[CONF] Apache Lucene Mahout: BuildingMahout (page edited)

[co...@apache.org]

BuildingMahout (MAHOUT) edited by abdelhakim deneche
      Page: http://cwiki.apache.org/confluence/display/MAHOUT/BuildingMahout
   Changes: http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=93207&originalVersion=8&revisedVersion=9






Content:
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h1. Prerequisites for Building Mahout

* Java JDK 1.6
* Maven 2.0.9 or higher (http://maven.apache.org/)

h1. Get the Source Code

Use [Subversion|http://subversion.tigris.org] to check out the code:
{code}
svn co http://svn.apache.org/repos/asf/lucene/mahout/trunk
{code} 


h1. Compiling

* change directory to the checked out directory
* mvn install 

{note:title=Important}

If you are Compiling under Windows, make sure you installed Cygwin correctly. Here is a [good tutorial|http://hayesdavis.net/2008/06/14/running-hadoop-on-windows/] on installing and configuring a Hadoop cluster on Windows, and it points out at antoher great tutorial about installing Cygwin.
Also if your Windows' Account name contains spaces (for example 'my account') some of the tests wont pass and the build will fail.
The easiest solution is to create a new Windows' Account that contains no spaces (for example 'myaccount'), and use that account when Compiling.
{note} 
This will run the default targets, which builds both the core and the examples, and also packages them.

h2. Compile Core
* change to the core directory
* mvn compile

h2. Install Core

Note, you can do install instead of compile.

* change to the core directory
* mvn install 

h2. Compile Examples

*You must "mvn install" the core before you can build the examples.  For some reason Maven doesn't know how to build sibling modules that are dependencies.*

* change to the examples directory
* mvn compile

h2. Compile Taste Web

* change to the taste-web directory
* Edit the recommender.properties value to add in your recommender class.  Make sure the recommender class is available in the classpath (i.e. add it to the WAR that gets created)
* mvn package

h3. Adding your own Taste recommender

Once MAHOUT-110 is committed, add your recommender JAR file into trunk/taste-web/lib and then edit the recommender.properties file and set the recommender.class property to the fully qualified name of your Recommender.

Then, doing a "mvn package" will bake your JAR file into the WAR file by adding it to WEB-INF/lib and setting the recommender.properties file will automatically configure the web.xml to use it.

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