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Chukwa >> mail # dev >> About CHUKWA-581,Demux do not support user custom reducer package name.


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About CHUKWA-581,Demux do not support user custom reducer package name.
We can write our own mapper ,because MapProcessorFactory uses
Class.forName(parserClass).getConstructor().newInstance();
since we config the parserClass in config file.

But the ReduceProcessorFactory inits  the reducer class using the classname "org.apache.hadoop.chukwa.extraction.demux.processor.reducer."+ reduceType.
So the reducer class must be put in package org.apache.hadoop.chukwa.extraction.demux.processor.reducer and named reduceType.

Why not we put the reducer  class name in config file either?
For exam, the {customdatatype_mapper} means mapper class ,{customdatatype_reducer} means reducer class.

This can give chukka more flexibility.

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Best regards,

Ivy Tang