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6.0 Administration
This section describes how to manage the nodes and services that make up a cluster.
Administering Volumes
This section provide information about how to organize and manage data using volumes, a unique feature of MapR clusters.
Managing Data with Volumes
Working with Mirror Volumes
Starting the Mirror

MapR 6.0 Documentation

6.0 Administration
This section describes how to manage the nodes and services that make up a cluster.
- Administering Users and Clusters
- Administering Nodes
- 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-DB is done primarily via the command 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 Streams
- Administering MapR Gateways
  A MapR gateway mediates one-way communication between a source MapR cluster and a destination cluster. You can replicate MapR-DB tables (binary and JSON) and MapR-ES 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 MapR 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
- Best Practices for Backing Up MapR Information

Starting the Mirror

About this task

You can start mirroring through MCS and using the CLI.

When a mirror starts, all the data in the source volume is copied into the mirror volume. Starting a mirroring operation requires the mirror volume to exist and be associated with a source. After you start a mirror, synchronize it with the source volume regularly to keep the mirror current.

NOTE: The getIPTypeForCluster method in CLDBRpcCommonUtils is unable to determine whether the IP type is internal or external, if mapr-clusters.conf contains both internal and external IPs. The fix is to only put in the internal IP in mapr-clusters.conf and keep the external IP in the env.sh file, before starting the mirror.

Starting the Mirror for Multiple Mirror Volumes Using the MapR Control System

About this task

To start mirroring, in the Summary tab under Data > Volumes:

Procedure

Select the mirror volume(s) to synchronize.
You cannot start mirror for:
- Standard volumes
- Mirror volumes currently mirroring
Select Start Mirroring from the Actions dropdown menu.
The Start Mirroring Volume(s) confirmation dialog displays.
Verify the list of volumes to synchronize and click Start Mirroring.
When a mirror is started, the mirror volume is synchronized from a hidden internal snapshot so that the mirroring process is not affected by any concurrent changes to the source volume. The changes to the mirror volume occur atomically at the end of the mirroring process; deltas transmitted from the source volume do not appear until mirroring is complete.

Starting the Mirror for a Mirror Volume Using the MapR Control System

About this task

To start mirroring:

Procedure

Go to the volume information page for the mirror volume to synchronize.
Select Start Mirroring from the Select Action dropdown menu.
The Start Mirroring Volume confirmation dialog displays.
Click Start Mirroring.
When a mirror is started, the mirror volume is synchronized from a hidden internal snapshot so that the mirroring process is not affected by any concurrent changes to the source volume. The changes to the mirror volume occur atomically at the end of the mirroring process; deltas transmitted from the source volume do not appear until mirroring is complete.

Starting the Mirror Using the CLI or REST API

About this task

The basic command to start a mirror is:

maprcli volume mirror start -name <volume name>

For complete reference information, see volume mirror start.

(Topic last modified: 2018-11-19)