No, there is no way to get the number of values for a current key.
==> BTW, the iterators given to Reduce are one-time use iterators, right? Hadoop-5266 introduced mark/reset support for values iterator. You may want to take a look at that. Cheers Jothi On 6/15/09 7:07 AM, "jason hadoop" <jason.had...@gmail.com> wrote: > It would be nice if there was an interface compliant way. Perhaps it becomes > available in the 0.20 and beyond api's. > > On Sat, Jun 13, 2009 at 3:40 PM, Rares Vernica <rvern...@gmail.com> wrote: > >> Hello, >> >> In Reduce, can I get the number of values for the current key without >> iterating over them? Does Hadoop has this number? >> >> Or, at least the total number of pairs that will be processed by the >> current Reduce instance. I am pretty sure that Hadoop already knows >> this number because it sorted them. >> >> BTW, the iterators given to Reduce are one-time use iterators, right? >> >> Thanks! >> Rares >> > >
