Zope 2.9.0
We are seeing spontaneous restarts of Zope with no indication in any of
the standard Zope logs. Looking at the ZEO log indicates that the
restarts of Zope are due to a lost connection between Zope & ZEO but
with no other information. The logging level is set at the distribution
default (INFO).
The restarts are a huge problem because session variables are not
persistent and so all of the user state they contain is lost on restart.
In our statful implementation, this is a major problem. I want to adjust
the configuration so that the Zope/ZEO connection is stable.
In our configuration, Zope and ZEO are linked via localhost on a
distinguished port.
I've Googled about looking for some infomation about tuning the ZEO/Zope
interface, but have found little real information. Some additional log
detail would be helpful.
We are running a fairly vanilla setup, excerpted below:
<<zope.conf>>
# ZEO client storage:
#
<zodb_db main>
mount-point /
# ZODB cache, in number of objects
cache-size 5000
<zeoclient>
server localhost:8301
storage 1
var $INSTANCE/var
# ZEO client cache, in bytes
cache-size 20MB
# Uncomment to have a persistent disk cache
client group1-zeo
</zeoclient>
</zodb_db>
<<zeo.conf>>
<zeo>
address localhost:8301
read-only false
invalidation-queue-size 100
pid-filename $INSTANCE/var/ZEO.pid
# monitor-address PORT
# transaction-timeout SECONDS
</zeo>
<runner>
program $INSTANCE/bin/runzeo
socket-name $INSTANCE/etc/zeo.zdsock
daemon true
forever false
backoff-limit 10
exit-codes 0, 2
directory $INSTANCE
default-to-interactive true
# user zope
python /usr/bin/python2.4
zdrun /usr/local/src/zope/Zope2.9/lib64/python/zdaemon/zdrun.py
# This logfile should match the one in the zeo.conf file.
# It is used by zdctl's logtail command, zdrun/zdctl doesn't write it.
logfile $INSTANCE/log/zeo.log
</runner>
It's not clear what changes will lead to a more stable connection because
it is not clear what's triggering the problem. Any advice would be
appreciated.
Presumably the shotgun approach would work -- increase the cache sizes,
lengthen the invalidation-queue-size, and increase the backoff-limit but
it would be nice to have some guidance.
5~
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