txn: PessimisticLock with min_commit_ts (#7291) #7328
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Signed-off-by: youjiali1995 <zlwgx1023@gmail.com>
Signed-off-by: youjiali1995 <zlwgx1023@gmail.com>
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cherry-pick #7291 to release-4.0
Signed-off-by: youjiali1995 zlwgx1023@gmail.com
What problem does this PR solve?
Issue Number: close #7289
Problem Summary:
If the primary lock is pessimistic lock and some secondary locks are optimistic locks, these secondary locks will block reads because the pessimistic lock can't be pushed its commit ts.
What is changed and how it works?
What's Changed:
Add
min_commit_tsfield to pessimistic locks andcheck_txn_statuscan push forward it.kvproto: pingcap/kvproto#588
Related changes
Check List
Tests
Side effects
Release note
An issue that optimistic locks may blocks reads if the corresponding primary lock is a pessimistic lock has been fixed.