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📜 WAYPOINT LESSON

Checkpoint: The Timed Fan-Out Aggregator

⭐⭐⭐ advanced⏳ 25 min read📍 Lesson 140 of 180

Fan out across virtual threads, map failures, preserve order, and state the scaling philosophy.

Checkpoint: the concurrent aggregator

Fan out work across virtual threads, compose partial results with CompletableFuture, bound the whole thing with a timeout, and recover from a failing branch — the four pillars of this module in one method.