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Re: Slapd sometimes stucks: slapd shutdown: waiting for N operations/tasks to finish

--On November 19, 2013 at 8:20:57 PM +0200 ÐÐÐÐÑÐÐÐÐÐÐ ÐÐÑÑÐÐ <casper@meteor.dp.ua> wrote:


In our 1 Master - several slaves environment master slapd sometimes
stucks in such condition that it takes minutes to get replay to simple
queries with no visible resource consumption on both: the slapd process
itself and the linux it is running on.

Restarting slapd helps for several days. Today I have not been able to
restart it without kill -9 because of:

slapd shutdown: waiting for 12 operations/tasks to finish

Waited 5 minutes with no luck, kill -9, start.

slapd: 2.4.28
OS: Ubuntu 12.04.2 LTS

I'm Ok with "try latest version", but it would be nice to have some
pointers (maybe bug in this version or error in configuration).

I would definitely say upgrade to 2.4.38. One thing that particularly stands out from the Changes file:

OpenLDAP 2.4.32 Release (2012/07/31)
       Fixed slapd-bdb/hdb cache hang under high load (ITS#7222)

Generally, I would suggest getting a full gdb backtrace and looking at the output of db_stat -C A and db_stat -c when it is in this state, if it occurs again after running a current release.


Quanah Gibson-Mount
Principal Software Engineer
Zimbra, Inc
Zimbra ::  the leader in open source messaging and collaboration