[Backport] Dart: Smoother handling of stage early exit (#17228) (#17069)#17256
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kfaraz merged 2 commits intoapache:31.0.0from Oct 5, 2024
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[Backport] Dart: Smoother handling of stage early exit (#17228) (#17069)#17256kfaraz merged 2 commits intoapache:31.0.0from
kfaraz merged 2 commits intoapache:31.0.0from
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…apache#17069) * MSQ: Properly report errors that occur when starting up RunWorkOrder. In apache#17046, an exception thrown by RunWorkOrder#startAsync would be ignored and replaced with a generic CanceledFault. This patch fixes it by retaining the original error.
Stages can be instructed to exit before they finish, especially when a downstream stage includes a "LIMIT". This patch has improvements related to early-exiting stages. Bug fix: - WorkerStageKernel: Don't allow fail() to set an exception if the stage is already in a terminal state (FINISHED or FAILED). If fail() is called while in a terminal state, log the exception, then throw it away. If it's a cancellation exception, don't even log it. This fixes a bug where a stage that exited early could transition to FINISHED and then to FAILED, causing the overall query to fail. Performance: - DartWorkerManager previously sent stopWorker commands to workers even when "interrupt" was false. Now it only sends those commands when "interrupt" is true. The method javadoc already claimed this is what the method did, but the implementation did not match the javadoc. This reduces the number of RPCs by 1 per worker per query. Quieter logging: - In ReadableByteChunksFrameChannel, skip logging exception from setError if the channel has been closed. Channels are closed when readers are done with them, so at that point, we wouldn't be interested in the errors. - In RunWorkOrder, skip calling notifyListener on failure of the main work, in the case when stop() has already been called. The stop() method will set its own error using CanceledFault. This enables callers to detect when a stage was canceled vs. failed for some other reason. - In WorkerStageKernel, skip logging cancellation errors in fail(). This is made possible by the previous change in RunWorkOrder.
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Backport the following patches:
#17069
#17228