release-19.1: storage/engine: fix re-issued KV writes with most recent seq num #43942
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Fixes cockroachdb#43928. This commit fixes a bug in `MVCCMetadata.GetPrevIntentSeq` that was present since its inception (a147f24). The method was failing to properly look up the previous intent sequence when the last sequence in the sequence history should have been returned. This could cause errors for read-write KV ops like CPut, InitPut, and Increment. This commit does not need to land on master because it was already fixed there by f6a4dc5. It will need to end up on release-19.1 as well though. Release note (bug fix): A SQL row write that is re-issued after already succeeding will no longer throw a duplicate key error when the previous write in its transaction deleted the row.
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knz
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Jan 14, 2020
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Backport 1/1 commits from #43937.
/cc @cockroachdb/release
Fixes #43928.
This commit fixes a bug in
MVCCMetadata.GetPrevIntentSeqthat was presentsince its inception (a147f24). The method was failing to properly look up
the previous intent sequence when the last sequence in the sequence history
should have been returned. This could cause errors for read-write KV ops
like CPut, InitPut, and Increment.
This commit does not need to land on master because it was already fixed
there by f6a4dc5. It will need to end up on release-19.1 as well though.
Release note (bug fix): A SQL row write that is re-issued after
already succeeding will no longer throw a duplicate key error when
the previous write in its transaction deleted the row.