feat: batch TSO requests and low-resolution timestamp cache (#420) - #538
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…mestamp is the highest of the grant (#420)
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Description
Closes #420
Batch TSO requests and add a low-resolution timestamp cache, cutting PD round trips on hot paths.
Changes
PdClientInterface::getTimestampBatch(int $count)requests up to$counttimestamps in a singleTsoRPC; grants are handed out as consecutive values with correct 18-bit logical wrap, never exceeding the granted count.PdClientInterface::getLowResolutionTimestamp()serves a timestamp cached for at mostlowResTimestampMaxStalenessMs(default unset = fresh RPC per call, behaviour unchanged); negative clock age is treated as stale.CheckTxnStatus.current_ts) uses the low-resolution timestamp; start/commit timestamps never do.pessimisticLockBatch()acquires onefor_update_tsper locking pass instead of one per region, saving one PD round trip per additional locked region.for_update_tsand spends only one TSO call.Changelog
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