[Date Prev][Date Next]
Re: ContextCSN generation
I had the exact same problem, although my issues were tied closely to
the usage of the memberOf overlay, along with delta-sync replication.
The current Ubuntu LTS ( and Debian Wheezy) have OpenLDAP 2.4.28 which
helped quite a bit (also not using delta-sync replication anymore).
On Wed, Oct 10, 2012 at 11:52 AM, Sven Jourgensen <firstname.lastname@example.org> wrote:
> The version is 2.4.23, the config is the same across all the slaves,
> including the ones that stay in sync under load, the hardware itself is
> more than capable, I'm curious however to your clock comment, would an
> unstable clock on the slave cause the contextCSN token to be out of whack?
> Hence me asking rather how the contextCSN is generated and passed from
> master to slave, rather than, here's all my configs fix it for me.
> On Wed, 10 Oct 2012, Quanah Gibson-Mount wrote:
>> --On Wednesday, October 10, 2012 11:07 AM -0500 Sven Jourgensen
>> <email@example.com> wrote:
>> > I have an odd issue, where I have some new slaves that I added to my pool,
>> > they ran fine sync'ing with the master, etc. for weeks, until I added them
>> > into use (we're using an F5 frontend) whereupon they started getting a
>> > contextCSN which was larger than that of the master.
>> > How is the contextCSN generated, I thought the slave could never get ahead
>> > of the master, but it's happening consistently, it's not a transient
>> > thing, the slave gets a larger contextCSN and keeps it, until the master
>> > is updated again.
>> > master: contextCSN: 20121010154339.775633Z#000000#000#000000
>> > slave1: contextCSN: 20121010154442.858054Z#000000#000#000000
>> > slave2: contextCSN: 20121010154351.807575Z#000000#000#000000
>> > As soon as I remove them from use, and update the master, they come back
>> > into sync.
>> OpenLDAP version? Configs for master and replicas? Have you verified that
>> the clocks on all 3 servers are in sync?
>> Quanah Gibson-Mount
>> Sr. Member of Technical Staff
>> Zimbra, Inc
>> A Division of VMware, Inc.
>> Zimbra :: the leader in open source messaging and collaboration