Sorry, I think I have mistook your problem.I thought you want share data in the different calls of the map() method in the same MapTask Hope anyone else can help you [?]
2009/6/16 Hello World <snowlo...@gmail.com> > Thanks for your reply. I tried as you said that init some data in setup() > and read them from map(), it did work, but it still seems that each map > task > did its own setup() seperately and they are using different datas, so this > does not match what I need. I want to share some common datas amongst > different map tasks (these datas are read-only after initialization). So is > there any other way? > > > On Tue, Jun 16, 2009 at 9:28 AM, Eason.Lee <leongf...@gmail.com> wrote: > > > I think you can just define the data structures in your map classinit it > in > > setup(Context context) and use it in your map method > > hope it is helpful! > > > > 2009/6/16 snowloong <snowlo...@gmail.com> > > > > > Hi, > > > I want to share some data structures for the map tasks on a same > node(not > > > through files), I mean, if one map task has already initialized some > data > > > structures (e.g. an array or a list), can other map tasks share these > > > memorys and directly access them, for I don't want to reinitialize > these > > > datas and I want to save some memory. Can hadoop help me do this? > > > thanks > > > > > > 2009-06-16 > > > > > > > > > > > > snowloong > > > > > >
