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6.2 Development
This section contains information related to application development for ecosystem components and MapR products including HPE Ezmeral Data Fabric Database (binary and JSON), filesystem, and MapR Streams.
HPE Ezmeral Data Fabric Event Data Streams and Apps
HPE Ezmeral Data Fabric Event Data Streams brings integrated publish and subscribe messaging to HPE Ezmeral Data Fabric.
HPE Ezmeral Data Fabric Event Data Streams Python Applications
As of HPE Ezmeral Data Fabric 5.2.1, you can create python applications for HPE Ezmeral Data Fabric Event Data Streams using the HPE Ezmeral Data Fabric Event Data Streams Python client. The HPE Ezmeral Data Fabric Event Data Streams Python client is a binding for librdkafka and the HPE Ezmeral Data Fabric Event Data Streams C Client is a distribution of librdkafka that works with HPE Ezmeral Data Fabric Event Data Streams.

HPE Ezmeral Data Fabric 6.2 Documentation

6.2 Development
This section contains information related to application development for ecosystem components and MapR products including HPE Ezmeral Data Fabric Database (binary and JSON), filesystem, and MapR Streams.
- Application Development Process
  Before you start developing applications on MapR’s Converged Data Platform, consider how you will get the data onto the platform, the format it will be stored in, the type of processing or modeling that is required, and how the data will be accessed.
- filesystem and Apps
  The following sections provide information about accessing filesystem with C and Java applications.
- HPE Ezmeral Data Fabric Database and Apps
  This section contains information about developing client applications for JSON and binary tables.
- HPE Ezmeral Data Fabric Event Data Streams and Apps
  HPE Ezmeral Data Fabric Event Data Streams brings integrated publish and subscribe messaging to HPE Ezmeral Data Fabric.
  - Getting Started with HPE Ezmeral Data Fabric Event Data Streams
    If you have a basic understanding of HPE Ezmeral Data Fabric Event Data Streams's components and the typical flow of messages from producers to consumers, you can give HPE Ezmeral Data Fabric Event Data Streams a try.
  - 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 Event Data Streams Java Applications
    This section contains information on developing client applications with Java including information about the HPE Ezmeral Data Fabric Event Data Streams and Apache Kafka Java APIs, configuration parameters, and compiling and running producers and consumers.
  - HPE Ezmeral Data Fabric Event Data Streams C Applications
    C applications can be developed for HPE Ezmeral Data Fabric Event Data Streams (as of MapR 5.2.1). The HPE Ezmeral Data Fabric Event Data Streams C Client is a distribution of librdkafka that works with HPE Ezmeral Data Fabric Event Data Streams. The HPE Ezmeral Data Fabric Event Data Streams C Client is available in Ecosystem Pack (MEP) 3.0 or higher.
  - HPE Ezmeral Data Fabric Event Data Streams Python Applications
    As of HPE Ezmeral Data Fabric 5.2.1, you can create python applications for HPE Ezmeral Data Fabric Event Data Streams using the HPE Ezmeral Data Fabric Event Data Streams Python client. The HPE Ezmeral Data Fabric Event Data Streams Python client is a binding for librdkafka and the HPE Ezmeral Data Fabric Event Data Streams C Client is a distribution of librdkafka that works with HPE Ezmeral Data Fabric Event Data Streams.
    - Developing HPE Ezmeral Data Fabric Event Data Streams Python Applications
      This topic includes basic information about how to develop a HPE Ezmeral Data Fabric Event Data Streams Python application and an example program that you can run.
    - Migrating Kafka Python Applications to HPE Ezmeral Data Fabric Event Data Streams
      With some modification, you can use existing confluent-kafka python applications to consume and produce topics in HPE Ezmeral Data Fabric Event Data Streams. The HPE Ezmeral Data Fabric Event Data Streams Python Client is a binding for Apache librdkafka that works with HPE Ezmeral Data Fabric Event Data Streams.
    - API for HPE Ezmeral Data Fabric Event Data Streams Python Client
      HPE Ezmeral Data Fabric Event Data Streams Python Client is a binding for librdkafka and it supports the following APIs.
    - Configuration Properties for HPE Ezmeral Data Fabric Event Data Streams Python Client
      In the instance constructor of a HPE Ezmeral Data Fabric Event Data Streams Python application, you can use a dictionary to set the following configuration properties. HPE Ezmeral Data Fabric Event Data Streams Python client supports a superset of the configuration properties supported by the HPE Ezmeral Data Fabric Event Data Streams C client.
  - HPE Ezmeral Data Fabric Event Data Streams C#/.NET Applications
    As of HPE Ezmeral Data Fabric 6.0.1/MEP5.0, you can create C#/.NET applications for HPE Ezmeral Data Fabric Event Data Streams using the HPE Ezmeral Data Fabric Event Data Streams C#/.NET client. The HPE Ezmeral Data Fabric Event Data Streams C#/.NET client is a binding for librdkafka and the HPE Ezmeral Data Fabric Event Data Streams C Client is a distribution of librdkafka that works with HPE Ezmeral Data Fabric Event Data Streams.
  - Utilities for HPE Ezmeral Data Fabric Event Data Streams
    HPE Ezmeral Data Fabric Event Data 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 filesystem, HPE Ezmeral Data Fabric Database, and HPE Ezmeral Data Fabric Event Data Streams. These APIs are available for application-development purposes.

HPE Ezmeral Data Fabric Event Data Streams Python Applications

As of HPE Ezmeral Data Fabric 5.2.1, you can create python applications for HPE Ezmeral Data Fabric Event Data Streams using the HPE Ezmeral Data Fabric Event Data Streams Python client. The HPE Ezmeral Data Fabric Event Data Streams Python client is a binding for librdkafka and the HPE Ezmeral Data Fabric Event Data Streams C Client is a distribution of librdkafka that works with HPE Ezmeral Data Fabric Event Data Streams.

The HPE Ezmeral Data Fabric Event Data Streams Python client is available in a Ecosystem Pack (MEP) starting with MEP 3.0.

The following Apache Kafka librdkafka versions are supported:

Table 1. Supported Apache Kafka librdkafka versions
Core release	MEP Release	Kafka librdkafka version
As of HPE Ezmeral Data Fabric 6.0.1	As of 5.0	0.11.3
As of HPE Ezmeral Data Fabric 5.2.1 through 6.0.0	As of 3.0	0.9.0

Note: Because the HPE Ezmeral Data Fabric Event Data Streams Python Client is dependent on the HPE Ezmeral Data Fabric Event Data Streams C Client, the HPE Ezmeral Data Fabric Event Data Streams C Client must be configured before using the HPE Ezmeral Data Fabric Event Data Streams Python Client.

When developing and running HPE Ezmeral Data Fabric Event Data Streams Python applications, note the following points:

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.
HPE Ezmeral Data Fabric Event Data Streams offset values start at 1, not 0.
HPE Ezmeral Data Fabric security is supported including ACLs and ACEs for authorization. The unique Kafka security features that are part of Apache Kafka are not supported. See Security for more information about HPE Ezmeral Data Fabric security features.
User impersonation is not supported.

(Topic last modified: 2021-07-30)