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.
  - Monitoring Using MCS and the CLI
    - Setting the Refresh Rate in the MapR Control System
    - Monitoring the Cluster
    - Monitoring Nodes
    - Monitoring YARN
    - Monitoring Volumes
    - Monitoring Tables
    - Monitoring Streams
      The speed at which messages flow from producers to partitions and from partitions to consumers depends on the performance of your producers, the cluster nodes hosting partitions, and your consumers.
    - Monitoring Alarms
    - Monitoring Errors
  - Using MapR Monitoring (Spyglass Initiative)
    MapR Monitoring (part of the Spyglass initiative) provides the ability to collect, store, and view metrics and logs for nodes, services, and jobs/applications.
- 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

Viewing Active Table Replication Alarms

About this task

You can view table replication alarms using MCS, the log files, and the CLI.

Viewing Active Table Alarms in the MapR Control System

Procedure

Log in to MCS and:

Click Data > Tables to view table replication alarms in the Active Alarms pane.
Go to the Summary tab in the table information page to view the recent and active alarms for the selected table in the Active Alarms pane.

You can:

View information related to the alarm.
Dismiss an alarm.
Mute an alarm.

See Table-Replication Alarms for more information on the table alarms.

Retrieving Active Table Replication Alarms Using the CLI or REST API

About this task

Alarms for replication are issued per volume rather than per source table. To retrieve table replication alarms, run the following command:

maprcli alarm list -cluster <cluster name> -type volume

For complete reference information, see alarm list.

Viewing Table Replication Alarms in the Log Files

About this task

The log files mfs.log-5 and cldb.log display these alarms. These files are located in the /opt/mapr/logs directory.