Load

Welcome

This is the Cascading.Load (Load) application.

Load provides a simple command line interface for building high load cluster jobs, based on Cascading.

Cascading is an application framework for Java developers to quickly and easily develop robust Data Analytics and Data Management applications on Apache Hadoop. It can be found at http://www.cascading.org/

Installing

Installation is not necessary if you want to run Load directly from the distribution folder, or if Load was pre-installed with your Hadoop distribution.

To see if Load has already been added to your PATH, type:

$ which load

To install for all users into /usr/local/bin:

$ sudo ./bin/load install

or for the current user only into ~/.load:

$ ./bin/load install

For detailed instructions:

$ ./bin/load help install

Choose the method that best suites your environment.

If you are running Load on AWS Elastic MapReduce, you need to follow the Elastic MapReduce instructions on the AWS site, which typically expect the load-<release-date>.jar to be uploaded to AWS S3.

Using

The environment variable HADOOP_HOME should always be set to use Cascading.Load.

To run from the command line with the jar, Hadoop should be in the path:

$ hadoop jar load-<release-date>.jar <args>

or if Load has been installed from above:

$ load <args>

If no args are given, a comprehensive list of commands will be printed. That list is also available as COMMANDS.md in this directory.

Building

This release uses Cascading 2.0 and will pull all dependencies from the relevant maven repos, including http://conjars.org

To build a jar,

$ gradle jar

To test,

$ gradle test

License

See apl.txt in this directory.