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Re: comments on parallel applying
On Fri, Jul 4, 2014 at 10:26 AM, Kristian Nielsen <knielsen@xxxxxxxxxxxxxxx>
> Jonas Oreland <jonaso@xxxxxxxxxx> writes:
> > <quick thoughts on implementation>
> > for row-based replication this seems quite "easy".
> > for statement-based replication i image that you would have to add hooks
> > into the "real" code
> > after parsing has been performed, but before the actual execution is
> > started (and yes, i know that there is sometimes a blurry line here)
> > </thoughts>
> A different approach could be to do this on the master.
> When a transaction is binlogged, we have easy access to most/all of this
> information. And there is room in the GTID event at the start of every
> event group to save this information for the slave. Then the slave has the
> information immediately when it starts scheduling events for parallel
> execution. So this does not sound too hard. Though the amount of
> that can be provided is then somewhat limited for space and other reasons,
or perhaps a hybrid approach.
master does "interesting" annotations
slave takes decision based on annotations *and* own analysis