public interface Partitioner
ExecutionContextinstances. The usual aim is to create a set of distinct input values, e.g. a set of non-overlapping primary key ranges, or a set of unique filenames.
java.util.Map<java.lang.String,ExecutionContext> partition(int gridSize)
ExecutionContextinstances together with a unique identifier for each one. The identifiers should be short, mnemonic values, and only have to be unique within the return value (e.g. use an incrementer).
gridSize- the size of the map to return