yes, it works for me! I sincerely appreciate your help! thanks!
At 2011-07-26 17:19:34,"Harsh J" <ha...@cloudera.com> wrote: >Ah wait, guess I figured your problem -- you may not be reutilizing >the Configuration instance inside your mapper. > >Override the configure() method in your mapper and get the value out >of the configuration instance passed to the mapper instead of >instantiating a new one (with defaults). > >2011/7/26 rabbit_cheng <rabbit_ch...@126.com>: >> In my map function, I need to know the number of reducer, the code segment >> in my program like this: >> JobConf job = new JobConf(driverClass.class); >> int numReducer=job.getNumReduceTasks(); >> but the function invocation job.getNumReduceTasks() always returns the value >> of "1". I have tested many times: In driver function, I set the number of >> reducer to 2 using the following statements: >> JobConf job =new JobConf(driverClass.class); >> job.setNumReduceTasks(2); >> As a result, the reducers' output file number is 2, so I know the >> statements above worked, but what I get in map function is still to be "1". >> How can I get the right number of reducer in map function? thanks! >> >> >> > > > >-- >Harsh J
