Improve command-line shell script by allowing default properties files
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Key: MAHOUT-301
URL: https://issues.apache.org/jira/browse/MAHOUT-301
Project: Mahout
Issue Type: New Feature
Components: Utils
Affects Versions: 0.3
Reporter: Jake Mannix
Assignee: Jake Mannix
Priority: Minor
Fix For: 0.4
Snippet from javadoc gives the idea:
{code}
/**
* General-purpose driver class for Mahout programs. Utilizes
org.apache.hadoop.util.ProgramDriver to run
* main methods of other classes, but first loads up default properties from a
properties file.
*
* Usage: run on Hadoop like so:
*
* $HADOOP_HOME/bin/hadoop -jar path/to/job
org.apache.mahout.driver.MahoutDriver [classes.props file] shortJobName \
* [default.props file for this class] [over-ride options, all specified in
long form: --input, --jarFile, etc]
*
* TODO: set the Main-Class to just be MahoutDriver, so that this option isn't
needed?
*
* (note: using the current shell scipt, this could be modified to be just
* $MAHOUT_HOME/bin/mahout [classes.props file] shortJobName [default.props
file] [over-ride options]
* )
*
* Works like this: by default, the file
"core/src/main/resources/driver.classes.prop" is loaded, which
* defines a mapping between short names like "VectorDumper" and fully
qualified class names. This file may
* instead be overridden on the command line by having the first argument be
some string of the form *classes.props.
*
* The next argument to the Driver is supposed to be the short name of the
class to be run (as defined in the
* driver.classes.props file). After this, if the next argument ends in
".props" / ".properties", it is taken to
* be the file to use as the default properties file for this execution, and
key-value pairs are built up from that:
* if the file contains
*
* input=/path/to/my/input
* output=/path/to/my/output
*
* Then the class which will be run will have it's main called with
*
* main(new String[] { "--input", "/path/to/my/input", "--output",
"/path/to/my/output" });
*
* After all the "default" properties are loaded from the file, any further
command-line arguments are taken in,
* and over-ride the defaults.
*/
{code}
Could be cleaned up, as it's kinda ugly with the whole "file named in .props",
but gives the idea. Really helps cut down on repetitive long command lines,
lets defaults be put props files instead of locked into the code also.
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