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### What changes were proposed in this pull request? Use `KeyLock` added in #25612 to simplify `MapOutputTracker.getStatuses`. It also has some improvement after the refactoring: - `InterruptedException` is no longer sallowed. - When a shuffle block is fetched, we don't need to wake up unrelated sleeping threads. ### Why are the changes needed? `MapOutputTracker.getStatuses` is pretty hard to maintain right now because it has a special lock mechanism which we needs to pay attention to whenever updating this method. As we can use `KeyLock` to hide the complexity of locking behind a dedicated lock class, it's better to refactor it to make it easy to understand and maintain. ### Does this PR introduce any user-facing change? No ### How was this patch tested? Existing tests. Closes #25680 from zsxwing/getStatuses. Authored-by: Shixiong Zhu <zsxwing@gmail.com> Signed-off-by: Shixiong Zhu <zsxwing@gmail.com> |
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