Last month I ask for help about hanging zeo clients. I promised to
follow up.
Dieter Maurer wrote:
Anton Stonor wrote at 2008-4-7 16:16 +0200:
We have a setup with a ZEO server and 4 ZEO clients.
During the last weeks we have seen almost daily deadlocks in some of the
ZEO clients. I've tried to wait for up to 30 minutes before restarting a
client.
I could need an advice on how to debug this.
With DeadlockDebugger I see the same pattern each time:
One thread is hanging:
...
r_flags, r_args = self.wait(msgid)
File "/usr/local/www/zope-2.9.6/lib/python/ZEO/zrpc/connection.py",
line 638, in wait
This means that the client is waiting for a reply -- which apparently
does not come.
Maybe some router or firewall sometimes drops packages and connections?
It was a hardware issue. /var/log/messages was full of random "link
state changed to DOWN". The unstable net connection was caused by a
unstable switch.
/Anton
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