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.
- 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
  - Managing Streams
    This topic provides information about managing streams in HPE Ezmeral Data Fabric Streams.
    - Creating a Stream
      Explains how to create a stream using the Control System and the CLI.
    - Editing a Stream
      Describes how to edit streams using the Control System and the CLI.
    - Encrypting a Stream
      Apply an additional layer of security to streams by encrypting them.
    - Defining ACEs Using the Access Control Expression Builder
      Describes how to build ACEs using the Expression Builder.
    - Removing Streams
      Explains how to delete a stream using either the Control System or the CLI.
    - Viewing a List of Streams
      Describes how to view the list of streams using the Control System.
    - Viewing Stream Information
      Explains how to view stream information including stream properties, topics, and replication settings using the Control System and the CLI.
  - Managing Topics
    Topics are logical collections of messages. The following sections describe how to create and manage topics.
  - Managing Stream Replication
    This section contains topics about setting up stream replication and administering existing replicas.
  - Preparing Clusters for Log Compaction
    Describes how to prepare your environment so you can use log compaction.
  - Mirroring Topics with Apache Kafka MirrorMaker
    Use the Apache Kafka MirrorMaker utility either to mirror topics that are in Apache Kafka clusters to streams that are in HPE Ezmeral Data Fabric clusters or to Mirror topics that are in HPE Ezmeral Data Fabric clusters to Apache Kafka clusters.
  - Mirroring Topics with HPE Ezmeral Data Fabric MirrorMaker 2
    MirrorMaker 2.0 is a multi-cluster, cross-data-center replication engine based on the Kafka Connect framework. MirrorMaker 2 is available starting in EEP 8.0.0.
- 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 Stream Information

Explains how to view stream information including stream properties, topics, and replication settings using the Control System and the CLI.

Viewing Stream Information Using the Control System

About this task

To view stream information:

Procedure

Log in to the Control System and click Data > Streams.
NOTE This option is not available in the Kubernetes version of the Control System.
Locate the stream (by searching or browsing the volumes or by entering the full path to the stream) and click on the stream name.
The stream information page displays the following tabs:
- Summary
- Topics
- Replication
You can:
- Modify the stream
- Remove the stream
The Summary tab displays:
- The active and recent alarms in the Alarms pane.
- The stream settings and permissions in the Detail pane.

Retrieving Stream Information Using the CLI or REST API

About this task

The basic command to retrieve stream information is:

maprcli stream info -path <Stream Path>

To run this command, your user ID must have the following permissions:

readAce on the volume
lookupdir on directories in the path
adminperm

When a user with this permission runs the command, the output includes the access-control expressions for the adminperm and topicperm permissions.

produceperm, consumeperm, or topicperm

When a user with one of these permissions runs the command, the output does not include any access-control expressions.

For complete reference information, see stream info.