I want a n:n join as Cartesian product,but the DataJoinReducerBase looks like only support equal join. I want a non-equal join,but I have no idea now.
2013/3/13 Azuryy Yu <[email protected]> > 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. >>>>>> >>>>> >>>>> >>>> >>> >>
