Some end user tests with LMDB branch
abartlet at samba.org
Fri May 11 19:28:22 UTC 2018
On Fri, 2018-05-11 at 11:52 +0200, Denis Cardon wrote:
> G'day Garming, Andrew and all,
> > 0x000021bf is known as WERR_DS_DRA_RECYCLED_TARGET
> > This might actually be expected behaviour (assuming the join still
> > proceeded despite the error). There is a back-off if it discovers that
> > there is a missing link, then it retries with the GET_TGT flag (which
> > Tim implemented for 4.8) -- this used to cause serious problems with
> > Windows joins.
> ok, everything is fine after the join, so I assume it was the issue you
> outlined, as the other server is still a 4.7.7 (actually we haven't
> started 4.8 upgrades, waiting for Andrew's in place upgrade patch to
> make it in the next 4.8 minor release).
> Doing a little more testing, ldapcmp is happy comparing between a 4.7.7
> and LMDB branch, and everything is fine. By the way, the test is done on
> small, but real world database copy with about two years of
> For the tooling, is there something like ldbsearch for querying lmdb
> files, or we just have to query using ldbsearch on sam.ldb file itself
> (which is working properly by the way)?
ldbsearch with mdb:// or ldb:// as the prefix is what you need to do.
> If all the testing goes well, I am thinking about upgrading one small
> primary school on LMDB to get live feedback. What would be the rollback
> procedure to go back to a 4.8 tdb database if needed? Since the database
> format is completly different, I guess it won't be as easy as the 4.8 to
> 4.7 GUID index fixing. I was thinking about keeping a firewalled Samba
> 4.8 replicating with Samba LMDB, and switching the two (or a backup of
> the 4.8 instance) if needed. Do you have better ideas?
ldbdump has been taught about the mdb file format, so the backend files
can be re-constructed by dumping each one, rebuilding as raw tdb then
re-connecting to the sam.ldb. However as there isn't an auto-upgrade
I've not provided an auto-downgrade. In general it is better to do
these things over DRS replication (ie a join as you have done).
Thank you so much for giving this a go!
Andrew Bartlett http://samba.org/~abartlet/
Authentication Developer, Samba Team http://samba.org
Samba Developer, Catalyst IT http://catalyst.net.nz/services/samba
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