* Dave Page <[EMAIL PROTECTED]> [080529 12:03]: > On Thu, May 29, 2008 at 4:48 PM, Douglas McNaught <[EMAIL PROTECTED]> wrote:
> > I think the idea is that WAL records would be shipped (possibly via > > socket) and applied as they're generated, rather than on a > > file-by-file basis. At least that's what "real-time" implies to me... > > Yes, we're talking real-time streaming (synchronous) log shipping. But synchronous streaming doesn't mean the WAL has to be *applied* on the salve yet. Just that it has to be "safely" on the slave (i.e on disk, not just in kernel buffers). The whole single-threaded WAL replay problem is going to rear it's ugly head here too, and mean that a slave *won't* be able to keep up with a busy master if it's actually trying to apply all the changes in real-time. Well, actually, if it's synchronous, it will keep up, but it just means that now your master is IO capabilities is limited to the speed of the slaves single-threaded WAL application. a. -- Aidan Van Dyk Create like a god, [EMAIL PROTECTED] command like a king, http://www.highrise.ca/ work like a slave.
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