About Release 7.6.1
This site contains documentation for HPE Ezmeral Data Fabric release 7.6.1, including installation, configuration, administration, and reference content, as well as content for the associated ecosystem components and drivers.
7.6.1 Installation
This section contains information about installing and upgrading HPE Ezmeral Data Fabric software. It also contains information about how to migrate data and applications from an Apache Hadoop cluster to a HPE Ezmeral Data Fabric cluster.
7.6.1 Data Fabric
HPE Ezmeral Data Fabric is the industry-leading data platform for AI and analytics that solves enterprise business needs.
7.6.1 Administration
This section describes how to manage the nodes and services that make up a cluster.
- Administering Users and Clusters
  Lists topics that help manage a data-fabric cluster.
- Administering Nodes
  Provides a synopsis of managing nodes in a cluster.
- Administering Volumes
  This section provide information about how to organize and manage data using volumes, a unique feature of HPE Ezmeral Data Fabric clusters.
- Administering Files and Directories
- Administering Tables
  Administration of the HPE Ezmeral Data Fabric Database is done primarily via the command line (maprcli) or with the Managed Control System (MCS). Regardless of whether the HPE Ezmeral Data Fabric Database table is used for binary files or JSON documents, the same types of commands are used with slightly different parameter options. HPE Ezmeral Data Fabric Database administration is associated with tables, columns and column families, and table regions.
- Administering Streams
- Administering Data Fabric Gateways
  A HPE Ezmeral Data Fabric gateway mediates one-way communication between a source HPE Ezmeral Data Fabric cluster and a destination cluster. You can replicate HPE Ezmeral Data Fabric Database tables (binary and JSON) and HPE Ezmeral Data Fabric Streams streams. HPE Ezmeral Data Fabric 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 the Control System and the CLI
    Describes the Overview page in the Control System, which displays information about the cluster.
    - Setting the Refresh Rate on the Control System
      Explains how to configure how frequently you want to refresh the graphs, and data in the Control System.
    - Customizing the List of Metric Charts and Columns on the Control System
      Explains how to customize the list of metric charts and columns on the Control System.
    - Monitoring the Cluster
      Explains how to view the cluster health, disk, memory, CPU utilization metrics, and alarms on the cluster using either the Control System or the CLI.
    - Monitoring Nodes
      Explains how to monitor nodes using either the Control System or the CLI.
    - Monitoring YARN
    - Monitoring Volumes
      Explains how to monitor volume parameters using the Control System.
    - Monitoring Tables
      Explains how to monitor table alarms and view table metrics in the Control System.
    - Monitoring Streams
      Explains how to monitor streams using either the Control System or the CLI.
    - Monitoring Alarms
      Provides an overview of how to monitor alarms using the Control Panel and the CLI.
      - Viewing Active Cluster Alarms
        Describes how to view cluster alarms using the Control System and the CLI.
      - Viewing Active Node Alarms
        Describes how to view active node alarms using the Control System and the CLI.
      - Viewing Active Volume Alarms
        Describes how to view volume alarms using the Control System and the CLI.
      - Viewing Active Table Replication Alarms
        Describes how to view active table replication alarms using the Control System and the CLI.
      - Viewing Active Stream Alarms
        Describes how to view active stream alarms using the Control System and the CLI.
    - Monitoring Errors
      Explains how to monitor errors using the Control System.
  - Using HPE Ezmeral Data Fabric Monitoring (Spyglass Initiative)
    HPE Ezmeral Data Fabric 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 security and manage secure clusters.
- Managing Secure Clusters
  Provides procedures that will enable you to use MapR clusters securely.
- Administering the Data Access Gateway
  The HPE Ezmeral Data Fabric Data Access Gateway is a service that acts as a proxy and gateway for translating requests between lightweight client applications and the HPE Ezmeral Data Fabric 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
  Lists the common errors and their solutions.
- Best Practices for Backing Up HPE Ezmeral Data Fabric Information
  Lists the best practices and performance considerations to follow when backing up HPE Ezmeral Data Fabric information.
- IPv6 Support in Data Fabric
  Describes the IPv6 support feature for Data Fabric.
7.6.1 Development
This section contains information related to application development for Ezmeral ecosystem components and HPE Ezmeral Data Fabric products, including the file system, Database (Key-Value and JSON), and Event Streams.
Other Docs
This section contains release-independent information, including: Installer documentation, Ecosystem release notes, interoperability matrices, security vulnerabilities, and links to other data-fabric version documentation.
Glossary
Definitions for commonly used terms in MapR Converged Data Platform environments.

Viewing Active Node Alarms

Describes how to view active node alarms using the Control System and the CLI.

Viewing Active Node Alarms in the Control System

Procedure

NOTE The Nodes page is not available in the Kubernetes version of the Control System.

Log in to the Control System and:

Click Nodes to view all the node alarms on the cluster in the Active Alarms pane.
Go to the node information page to view alarms in the Alarms pane for the selected node.
Click (in the top navigation bar) to display the Alarm Summary page and select Node Alarms from the drop-down menu in the All alarms pane.
Click Overview and select Node Alarms from the drop-down menu in the Active Alarms pane to view all the node alarms on the cluster.

You can:

View alarm notes
Mute an alarm
Dismiss an alarm

Retrieving Active Node Alarms Using the CLI or REST API

About this task

The basic command to retrieve node alarms is:

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

For complete reference information, see alarm list.