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MXS-1507: Clarify transaction replay limitations

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Only transactions that return identical results can be replayed.
This commit is contained in:
Markus Mäkelä
2018-04-23 11:43:28 +03:00
parent 7de7e7b2fe
commit cb5917b346
1 changed files with 3 additions and 2 deletions
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5
Documentation/Routers/ReadWriteSplit.md
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@ -351,8 +351,9 @@ are met, the transaction can be safely replayed.
* The replacement server where the transaction is applied returns results
identical to the original partial transaction.
If the results from the replacement server are not identical when the
transaction is replayed, the client connection is closed.
If the results from the replacement server are not identical when the transaction is
replayed, the client connection is closed. This means that any transaction with a server
specific result (e.g. `NOW()`, `@@server_id`) cannot be replayed.
Performing MVCC reads (`SELECT` queries without `FOR UPDATE` or `LOCK IN SHARE MODE`)
with transaction replay is discouraged. If such statements are executed