Re: OpenLDAP and Berkeley DB

[Markus Storm <markus.storm@mediaways.net>]

adam jacob wrote:

> In ITS #1176, Keith Bostic from Sleepycat points out some possible data
> corruption issues with regard to the ldbm backend and the Berkeley DB.  I (and
> others I've been speaking with) are experiencing similar symptoms of
> (seemingly random) data corruption occuring in our directories.  Most often,
> it will occur within a heavily used index database, such as an equality
> index on the "mail" attribute. 
>
> It happens on servers under heavy load, which seems consistent with the
> discussion Kurt had with Keith in the ITS report.  
>
> My question is, the ITS report has the fix to this problem commited in HEAD
> and REL_ENG_2... has it been rolled in to openldap-2.0.11?  If so, the problem
> is still in existence.. if it has not, I'll roll a CVS copy of OpenLDAP, and
> test out the fix on some of my problem machines.  
>
> Thanks!
>
> Adam
It's in REL_ENG_2; but looks like there's more to it, we're still seeing 
index corruption running that
version.
Btw, we never had indizes pointing at other people's entries. It's only 
that sometimes, an entry gets
deleted from an index file (while still being there as a record and 
still being present in other indizes).
Also, I'm not sure 'load' is the key. I'm not sure about the DB 
internals, but usually there's no concurrent
WRITE access; I can't imagine read access does any form of writing so 
how could it corrupt the index?

regards,
Markus