Bertrand is almost right.
Hi,It sounds like a1) group information by account2) compute sum per accountIf that not the case, you should precise a bit more about your context.This computing looks like a small variant of wordcount. If you do not know how to do it, you should read books about Hadoop MapReduce and/or online tutorial. Yahoo's is old but still a nice read to begin with : http://developer.yahoo.com/hadoop/tutorial/Regards,Bertrand--On Thu, Oct 4, 2012 at 3:58 PM, Sarath <firstname.lastname@example.org> wrote:
I have a file which has some financial transaction data. Each transaction will have amount and a credit/debit indicator.
I want to write a mapreduce program which computes cumulative credit & debit amounts at each record
and append these values to the record before dumping into the output file.
Is this possible? How can I achieve this? Where should i put the logic of computing the cumulative values?