PartitionSet is a light-weight data structure that represents a set of partitions that are used in parallel processing. This set quite often accompanies a result of partial parallel execution and is used to determine whether or not the entire set of partitions was successfully processed. Note that all PartitionSet operations that take another set as an argument assume that both sets have the same partition count. tb 2011.05.26Coherence 3.7.1

Serialization format indicator.