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.
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