changefeed,kvcoord: populate AC headers for backfill work #90093
Conversation
This file contains 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
This is an opportunistic change and something to backport to v22.2. In v22.2 we introduced a disabled-by-default elastic CPU limiter (cockroachdb#86638) to dynamically grant CPU time for background work like backups -- something hope to enable-by-default in CC and under observation for select 22.2 clusters. Recently we found another use for this limiter -- rangefeed catchup scans (cockroachdb#89709). It's unclear yet whether we want that integration to make it back to v22.2 but this commit leaves that option open by populating the right AC headers we'd need for the integration. Populating these AC headers are safe -- the Rangefeed RPC is not hooked into AC yet, so these headers are not looked at. For the initial scan requests we're only setting a lower priority bit, something 22.1 nodes already know to handle (they do so for all batch requests). Release note: None
|
This change is |
miretskiy
approved these changes
Oct 17, 2022
|
Thanks! bors r+ |
|
Build succeeded: |
This was referenced Oct 17, 2022
sumeerbhola
reviewed
Oct 18, 2022
There was a problem hiding this comment.
@irfansharif I believe this fixes #88733
Reviewed 2 of 4 files at r1.
Reviewable status:complete! 0 of 0 LGTMs obtained
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
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Outdated suggestions cannot be applied.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.
This is an opportunistic change and something to backport to v22.2. In v22.2 we introduced a disabled-by-default elastic CPU limiter (#86638) to dynamically grant CPU time for background work like backups -- something hope to enable-by-default in CC and under observation for select 22.2 clusters. Recently we found another use for this limiter -- rangefeed catchup scans (#89709). It's unclear yet whether we want that integration to make it back to v22.2 but this commit leaves that option open by populating the right AC headers we'd need for the integration. Populating these AC headers is safe -- the Rangefeed RPC is not hooked into AC yet, so these headers are not looked at. For the initial scan requests we're only setting a lower priority bit, something 22.1 nodes already know to handle (they do so for all batch requests).
Release note: None
Release justification: Low-risk change that opens the door to a future backport in a non-.0 release to address cases where rangefeed catchup scans affect foreground latencies.