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Re: Synchronizing two mirror mode clusters
I assume that ITS7830 (MDB_MAP_FULL with lots of modifications and
read access) is the same as ITS7904,
and would be solved by a 'dreamcatcher' feature.
2014-10-22 16:26 GMT+04:00 Meunier, Antonin <antonin.meunier@cgi.com>:
> Hello,
>
> I currently have several problems with MMR with lots of modification of data made in the Ldap :
> - ITS 7830 (http://www.openldap.org/its/index.cgi/Incoming?id=7830;selectid=7830) --> MDB_MAP_FULL with lots of modifications and read access
> - http://www.openldap.org/lists/openldap-technical/201408/msg00152.html --> Pb with Modify in big groups. I reproduce in MDB but not in hdb (perhaps is it a problem with the OS and the management of its memory)
> - http://www.openldap.org/lists/openldap-technical/201409/msg00165.html --> Delay with ADD and DEL synchronisation with at the end no DEL on the replica
> - http://www.openldap.org/lists/openldap-technical/201409/msg00171.html --> Full sync of an empty ldap with a full ldap - modified entry on the full ldap are not replicated on the empty (greater than snapshot)
>
> I cannot for the moment test with 2.4.40 but i'll try it soon.
>
>
> -----Message d'origine-----
> De : openldap-technical [mailto:openldap-technical-bounces@openldap.org] De la part de Quanah Gibson-Mount
> Envoyé : lundi 20 octobre 2014 21:34
> À : Леонид Юрьев
> Cc : openldap-technical@openldap.org
> Objet : Re: Synchronizing two mirror mode clusters
>
> --On Saturday, October 18, 2014 9:11 PM +0400 Леонид Юрьев <leo@yuriev.ru> wrote:
>
>> Sorry, but currently I strongly not recommended multi-master.
>> We have a big troubles in the same case, but most high load.
>>
>> I am currently working on the two major issues:
>> - syncrepl seems unreliable, survives no more than 3-5 min under a
>> stress test (ITS#7968).
>> - fix of ITS#7904 does not affect syncrepl, thereby MDB_MAP_FULL may
>> occur in case of LMDB backed (no ITS now).
>>
>> But another couple seem be forever:
>> - replication is significantly slowdown if are more than 3 nodes.
>> - replication may never be completed until all ldap-write activities
>> are stopped.
>
> Test cases? ITS reports?
>
> Also, I personally use delta-syncrepl vs straight syncrepl.
>
> --Quanah
>
>
> --
>
> Quanah Gibson-Mount
> Server Architect
> Zimbra, Inc.
> --------------------
> Zimbra :: the leader in open source messaging and collaboration
>