Le 22/10/2018 à 17:13, Quanah Gibson-Mount a écrit :
--On Monday, October 22, 2018 9:36 AM +0200 Florent LARTET <florent.lartet@univ-tlse2.fr> wrote:

 I switched back to BDB and it works fine again. I also downgraded to
Master-Slave to ensure the good working as suggested.
 But my initial question is still unanswered. Yes ? No ?

It means it found the entry while doing the presence phase.  However, replication in general (MMR or not) is not safe with 2.4.31, nor is back-mdb in that particular version.  I'd strongly advise upgrading to a current supported release.

Sure, I can attest MDB is not working well ... but BDB worked well for years.
About the version, I'm advising the same thing to myself for a while but a whole big work is necessary around it. Good news is it began some weeks ago.

Thanks for all the informations.