[Date Prev][Date Next]
[Chronological]
[Thread]
[Top]
Re: Replication delay
--On Thursday, March 21, 2019 9:22 AM +0100 "Ángel L. Mateo"
<amateo@um.es> wrote:
I've been running MMR (not delta) for years too without problems too.
Now the server with problems works without problems for days, but then
it start delaying syncs.
The problem I have is that I don't know how to debug it.
Is there any documentation about how to debug it? about the sync logs
messages?
I think one of the key differences to understand between syncrepl and
delta-syncrepl is that syncrepl will simply overwrite entries that have
discrepencies while delta-syncrepl will go into REFRESH mode. Since you
started out with an OpenLDAP version that has numerous replication bugs, it
may be your masters are not in accordance with one another, and the
"delays" you are seeing are actually systems going into refresh.
The first thing you should look at is if there are any instances of REFRESH
in your logs, something along the lines of:
do_syncrep2: rid=001 delta-sync lost sync, switching to REFRESH
If you see that, the issue isn't delayed replication, the issue is that
your databases are out of sync.
If you don't see instances of REFRESH mode being triggered in your log, we
can discuss further what the logs indicate and other things that may need
looking at.
--Quanah
--
Quanah Gibson-Mount
Product Architect
Symas Corporation
Packaged, certified, and supported LDAP solutions powered by OpenLDAP:
<http://www.symas.com>