Home
6.0 Development
This section contains information related to application development for ecosystem components and MapR products including MapR-DB (binary and JSON), MapR-FS, and MapR Streams.
MapR-ES and Apps
MapR-ES brings integrated publish and subscribe messaging to the MapR Converged Data Platform.
MapR-ES C Applications
C applications can be developed for MapR-ES (as of MapR 5.2.1). The MapR-ES C Client is a distribution of librdkafka that works with MapR-ES. The MapR-ES C Client is available in MapR Ecosystem Pack (MEP) 3.0 or higher.

MapR 6.0 Documentation

6.0 Development
This section contains information related to application development for ecosystem components and MapR products including MapR-DB (binary and JSON), MapR-FS, 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.
- MapR-FS and Apps
  The following sections provide information about accessing MapR-FS with C and Java applications.
- MapR-DB and Apps
  This section contains information about developing client applications for JSON and binary tables.
- MapR-ES and Apps
  MapR-ES brings integrated publish and subscribe messaging to the MapR Converged Data Platform.
  - Getting Started with MapR-ES
    If you have a basic understanding of MapR-ES's components and the typical flow of messages from producers to consumers, you can give MapR-ES 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.
  - MapR-ES Java Applications
    This section contains information on developing client applications with Java including information about the MapR-ES and Apache Kafka Java APIs, configuration parameters, and compiling and running producers and consumers.
  - MapR-ES C Applications
    C applications can be developed for MapR-ES (as of MapR 5.2.1). The MapR-ES C Client is a distribution of librdkafka that works with MapR-ES. The MapR-ES C Client is available in MapR Ecosystem Pack (MEP) 3.0 or higher.
    - Configuring the MapR-ES C Client
      After installing the MapR Client and before developing applications, you must configure your client C library by setting the library path.
    - Developing a MapR-ES C Application
      This topic includes basic information about how to develop a MapR-ES C application. Sample applications are provided.
    - Migrating Kafka C Applications to MapR-ES
      With some modification, you can use existing Kafka C applications to consume and produce topics in MapR-ES. The MapR-ES C Client is a distribution of librdkafka that is compatible with MapR-ES.
    - librdkafka APIs Supported by MapR-ES C Client
      This topic lists the librdkafka APIs supported by the MapR-ES C Client. It also describes behavior differences between librdkafka and the MapR-ES C Client.
    - librdkafka APIs NOT Supported by MapR-ES C Client
      This topic lists the librdkafka APIs that are not supported by the MapR-ES C Client.
    - Configuration Properties for MapR-ES C Client
      This topic describes the configuration properties supported by the MapR-ES C Client. This includes librdkafka configuration properties that MapR-ES supports and additional properties that are specific to MapR-ES.
    - rdkafka.h
      This rdkafka header file has been updated to be compatible with MapR-ES. After you install the MapR-ES C Client, this file is available in the following directory: /opt/mapr/include/librdkafka/
  - MapR-ES Python Applications
    As of MapR 5.2.1, you can create python applications for MapR-ES using the MapR-ES Python client. The MapR-ES Python client is a binding for librdkafka and the MapR-ES C Client is a distribution of librdkafka that works with MapR-ES.
  - MapR-ES C#/.NET Applications
    As of MapR 6.0.1/MEP5.0, you can create C#/.NET applications for MapR-ES using the MapR-ES C#/.NET client. The MapR-ES C#/.NET client is a binding for librdkafka and the MapR-ES C Client is a distribution of librdkafka that works with MapR-ES.
  - Utilities for MapR-ES
    MapR-ES 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.
- MapR Data Science Refinery
  The MapR Data Science Refinery is an easy-to-deploy and scalable data science toolkit with native access to all platform assets and superior out-of-the-box security.
- MapR Data Fabric for Kubernetes FlexVolume Driver
  This section describes how to use and troubleshoot the MapR Data Fabric for Kubernetes FlexVolume Driver.
- Ecosystem Components
  The following sections provide information about each open source project that MapR supports.
- Maven and MapR
  This section discusses topics associated with Maven and MapR.
- Developer's Reference
  This section contains in-depth information for the developer.
- API Documentation
  MapR supports public APIs for MapR-FS, MapR-DB, and MapR-ES. These APIs are available for application development purposes.

MapR-ES C Applications

C applications can be developed for MapR-ES (as of MapR 5.2.1). The MapR-ES C Client is a distribution of librdkafka that works with MapR-ES. The MapR-ES C Client is available in MapR Ecosystem Pack (MEP) 3.0 or higher.

The following Apache Kafka librdkafka versions are supported:

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

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

When developing and running MapR-ES 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 MapR 6.0, the MapR-ES offset values start at 0.
MapR Security is supported. Kafka application-level security is not supported. See Security.
User impersonation is not supported.

(Topic last modified: 2018-08-21)