Hi, inline...
2012/3/25 Radim Kolar <h...@filez.com>: > current implementation of MapWritable and AbstractMapWritable do not track > class usage. Class name is still serialized in write() to disk even if no > instance of such class exists in stored table anymore. > > I propose to add usage tracking to  AbstractMapWritable addToMap(Class > clazz) and provide function removeFromMap which will be called by > MapWritable. I can code such patch,. but i am inexperienced in hadoop > development, What hadoop branch should i target? I would first search to see if a JIRA (https://issues.apache.org/jira/secure/Dashboard.jspa) has already been raised and if not create one. Generally you want to target trunk with your patch. Much more information here: http://wiki.apache.org/hadoop/HowToContribute Cheers, Brock -- Apache MRUnit - Unit testing MapReduce - http://incubator.apache.org/mrunit/