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.
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.
- Application Development Process
  Before you start developing applications on the HPE Ezmeral Data Fabric platform, consider how you will get the data into the platform, the storage format of the data, the type of processing or modeling that is required, and how the data will be accessed.
- File Store and Apps
  The following sections provide information about accessing the File Store with C and Java applications.
- HPE Ezmeral Data Fabric Database and Apps
  This section contains information about developing client applications for JSON and key-value tables.
- HPE Ezmeral Data Fabric Streams and Apps
  HPE Ezmeral Data Fabric Streams brings integrated publish and subscribe messaging to HPE Ezmeral Data Fabric.
- MapReduce and Apps
  This section contains information associated with developing YARN applications.
- Kubernetes Interfaces for Data Fabric
  This section describes how to leverage the capabilities of the Kubernetes Interfaces for Data Fabric.
  - Container Storage Interface (CSI) Storage Plugin
    This section describes how to use and troubleshoot the Container Storage Interface (CSI) Storage Plugin.
  - Kubernetes FlexVolume Driver
    This section describes how to use and troubleshoot the HPE Ezmeral Data Fabric for Kubernetes FlexVolume Driver.
    - Using
      This section describes how to configure Kubernetes objects to enable persistent storage and includes example configuration files for static and dynamic provisioning.
    - Troubleshooting
      This section describes how to resolve common problems you might encounter when using the Kubernetes Interfaces for Data Fabric FlexVolume driver.
      - Log Files
      - Useful Troubleshooting Commands
- Ecosystem Components
  The following sections provide information about each open-source project that is supported by the HPE Ezmeral Data Fabric.
- Maven and the HPE Ezmeral Data Fabric
  This section discusses topics associated with Maven and the HPE Ezmeral Data Fabric.
- Developer's Reference
  This section contains in-depth information for the developer.
- API Documentation
  HPE Ezmeral Data Fabric supports public APIs for file system, HPE Ezmeral Data Fabric Database, and HPE Ezmeral Data Fabric Streams. These APIs are available for application-development purposes.
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.

Troubleshooting the Kubernetes Interfaces for Data Fabric FlexVolume Driver

This section describes how to resolve common problems you might encounter when using the Kubernetes Interfaces for Data Fabric FlexVolume driver.

Shared Memory Lock Causes POSIX Failure

Problem: On an upgrade from a previous version of the volume plug-in, POSIX can fail with the following error in the POSIX log file: Create/Attach to stats shared memory failed.
Possible Cause: A shared-memory segment lock can prevent the mount from becoming available to the requested pod.
Resolution: Follow the steps in Troubleshooting loopbacknfs POSIX Client Upgrades to remove the lock. Then retry the operation.

Unable to Access file system

Problem

Storage is not mounted and no errors are generated in the plugin or provisioner logs.

Possible Cause

The fusermount symlink might be broken.

Resolution

If the symlink points to a location other than /opt/mapr/k8s/bin/fusermount, unlink it using the following command from the command line on the host:

unlink /bin/fusermount

Then re-create the Kubernetes Pod.

Pod Container Stuck in Container Creation State During Installation

Problem: During installation, the Pod container can become stuck in the container creation state on a node, and the/opt/mapr/k8s directory is not created. As a result, the plug-in does not get copied to the node.

Possible Cause: Unknown.

Resolution

Check the installation logs for an indication that the installation is not completed or the /opt/mapr/k8s directory is not created. Restart the kubelet service in the node:

systemctl restart kubelet