Re: (ITS#8875) [Patch] Performance problems in back-mdb with large DITs and many aliases

[henrik.bohnenkamp@ionos.com]

On Fri, Jan 25, 2019 at 06:31:41AM -0800, Quanah Gibson-Mount wrote:
> --On Friday, January 25, 2019 1:51 PM +0000 hbohnenkamp@united-internet.de
> wrote:
> 


Hi,

I have now done quite a lot of testing in the way described in my
email from January (Followup 3). I used version 2.4.47, not the HEAD
of the openldap git master branch.

I have found one bug, the one mentioned already in the same email. I
have added a fix for that bug to the patch directory in
https://github.com/hbo/openldap-mdb-deref-problem

I have come across the regression with the back-hdb backend again,
which I also described in my previous email already.  I am now
convinced that this regression is really a problem with the back-hdb
implementation, and I can show it without using my patched
implementation of back-mdb. The demonstration requires a bit more work
to be really presentable and should in any case go into a different
bug report.

Apart from these two issues I have not seen any regressions, and I am
now quite confident that my patch would work reliable in the
environment of my company... no guarantees for anything else :-)  

I have seen that Quanah has suggested to look at ITS#8875 for the
2.4.48 release. Whether there will be a fix in 2.4.48 and whether it
will be based on my patch is of course up to the lead developers (the
change in the DB schema is certainly a strong point against), but this
patch can perhaps serve as something to test the actual fix against.

Best regards
Henrik


--
Henrik Bohnenkamp