On Fri, Jan 10, 2025 at 3:15 PM Simon Avery
<[email protected]> wrote:

> > > Then I restored another copy from the same minute as the split, and after 
> > > a few hundred HA_ERR_FOUND_DUPP_KEY skips, it started catching up. An 
> > > hour later, it was 0 seconds behind and has stayed in sync.
> >
> > Those errors shouldn't have happened. Are you sure you are running the 
> > master with synv_binlog=1 and the slave with sync_master_info=1, and both 
> > with innodb_flush_log_at_trx_commit=1 ?
>
> sync_binlog is indeed set to 0.   The others are fine.

That would indeed explain it. Unfortunately, any setting other than 1
for this means that your binlogs on the master will be inconsistent
with the state of the data in the tables in case of a crash (or a
snapshot based backup which only gives crash level consistency).
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