Correction: intermittent 502 error also happens with Apache fronting CherryPy, although much rarer (1 out of 20000 requests).
I have lost confidence in mod_proxy_http, and will go forward with Apache + mod_proxy_ajp + flup#ajp, which I think is a decent and underrated combo. On Wednesday, August 8, 2012 7:07:43 AM UTC+8, Yap Sok Ann wrote: > > I have Apache configuration like this: > > <Proxy balancer://production> > BalancerMember http://127.0.0.1:6543 > BalancerMember http://127.0.0.1:6544 > </Proxy> > > ProxyPass / balancer://production/ > ProxyPassReverse / balancer://production/ > > Ports 6543 and 6544 are pserve processes using Waitress. > > From time to time, requests to pages will fail with 502 error (roughly 1 > out of 3000 requests). When that happens, there will be logs like this from > Waitress: > > 2012-08-07 18:06:28,607 ERROR [waitress][Dummy-3] Exception when serving > /cases/new > Traceback (most recent call last): > File > "c:\virtualenv\production\lib\site-packages\waitress-0.8.1-py2.7.egg\waitress\channel.py", > > line 329, in service > task.service() > File > "c:\virtualenv\production\lib\site-packages\waitress-0.8.1-py2.7.egg\waitress\task.py", > > line 173, in service > self.execute() > File > "c:\virtualenv\production\lib\site-packages\waitress-0.8.1-py2.7.egg\waitress\task.py", > > line 412, in execute > self.write(chunk) > File > "c:\virtualenv\production\lib\site-packages\waitress-0.8.1-py2.7.egg\waitress\task.py", > > line 285, in write > channel.write_soon(rh) > File > "c:\virtualenv\production\lib\site-packages\waitress-0.8.1-py2.7.egg\waitress\channel.py", > > line 311, in write_soon > self.outbufs[-1].append(data) > File > "c:\virtualenv\production\lib\site-packages\waitress-0.8.1-py2.7.egg\waitress\buffers.py", > > line 246, in append > buf.append(s) > File > "c:\virtualenv\production\lib\site-packages\waitress-0.8.1-py2.7.egg\waitress\buffers.py", > > line 54, in append > read_pos = file.tell() > ValueError: I/O operation on closed file. > 2012-08-07 18:06:28,608 ERROR [waitress][Dummy-3] Exception when servicing > <waitress.channel.HTTPChannel 127.0.0.1:61326 at 0x7883198> > Traceback (most recent call last): > File > "c:\virtualenv\production\lib\site-packages\waitress-0.8.1-py2.7.egg\waitress\task.py", > > line 76, in handler_thread > task.service() > File > "c:\virtualenv\production\lib\site-packages\waitress-0.8.1-py2.7.egg\waitress\channel.py", > > line 342, in service > task.service() # must not fail > File > "c:\virtualenv\production\lib\site-packages\waitress-0.8.1-py2.7.egg\waitress\task.py", > > line 173, in service > self.execute() > File > "c:\virtualenv\production\lib\site-packages\waitress-0.8.1-py2.7.egg\waitress\task.py", > > line 320, in execute > self.write(tobytes(body)) > File > "c:\virtualenv\production\lib\site-packages\waitress-0.8.1-py2.7.egg\waitress\task.py", > > line 285, in write > channel.write_soon(rh) > File > "c:\virtualenv\production\lib\site-packages\waitress-0.8.1-py2.7.egg\waitress\channel.py", > > line 311, in write_soon > self.outbufs[-1].append(data) > File > "c:\virtualenv\production\lib\site-packages\waitress-0.8.1-py2.7.egg\waitress\buffers.py", > > line 246, in append > buf.append(s) > File > "c:\virtualenv\production\lib\site-packages\waitress-0.8.1-py2.7.egg\waitress\buffers.py", > > line 54, in append > read_pos = file.tell() > ValueError: I/O operation on closed file. > > We didn't encounter this error with Apache fronting CherryPy. It only > started happening after switching to Waitress. > -- You received this message because you are subscribed to the Google Groups "pylons-discuss" group. To view this discussion on the web visit https://groups.google.com/d/msg/pylons-discuss/-/lS-28uuh1VMJ. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/pylons-discuss?hl=en.
