About Release 7.0
This site contains documentation for HPE Ezmeral Data Fabric release 7.0, including installation, configuration, administration, and reference content, as well as content for the associated ecosystem components and drivers.
7.0 Installation
This section contains information about installing and upgrading HPE Ezmeral Data Fabric software. It also contains information about how to migrate data and applications from an Apache Hadoop cluster to a HPE Ezmeral Data Fabric cluster.
7.0 Data Fabric
HPE Ezmeral Data Fabric is the industry-leading data platform for AI and analytics that solves enterprise business needs.
7.0 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 data-fabric 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 HPE Ezmeral Data Fabric clusters.
- Administering Files and Directories
- Administering Tables
  Administration of the HPE Ezmeral Data Fabric Database is done primarily via the command line (maprcli) or with the Managed Control System (MCS). Regardless of whether the HPE Ezmeral Data Fabric Database table is used for binary files or JSON documents, the same types of commands are used with slightly different parameter options. HPE Ezmeral Data Fabric Database administration is associated with tables, columns and column families, and table regions.
- Administering Streams
- Administering Data Fabric Gateways
  A HPE Ezmeral Data Fabric gateway mediates one-way communication between a source HPE Ezmeral Data Fabric cluster and a destination cluster. You can replicate HPE Ezmeral Data Fabric Database tables (binary and JSON) and HPE Ezmeral Data Fabric Streams streams. HPE Ezmeral Data Fabric gateways also apply updates from JSON tables to their secondary indexes and propagate Change Data Capture (CDC) logs.
- Administering Services
  - Managing Services
    Synopsis on managing services.
  - Viewing CLDB Information
    Describes how to view CLDB information from the CLDB page, and provides an explanation of each field that the page displays.
  - Listing CLDB Nodes
    Describes how to list CLDB nodes in the HPE Ezmeral Data Fabric.
  - Managing Drill
    Provides a short description on managing Drill services.
  - Managing the HPE Ezmeral Data Fabric NFS Service
    Provides an overview of managing the NFS for the HPE Ezmeral Data Fabric service on a licensed cluster.
  - Managing HPE Ezmeral Data Fabric POSIX Clients
    Provides a brief synopsis of HPE Ezmeral Data Fabric POSIX clients.
    - HPE Ezmeral Data Fabric loopbacknfs POSIX Client
      Explains the differences between the HPE Ezmeral Data Fabric POSIX client and the Linux native NFS client.
    - HPE Ezmeral Data Fabric FUSE-Based POSIX Client
      Provides a brief description of the FUSE-based POSIX client.
      - Example of Mounting FUSE
        This example shows you how to mount FUSE and perform operations as a regular user.
      - Configuring the HPE Ezmeral Data Fabric FUSE-Based POSIX Client
        Lists FUSE configuration parameters.
      - Managing the FUSE-Based POSIX Client
        Describes how to use the FUSE-based POSIX client.
      - Troubleshooting the FUSE-Based POSIX Client
        Explains how to enable and collect the stack trace to troubleshoot POSIX client issues.
  - Managing the MAST Gateway
  - Configuring YARN for Control Groups
    Control groups (cgroups) are a Linux kernel feature available through the LinuxContainerExecutor program that you can configure to limit and monitor the CPU resources available to YARN container processes on a node.
  - Configuring NodeManager Restart
  - Managing Jobs and Applications
- 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.
- Managing Secure Clusters
  Provides procedures that will enable you to use MapR clusters securely.
- Administering the Data Access Gateway
  The HPE Ezmeral Data Fabric Data Access Gateway is a service that acts as a proxy and gateway for translating requests between lightweight client applications and the HPE Ezmeral Data Fabric 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 HPE Ezmeral Data Fabric Information
  Lists the best practices and performance considerations to follow when backing up HPE Ezmeral Data Fabric information.
7.0 Development
This section contains information related to application development for Ezmeral ecosystem components and HPE Ezmeral Data Fabric products, including the file system, Database (Key-Value and JSON), and Event Streams.
Other Docs
This section contains release-independent information, including: Installer documentation, Ecosystem release notes, interoperability matrices, security vulnerabilities, and links to other data-fabric version documentation.
Glossary
Definitions for commonly used terms in MapR Converged Data Platform environments.

HPE Ezmeral Data Fabric FUSE-Based POSIX Client

Provides a brief description of the FUSE-based POSIX client.

The HPE Ezmeral Data Fabric FUSE-based POSIX client (either mapr-posix-client-basic or mapr-posix-client-platinum) allows app servers, web servers, and other client nodes and apps to read and write data directly and securely to a HPE Ezmeral Data Fabric cluster like a Linux filesystem.

The same HPE Ezmeral Data Fabric client can access both secure and nonsecure clusters; however, a HPE Ezmeral Data Fabric client that is configured to access a secure cluster can access a nonsecure cluster only if these conditions are met:

The secure cluster must be listed in the mapr-clusters.conf file.
A user must obtain a ticket for the secure cluster even if the user wants to access only the nonsecure cluster.

The FUSE-based HPE Ezmeral Data Fabric POSIX client runs as a userspace process to connect to one or more HPE Ezmeral Data Fabric clusters. The necessary FUSE (Filesystem in Userspace) library (libfuse) is bundled with the POSIX client package. With the installation of the POSIX client package, the HPE Ezmeral Data Fabric POSIX client performs operations such as read and write on the filesystem exposed by FUSE. The following diagram illustrates how the HPE Ezmeral Data Fabric FUSE-based POSIX client works.