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kv: ship timestamp cache summary during lease transfers and range merges #59679

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#60521
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kv: ship timestamp cache summary during lease transfers and range merges#59679
#60521
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nvb
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A-kv-transactionsRelating to MVCC and the transactional model.A-multiregionRelated to multi-regionC-enhancementSolution expected to add code/behavior + preserve backward-compat (pg compat issues are exception)
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@nvb
nvb
opened on Feb 1, 2021

Needed for non-blocking transactions: #52745.
Part of #57688.

Now that we can perform operations in the future of a leaseholder's HLC clock with synthetic timestamps, we must begin shipping summaries of the timestamp cache during lease transfers and range merges.

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A-kv-transactionsRelating to MVCC and the transactional model.A-multiregionRelated to multi-regionC-enhancementSolution expected to add code/behavior + preserve backward-compat (pg compat issues are exception)

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