Hello, I Have the same question at the begining of year 2010 when we start using Hadoop...and we start using NewApi as the old ones are marked depreaceted...
And we spent lot of time using NewApi because not all the feature are not ported in the NewApi (MultipleInputFormat for example..). Following Todd Lipcon advice we start using "Old Api" (which are not so depreaceated according to him..) and since this decision we have not seen an inconvenient using old Api... This is my modest opinion... Regards Alain [@@THALES GROUP RESTRICTED@@] -----Message d'origine----- De : Keith Wiley [mailto:kwi...@keithwiley.com] Envoyé : mercredi 8 février 2012 16:33 À : mapreduce-user@hadoop.apache.org Objet : Re: Good resource to learn .20 API? Thanks! I'll look over those slides in detail, but at a first glance, they doesn't appear to draw a final conclusion on the matter (and they're from 2009)...so, to put it bluntly, which API is the recommended usage at this point? .20 was supposed to make it easier for maintainers of Hadoop to extend, but I'm not aware that it was ever considered to offer major advantages from the users point of view. So for a *user*, is there any advantage to using the .20 API, especially given that one of the most popular books (hint hint) is still only available in a .19 version? (I'm aware of the upcoming May 3rd edition), but I can't wait until then, I've got work to do and have not found good resources for learning .20, unless it really isn't more complicated than a could of slides worth of material. I don't mean to sound antagonistic, I just want to know which API is *recommended* for a new project, not something old that is already embedded in one API or the other? Thanks. On Feb 7, 2012, at 20:04 , Harsh J wrote: > Hey Keith, > > The new API is still unstable, and we continue to support the 0.19 > stable (old) API even in 0.23, but here is a good guide: > http://www.slideshare.net/sh1mmer/upgrading-to-the-new-map-reduce-api > [The first part, from Owen] ________________________________________________________________________________ Keith Wiley kwi...@keithwiley.com keithwiley.com music.keithwiley.com "I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use." -- Galileo Galilei ________________________________________________________________________________
