Interface Partitioner
- All Known Implementing Classes:
MultiResourcePartitioner
,SimplePartitioner
public interface Partitioner
Central strategy interface for creating input parameters for a partitioned
step in the form of
ExecutionContext
instances. 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.- Since:
- 2.0
- Author:
- Dave Syer
-
Method Summary
Modifier and TypeMethodDescriptionpartition
(int gridSize) Create a set of distinctExecutionContext
instances together with a unique identifier for each one.
-
Method Details
-
partition
Create a set of distinctExecutionContext
instances 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).- Parameters:
gridSize
- the size of the map to return- Returns:
- a map from identifier to input parameters
-