Hi!
Don't be so eager.
Replication will break in funny ways when a 5.1 master will get a v5 event.
??? what do you mean?
In the best scenario, all mysql4 slaves stop replicating at once, overloading the 5.1 ones and leading the wiki to a halt.
We can run the site off a single slave, usually (well, probably need to send watchlists to blackhole for a while, but.. ;-)
Domas ends up removing the offending statement with a hex editor or upgrading all the slaves in a hurry.
Who in the sane mind upgrades masters before slaves?
Do we have at least one 5.1 slave per 5.1-mastered pool ?
Did we have ever any non-5.1 slave per 5.1-mastered pool?
Domas