Home | About | Sematext search-lucene.com search-hadoop.com
 Search Hadoop and all its subprojects:

Switch to Threaded View
MapReduce >> mail # user >> Cumulative value using mapreduce

Copy link to this message
Re: Cumulative value using mapreduce

It sounds like a
1) group information by account
2) compute sum per account

If 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 :



On Thu, Oct 4, 2012 at 3:58 PM, Sarath <

> Hi,
> 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?
> Regards,
> Sarath.

Bertrand Dechoux