MapR 5.2 is at End of Life (EOL) and no longer supported. Please see the latest documentation. This documentation is not being updated.

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5.2 Cluster Administration
This section contains information on administering the cluster and MapR-DB, configuring Gateways, and configuring and managing particular aspects of the MapR security infrastructure.
Administering MapR-DB
Administration of the MapR-DB is done primarily via the commmand line (maprcli) or with the MapR Control System (MCS). Regardless of whether the MapR-DB table is used for binary files or JSON documents, the same types of commands are used with slightly different parameter options. MapR-DB administration is associated with tables, columns and column families, and table regions.
Administering Table Regions
This section covers the advanced topics about the tasks of administering table regions.

MapR 5.2 Documentation

5.2 Cluster Administration
This section contains information on administering the cluster and MapR-DB, configuring Gateways, and configuring and managing particular aspects of the MapR security infrastructure.
- Administering the Cluster
  This section describes how to manage the nodes and services that make up a cluster.
- Monitoring the Cluster
  This section describes how to monitor the health and performance of a MapR cluster.
- Configuring and Managing MapR Gateways
  A MapR gateway mediates one-way communication between a source MapR cluster and a destination cluster. MapR-DB tables and MapR Streams streams can be replicated.
- Administering MapR-DB
  Administration of the MapR-DB is done primarily via the commmand line (maprcli) or with the MapR Control System (MCS). Regardless of whether the MapR-DB table is used for binary files or JSON documents, the same types of commands are used with slightly different parameter options. MapR-DB administration is associated with tables, columns and column families, and table regions.
  - Administering Tables
    MapR-DB 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.
  - Administering 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.
  - Administering Table Regions
    This section covers the advanced topics about the tasks of administering table regions.
    - Displaying the Number of Regions of a Table
      Use either a maprcli command or MCS to display the number of regions of a table.
    - Displaying the Region Size of a Table
      Use either a maprcli command or MCS to display the maximum size in bytes of the regions for a MapR-DB table.
    - Enabling or Disabling Autosplitting
      Use a maprcli command or MCS to enable or disable the splitting of a table into regions automatically as the table grows.
    - Finding Out Whether Autosplitting is Enabled or Disabled for a Table
      Use a maprcli command or MCS to find out whether regions are created automatically for a table as that table grows.
    - Listing Table Regions
      Use a maprcli command or MCS to list the regions in which a table's data is located.
    - Merging, Packing, and Splitting Table Regions
      You can use maprcli commands to mege, pack, and split table regions.
    - Setting the Maximum Region Size for Tables
      When you are creating a table, you can set the maximum size in MB for the regions of that table.
  - Language Support for MapR-DB Tables
    This section lists the human languages that MapR-DB tables can store, retrieve, and process.
- Configuring Security
  Describes tasks for configuring MapR security, managing secure clusters, and administering auditing.
- Administrator's Reference
  This section contains in-depth reference information for the administrator.
- Glossary
  This section contains defintions for commonly used terms in MapR Converged Data Platform environments.

Administering Table Regions

This section covers the advanced topics about the tasks of administering table regions.

A table region contains the data for a range of rowkeys in a table. Regions, also refered to as tablets, can be from 4 to 6 GB in size. MapR-DB provides maprcli commands for listing the regions of a table and for overriding MapR-DB's automatic maintenance of regions.