Learning ECL

The HPCC Systems Community Wiki includes information provided by the community covering best practices, tips, sample code and examples. The HPCC Systems Red Book also contains useful information to help users manage the transition between releases.

This tutorial provides a walk-through of the development process from beginning to end and is designed to be an introduction to working with data on HPCC, as well as give an introduction to Thor and Roxie. The Sample Data Files are required references for the tutorial.

Sample Data File (one needed)
In ZIP format OriginalPerson.zip
In tar.gz format OriginalPerson.tar.gz
Uncompressed OriginalPerson

The ECL Programmers Guide gives an introduction to the ECL language along with example data and use cases. The supporting ECL Code Files referenced in the guide are included below.

Supporting ECL Files
In ZIP format ECL_Code_Files.zip

 

Comrise, a HPCC Systems partner, has also made available a Chinese translated version of the ECL Programmers Guide (version 4.2.0.3rc).

ECL Playground is a tool hosted on an ESP server. A page runs in your browser, allowing you to access and execute self-contained ECL code on your HPCC system without the use of any other tools. The ECL Playground then shows you the results and the graph in your browser. The view is very similar to what the ECL IDE displays.
Listen to the ECL Playground Podcast and how it can be a helpful tool for developers.

This guide is a collection of tips and techniques that target the best practices of ECL programming.

The ECL Scheduler is a component process installed with the HPCC system platform. ECL Scheduling provides a means of automating processes within ECL code or to chain processes together to work in sequence.

ECL is the Enterprise Control Language designed specifically for huge data projects using the HPCC platform. Its extreme scalability comes from a design that allows you to leverage every query you create for re-use in subsequent queries as needed. To do this, ECL takes a dictionary approach to building queries wherein each ECL definition defines an Attribute. Each previously defined Attribute can then be used in succeeding ECL Attribute definitions as the language extends itself as you use it.

The ECL compiler now supports adding external resources to a Workunit using a manifest file. The manifest, in XML format, adds external resources such as XSLT transformations, or other objects to the archive before it is compiled and deployed to the server. This document demonstrates how to use this feature to visualize ECL job results using Google Chart Tools.

The Standard Library Reference includes utility functions for string handling, date manipulation and others.

These steps explain how to move data on or off an HPCC Cluster.

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