On Mar 18, 2012, at 11:43 AM, Daniel Nichter wrote: > Let me add re: #2 (and #3): it seems we have two evils to choose from. The > first, the old docs, is having two systems of replication: streams and slave. > It would be nice if we had only streams and everything was pure and simple, > but slave wasn't built that way. That's a problem because slave is, I highly > suspect, the very first thing people will turn to. It is, after all, > Drizzle's "native" system of replication, yet it's also not.
Why is it not "native"? > The second is having one system of replication with a fudged, oddball premier > member: slave. A very astute reader of the docs will immediately notice > (before Details) that slave doesn't truly fit the paradigm, but I hope my > literary prowess was clever enough to keep the user dreaming of their super > awesome slave-based Drizzle replication system before they realized the truth > or read Details. > > I favor the second evil because I think, going forward, maybe/hopefully > someday Drizzle will have a native replication system that's pure replication > stream. If yes, then we won't have to disrupt the established paradigm. If > no, then the true nature of the slave plugin will remain a hacker's delight > and maybe a Drizzle DBA certification question: "Explain why the slave plugin > is not a true TransactionApplier." The whole Replicator/Applier was around before we had a reliable transaction log, which we now have in the InnoDB replication log. Personally, I'd like to kill off the Replicator/Applier pattern since it does not have the guarantee that events received have been safely committed on the master (long discussion on that is beyond the scope of this email). Also, I find it slightly awkward, though I do understand the concept behind it. If it were up to me, I'd promote that future plugins follow the style of the slave plugin and read from the InnoDB replication log which DOES have this guarantee. Having the two paradigms, though flexible, is confusing, I think. But again, that's beyond the scope of this discussion. -Dave _______________________________________________ Mailing list: https://launchpad.net/~drizzle-discuss Post to : [email protected] Unsubscribe : https://launchpad.net/~drizzle-discuss More help : https://help.launchpad.net/ListHelp
