enhance: [2.5] Use mvcc timestamp as guarantee ts if set (#38980) #39019
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When MvccTimestamp is set, it could be used as guarantee timestamp directly instead of new ts allocated by scheduler reducing the waiting time when delegator has tsafe lag Signed-off-by: Congqi Xia <[email protected]>
Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## 2.5 #39019 +/- ##
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+ Coverage 69.45% 81.05% +11.59%
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Files 294 1383 +1089
Lines 26419 195519 +169100
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+ Hits 18349 158475 +140126
- Misses 8070 31472 +23402
- Partials 0 5572 +5572
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Cherry pick from master
pr: #38980
When MvccTimestamp is set, it could be used as guarantee timestamp directly instead of new ts allocated by scheduler reducing the waiting time when delegator has tsafe lag