Convert decomposer code to Hadoop 0.20 API
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Key: MAHOUT-419
URL: https://issues.apache.org/jira/browse/MAHOUT-419
Project: Mahout
Issue Type: Improvement
Components: Math
Affects Versions: 0.3
Reporter: Danny Leshem
org.apache.mahout.math.hadoop classes (MatrixMultiplicationJob,
TimesSquaredJob, TransposeJob) all use the deprecated Hadoop API. In the spirit
of MAHOUT-167 and MAHOUT-143, I suggest converting them to Hadoop's 0.20 API.
The reason I'm raising this now is that this code no longer runs on my Hadoop
0.22-SNAPSHOT cluster (not sure why really - it was running fine about a month
ago, but after updating to the latest Mahout trunk a few days ago the code
throws "java.lang.RuntimeException: Error in configuring object" at
MapTask.runOldMapper).
Also, the documentation at
https://cwiki.apache.org/MAHOUT/dimensionalreduction.html is no longer accurate
- the command line parameters have changed (even without the new arguments from
MAHOUT-308). This is partly due to using the new argument parser which receives
the input/output directories differently.
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