Fair enough, thanks for the input! Cheers
/Marcus On Thu, Jul 9, 2009 at 7:03 PM, Miles Osborne <[email protected]> wrote: > if you have <key,value> pairs, then have your mapper emit > > <value,<key,value>> > > this will result in your data being resorted by the value > > Miles > > 2009/7/9 Marcus Herou <[email protected]> > > > Really ? WIll that work ? > > > > input something like this > > > > tag > > tag2 > > tag > > tag2 > > tag3 > > ... > > produces output > > > > tag 2 > > tag2 2 > > tag3 1 > > .... > > > > Swapping key/value will then map all 2's to what ? > > > > > > > > On Thu, Jul 9, 2009 at 4:53 PM, jason hadoop <[email protected]> > > wrote: > > > > > The simplest way is to swap the key and value in your mapper's output, > > then > > > swap them back afterward. > > > > > > On Thu, Jul 9, 2009 at 7:52 AM, Marcus Herou < > [email protected] > > > >wrote: > > > > > > > Hi many times I want to sort by value instead of key. > > > > > > > > For instance when counting the top used tags in blog posts or the ten > > > most > > > > visited pages on a certain site and so on. > > > > > > > > Wondering if that is even possible with hadopp or if I need to > process > > > the > > > > file outside of hadoop. > > > > > > > > Cheers > > > > > > > > /Marcus > > > > > > > > -- > > > > Marcus Herou CTO and co-founder Tailsweep AB > > > > +46702561312 > > > > [email protected] > > > > http://www.tailsweep.com/ > > > > > > > > > > > > > > > > -- > > > Pro Hadoop, a book to guide you from beginner to hadoop mastery, > > > http://www.amazon.com/dp/1430219424?tag=jewlerymall > > > www.prohadoopbook.com a community for Hadoop Professionals > > > > > > > > > > > -- > > Marcus Herou CTO and co-founder Tailsweep AB > > +46702561312 > > [email protected] > > http://www.tailsweep.com/ > > > > > > -- > The University of Edinburgh is a charitable body, registered in Scotland, > with registration number SC005336. > -- Marcus Herou CTO and co-founder Tailsweep AB +46702561312 [email protected] http://www.tailsweep.com/
