perf: Avoid creating processing buffers beyond what is needed.#19426
Open
gianm wants to merge 3 commits intoapache:masterfrom
Open
perf: Avoid creating processing buffers beyond what is needed.#19426gianm wants to merge 3 commits intoapache:masterfrom
gianm wants to merge 3 commits intoapache:masterfrom
Conversation
In Dart, processing buffers are sliced up from the merge buffer. For stages that do not use all processing threads -- perhaps because they do not have enough inputs -- we can be more efficient with memory by slicing the merge buffer based on the actual number of processors, not the number of processing threads. This patch addresses it by deferring the choice of how many buffers are needed until the stage actually starts executing. At that point, it knows how many processors it will create.
github-actions
Bot
added
Area - Batch Ingestion
Area - MSQ
FrankChen021
reviewed
May 7, 2026
Member
FrankChen021
left a comment
FrankChen021
left a comment
There was a problem hiding this comment.
I have reviewed the code for correctness, edge cases, concurrency, and integration risks; no issues found.
This is an automated review by Codex GPT-5
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
2 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Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be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.
In Dart, processing buffers are sliced up from the merge buffer. For stages that do not use all processing threads -- perhaps because they do not have enough inputs -- we can be more efficient with memory by slicing the merge buffer based on the actual number of processors, not the number of processing threads.
This patch addresses it by deferring the choice of how many buffers are needed until the stage actually starts executing. At that point, it knows how many processors it will create.