Simplify configuring and running Mahout MapReduce jobs from Java using Java
bean configuration
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Key: MAHOUT-612
URL: https://issues.apache.org/jira/browse/MAHOUT-612
Project: Mahout
Issue Type: Improvement
Components: Clustering
Affects Versions: 0.4
Reporter: Frank Scholten
Most of the Mahout features require running several jobs in sequence. This can
be done via the command line or using one of the driver classes.
Running and configuring a Mahout job from Java requires using either the
Driver's static methods or creating a String array of parameters and pass them
to the main method of the job. If we can instead configure jobs through a Java
bean or factory we it will be type safe and easier to use in by DI frameworks
such as Spring and Guice.
I have added a patch where I factored out a KMeans MapReduce job plus a
configuration Java bean, from KMeansDriver.buildClustersMR(...)
* The KMeansMapReduceConfiguration takes care of setting up the correct values
in the Hadoop Configuration object and initializes defaults. I copied the
config keys from KMeansConfigKeys.
* The KMeansMapReduceJob contains the code for the actual algorithm running all
iterations of KMeans and returns the KMeansMapReduceConfiguration, which
contains the cluster path for the final iteration.
I like to extend this approach to other Hadoop jobs for instance the job for
creating points in KMeansDriver, but I first want some feedback on this.
One of the benefits of this approach is that it becomes easier to chain jobs.
For instance we can chain Canopy to KMeans by connecting the output dir of
Canopy's configuration to the input dir of the configuration of the KMeans job
next in the chain. Hadoop's JobControl class can then be used to connect and
execute the entire chain.
This approach can be further improved by turning the configuration bean into a
factory for creating MapReduce or sequential jobs. This would probably remove
some duplicated code in the KMeansDriver.
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