Thanks for using Cascading.
Project and contact information: http://www.cascading.org/
This distribution includes six Cascading jar files:
- cascading-x.y.z.jar - all relevant Cascading class files and libraries, with a 'lib' folder
- cascading-core-x.y.z.jar - all Cascading Core class files
- cascading-local-x.y.z.jar - all Cascading Local mode class files
- cascading-hadoop-x.y.z.jar - all Cascading Hadoop mode class files
- cascading-xml-x.y.z.jar - all Cascading XML operations class files
- cascading-test-x.y.z.jar - all Cascading tests and test utilities
These jars are all available via www.conjars.org.
Hadoop mode is where the Cascading application should run on a Hadoop cluster.
Local mode is where the Cascading application will run locally in memory without any Hadoop dependenices.
To build Cascading, run the following in the shell:
> git clone https://github.com/cwensel/cascading.git > cd cascading > gradle build
Cascading currently requires Gradle 1.0-milestone-8a to build.
To use an IDE like IntelliJ, run the following to get all jar dependencies:
> gradle ideLibs
Using with Apache Hadoop:
To use Cascading with Hadoop, we suggest stuffing
cascading-xml jarfiles and all third-party libs (optionally retrieved by calling
gradle ideLibs) into the
lib folder of your job jar and executing your job via
$HADOOP_HOME/bin/hadoop jar your.jar <your args>.
Note you do not need to put the lib/hadoop jars in your jar as they are already present in your cluster.
For example, your job jar would look like this (via:
jar -t your.jar)
/<all your class and resource files> /lib/cascading-core-x.y.z.jar /lib/cascading-hadoop-x.y.z.jar /lib/cascading-xml-x.y.z.jar /lib/<cascading third-party jar files>
Hadoop will unpack the jar locally and remotely (in the cluster) and add any libraries in
lib to the classpath. This is a feature specific to Hadoop.
The cascading-x.y.z.jar file is typically used with scripting languages and is completely self contained, but it cannot be added to a jar
lib folder as Hadoop will not recursively unjar jars.