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6.0 Administration
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.
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.
Metric Visualization
Use dashboards to visualize the metrics across multiple nodes and clusters.
Update the OpenTSDB Data Source For Grafana
Grafana connects to a single OpenTSDB node to read metrics. In the event that Grafana is unable to read metrics due to the failure of an OpenTSDB node, configure Grafana to connect to an available OpenTSDB node.

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.
  - Monitoring Using MCS and the CLI
  - 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.
    - MapR Monitoring Architecture
      MapR Monitoring integrates with open-source components to collect, aggregate, store, and visualize metrics and logs.
    - Metric Collection
      Metrics are collected from each node in the cluster so that administrators can use the data to monitor the cluster. In general, the collectd service collects metrics every 10 seconds. The exception is volume metrics which are collected every 10 minutes.
    - Configure the OpenTSDB Service Heap Size
      By default, the OpenTSDB service is configured to use a default heap size of 2 gigabytes (recommended size is 6 gigabytes). You can edit the warden.opentsdb.conf file on each node to override the default value.
    - Metric Visualization
      Use dashboards to visualize the metrics across multiple nodes and clusters.
      - Access the Grafana UI
        You can launch the Grafana UI from the MCS or directly from a web browser.
      - Sample Dashboards in Grafana
        Use the sample dashboards to get familiar with the types of graphs you can create. As of MEP 1.1, sample dashboards are available by default in Grafana.
      - Update the OpenTSDB Data Source For Grafana
        Grafana connects to a single OpenTSDB node to read metrics. In the event that Grafana is unable to read metrics due to the failure of an OpenTSDB node, configure Grafana to connect to an available OpenTSDB node.
    - Log Collection
      Fluentd collects log events from each node in the cluster and stores them in a centralized location so that administrators can search the logs when troubleshooting issues in the cluster. The process that fluentd uses to parse and send log events to Elasticsearch differs based on the formatting of log events in each log file.
    - Log Aggregation and Storage
      Fluentd uses a round-robin approach when writing logs to Elasticsearch nodes. In the event that an Elasticsearch node in unavailable, Fluentd can fail over log storage to another Elasticsearch node.
    - Log Visualization
      Use dashboards to visualize the logs across multiple nodes and clusters.
    - MapR Monitoring Tips and Troubleshooting
    - Reconfiguring MapR Monitoring
      Changes to an existing cluster, such as the addition of services, may require additional steps to enable the collection of metrics and logs.
- 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

Update the OpenTSDB Data Source For Grafana

Grafana connects to a single OpenTSDB node to read metrics. In the event that Grafana is unable to read metrics due to the failure of an OpenTSDB node, configure Grafana to connect to an available OpenTSDB node.

About this task

NOTE: The OpenTSDB node that Grafana connects to by default is determined by the first OpenTSDB node that was specified when the cluster was configured to use MapR Monitoring

Procedure

Use one of the following method to launch the Grafana UI:
- From the MCS, select the Grafana view. After you select the Grafana view, you may also need to select the Pop-out page into a tab option.
- From a web browser, launch the following URL: http://<IPaddressOfGrafanaNode>:3000
Click the Grafana icon in the upper left corner to toggle the side menu bar.
Select Data Sources from the menu.
Click on the MapRMonitoringOpenTSDB data source.
In the Http setting section, update the Url field to point to an active OpenTSDB node.
Click Save & Test.