you want a n:n join or 1:n join? On Mar 13, 2013 10:51 AM, "Roth Effy" <[email protected]> wrote:
> 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. >>>>> >>>> >>>> >>> >> >
