[Date Prev][Date Next] [Chronological] [Thread] [Top]

Re: N-Way Multimaster with syncrepl and delta-repl -- slapd stops responding

On 02/21/2013 01:19 PM, Quanah Gibson-Mount wrote:

--On Thursday, February 21, 2013 9:27 AM -0800 Quanah Gibson-Mount
<quanah@zimbra.com> wrote:


--On Thursday, February 21, 2013 8:35 AM -0500 "Robert W. Smith"
<bob.smith@o3bnetworks.com> wrote:


Hi,

I am running a 4-way multi-master configuration with a number of slaves
in remote locations. I am currently running openldap 2.4.33 on top of
CentOS 6.3 (I built 2.4.33 from a modified base centos 6 spec file). I
was originally running the centos base openldap 2.4.23 using N-way
multimaster using the syncrepl configuration but I was having problems
with the masters and slaves staying in perfect sync--other than this
2.4.23 was running stably since last spring. I'll try to be brief in what
has happened since Feb 1.

Did you build openldap with debugging symbols? (-g)
Did you disable optimization? (-O0)

If so, I would advise submitting an ITS, with a full backtrace from gdb:

<http://www.openldap.org/faq/data/cache/59.html>

Oh, also make sure when make install is run, you don't strip the binaries
of the debug symbols (make install STRIP="")

I would also warn against using the centos spec file, as it links to NSS
instead of OpenSSL.  You probably want to look at
<http://ltb-project.org/wiki/download#openldap>

--Quanah

--

Quanah Gibson-Mount
Sr. Member of Technical Staff
Zimbra, Inc
A Division of VMware, Inc.
--------------------
Zimbra ::  the leader in open source messaging and collaboration

Quanah,
I re-compiled 2.4.33 using the openssl libraries on Friday and have installed the updated packages on my four master servers. I have not experienced a single deadlock since then. The slaves have not been upgraded yet--they are still running the centos stock 2.4.23 distribution.
The only issue that I still have is one or more threads running at full throttle and utilizing 100% CPU. But this is a different issue and I'll start a new thread on this when I get a chance to look at this more. 

Thanks,
Bob
--bs