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Opening in response to the single-shard transaction behavior described in SERVER-39187 and SERVER-37344:
single shard transactions don't send coordinateCommit. And the current behavior is that attempting to recover a single shard transaction commit will make it wait for the coordinator to timeout and then check for the commit state of the transaction locally.
It would be a great improvement if recovering the state of a committed/aborted single-shard transaction did not block for 60 seconds (or transactionLifetimeLimitSeconds).
CC: alyson.cabral.
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