[Backport] FrameChannelMerger: Fix incorrect behavior of finished(). (#17088)#17194
Merged
kfaraz merged 1 commit intoapache:31.0.0from Sep 30, 2024
Merged
[Backport] FrameChannelMerger: Fix incorrect behavior of finished(). (#17088)#17194kfaraz merged 1 commit intoapache:31.0.0from
kfaraz merged 1 commit intoapache:31.0.0from
Conversation
Previously, the processor used "remainingChannels" to track the number of non-null entries of currentFrame. Now, "remainingChannels" tracks the number of channels that are unfinished. The difference is subtle. In the previous code, when an input channel was blocked upon exiting nextFrame(), the "currentFrames" entry would be null, and therefore the "remainingChannels" variable would be decremented. After the next await and call to populateCurrentFramesAndTournamentTree(), "remainingChannels" would be incremented if the channel had become unblocked after awaiting. This means that finished(), which returned true if remainingChannels was zero, would not be reliable if called between nextFrame() and the next await + populateCurrentFramesAndTournamentTree(). This patch changes things such that finished() is always reliable. This fixes a regression introduced in PR apache#16911, which added a call to finished() that was, at that time, unsafe.
abhishekagarwal87
approved these changes
Sep 30, 2024
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
3 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Backport #17088