[Cherry Pick] Fix race condition for transaction cache (#20875) #20882
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Bug was (likely) as follows:
Reader thread | Writer thread (state sync)
invalidate tickets
get ticket
miss cache
read database
insert to cache insert to cache (racing)
ticket is valid
panic
write to database
The writer thread must insert to db first so that the db read
cannot find an old value while holding a valid ticket
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Bug was (likely) as follows:
The writer thread must insert to db first so that the db read
cannot find an old value while holding a valid ticket
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