Interview
summary
Explains how Fork/Join splits tasks by recursive decomposition and uses work stealing so idle threads take subtasks from busy threads, keeping CPUs busy; shows that blocking I/O still reduces throughput unless a ManagedBlocker tells the ForkJoinPool a thread will block so the pool can spawn a compensating thread; demonstrates this prevents stalls across many tasks and keeps parallelism near the core count instead of collapsing when several threads block.
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