Re: [HACKERS] GSoC 2017: weekly progress reports (week 6)

On 09/04/18 18:04, Alvaro Herrera wrote:
> Heikki Linnakangas wrote:
>
>> Remember, the purpose of predicate locks is to lock key ranges, not physical
>> pages or tuples in the index. We use leaf pages as handy shortcut for "any
>> key value that would belong on this page", but it is just an implementation
>> detail.
>
> Hmm ... so, thinking about pending list locking, would it work to
> acquire locks on the posting tree's root of each item in the pending
> list, when the item is put in the pending list? (even if we insert the
> item in the pending list instead of its posting tree).

Hmm, you mean, when inserting a new tuple? Yes, that would be correct. I
don't think it would perform very well, though. If you have to traverse
down to the posting trees, anyway, then you might as well insert the new
tuples there directly, and forget about the pending list.

- Heikki