Re: back-meta hangs

[Pierangelo Masarati <ando@sys-net.it>]

Sébastien Georget wrote:

> First I set threads=2 in slapd.conf.
>
> Using 'charge' (http://sourceforge.net/projects/loadtesting/), I start 
> 2 threads (clients) doing the following : bind, search base dc=domain, 
> unbind.
> Almost every time the server hangs. If I hit ctrl-c I returns the 
> following message and I have to kill it :
>   slapd shutdown: waiting for 4 threads to terminate
>
> Notes :
> - If I replace the search with base o=A|B,dc=domain there is no problem.
> - With the default configuration (threads=16) I have to launch 17 
> clients to freeze slapd.
>
> I can produce a full log (67KB) of this scenario if you want. 


I've fixed the problem in HEAD; a similar fix also applies to back-ldap, 
although might be a bit more difficult to trigger.  I'll try to backport 
to 2.2 asap.

> > This is the intended usage; if all databases reside on the same 
> > server and you don't need to rewrite or do some fancy stuff, I 
> > suggest you create a third bdb instance rooted at "dc=domain", and 
> > glue the three together using the "subordinate" qualifier in the two 
> > subordinate databases.
>
> I use two bdb + a meta because I have read-write access to A, and B is 
> a replica of another site (using syncrepl). 

backglue can be used regardless of the type of database (e.g. shadow or 
not).  I think a backglue approach is preferable to back-meta when all 
data resides in the same DSA.

p.



   SysNet - via Dossi,8 27100 Pavia Tel: +390382573859 Fax: +390382476497