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N-way replication "dn_callback : entries have identical CSN"
- To: firstname.lastname@example.org
- Subject: N-way replication "dn_callback : entries have identical CSN"
- From: Adrien Futschik <email@example.com>
- Date: Wed, 18 Feb 2009 09:24:32 +0100
- Content-disposition: inline
- Organization: Atos Origin
- User-agent: KMail/1.11.0 (Linux/22.214.171.124-170.2.24.fc10.i686.PAE; KDE/4.2.0; i686; ; )
I am still working on n-way multi master replication. I am using
refreshAndPersist mode with to masters.
My first test was to inject in parallel 2 x 500 entries to the first master and
also 2 x 500 entries to the second master.
The goal is to see how the replication behaves when massive adds are performed
to both masters.
When I used OpenLDAP 2.4.11, I suffered lost. The 1000 entries where
successfully added on each master, but a few entries where lost in the
replication process. I didn't found any "errors" in the log, even with debug
The only suspect messages I had, where like this :
=> bdb_idl_insert_key: c_put id failed: DB_LOCK_DEADLOCK: Locker killed to
resolve a deadlock (-30995)
=> bdb_dn2id_add 0x543: parent (ou=clients,o=edf,c=fr) insert failed: -30995
I then switched to OpenLDAP 2.4.14 and did not have the problem anymore (same
configuration). I guess this was a bug form 2.4.11.
Still, I had a few of theses messages in the log :
conn=9 op=1 => bdb_dn2id_add
dn="cn=M2client2@laposte.net,ou=clients,o=edf,c=fr" ID=0xb: put failed:
DB_LOCK_DEADLOCK: Locker killed to resolve a deadlock -30995
but I also got a few of theses :
dn_callback : entries have identical CSN
syncrepl_entry: rid=004 be_search (0)
syncrepl_entry: rid=004 cn=M2client20@laposte.net,ou=clients,o=edf,c=fr
syncrepl_entry: rid=004 entry unchanged, ignored
syncrepl_entry: rid=004 LDAP_RES_SEARCH_ENTRY(LDAP_SYNC_ADD)
Can anyone explain to me why ? is this normal ?
The dn_callback message comes from the master log-file where
"cn=M2client20@laposte.net,ou=clients,o=edf,c=fr" was inserted.
Thanks in advance,