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.
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.
- 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.
- Apache Kafka Wire Protocol Service
  HPE Ezmeral Data Fabric Streams supports Apache Kafka Wire Protocol Service. Apache Kafka Wire Protocol Service is a TCP/IP service that emulates a Kafka cluster backed by HPE Ezmeral Data Fabric Streams. The service makes it possible for Apache Kafka clients written in any programming language to access topics in HPE Ezmeral Data Fabric Streams.
- HPE Ezmeral Data Fabric Streams and Apps
  HPE Ezmeral Data Fabric Streams brings integrated publish and subscribe messaging to HPE Ezmeral Data Fabric.
  - Getting Started with HPE Ezmeral Data Fabric Streams
    If you have a basic understanding of HPE Ezmeral Data Fabric Streams components and the typical flow of messages from producers to consumers, you can get started.
  - Consuming CDC Records
    The OJAI changelog interfaces are used to consume changed data records (propagated by the Change Data Capture feature).
  - Consuming Audit Logs
    Audit Streaming (available from v6.0.1) provides a way to process the audit data in real-time.
  - HPE Ezmeral Data Fabric Streams Java Applications
    This section contains information on developing client applications with Java including information about the HPE Ezmeral Data Fabric Streams and Apache Kafka Java APIs, configuration parameters, and compiling and running producers and consumers.
  - HPE Ezmeral Data Fabric Streams C Applications
    You can develop C applications for HPE Ezmeral Data Fabric Streams. The HPE Ezmeral Data Fabric Streams C Client is a distribution of librdkafka that works with HPE Ezmeral Data Fabric Streams. The HPE Ezmeral Data Fabric Streams C Client is available in Ecosystem Pack (EEP) 3.0 and later.
    - Configuring the HPE Ezmeral Data Fabric Streams C Client
      After installing the HPE Ezmeral Data Fabric Client and before developing applications, you must configure your client C library by setting the library path.
    - Developing a HPE Ezmeral Data Fabric Streams C Application
      This topic includes basic information about how to develop a HPE Ezmeral Data Fabric Streams C application. Sample applications are provided.
    - Migrating Kafka C Applications to HPE Ezmeral Data Fabric Streams
      With some modification, you can use existing Kafka C applications to consume and produce topics in HPE Ezmeral Data Fabric Streams. The HPE Ezmeral Data Fabric Streams C Client is a distribution of librdkafka that is compatible with HPE Ezmeral Data Fabric Streams.
    - librdkafka APIs Supported by HPE Ezmeral Data Fabric Streams C Client
      This topic lists the librdkafka APIs supported by the HPE Ezmeral Data Fabric Streams C Client. It also describes behavior differences between librdkafka and the HPE Ezmeral Data Fabric Streams C Client.
    - librdkafka APIs NOT Supported by HPE Ezmeral Data Fabric Streams C Client
      This topic lists the librdkafka APIs that are not supported by the HPE Ezmeral Data Fabric Streams C Client.
    - Configuration Properties for HPE Ezmeral Data Fabric Streams C Client
      This topic describes the configuration properties supported by the HPE Ezmeral Data Fabric Streams C Client. This includes librdkafka configuration properties that HPE Ezmeral Data Fabric Streams supports and additional properties that are specific to HPE Ezmeral Data Fabric Streams.
    - rdkafka.h
      This rdkafka header file has been updated to be compatible with HPE Ezmeral Data Fabric Streams. After you install the HPE Ezmeral Data Fabric Streams C Client, this file is available in the following directory: /opt/mapr/include/librdkafka/
  - HPE Ezmeral Data Fabric Streams Python Applications
    As of HPE Ezmeral Data Fabric 5.2.1, you can create python applications for HPE Ezmeral Data Fabric Streams using the HPE Ezmeral Data Fabric Streams Python client. The HPE Ezmeral Data Fabric Streams Python client is a binding for librdkafka and the HPE Ezmeral Data Fabric Streams C Client is a distribution of librdkafka that works with HPE Ezmeral Data Fabric Streams.
  - HPE Ezmeral Data Fabric Streams C#/.NET Applications
    As of HPE Ezmeral Data Fabric 6.0.1/EEP5.0, you can create C#/.NET applications for HPE Ezmeral Data Fabric Streams using the HPE Ezmeral Data Fabric Streams C#/.NET client. The HPE Ezmeral Data Fabric Streams C#/.NET client is a binding for librdkafka and the HPE Ezmeral Data Fabric Streams C Client is a distribution of librdkafka that works with HPE Ezmeral Data Fabric Streams.
  - Utilities for HPE Ezmeral Data Fabric Streams
    HPE Ezmeral Data Fabric Streams provides the utilities for operating on streams and topics.
  - Configuring Properties for Message Size
    Describes the message.max.bytes and receive.message.max.bytes properties for configuring message size.
- 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.
- 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.

HPE Ezmeral Data Fabric Streams C Applications

You can develop C applications for HPE Ezmeral Data Fabric Streams. The HPE Ezmeral Data Fabric Streams C Client is a distribution of librdkafka that works with HPE Ezmeral Data Fabric Streams. The HPE Ezmeral Data Fabric Streams C Client is available in Ecosystem Pack (EEP) 3.0 and later.

The following Apache Kafka librdkafka versions are supported:

Table 1. Supported Apache Kafka librdkafka versions
Core release	EEP Release	Kafka librdkafka version
As of 6.0.1	As of 5.0	0.11.3
As of 5.2.1 through 6.0.0	As of 3.0	0.9.0

The HPE Ezmeral Data Fabric Streams C Client supports a majority of the librdkafka C APIs plus additional configuration properties that are available only with HPE Ezmeral Data Fabric Streams. When developing applications for HPE Ezmeral Data Fabric Streams or migrating Kafka applications to HPE Ezmeral Data Fabric Streams, see the list of librdkafka APIs Supported by HPE Ezmeral Data Fabric Streams C Client which also describes API behavior. Reference rdkafka.h for API signatures.

When developing and running HPE Ezmeral Data Fabric Streams C applications, note the following:

You can create producers and high-level consumers. Low-level consumers are not supported.
Consuming or producing topics in a Kafka cluster is not supported.
As of HPE Ezmeral Data Fabric 6.0, the HPE Ezmeral Data Fabric Streams offset values start at 0.
HPE Ezmeral Data Fabric Security is supported. Kafka application-level security is not supported. See Security.
User impersonation is not supported.

CAUTION As of HPE Ezmeral Data Fabric 6.1, the mapr-core package has a dependency on mapr-librdkafka. If the mapr-librdkafka package is installed, do not remove it manually. Doing so could result in the removal of HPE Ezmeral Data Fabric core packages, rendering the node unusable.