Dmitriy , Thank you for your help.
On Thu, Jul 9, 2009 at 9:34 AM, Dmitriy Ryaboy <dvrya...@cloudera.com>wrote: > 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. > > >
