zsxwing opened a new pull request #25680: [TODO_JIRA_IS_DOWN][CORE]Use KeyLock to simplify MapOutputTracker.getStatuses URL: https://github.com/apache/spark/pull/25680 ### 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 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.
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