infoschema: refine info cache logic to reduce the impact of DDL on information schema cache (#48284) #48362
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Outdated suggestions cannot be applied.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 automated cherry-pick of #48284
What problem does this PR solve?
Issue Number: ref: #48281 close #48285
Problem Summary: refine info cache logic to reduce the impact of DDL on information schema cache
What is changed and how it works?
Do same test in #48285, with this PR, the impact of
failed to get schema version
to stale read QPS is much smaller.The the related metric is following, as you can see, the QPS is much more stable and load snapshot ops is much lower.
Before This PR
Check List
Tests
Side effects
Documentation
Release note
Please refer to Release Notes Language Style Guide to write a quality release note.