Hello,

Bad Guy badguy9588@hotmail.com writes:

Dear all,

I am running the openldap 2.4.11 with 4 way masters (SID=001 to

4. configured. (my suffix is empty in slapd.conf)

The data can be synced initially.  I add records in 1 server and

all the other 3 servers will have the new record added. However, I found that after running for some time, one server will have corrupted contextCSN in SID=001.

dn:
contextCSN::

sCttCIio0wAxNTQzMTMuMDQ1Mjk3WiMwMDAwMDAjMDAyIzAwMDAwMA== contextCSN: 20081107061013.853051Z#000000#001#000000 contextCSN: 20081107073602.911356Z#000000#003#000000 contextCSN: 20081107061028.825773Z#000000#004#000000

The contextCSN for SID=002 in server 1 is corrupted.  So, whenever

there is an update in SID=002 server, the SID=001 server will never get the update, however, when there is update in SID=003 or SID=004 server, the records will get updated in SID=001.

We have a background cron job in each server running!

at 1 minutes interval to retrieve the records and set some user defined attributes if it meet some certain criteria.

What's the cause to this corruption ?  Is there any way to recover

the corrupted contextCSN by command or script without rebuild the data

In fact it is base64 encoded

dieter@magenta:~> mmencode -u sCttCIio0wAxNTQzMTMuMDQ1Mjk3WiMwMDAwMDAjMDAyIzAwMDAwMA== �+���154313.045297Z#000000#002#000000

-Dieter

config as follow :

Server 1 :

syncrepl rid=001 provider=ldap://host1:389/ bindmethod=simple binddn="cn=Manager" credentials=secret searchbase="o=ABC" schemachecking=off type=refreshAndPersist attrs="*,+" retry="1 +"

syncrepl rid=002 provider=ldap://host2:389/ bindmethod=simple binddn="cn=Manager" credentials=secret searchbase="o=ABC" schemachecking=off type=refreshAndPersist attrs="*,+" retry="1 +"

syncrepl rid=003 provider=ldap://host3:389/ bindmethod=simple binddn="cn=Manager" credentials=secret searchbase="o=ABC" schemachecking=off type=refreshAndPersist attrs="*,+" retry="1 +"

syncrepl rid=004 provider=ldap://host4:389/ bindmethod=simple binddn="cn=Manager" credentials=secret searchbase="o=ABC" schemachecking=off type=refreshAndPersist attrs="*,+" retry="1 +"

mirrormode on serverID 001

# Performance tuning directives sizelimit 5000 threads 8 idletimeout 14400 cachesize 10000 checkpoint 256 15

for server 2, server 3, server 4, config are the same as server 1, except the serverID is different (serverID 002, serverID 003, serverID 004 respectively).

My question is, for each server, the config for syncrepl should exclude itself ?

i.e. for server 1, no need to include these lines ?? similar for server 2, 3, 4 ???

syncrepl rid=001

provider=ldap://host1:389/

bindmethod=simple

binddn="cn=Manager"

credentials=secret

searchbase="o=ABC"

schemachecking=off

type=refreshAndPersist

attrs="*,+"

retry="1 +"

Thanks

Date: Tue, 11 Nov 2008 12:16:39 +0100 From: ando@sys-net.it To: badguy9588@hotmail.com CC: openldap-technical@openldap.org Subject: Re:

Bad Guy wrote:

...

Dear all,

I am running the openldap 2.4.11 with 4 way masters  (SID=001 to 004) configured.  (my suffix is empty in slapd.conf)

The data can be synced initially.  I add records in 1 server and all the other 3 servers will have the new record added.  However, I found that after running for some time, one server will have corrupted contextCSN in SID=001.  

dn:
contextCSN:: sCttCIio0wAxNTQzMTMuMDQ1Mjk3WiMwMDAwMDAjMDAyIzAwMDAwMA==
contextCSN: 20081107061013.853051Z#000000#001#000000
contextCSN: 20081107073602.911356Z#000000#003#000000
contextCSN: 20081107061028.825773Z#000000#004#000000

The contextCSN for SID=002 in server 1 is corrupted.  So, whenever there is an update in SID=002 server, the SID=001 server will never get the update,
however, when there is update in SID=003 or SID=004 server, the records will get updated in SID=001.

We have a background cron job in each server running at 1 minutes interval to retrieve the records and set some user defined attributes if it meet some certain criteria.

What's the cause to this corruption ?  Is there any way to recover the corrupted contextCSN by command or script without rebuild the data ?

Looks similar to http://www.openldap.org/its?findid=5661. Can you post your configuration? Also, can you try re24 code from the CVS (or wait until 2.4.13 is out)?

p.

Ing. Pierangelo Masarati OpenLDAP Core Team

SysNet s.r.l. via Dossi, 8 - 27100 Pavia - ITALIA http://www.sys-net.it

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Office: +39 02 23998309 Mobile: +39 333 4963172 Fax: +39 0382 476497 Email: ando@sys-net.it

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