Hi helix84,
On 15/12/11 03:37, helix84 wrote:
> I tried to google for the error and found much about "Too many open
> files" in Tomcat and even DSpace, but this particular error "Exception
> unloading sessions to persistent storage" seems to be unique.
I didn't have your particular issue (I only just upgraded my repos to
1.7.2, maybe this is a 1.8 thing), but we've had to bump the ulimit up
-- /proc/sys/fs/file-max is reasonably high for us too, but the problem
was the limit of #files _per user_. ulimit -n should tell you what that
is, or on a RedHat system look at /etc/security/limits.conf.
ls -l /proc/${TOMCAT_PID}/fd/ | wc -l
shows you how many files are open by the tomcat process, where
TOMCAT_PID=`/usr/bin/jps | grep Bootstrap | cut -d ' ' -f 1`
(you'll probably need to run this as root).
We're logging #open files and tomcat sometimes has up to 3000 files --
our ulimit (RedHat default) originally was 1024.
#open files drops with each full garbage collection, and I suspect this
is somehow connected to the Cocoon sitemaps -- maybe it's
https://issues.apache.org/jira/browse/COCOON-1261 where they say that
this isn't a bug.
cheers,
Andrea
--
Dr Andrea Schweer
IRR Technical Specialist, ITS Information Systems
The University of Waikato, Hamilton, New Zealand
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