Java Parallel Streams Internals: Order of Processing Overview

This video discusses the intricacies of the order of processing in Java's Parallel Streams framework.This framework intentionally allows variability in the processing order, particularly during the "apply" phase. This design offers programmers the flexibility to choose between deterministic and non-deterministic processing. The order of chunk processing by the spliterator is non-deterministic and controlled by the underlying system, including the Common Fork-Join Pool and the OS kernel. This inherent non-determinism enables system-level optimizations, like work-stealing algorithms in the Fork-Join Pool, which improve processor utilization. Moreover, this non-deterministic behavior is not a drawback, but an intentional design choice aimed at efficiency.