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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.
Developer's Reference
This section contains in-depth information for the developer.
Utilities for MapR-DB JSON Tables
MapR-DB JSON provides utilities to copy, export, and import data, compare table content, and verify the consistency of secondary indexes.

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.
- 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.
  - MapR-DB Shell (JSON Tables)
    The mapr dbshell is a tool that enables you to create and perform basic manipulation of JSON tables and documents. You run dbshell by typing mapr dbshell on the command line after logging into a node in a MapR cluster.
  - Utilities for MapR-DB JSON Tables
    MapR-DB JSON provides utilities to copy, export, and import data, compare table content, and verify the consistency of secondary indexes.
    - MapR-DB JSON CopyTable
      Copies data from one MapR-DB JSON table to another MapR-DB JSON table.
    - MapR-DB JSON DiffTables
      Compares the row keys, column families, and field values in two JSON tables. Then, generates two directories that contain sequence files that you can use to merge the rows from the two JSON tables.
    - MapR-DB JSON DiffTablesWithCrc
      This utility uses a cyclic redundancy check to detect differences between sets of rows in the specified MapR-DB JSON tables. Then, for each set of non-identical rows, it performs a detailed comparison. Finally, it generates one or more directories of sequence files. You can use these files either to merge the rows from two MapR-DB JSON tables.
    - MapR-DB JSON FormatResult
      Parses a sequence file generated by the difftables utility for JSON tables and converts the results into a format that makes the results easier to understand.
    - MapR-DB JSON ExportTable and ImportTable
      Use these utilities together to export data from JSON tables into binary sequence files, and then import the data from the binary sequence files into other JSON tables. You can also use the mapr importtable utility to import changes that are specified in sequence files output by the mapr difftables utility.
    - MapR-DB JSON ImportJSON
      Imports one or more JSON documents into a MapR-DB JSON table. The JSON documents must be flat text files.
    - MapR-DB JSON verifyindex
      Describes how to use the MapR-DB JSON verifyindex command to verify that the data in a secondary index is consistent with its JSON table.
  - MapR-DB HBase Shell (Binary Tables)
    You can manage MapR-DB tables using HBase shell commands and additional HBase shell commands included in the MapR distribution of Hadoop.
  - Utilities for MapR-DB Binary Tables
    MapR-DB provides utilities to copy and compare data in MapR-DB binary tables.
  - MapR-ES Utilities
  - YARN Commands
    This section describes the YARN commands.
  - Source Code for MapR Software
    MapR releases source code to the open-source community for enhancements that MapR has made to the Apache Hadoop project and other ecosystem components.
  - Hadoop Commands
    This section describes the Hadoop commands.
- API Documentation
  MapR supports public APIs for MapR-FS, MapR-DB, and MapR-ES. These APIs are available for application development purposes.

Utilities for MapR-DB JSON Tables

MapR-DB JSON provides utilities to copy, export, and import data, compare table content, and verify the consistency of secondary indexes.

You can use the following utilities with MapR-DB JSON tables: