Mapper tab

Pentaho MapReduce Mapper tab

The following table describes the options for defining a mapper transformation, which is required by this entry:

Option	Definition
Transformation	Specify the transformation that will perform the mapping functions for this job by entering its path or clicking Browse. If you select a transformation that has the same root path as the current transformation, the variable**${Internal.Entry.Current.Directory}** will automatically be inserted in place of the common root path. For example, if the current transformation's path is /home/admin/transformation.ktr and you select a transformation in the folder /home/admin/path/sub.ktr than the path will automatically be converted to **$\{Internal.Entry.Current.Directory\}**/path/sub.ktr. If you are working with a repository, specify the name of the transformation in your repository. If you are not working with a repository, specify the XML file name of the transformation on your system. Note: Transformations previously specified by reference are automatically converted to be specified by name within the Pentaho Repository.
Input step name	Specify the name of the step that receives mapping data from Hadoop. It must be a MapReduce Input step.
Output step name	Specify the name of the step that passes mapping output back to Hadoop. It must be a MapReduce Output step.