About Release 7.1
This site contains documentation for HPE Ezmeral Data Fabric release 7.1, including installation, configuration, administration, and reference content, as well as content for the associated ecosystem components and drivers.
7.1 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.
7.1 Data Fabric
HPE Ezmeral Data Fabric is the industry-leading data platform for AI and analytics that solves enterprise business needs.
7.1 Administration
This section describes how to manage the nodes and services that make up a cluster.
7.1 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.
  - Getting Started with Apache Kafka Wire Protocol Service
    Describes the steps required to install, configure, and use Apache Kafka Wire Protocol Service.
  - Configuring Apache Kafka Wire Protocol Service
    Describes the Apache Kafka Wire Protocol Service configuration files and instructions.
  - Mapping Topics to Streams
    Describes why you map topics to streams, provides instructions for creating mapping rules, and also includes examples.
  - Securing Apache Kafka Wire Protocol Service
    Describes the security mechanisms that Apache Kafka Wire Protocol Service does and does not support.
  - Supported Apache Kafka RPCs
    Lists the Apache Kafka RPCs that Apache Kafka Wire Protocol Service supports and provides links to the correlating API request documentation in the Kafka Protocol Guide.
- 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.
- 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.

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.

Before Apache Kafka Wire Protocol Service was introduced, you had to use a modified version of the open-source libraries (kafka-clients.jar and librdkafka.so) for user applications to connect and publish/subscribe messages to topics in HPE Ezmeral Data Fabric Streams. With Apache Kafka Wire Protocol Service, you can simply use the Apache Kafka client libraries.

Apache Kafka Wire Protocol Service provides the following benefits:

User applications can connect, publish, and subscribe to HPE Ezmeral Data Fabric Streams topics using standard Apache Kafka client libraries.
User applications developed using Apache Kafka clients do not require any modification to work with this new system, including recompilation, reconfiguration, or dependency management.
Supports available Apache Kafka clients in multiple programming languages, both from the Apache Software Foundation and the community.

For more information, see Getting Started with Apache Kafka Wire Protocol Service.

Architecture

The Apache Kafka Wire Protocol Service works within DAG (data access gateway) to act as a Kafka Broker (server in an Apache Kafka cluster). For all application purposes, the HPE Ezmeral Data Fabric cluster (with DAG and Apache Kafka Wire Protocol Service) runs like an Apache Kafka cluster.

The following image shows the communication paths between Apache Kafka clients and HPE Ezmeral Data Fabric with DAG and Apache Kafka Wire Protocol Service acting as brokers:

Monitoring

DAG is not a Kafka Broker; therefore, Broker metrics are not available. However, you can monitor Data Fabric core services, as described in Using HPE Ezmeral Data Fabric Monitoring (Spyglass Initiative).

Limitations

The following list describes unsupported functionality in the initial release of Apache Kafka Wire Protocol Service:

Quotas
Transactions
Idempotent Producer
Kafka ACL-based security
Topic-level security using ACEs.
Group ACEs for Consumer Groups
Delegation tokens
Log directories