CDAP Documentation v3.4.3

The Cask™ Data Application Platform (CDAP) is an integrated, open source application development platform for the Apache Hadoop® ecosystem that provides developers with data and application abstractions to simplify and accelerate application development, address a broader range of real-time and batch use cases, and deploy applications into production while satisfying enterprise requirements.

CDAP is a layer of software running on top of Hadoop platforms such as the Cloudera Enterprise Data Hub, the Hortonworks® Data Platform, or the MapR Distribution. CDAP provides these essential capabilities:

  • Abstraction of data in the Hadoop environment through logical representations of underlying data;
  • Portability of applications through decoupling underlying infrastructures;
  • Services and tools that enable faster application creation in development;
  • Integration of the components of the Hadoop ecosystem into a single platform; and
  • Higher degrees of operational control in production through enterprise best practices.

CDAP exposes developer APIs (Application Programming Interfaces) for creating applications and accessing core CDAP services. CDAP defines and implements a diverse collection of services that support applications and data on existing Hadoop infrastructure such as HBase, HDFS, YARN, MapReduce, Hive, and Spark.

These documents are your complete reference to the Cask Data Application Platform: they help you get started and set up your development environment; explain how CDAP works; and teach how to develop and test CDAP applications.

It includes the CDAP programming APIs and client interfaces, with instructions on the installation, monitoring and diagnosing fully distributed CDAP in a Hadoop cluster.

  • Introduction to CDAP:
    • Simple Access to Powerful Technology: A comparison between using the current technologies available from the Hadoop ecosystem and using CDAP
  • Developers’ Manual:
    • Getting Started Developing: A quick, hands-on introduction to developing with CDAP
    • Overview: The overall architecture, abstractions, modes, and components behind CDAP
    • Building Blocks: The two core abstractions in CDAP: Data and Applications, and their components
    • Security: Perimeter security, configuration and client authentication
    • Testing and Debugging: Test framework plus tools and practices for debugging your applications
    • Ingesting Data: Different techniques for ingesting data into CDAP
    • Advanced Topics: Best practices for CDAP development, class loading in CDAP, adding a custom logback
  • CDAP Applications:
    • Big Data without Big Development: How to use CDAP “out-of-the-box” to solve problems and use cases
    • Introduction to CDAP Applications: Applications that are reusable through configuration and extensible through plugins
    • Cask Hydrator and ETL Pipelines: Makes performing ETL possible without writing code
    • Creating Custom ETL Plugins: For developers of custom ETL plugins
    • Cask Tracker: A CDAP extension that captures metadata for datasets, streams, and stream views
    • Data Quality: An extensible CDAP Application to assess the quality of data using its out-of-the-box functionality and libraries
  • Administration Manual:
    • Installation: Putting CDAP into production, with installation, configuration and upgrading for different distributions
    • Security: CDAP supports securing clusters using a perimeter security model
    • Operations: Logging, monitoring, metrics, runtime arguments, scaling instances, resource guarantees, transaction service maintenance, and introduces the CDAP UI
    • Appendices: Covers the CDAP installation and security configuration files
  • Integrations:
    • Cloudera: Integrating CDAP into Cloudera, using Cloudera Manager, running interactive queries with Impala, and bridging CDAP Metadata with Cloudera’s data management tool, Navigator
    • JDBC: The CDAP JDBC driver, included with CDAP
    • ODBC: The CDAP ODBC driver available for CDAP
    • Pentaho: Pentaho Data Integration, a business intelligence tool that can be used with CDAP
    • Squirrel: SquirrelSQL, a simple JDBC client that can be integrated with CDAP
  • Examples, Guides, and Tutorials:
    • Examples: Included with the CDAP SDK, they range from a simple introductory to more elaborate examples
    • How-To Guides: Designed to be completed in 15-30 minutes, these guides provide quick, hands-on instructions
    • Tutorials: Designed to be completed in 2-3 hours, these tutorials provide deeper, in-context explorations
    • CDAP Apps and Packs Repository: data applications built using CDAP and useful building blocks for your data applications
  • Reference Manual:
    • Command Line Interface API: Methods for interacting with a CDAP instance from within a shell
    • HTTP RESTful API: HTTP interface for a multitude of purposes
    • Java Client API: Methods for interacting with CDAP from external Java applications
    • Javadocs: The Java APIs for writing CDAP applications
    • Trademarks, Licenses, and Dependencies: Trademark and License information for CDAP and lists of CDAP dependent packages
  • FAQs: Answers to questions you might have about CDAP
    • General Questions
    • CDAP Installation and Startup
    • Cloudera Manager
    • Hydrator
    • Additional Resources: Other resources for solving problems
  • Glossary: Definitions of terms and phrases used in CDAP
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