapR XD with C and Java applications.
- MapR Database and Apps
  This section contains information about developing client applications for JSON and key-value tables.
- MapR Event Store For Apache Kafka and Apps
  MapR Event Store For Apache Kafka brings integrated publish and subscribe messaging to MapR Data Platform.
- MapReduce and Apps
  This section contains information associated with developing YARN applications.
- MapR Data Science Refinery
  The MapR Data Science Refinery product is an easy-to-deploy and scalable data science toolkit with native access to all platform assets and superior out-of-the-box security.
- MapR Data Fabric for Kubernetes
  This section describes how to leverage the capabilities of the MapR Data Fabric for Kubernetes.
- Ecosystem Components
  The following sections provide information about each open-source project that is supported by the MapR Data Platform.
  - Ezmeral Ecosystem Packs
  - AsyncHBase
  - Cascading
  - Apache Drill
  - Flume
  - HBase
  - HBase Client and MapR Database Binary Tables
  - HCatalog
  - Hive
  - HttpFS
  - Hue
  - Impala
  - Livy
    Apache Livy is primarily used to provide integration between Hue and Spark.
  - MapR Event Store For Apache Kafka Clients and Tools
    Describes the supported MapR Event Store For Apache Kafka tools and clients.
  - S3 Gateway
    The S3 gateway is a service that provides an S3-compatible interface to expose data in MapR Data Platform as objects. The S3 gateway manages all inbound S3 API requests to put data into and get data out of cloud storage.
  - Myriad
  - Oozie
  - Pig
  - Sentry
  - Apache Spark
  - Sqoop
  - YARN
  - Zeppelin
- Maven and MapR
  This section discusses topics associated with Maven and MapR.
- Developer's Reference
  This section contains in-depth information for the developer.
- API Documentation
  MapR Data Platform supports public APIs for MapR File System, MapR Database, and MapR Event Store For Apache Kafka. These APIs are available for application-development purposes.
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.

Step 1: Set up a Kerberos Principal and keytab File

Each node running the HttpFS service must have a keytab file (/opt/mapr/conf/mapr.keytab) and these two principals:

HTTP/<fully.qualified.domain.name>
mapr/<fully.qualified.domain.name>

NOTE For complete instructions on generating a Kerberos principal and keytab file, see Configuring Kerberos.

To check whether the keytab already exists, and if it contains the two necessary principals, run the klist command with the -k (keytab keys), -e (encryption type) and -t (timestamp) options:

$ klist -ket /opt/mapr/conf/mapr.keytab

The output from this command displays the following information:

KVNO (key version number)
Timestamp (the time the key was generated)
Principal names
Encryption types

If the keytab file does not exist, or does not contain both principals, generate them by following these steps:

Generate a Kerberos principal for the mapr user. The principal is of the form mapr/<fully.qualified.domain.name>@<your-realm>.com, where <fully.qualified.domain.name> is unique for each HttpFS node. In the following example, perfnode153.perf.lab@dev-maprtech.com is used for the <fully.qualified.domain.name>@<your-realm>.com.
```
$ kadmin
kadmin: addprinc -randkey mapr/perfnode153.perf.lab@dev-maprtech.com
```
Generate a Kerberos principal for HTTP/<fully.qualified.domain.name>. This is required for Kerberos authentication of the HttpFS server using HTTP SPNEGO.
```
$ kadmin
kadmin: addprinc -randkey HTTP/perfnode153.perf.lab@dev-maprtech.com
```
If the current node does not already have a keytab file created for another service, create one and name it mapr.keytab. Note that each node references the same keytab file (usually located at /opt/mapr/conf/mapr.keytab), and each keytab file can have multiple principals.
```
kadmin: ktadd -k /opt/mapr/conf/mapr.keytab mapr/perfnode153.perf.lab
```
Change the owner of the keytab file from the root user (the default) to the mapr user.
```
$ chown mapr:mapr /opt/mapr/conf/mapr.keytab
```

Set read-only permissions on the mapr.keytab file.

$ chmod 600 mapr:mapr /opt/mapr/conf/mapr.keytab