The old Hadoop JobConf class is a subclass of the new Configuration
class. Unforch, some classes still require the JobConf class when they
don't use any of it's methods, and use it as a Configuration. This
means that when your code uses Configuration, you can't use one of the
old-school classes when really you could.
The org.apache.mahout.common.parameters.Parameter classes should all
take Configuration in the constructors, if they have constructors
(some don't). Some still take JobConif and then upcast them with the
super() call.
This make it hard to write a DistanceMeasure that takes a parameter:
TanimotoDistanceMeasure takes two: PathParameter is in the second
list, and it makes a Vector Parameter using the ClassParameter
extension which is also in the second list. I'm using the
ClassParameter dodge to make a Double Parameter that works with a
Configuration.
These take a JobConf in the constructor:
StringParameter
IntegerParameter
FileParameter
DoubleParameter
This takes a Configuration in some methods:
Parametered Interface
These take a Configuration in the constructor:
PathParameter
CompositeParameter
ClassParameter
AbstractParameter
I have not done a sweep of the source base to find other instances of
this. Not being a committer, it's not really pointful.
--
Lance Norskog
[email protected]
