Usability: Mahout applications need a consistent API to allow users to specify
desired map/reduce concurrency
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Key: MAHOUT-414
URL: https://issues.apache.org/jira/browse/MAHOUT-414
Project: Mahout
Issue Type: Bug
Affects Versions: 0.3
Reporter: Jeff Eastman
Fix For: 0.4
If specifying the number of mappers and reducers is a common activity which
users need to perform in running Mahout applications on Hadoop clusters then we
need to have a standard way of specifying them in our APIs without exposing the
full set of Hadoop options, especially for our non-power-users. This is the
case for some applications already but others require the use of Hadoop-level
-D arguments to achieve reasonable out-of-the-box parallelism even when running
our examples. The usability defect is that some of our algorithms won't scale
without it and that we don't have a standard way to express this in our APIs.
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