Java Parallel Streams Internals: Overcoming Limitations with flatMap() in Parallel Streams

This video focuses on overcoming the limitations of using flatMap() in Java's parallel streams. In particular, flatMap() forces operations to be sequential, undermining the benefits of parallelism. To address this, two alternative methods are presented. The first employs the map() intermediate operation followed by the reduce(stream::concat) terminal operation, thereby enabling parallel execution and stream flattening. The second utilizes the mapMulti() intermediate operation to achieve similar results but involves more complex syntax. Both methods are shown to outperform flatMap() in supporting parallel operations while flattening nested streams. The ex35 project case study on GitHub is cited for a practical demonstration.