I want to join two table data in reducer.So I need to find the start of the table. someone said the DataJoinReducerBase can help me,isn't it?
2013/3/13 Azuryy Yu <[email protected]> > you cannot use RecordReader in Reducer. > > what's the mean of you want get the record position? I cannot understand, > can you give a simple example? > > > On Wed, Mar 13, 2013 at 9:56 AM, Roth Effy <[email protected]> wrote: > >> sorry，I still can't understand how to use recordreader in the >> reduce(),because the input is a RawKeyValueIterator in the class >> reducecontext.so,I'm confused. >> anyway,thank you. >> >> >> 2013/3/12 samir das mohapatra <[email protected]> >> >>> Through the RecordReader and FileStatus you can get it. >>> >>> >>> On Tue, Mar 12, 2013 at 4:08 PM, Roth Effy <[email protected]> wrote: >>> >>>> Hi,everyone, >>>> I want to join the k-v pairs in Reduce(),but how to get the record >>>> position? >>>> Now,what I thought is to save the context status,but class Context >>>> doesn't implement a clone construct method. >>>> >>>> Any help will be appreciated. >>>> Thank you very much. >>>> >>> >>> >> >
