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Hello Christopher,<br>
<br>
Yes, it's way beyond my current skills. I had a shock when I found that
indentation really matters in the case of python!<br>
It would be nice if it is incorporated in the next release, thanks.<br>
<br>
Regards,<br>
Adrian<br>
<br>
Christopher Schmidt wrote:
<blockquote cite="mid:20091130123023.GA4421@metacarta.com" type="cite">
<pre wrap="">On Fri, Nov 27, 2009 at 11:10:34AM +0200, Adrian Popa wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hello everyone,
I finally got the time to fix this problem.
I just added a try/except block in Client.py to catch the
urllib2.HTTPError. It seems to work (for me), but I need to do further
tests, to make sure the tiles don't get skewed or something.
I would kindly ask one of the developers to have a look over the patch,
and if it's ok (it's just some error handling - it shouldn't screw
things up), it should be integrated in the next release of tilecache.
</pre>
</blockquote>
<pre wrap=""><!---->
Not as is, because it's not an option. Some people would prefer that
errors actually cause things to stop -- or at the very least, that errors
cause the user to receive some notification.
I realize that adding it as an option may be beyond your python skills,
since you mentioned you don't have much in the way of experience with the
language. I'll try to integrate this patch with an option to turn it on or
off in the next TileCache release.
The functionality of catching the exception seems fine, however.
-- Chris
</pre>
<blockquote type="cite">
<pre wrap="">Let me know if there is a procedure I should follow when submitting
patches/bug-fixes. (also, how to generate the patch).
In terms of output, when such an exception is encountered, it displays a
message, waits for 5 seconds and goes on (apparently urlib timesout
after ~65s):
07 (004624, 005229) = (2582960.0586 5542601.7932 2587852.0284
5547493.7630) [0.0003s : 2826.027/s] 9140/37195
07 (004625, 005229) = (2587852.0284 5542601.7932 2592743.9982
5547493.7630) [0.0003s : 2826.025/s] 9141/37195
07 (004626, 005229) = (2592743.9982 5542601.7932 2597635.9680
5547493.7630) [0.0003s : 2826.017/s] 9142/37195
### Oops - got a HTTP error while generating tile. This tile will be
skipped ###
07 (004627, 005229) = (2597635.9680 5542601.7932 2602527.9378
5547493.7630) [70.1914s : 281.353/s] 9143/37195
07 (004628, 005229) = (2602527.9378 5542601.7932 2607419.9076
5547493.7630) [0.0072s : 281.340/s] 9144/37195
07 (004629, 005229) = (2607419.9076 5542601.7932 2612311.8774
5547493.7630) [0.0050s : 281.334/s] 9145/37195
In this case, tile 9143 is skipped.
Regards,
Adrian
Adrian Popa wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Thanks for the help,
Unfortunately I am not a python programmer (perl is my thing), but I
will *try* to have a look in the source code, or try to catch the url
from apache (unfortunately the server is in production and has lots of
requests)...
Regards,
Adrian
Christopher Schmidt wrote:
</pre>
<blockquote type="cite">
<pre wrap="">On Mon, Oct 26, 2009 at 09:41:22AM +0200, Adrian Popa wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hello everyone,
I'm getting an error while trying to cache offline parts of my map.
The caching process runs fine until it hits a particular tile (my
guess is it's tile 9143) - when the process dies (after a timeout
of 2 minutes).
Here are samples of the output:
[root@terra utilities]# python
/var/www/html/tilecache/tilecache_seed.py rtc_base 1 10 --bbox
2255332.8831578,5336357.2739115,3306188.8761,6183726.4985628
...
07 (004621, 005229) = (2568284.1491 5542601.7932 2573176.1189
5547493.7630) [0.0003s : 2391.549/s] 9137/37195
File "/usr/lib/python2.4/urllib2.py", line 480, in http_error_default
raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
urllib2.HTTPError: HTTP Error 500: Internal Server Error
Here is what httpd error_log says:
[Mon Oct 26 09:23:13 2009] [warn] [client 127.0.0.1] Timeout
waiting for output from CGI script /var/www/cgi-bin/mapserv
[Mon Oct 26 09:23:13 2009] [error] [client 127.0.0.1] Premature end
of script headers: mapserv
[Mon Oct 26 09:25:13 2009] [warn] [client 127.0.0.1] Timeout
waiting for output from CGI script /var/www/cgi-bin/mapserv
If I try with the --reverse parameter, the same thing happens after
a while, but at a different tile.
I have two questions:
1. Can I convince tilecache to skip the tiles it can't render,
instead of dying?
</pre>
</blockquote>
<pre wrap="">Not build in, but you can certainly modify the client to catch errors
and keep going.
</pre>
<blockquote type="cite">
<pre wrap="">2. What would be the necessary steps I need to take to troubleshoot
this problem? (I am generating this cache from a mapserver which is
getting its data from shapefiles).
</pre>
</blockquote>
<pre wrap="">Look in the apache logs for the mapserver, look at what the URL is,
and send it to the mapserver. See if it fails in the same way. If so,
it's a mapserver 'issue' (quotes because it may simply be taking too
long to do
this tile, and the actual issue is that you need to bump up your apache
timeout), and can be treated externally to TileCache.
-- Chris
</pre>
<blockquote type="cite">
<pre wrap="">Thanks,
Adrian
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</pre>
</blockquote>
<pre wrap="">
</pre>
</blockquote>
<pre wrap="">------------------------------------------------------------------------
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</pre>
</blockquote>
<pre wrap="">
--
--- Adrian Popa
NOC Division
Network Engineer
Divizia Centrul National de Operare Retea
Departament Transport IP & Metro
Compartiment IP Core & Backbone
Phone: +40 21 400 3099
</pre>
</blockquote>
<pre wrap=""><!---->
</pre>
<blockquote type="cite">
<pre wrap="">diff -rau TileCache-2.10-py2.4.egg.orig/TileCache/Client.py TileCache-2.10-py2.4.egg/TileCache/Client.py
--- TileCache-2.10-py2.4.egg.orig/TileCache/Client.py 2009-10-12 09:29:19.000000000 +0300
+++ TileCache-2.10-py2.4.egg/TileCache/Client.py 2009-11-27 10:58:11.000000000 +0200
@@ -114,7 +114,11 @@
tileStart = time.time()
tile = Tile(layer,x,y,z)
bounds = tile.bounds()
- svc.renderTile(tile,force=force)
+ try:
+ svc.renderTile(tile,force=force)
+ except urllib2.HTTPError:
+ print "### Oops - got a HTTP error while generating tile. This tile will be skipped ###"
+ time.sleep(5)
total += 1
zcount += 1
box = "(%.4f %.4f %.4f %.4f)" % bounds
</pre>
</blockquote>
<pre wrap=""><!---->
</pre>
</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
---
Adrian Popa
NOC Division
Network Engineer
Divizia Centrul National de Operare Retea
Departament Transport IP & Metro
Compartiment IP Core & Backbone
Phone: +40 21 400 3099
</pre>
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