On Tue, Dec 20, 2016 at 2:25 PM, Mithun Cy <mithun...@enterprisedb.com> wrote: > -- I think if it is okay, I can document same for each member of > HashMetaPageData whether to read from cached from meta page or directly from > current meta page. Below briefly I have commented for each member. If you > suggest I can go with that approach, I will produce a neat patch for same.
Plain text emails are preferred on this list. I don't have any confidence in this approach. I'm not sure exactly what needs to be changed here, but what you're doing right now is just too error-prone. There's a cached metapage available, and you've got code accessing directly, and that's OK except when it's not, and maybe we can add some comments to explain, but I don't think that's going to be good enough to really make it clear and maintainable. We need some kind of more substantive safeguard to prevent the cached metapage data from being used in unsafe ways -- and while we're at it, we should try to use it in as many of the places where it *is* safe as possible. My suggestion for a separate structure was one idea; another might be providing some kind of API that's always used to access the metapage cache. Or maybe there's a third option. But this, the way it is right now, is just too ad-hoc, even with more comments. IMHO, anyway. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers