vanzin opened a new pull request #25317: [SPARK-28584][core] Fix thread safety issue in blacklist timer, tests. URL: https://github.com/apache/spark/pull/25317 There's a small, probably very hard to hit thread-safety issue in the blacklist abort timers in the task scheduler, where they access a non-thread-safe map without locks. In the tests, the code was also calling methods on the TaskSetManager without holding the proper locks, which could cause threads to call non-thread-safe TSM methods concurrently.
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