HPE Ezmeral Data Fabric 6.2 is In Maintenance and transitions to "End of Maintenance" in June 2024. Please see the latest documentation.

About Release 6.2
This site contains documentation for HPE Ezmeral Data Fabric release 6.2 including installation, configuration, administration, and reference content, as well as content for the associated bundled ecosystem components and drivers.
6.2 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.
6.2 Data Fabric
HPE Ezmeral Data Fabric is the industry-leading data platform for AI and analytics that solves enterprise business needs.
6.2 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.
- 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.
  - maprcli and REST API Syntax
    This section provides information about the HPE Ezmeral Data Fabric command API. Most commands can be run on the command-line interface (CLI), or by making REST requests programmatically or in a browser.
  - Utilities
    Contains information about various scripts and utilities, that help setup, maintain, and monitor clusters.
  - Configuration Files
    This section contains reference information about various configuration files.
  - Alarms Reference
    The pages in this section provide details about all of the types of alarms.
    - User/Group Alarms
    - Cluster Alarms
    - Node Alarms
      - CLDB Service Alarm
      - Core Present Alarm
      - Debug Logging Active
      - Disk Failure
      - Duplicate Host ID
      - FileServer Service Alarm
      - Heartbeat Processing Slow
      - HBMaster Service Alarm
      - HBRegion Service Alarm
      - High MAST Gateway Memory Alarm
      - HistoryServer Alarm
      - HiveMeta Alarm
      - HiveServer 2 Alarm
      - Hoststats Alarm
      - Incorrect Topology Alarm
      - Installation Directory Full Alarm
      - Instance Mismatch Alarm
      - High FileServer Memory Alarm
      - MapR User Mismatch
      - Memory Allocation Alarm
      - Memory Usage Alarm
      - NFS Gateway Alarm
      - NFSv4 Service Alarm
      - NodeManager Alarm
        Explains how to resolve the issue with the Node Manager service stopping on the node.
      - No Disk Attached Alarm
      - No Heartbeat Alarm
        Describes the NODE_ALARM_NO_HEARTBEAT alarm.
      - Security Certificate Expiry Alarm
        Describes the NODE_ALARM_CERTIFICATE_NEAR_EXPIRATION alarm.
      - Node Too Many Containers
      - Oozie Alarm
      - PAM Misconfigured Alarm
      - ResourceManager Alarm
      - Root Partition Full Alarm
      - Tiny Buckets Flush Alarm
      - Time Skew Alarm
      - Version Alarm
      - WebServer Service Alarm
    - Table-Replication Alarms
    - Secondary Index Alarms
    - Volume Alarms
  - HPE Ezmeral Data Fabric Environment
    This section provides information associated with the Data Fabric environment.
- 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.
6.2 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.

WebServer Service Alarm

UI Column: Webserver Alarm
Logged As: NODE_ALARM_SERVICE_WEBSERVER_DOWN
Meaning: The WebServer service on the node has stopped running.
Resolution: Go to the node information page or the Services page in the Control System to check whether the WebServer service is running. The warden will try three times to restart the service automatically. After an interval (30 minutes by default) the warden will again try three times to restart the service. The interval can be configured using the parameter services.retryinterval.time.sec in warden.conf. If the warden successfully restarts the WebServer service, the alarm is cleared. If the warden is unable to restart the WebServer service, see more troubleshooting information.