[kv] Batch old value lookups in write path - #4065
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Load distinct RocksDB misses with a single multi-get while preserving pre-write precedence and intra-batch record order. Include multi-get latency in KV read metrics.
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Load distinct RocksDB misses with a single multi-get while preserving pre-write precedence and intra-batch record order. Include multi-get latency in KV read metrics.
Purpose
Linked issue: close #4063
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Tests
API and Format
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