[Zope] Zope Patch for Zeo Client Connection.py

[Paul Williams]

Hi Everyone,

We were experience problems with our zeo client setup on redhat rhel4. 
The client would just quit responding.  No memory or cpu increase was 
associated with this.  The client would remain hung until it was 
restarted.

We looked on the client using Netstat and the status was ESTABLISHED 
with the zeo server.  On the zeo server the netstat said LISTENING.

When running the deadlockdebugger, one thread was in asnycore wait.  The 
others were normal actions such as folder listing or folder contents.

We implemented a couple of lines of code on line 641 of connection.py in 
the ZEO/zrpc packages

We added and else clause to call self.close() if delay is over one 
second.  We found that one second wasn't quite enough and moved it to 5 
seconds.

Now we find out that this drastically improved our performance. The 
servers are now < 1 second per page load.  Before, they could be 5 
seconds or more, if they loaded at all.  Also, our servers used to crash 
several times a day and they now haven't crashed in almost a week.

I just wanted to put this out there and see if anyone has any comments 
at all.  I need to get a more permenant solution than this, but it is 
what we have for now.

Thank you,
Paul Williams