On Sun, May 31, 2020 at 9:29 PM Kyle Kingsbury <aphyr@jepsen.io> wrote:
> Right, right. I was thinking "Oh, repeatable read is incomparable with snapshot, so it must be that read committed is
snapshot,and repeatable is serializable."
Right.
We used to call snapshot isolation (i.e., the behavior we now provide
under RR mode) SERIALIZABLE, which was wrong (still is in Oracle).
This was how Postgres worked before the SSI feature was added back in
2011. SSI became the new SERIALIZABLE at that time. Ordinary snapshot
isolation was "demoted" to being called RR mode.
--
Peter Geoghegan