Hello, I'm not sure of the setup Redis Labs is using, but vanilla Redis AOF does not allow partially-applied updates. Not for Redis transactions (MULTI/EXEC) nor with scripting. The same happens in the replication channel. In order to enforce this, Redis goes a very long way to avoid partial applications of Lua scripts, more info are in the EVAL page and in the -BUSY error in case of scripts not returning that already made writes.
ah, thank you. I should have checked the docs! It is nice to know that you are writing the script and multi/exec semantics into the AOF log (at least in the default config) and that my guess is wrong.
I still wonder what the details are around the "almost" in "almost always" and stand by the conclusion that "almost atomic" is not the same as "atomic".
My best guess is that the author is referring to the fact that there are no rollbacks in Redis transactions, but I'm not sure. I'll try to ask internally. Thanks!
