On 06/19/2015 03:25 PM, Rich Megginson wrote:
On 06/19/2015 04:29 AM, Ivanov Andrey (M.) wrote:
> Hi Noriko,
>
> ------------------------------------------------------------------------
>
>
> There are three MMR replicating servers. It's one month of
> uptime and the servers wanted to trim the replication log.
> Here is what i've found in error log on each of them :
>
> 1st server:
> [18/Jun/2015:08:04:31 +0200] - libdb: BDB2055 Lock table is
> out of available lock entries
>
> May not matter, but could you please try increasing the value of
> this db config parameter? The default value is 10000.
>
> dn: cn=config,cn=ldbm database,cn=plugins,cn=config
> nsslapd-db-locks: 10000
>
> Ok. I've increased nsslapd-db-locks to 20000 and reduced
> nsslapd-changelogcompactdb-interval to 3600 in
> cn=changelog5,cn=config to see the changelog free event more
> frequently. No change. I have still :
>
> [19/Jun/2015:10:36:46 +0200] - libdb: BDB2055 Lock table is out of
> available lock entries
> [19/Jun/2015:10:36:46 +0200] NSMMReplicationPlugin - changelog
> program - _cl5CompactDBs: failed to compact
> a45fa684-f28d11e4-af27aa63-5121b7ef; db error - 12 Cannot allocate memory
>
>
>
> [18/Jun/2015:08:04:31 +0200] NSMMReplicationPlugin -
> changelog program - _cl5CompactDBs: failed to compact
> a45fa684-f28d11e4-af27aa63-5121b7ef; db error - 12 Cannot
> allocate memory
>
> I don't thing there is any problem even if the DBs are not
> compacted. It was introduced just to release the free pages in
> the db files. But I'd also like to learn why the compact fails
> with ENOMEM here.
>
> Ok, thanks.
I'm guessing that bdb returns ENOMEM when it runs out of locks.
I think the only remedy is to just keep increasing the number of locks
until this error goes away. I don't know how to estimate how many
locks are required ahead of time.
I think compact can be consuming many locks,
maybe for each of the pages
in the cldb, and then there is this bug:
https://fedorahosted.org/389/ticket/47934
did you verify that your changes have been effective ? try the db_stat:
db_stat -c -h /var/lib/dirsrv/slapd-<INSTANCE>/db/ | grep locks
>
>
>
>
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