On Thursday, June 13, 2019 5:27:35 PM MSK Vladimir Davydov wrote:
> On Sun, Jun 09, 2019 at 11:44:39PM +0300, Georgy Kirichenko wrote:
> 
> Again, looks like a temporary hack to me. I would rather not commit it.
> The right way would be getting rid of the schema_lock. I know that you
> have tried, but failed because of vylog. I'll look what we can do about
> it.
I failed to remove the latch from checkpoint not from ddl. Removing the latch 
from alter.cc doesn't look possible in the next 2-3 month.