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## What changes were proposed in this pull request? The method `TaskSchedulerImpl.runningTasksByExecutors()` accesses the mutable `executorIdToRunningTaskIds` map without proper synchronization. In addition, as markhamstra pointed out in #15986, the signature's use of parentheses is a little odd given that this is a pure getter method. This patch fixes both issues. ## How was this patch tested? Covered by existing tests. Author: Josh Rosen <joshrosen@databricks.com> Closes #16073 from JoshRosen/runningTasksByExecutors-thread-safety. |
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