mirror of https://github.com/apache/druid.git
6fac267f17
* MSQ: Improved worker cancellation. Four changes: 1) FrameProcessorExecutor now requires that cancellationIds be registered with "registerCancellationId" prior to being used in "runFully" or "runAllFully". 2) FrameProcessorExecutor gains an "asExecutor" method, which allows that executor to be used as an executor for future callbacks in such a way that respects cancellationId. 3) RunWorkOrder gains a "stop" method, which cancels the current cancellationId and closes the current FrameContext. It blocks until both operations are complete. 4) Fixes a bug in RunAllFullyWidget where "processorManager.result()" was called outside "runAllFullyLock", which could cause it to be called out-of-order with "cleanup()" in case of cancellation or other error. Together, these changes help ensure cancellation does not have races. Once "cancel" is called for a given cancellationId, all existing processors and running callbacks are canceled and exit in an orderly manner. Future processors and callbacks with the same cancellationId are rejected before being executed. * Fix test. * Use execute, which doesn't return, to avoid errorprone complaints. * Fix some style stuff. * Further enhancements. * Fix style. |
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