Re: [HACKERS] Review: GIN non-intrusive vacuum of posting tree

On Mon, Jan 30, 2017 at 4:28 PM, Andrew Borodin <borodin@octonica.com> wrote:
> I'll summarize here my state of studying concurrent methods of page unlinking.
>
> GIN B-tree does not have "high key". That means, that rightmost key on
> a page is maximal for the non-leaf page.
> But I do not see anything theoretical in a way of implementation of
> Lanin and Shasha`s methods of page merging, with slight modifications.
> Their paper does not even mention high key(high fence key in papers by
> Goetz Graefe).
>
> But it's not a simple task due to large portions of shared code
> between entry tree and posting tree.
>
> Also, I do not see a reason why this method can be practically
> superior to proposed patch.
>
> Currently, I do not have resources to implement a proof of concept for
> fully concurrent page unlinking to make benchmarking.

I am marking this patch as returned with feedback.
-- 
Michael