[Date Prev][Date Next] [Chronological] [Thread] [Top]

Re: (ITS#5114) pcache cache results for searches that hit size/timelimit

hyc@symas.com wrote:

> Can you spell out again what behavior you're aiming for?
> I think what makes sense so far is:
> If the client provides a sizelimit, save that away. Forward the request with no 
> sizelimit, so the cache can see everything.


> If the forwarded request hits a sizelimit, I think we can still use the result. 

In principle, yes.  But not with current query containment, because if
the sizelimit is hit, say, with mail=*@example.com, then current query
containment would indicate that mail=foo@example.com is contained in the
sizelimit-hit query, but if mail=foo@example.com exists but is not
contained in the subset of mail=*@example.com that is cached, nothing
would be returned.

> While there's no guarantee that repeated attempts to search the remote server 
> would return the exact same set of entries, there's also no harm done if the 
> cache does so.
> But if the result exceeds the cache's sizelimit, the result set must be 
> uncached, same as now.

Yes, but the query would be cached (as failing), and this would make
query containment behave as above.  I think I'm missing where query
containment can be modified to not check whether a query is contained in
that failing because sizelimit.



Ing. Pierangelo Masarati
OpenLDAP Core Team

SysNet s.r.l.
via Dossi, 8 - 27100 Pavia - ITALIA
Office:  +39 02 23998309
Mobile:  +39 333 4963172
Email:   pierangelo.masarati@sys-net.it