tikv: add size limit to batch get cache (#21015) #21129
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cherry-pick #21015 to release-4.0
What problem does this PR solve?
Issue Number: close #19560
The internal cache used by
BatchGetneed a size limit, it is OK to randomly discard some entry in it.What is changed and how it works?
Add a size limit which equals to default
TxnTotalSizeLimit. We can delete some entry from it randomly when the limit is exceeded.Release note