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Erik Johnston fa8934b175 Reduce serialization errors in MultiWriterIdGen (#8456 )

We call `_update_stream_positions_table_txn` a lot, which is an UPSERT
that can conflict in `REPEATABLE READ` isolation level. Instead of doing
a transaction consisting of a single query we may as well run it outside
of a transaction.

2020-10-07 17:08:58 +01:00

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Reduce number of serialization errors of `MultiWriterIdGenerator._update_table`.