Thank you for your reply Harsh J. I really need this feature, because this will boost up execution of my use case a lot. Could you give me a hint where to look in the sources to get a good starting point for implementation? Which classes are involved?
> Hi Eduard, > > This isn't impossible, just unavailable at the moment. See > https://issues.apache.org/jira/browse/MAPREDUCE-199 if you want to > take a shot at implementing this. HBase would love to have this, I > think. > > On Mon, Aug 27, 2012 at 10:41 PM, Eduard Skaley <e.v.ska...@gmail.com> wrote: >> Hi, >> >> i have a question concerning the execution of reducers. >> To use effectively the data locality of blocks in my use case i want to >> control on which node a reducer will be executed. >> >> In my scenario i have a chain of map-reduce jobs where each job will be >> executed by exactly N reducers. >> I want to achieve that for each job reducer 1 is executed on node 1, >> reducer 2 on node 2 and so on. >> >> Is it possible with a customization of the BlockPlacementPolicy in MRv2 ? >> Or is there some other way, maybe some indirect ? Or is it impossible ? >> >> Thanks for your help. >> Eduard > >
