HPE Ezmeral Data Fabric 6.2 is In Maintenance and transitions to "End of Maintenance" in June 2024. Please see the latest documentation.

About Release 6.2
This site contains documentation for HPE Ezmeral Data Fabric release 6.2 including installation, configuration, administration, and reference content, as well as content for the associated bundled ecosystem components and drivers.
6.2 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.
6.2 Data Fabric
HPE Ezmeral Data Fabric is the industry-leading data platform for AI and analytics that solves enterprise business needs.
6.2 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.
  - Managing Data with Volumes
    Provides an overview of how to manage volume data.
  - Managing Snapshots
    This section provide information about managing snapshots.
    - Associating a Snapshot Schedule with a Volume
      Explains how to associate a snapshot schedule with a volume using the Control System, the CLI, or the REST API.
    - Creating Volume Snapshots
      Describes how to create snapshots of volumes using the Control System and the CLI.
    - Viewing the list of Snapshots
      Describes how to view the list of snapshots that are present on a cluster, using the Control System or the CLI.
    - Filtering the List of Snapshots
      Describes how to filter the list of snapshots using the Control System or the CLI.
    - Viewing the Contents of a Snapshot from the Command Line
      Describes how to view the contents of the .snapshot directory from the CLI.
    - Preserving one or more Snapshots
      Describes how to preserve a snapshot using the volume snapshot preserve command, or using the Control System.
    - Removing one or more Snapshots
      Explains how to remove a snapshot using the volume snapshot remove command or using the Control System.
    - Restoring Volume Snapshots Using the Control System
      Describes how to restore snapshots of volumes using the Control System.
    - Copying From a Snapshot Using the CLI
      Describes how to create a volume by copying data from a snapshot
  - Managing User Disk Usage
  - Managing Schedules
  - Managing Tiers
  - Managing Storage Policies
  - Using Storage Labels
    Describes the Storage Labels feature.
- 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
- 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.
6.2 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.

Viewing the Contents of a Snapshot from the Command Line

Describes how to view the contents of the .snapshot directory from the CLI.

At the top level of each volume is a directory named .snapshot containing all the snapshots for the volume. You can view the directory with hadoop fs commands or by mounting the cluster with NFS. To prevent recursion problems, ls and hadoop fs -ls do not show the .snapshot directory when you list the contents of the top-level volume directory. You must navigate explicitly to the .snapshot directory to view and list the snapshots for the volume.

Example:

hadoop fs -ls /myvol/.snapshot
   Found 1 items
   drwxrwxrwx   - root root          1 2011-06-01 09:57 /myvol/.snapshot/2011-06-01.09-57-49

In the preceding example, /myvol is the mount point of the volume for which the snapshot named 2011-06-01.09-57-49 was created and stored in the .snapshot directory.