MapR 5.1 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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5.1 DB & Streams
This section covers the MapR-DB, MapR-Streams, and MapR-Gateways features. Each feature may contain both administrator and developer topics.
MapR-DB
Architecture of MapR-DB
MapR-DB's architecture gives it a large of advantages over other NoSQL databases.
Containers are stored in volumes in MapR-FS
MapR provides volumes as a way to organize data and manage cluster performance. A volume is a logical unit that allows you to apply policies to a set of files, directories, and tables. Volumes are used to enforce disk usage limits, set replication levels, define snapshots and mirrors, and establish ownership and accountability.

MapR 5.1 Documentation

5.1 DB & Streams
This section covers the MapR-DB, MapR-Streams, and MapR-Gateways features. Each feature may contain both administrator and developer topics.
- MapR-DB
  - Architecture of MapR-DB
    MapR-DB's architecture gives it a large of advantages over other NoSQL databases.
    - MapR-DB operates directly on the file system
      MapR-DB tables are implemented directly in the MapR file system (MapR-FS).
    - Tablets are stored in containers in MapR-FS
    - Containers are stored in volumes in MapR-FS
      MapR provides volumes as a way to organize data and manage cluster performance. A volume is a logical unit that allows you to apply policies to a set of files, directories, and tables. Volumes are used to enforce disk usage limits, set replication levels, define snapshots and mirrors, and establish ownership and accountability.
  - Performance Enhancements for SSD Based MapR-DB Deployments
  - MapR-DB as a Document Database
    MapR-DB supports OJAI documents as a native data store. OJAI documents are stored in a compact binary format, not as plain ASCII text.
  - MapR-DB as a Wide-Column Database
- MapR Streams
  MapR Streams brings integrated publish/subscribe messaging to the MapR Converged Data Platform.
- MapR Gateways
  A MapR gateway mediates one-way communication between a source MapR cluster and a destination cluster. MapR-DB binary tables and MapR Streams streams can be replicated.

Containers are stored in volumes in MapR-FS

MapR provides volumes as a way to organize data and manage cluster performance. A volume is a logical unit that allows you to apply policies to a set of files, directories, and tables. Volumes are used to enforce disk usage limits, set replication levels, define snapshots and mirrors, and establish ownership and accountability.

There are several advantages to storing table containers in volumes: