[Tilecache] Getting frequent 500 Internal Server Error

Tue Sep 9 10:50:49 EDT 2008

My error.log is full of the following messages, however, it does not 
seem to be causing a problem.
[Tue Sep 09 10:21:42 2008] [warn] mod_python (pid=8100, 
interpreter='open-103f539208.localdomain'): Module imports an ancestor 
module. This may cause problems. Please check code. File doing import is 
"C:\\Program Files\\Apache Software 
Foundation\\Apache2.2\\htdocs\\tilecache-1.9\\TileCache\\Layer.py".
[Tue Jul 01 14:52:16 2008] [notice] mod_python (pid=2960, 
interpreter='open-103f539208.localdomain'): Reimporting module 
'C:\\Program Files\\Apache Software 
Foundation\\Apache2.2\\htdocs\\tilecache-1.9\\TileCache\\Service.py'
[Tue Jul 01 14:52:16 2008] [notice] mod_python (pid=2960, 
interpreter='open-103f539208.localdomain'): Reimporting module 
'C:\\Program Files\\Apache Software 
Foundation\\Apache2.2\\htdocs\\tilecache-1.9\\TileCache\\Layer.py'

However, I do also see a number of errors that look suspicious:
[Sat Sep 06 21:58:23 2008] [error] [client xxx.xxx.xxx.xxx] mod_python 
(pid=8100, interpreter='open-103f539208.localdomain', 
phase='PythonHandler', handler='TileCache/Service'): Application error
[Sat Sep 06 21:58:23 2008] [error] [client xxx.xxx.xxx.xxx] ServerName: 
'open-103f539208.localdomain'
[Sat Sep 06 21:58:23 2008] [error] [client xxx.xxx.xxx.xxx] 
DocumentRoot: 'C:/Program Files/Apache Software Foundation/Apache2.2/htdocs'
[Sat Sep 06 21:58:23 2008] [error] [client xxx.xxx.xxx.xxx] URI: 
'/tilecache/tilecache.py'
[Sat Sep 06 21:58:23 2008] [error] [client xxx.xxx.xxx.xxx] Location: None
[Sat Sep 06 21:58:23 2008] [error] [client xxx.xxx.xxx.xxx] Directory: 
'C:/Program Files/Apache Software 
Foundation/Apache2.2/htdocs/tilecache-1.9/'
[Sat Sep 06 21:58:23 2008] [error] [client xxx.xxx.xxx.xxx] Filename: 
'C:/Program Files/Apache Software 
Foundation/Apache2.2/htdocs/tilecache-1.9/tilecache.py'
[Sat Sep 06 21:58:23 2008] [error] [client xxx.xxx.xxx.xxx] PathInfo: ''
[Sat Sep 06 21:58:23 2008] [error] [client xxx.xxx.xxx.xxx] Traceback 
(most recent call last):
[Sat Sep 06 21:58:23 2008] [error] [client xxx.xxx.xxx.xxx]   File 
"C:\\Python25\\lib\\site-packages\\mod_python\\importer.py", line 1537, 
in HandlerDispatch\n    default=default_handler, arg=req, 
silent=hlist.silent)
[Sat Sep 06 21:58:23 2008] [error] [client xxx.xxx.xxx.xxx]   File 
"C:\\Python25\\lib\\site-packages\\mod_python\\importer.py", line 1229, 
in _process_target\n    result = _execute_target(config, req, object, arg)
[Sat Sep 06 21:58:23 2008] [error] [client xxx.xxx.xxx.xxx]   File 
"C:\\Python25\\lib\\site-packages\\mod_python\\importer.py", line 1128, 
in _execute_target\n    result = object(arg)
[Sat Sep 06 21:58:23 2008] [error] [client xxx.xxx.xxx.xxx]   File 
"C:\\Program Files\\Apache Software 
Foundation\\Apache2.2\\htdocs\\tilecache-1.9\\TileCache\\Service.py", 
line 553, in handler\n    return modPythonHandler(apacheReq, theService)
[Sat Sep 06 21:58:23 2008] [error] [client xxx.xxx.xxx.xxx]   File 
"C:\\Program Files\\Apache Software 
Foundation\\Apache2.2\\htdocs\\tilecache-1.9\\TileCache\\Service.py", 
line 474, in modPythonHandler\n    
"".join(traceback.format_tb(sys.exc_traceback))))
[Sat Sep 06 21:58:23 2008] [error] [client xxx.xxx.xxx.xxx] 
AttributeError: 'module' object has no attribute 'exc_traceback'

And some errors that report "missing" files:
[Sat Sep 06 03:11:00 2008] [error] [client xxx.xxx.xxx.xxx] File does 
not exist: C:/Program Files/Apache Software 
Foundation/Apache2.2/htdocs/azenv2.php
[Sun Sep 07 23:56:59 2008] [error] [client xxx.xxx.xxx.xxx] File does 
not exist: C:/Program Files/Apache Software 
Foundation/Apache2.2/htdocs/myproxies
[Mon Sep 08 04:58:14 2008] [error] [client xxx.xxx.xxx.xxx] File does 
not exist: C:/Program Files/Apache Software 
Foundation/Apache2.2/htdocs/myproxies
[Mon Sep 08 08:22:05 2008] [error] [client xxx.xxx.xxx.xxx] File does 
not exist: C:/Program Files/Apache Software 
Foundation/Apache2.2/htdocs/vhcs2

and finally, and interesting warning:
[Tue Sep 02 09:19:45 2008] [warn] (OS 64)The specified network name is 
no longer available.  : winnt_accept: Asynchronous AcceptEx failed.

Any thoughts? Thanks, David

Fredrik Lundh wrote:
>> We have multiple client hitting the tile server where all tiles have
>> been previously generated and cached. We are seeing frequent "500
>> Internal Server Errors" returned from the tile cache, however, when
>> requested a second time, the tile returns normally. Here is the
>> transaction as reported by LiveHTTPHeaders,
>>     
>
> have you checked the Apache log files?  more information about
> internal server errors are usually logged to the "error.log" file.
>
> </F>
>   

-- 

David R Robison
Open Roads Consulting, Inc.
708 S. Battlefield Blvd., Chesapeake, VA 23322
phone: (757) 546-3401
e-mail: drrobison at openroadsconsulting.com
web: http://openroadsconsulting.com
blog: http://therobe.blogspot.com
book: http://www.xulonpress.com/book_detail.php?id=2579

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