Jeff, Chris Olston answered this a while back: http://markmail.org/thread/xnwutstlftnyycxs
(by the way, MarkMail is awesome for searching mailing list archives. Highly recommended.) There are some changes that have to do with sampling and multi-store, but that email will give you the general idea. Also, remember you can always get the MR plan by running "describe" on a relation. Hope this helps -Dmitriy On Wed, Jul 8, 2009 at 6:24 PM, zhang jianfeng <zjf...@gmail.com> wrote: > Hi all, > > > I found that the following script will be converted into 3 mapreduce jobs: > > A = *LOAD* '/user/zjffdu/input.txt' *USING* PigStorage(); > > B = *GROUP* A *BY* $0; > > B = *FOREACH* B *GENERATE* *group*,COUNT($1); > > B = *ORDER* B *BY* $1; > > *DUMP* B; > > I am very interested to know How Pig compile the script to jobs, reading > the > source code is a way, but If there’s any document, that would be better. > Does anyone know where can I find the related documents ? Or is there any > JIRA item related to this ? > > Thank you in advance. > > > > Jeff Zhang. >
