[GitHub] [spark] vanzin opened a new pull request #25317: [SPARK-28584][core] Fix thread safety issue in blacklist timer, tests.

[GitBox <gi...@apache.org>]

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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