org.apache.mahout.driver
Class MahoutDriver
java.lang.Object
org.apache.mahout.driver.MahoutDriver
public final class MahoutDriver
- extends Object
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.
To run locally:
$MAHOUT_HOME/bin/mahout run shortJobName [over-ride ops]
Works like this: by default, the file "driver.classes.props" is loaded from the classpath, which
defines a mapping between short names like "vectordump" and fully qualified class names.
The format of driver.classes.props is like so:
fully.qualified.class.name = shortJobName : descriptive string
The default properties to be applied to the program run is pulled out of, by default, ".props"
(also off of the classpath).
The format of the default properties files is as follows:
i|input = /path/to/my/input
o|output = /path/to/my/output
m|jarFile = /path/to/jarFile
# etc - each line is shortArg|longArg = value
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).
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.
So if your driver.classes.props looks like so:
org.apache.mahout.utils.vectors.VectorDumper = vecDump : dump vectors from a sequence file
and you have a file core/src/main/resources/vecDump.props which looks like
o|output = /tmp/vectorOut
s|seqFile = /my/vector/sequenceFile
And you execute the command-line:
$MAHOUT_HOME/bin/mahout run vecDump -s /my/otherVector/sequenceFile
Then org.apache.mahout.utils.vectors.VectorDumper.main() will be called with arguments:
{"--output", "/tmp/vectorOut", "-s", "/my/otherVector/sequenceFile"}
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
main
public static void main(String[] args)
throws Throwable
- Throws:
Throwable
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