[ZODB-Dev] ZEO Client deadlocking in asyncore.poll - how to I debug

[Dieter Maurer]

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?



-- 
Dieter