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.
  - Managing Tables
    MapR Database supports two types of table: binary tables and JSON tables. This section covers how to create, edit, and delete tables, as well as how to set parameter values, display parameter values, grant permissions and access, replicate tables, and more using the Control System and the CLI.
  - Managing Column Families and Columns
    This section covers overviews of column families in binary tables and JSON tables, how to create column families, alter them, delete them, set permissions on them, and set and display parameter values.
  - Managing Table Replication
    This section contains topics about setting up table replication and administering existing replicas.
    - Preparing Clusters for Table Replication
      Preparing clusters for table replication includes configuring gateways on destination clusters, configuring the mapr-clusters.conf file on the source cluster, and, if the clusters are secure, setting up secure communications between the clusters. After you prepare the clusters for table replication, you can setup replication between tables.
    - Setting Up Table Replication Using the CLI
      You can run the maprcli table replica autosetup command to set up primary-secondary or multi-master replication from an existing source table.
    - Adding Table Replicas
      Explains how to add table replicas using either the Control System, the CLI or the REST API.
    - Displaying the List of Table Replicas
      Describes how to view information on the table replicas using the Control System or the CLI.
    - Modifying Table Replica
      Explains how to edit the properties of a replica using the Control System and the CLI.
    - Removing Table Replicas
      Explains how to un-register one or more replicas using either the Control System or the CLI.
    - Pausing Table Replication
      Explains how to pause table replication of data from a source MapR Database binary or JSON table to a replica MapR Database binary or JSON table respectively using either the Control System or the CLI.
    - Resuming Table Replication
      Explains how to resume replication between a source MapR Database binary or JSON table and a replica of that table when the replication state is set to paused from the Control System or by the maprcli table replica add or the maprcli table replica pause command.
    - Adding a Column Family to a Replica
      Changes to the structure of a source table are not automatically replicated to replica table. You must complete the following steps to add a column family to a replica.
    - Viewing Active Table Replication Alarms
      Describes how to view active table replication alarms using the Control System and the CLI.
    - Managing Upstream Source for Table Replicas
  - Managing Secondary Indexes
    Describes how to manage secondary indexes, including adding, deleting, and listing indexes, setting up your cluster for querying, and troubleshooting index usage.
  - Administering Change Data Capture
    This topic covers the Control System and maprcli tools for managing the Change Data Capture (CDC) feature.
  - Indexing MapR Database Binary Tables with Elasticsearch
    As of with MapR 6.0, MapR Database Elastic Search integration capability is deprecated and no longer available in the MapR Database product.
- 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.
- 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.

Displaying the List of Table Replicas

Describes how to view information on the table replicas using the Control System or the CLI.

Displaying the List of Table Replicas Using the Control System

About this task

To view table replicas:

Procedure

Log in to the Control System and go to the table information page.

Click Replication.

The page displays all the replicas and for each replica, the pane displays the following statistics:

Column Name	Column Description
Paused	Whether replication is paused.
Destination Cluster	The cluster on which the replica resides.
Destination Path	The path to the destination.
Up to Date	Whether replica is up-to-date. Data may not be up-to-date for the following reasons: Data Pending — Indicates the amount of data that is yet to be replicated to the replica. Puts Pending — Indicates the number of puts that are yet to be replicated to the replica. Bytes Pending — Indicates the number of bytes that are yet to be replicated to the replica.
Earliest	The epoch time in milliseconds of the oldest operation that is yet to be replicated to the replica.
Latest	The epoch time in milliseconds of the newest operation that is yet to be replicated to the replica.
Errors	Error () information, if any.
Compression Type	The type of on-wire compression.
Synchronous	Whether replication is synchronous or asynchronous.
Throttled	Whether replication is throttled.
Encrypted	Whether replication is encrypted.

Retrieving List of Table Replicas Using the CLI or the REST API

About this task

To view table replicas and associated replica statistics for a table, run the following command:

maprcli table replica list -path <table-path>

For more information, see table replica list