On 8/9/21 11:20 AM, Kees Bakker wrote:
On 09-08-2021 16:00, Mark Reynolds wrote:
On 8/9/21 8:09 AM, Kees Bakker wrote:
Hi,
When my dirsrv was trying to compact the databases I was getting this
error
[07/Aug/2021:23:59:02.715984489 +0200] - NOTICE - bdb_compact -
Compacting databases ...
[07/Aug/2021:23:59:02.765932397 +0200] - NOTICE - bdb_compact -
Compacting DB start: userRoot
[07/Aug/2021:23:59:03.518175414 +0200] - NOTICE - bdb_compact -
compactdb: compact userRoot - 417 pages freed
[07/Aug/2021:23:59:03.576427786 +0200] - NOTICE - bdb_compact -
Compacting DB start: ipaca
[07/Aug/2021:23:59:03.659941533 +0200] - NOTICE - bdb_compact -
compactdb: compact ipaca - 419 pages freed
[07/Aug/2021:23:59:03.718445310 +0200] - NOTICE - bdb_compact -
Compacting DB start: changelog
[08/Aug/2021:00:00:40.807571334 +0200] - NOTICE -
NSMMReplicationPlugin - changelog program - cl5CompactDBs - compacting
replication changelogs...
[08/Aug/2021:00:00:54.309357211 +0200] - ERR - libdb - BDB2055 Lock
table is out of available lock entries
[08/Aug/2021:00:00:54.726504736 +0200] - ERR - bdb_compact -
compactdb: failed to compact changelog; db error - 12 Cannot allocate
memory
[08/Aug/2021:00:00:54.801571421 +0200] - ERR - libdb - BDB2055 Lock
table is out of available lock entries
[08/Aug/2021:00:00:54.876618702 +0200] - ERR - NSMMReplicationPlugin -
changelog program - cl5CompactDBs - Failed to compact
a797bb0b-be1d11eb-88c0b677-613aa2ad; db error - 12 Cannot allocate
memory
[08/Aug/2021:00:00:57.253006449 +0200] - NOTICE - bdb_compact -
Compacting databases finished.
There are about 402k entries in cn=changelog.
I have a few questions
1) is it normal to have so many entries in cn=changelog? On another
replica I have almost 3M entries Isn't this cleaned up?
2) the number of locks is 50000 (there are two config items). Should I
increase that number? If so, increase to what?
3) is there maybe something else going on, causing the exhaustion of
the locks?
Ok, so by default there is no changelog trimming enabled. So the
changelog will grow without bounds, which is bad.
How much of this [1] applies? Indeed it says "By default the
Replication Changelog does not use any trimming by default."
So, how is the trimming actually enabled? I have these entries
dn: cn=changelog5,cn=config
cn: changelog5
nsslapd-changelogdir: /var/lib/dirsrv/slapd-EXAMPLE-COM/cldb
nsslapd-changelogmaxage: 30d
objectClass: top
objectClass: extensibleobject
So trimming is set, but it's set to 30 days (30d), that could/should be
shortened to "7d".
I recommend setting up the changelog max age to 7 days:
https://access.redhat.com/documentation/en-us/red_hat_directory_server/11/html/administration_guide/trimming_the_replication_changelog
Once that the trimming cleans up the changelog the database compaction
should work without issue. You can also increase the database locks to
1 million (that does require a restart of the server to take effect).
Let's hope that 1 million is enough :-)
It might not be, you can keep bumping it up if needed. There is no
limit, or negative impact on db performance.
Mark
HTH,
Mark
[1]
https://directory.fedoraproject.org/docs/389ds/FAQ/changelog-trimming.html
--
Directory Server Development Team
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