Hi Is there a way to make MapReduce create exactly N Mappers? More specifically, if say my data can be split to 200 Mappers, and I have only 100 cores, how can I ensure only 100 Mappers will be created? The number of cores is not something I know in advance, so writing a special InputFormat might be tricky, unless I can query Hadoop for the available # of cores (in the entire cluster).
Thanks Shai
