Bharath, The mapred package is largely deprecated, as hadoop is moving towards the mapreduce package. Use mapreduce for any new jobs you write, because mapred will go away in some future release. For now, both are there to give developers time to rewrite existing older jobs.
Kevin On Sat, Oct 3, 2009 at 10:29 AM, bharath vissapragada < [email protected]> wrote: > Tom and Chris , > > Thanks for your replies .. I have seen thr o.a.h.mapred.jobcontrol.Job > and o.a.h.mapreduce.Job .. Only one of them has the above option of > adding a dependent Jobs .. Can anyone tell me the difference between > "mapred" and "mapreduce" packages .. > > Thanks in advance > > On 10/2/09, Chris K Wensel <[email protected]> wrote: > > You might find the Cascading project quite useful in this regard. > > > > http://www.cascading.org/ > > > > using MapReduceFlow and CascadeConnector classes, you can chain > > arbitrary MR jobs together. Cascading will determine the dependencies, > > if any, and run the jobs in topological order (independent jobs will > > be submitted to run in parallel). > > > > you may also find writing your own MR jobs by hand tedious and > > brittle. Cascading can help you there as well. > > > > cheers, > > chris > > > > On Oct 2, 2009, at 3:29 AM, bharath v wrote: > > > >> Hi all, > >> > >> I have a set of map red jobs which need to be cascaded ,i.e, output > >> of MR > >> job1 is the input of MR job2. etc.. > >> > >> Can anyone point me to the corresponding classes in hadoop 0.20.0 API? > >> > >> I have seen "x.addDependingJob(y)" function in the yahoo's hadoop > >> tutorial > >> but that is for the older versions.. > >> What is the similar thing in 0.20.0 API? > >> > >> Any help is appreciated , > >> > >> Thanks > >> bharath.v > >> ug3 > >> IIIT Hyderabad! > > > > -- > > Chris K Wensel > > [email protected] > > http://www.concurrentinc.com > > > > >
