[Tilecache] Problem moving tilecache from Ubuntu 12.04 to 14.04

Gery . gamejihou at hotmail.com
Thu Jul 9 09:48:45 PDT 2015


That's pretty cool Steve, it would be neat to know more about your progress with mapcache.
Gery

> To: tilecache at lists.osgeo.org
> From: woodbri at swoodbridge.com
> Date: Thu, 9 Jul 2015 11:31:53 -0400
> Subject: Re: [Tilecache] Problem moving tilecache from Ubuntu 12.04 to 14.04
> 
> After two days of trying to fix this problem and not making any headway, 
> I gave up and converted the project over to mapcache which was pretty 
> easy and straight forward. The whole conversion took about 1 hr to 
> create the mapcache.xml file equivalent to the tilecache.cfg and to edit 
> the html to point to mapcache and enable it in apache. This used the 
> existing cache so I didn't need to repopulate it.
> 
> -Steve
> 
> On 7/7/2015 3:21 PM, Stephen Woodbridge wrote:
> > Hi All,
> >
> > I'm having a problem upgrading a system with tilecache installed on it.
> > After two days and no headway, I probably am missing some basic or I've
> > hit a real problem.
> >
> > The Problem:
> >
> > On the 14.04 server:
> >
> > http://74.208.113.181/tilecache-2.01/tilecache.py?LAYERS=bathy_contours&FORMAT=image%2Fpng&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&SRS=EPSG%3A4326&BBOX=-73.4,29.6,-71.8,31.2&WIDTH=256&HEIGHT=256
> >
> >
> > Errors out with:
> > An error occurred: Current x value -73.400000 is too far from tile
> > corner x -75.000000
> >
> > but with the same url on the 12.04 server I get an image:
> >
> > http://74.208.78.238/tilecache-2.01/tilecache.py?LAYERS=bathy_contours&FORMAT=image%2Fpng&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&SRS=EPSG%3A4326&BBOX=-73.4,29.6,-71.8,31.2&WIDTH=256&HEIGHT=256
> >
> >
> > some tiles are returned correctly and some are not. Here is one that works:
> >
> > http://74.208.113.181/tilecache-2.01/tilecache.py?LAYERS=bathy_model&FORMAT=image%2Fpng&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&SRS=EPSG%3A4326&BBOX=-76.6,36,-75,37.6&WIDTH=256&HEIGHT=256
> >
> >
> > http://74.208.78.238/tilecache-2.01/tilecache.py?LAYERS=bathy_model&FORMAT=image%2Fpng&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&SRS=EPSG%3A4326&BBOX=-76.6,36,-75,37.6&WIDTH=256&HEIGHT=256
> >
> >
> > Situation:
> >
> > Ubuntu 12.04 LTS server running:
> > tilecache/precise uptodate 2.11-2
> > apache2/precise-security 2.2.22-1ubuntu1.8
> > python/precise-updates uptodate 2.7.3-0ubuntu2.2
> >
> > and in the apache sites-enabled:
> >          Alias /tilecache-2.01 /var/lib/python-support/python2.7/
> >          <Directory /var/lib/python-support/python2.7/>
> >                  SetHandler python-program
> >                  PythonHandler TileCache.Service
> >                  PythonOption TileCacheConfig /etc/tilecache.cfg
> >          </Directory>
> >
> >
> > I setup a new server and rsync the tilecache, the /etc/tilecache.cfg and
> > set it up using:
> > tilecache:all/trusty 2.11-2 uptodate
> > apache2:amd64/trusty-security 2.4.7-1ubuntu4.4 uptodate
> > python:amd64/trusty 2.7.5-5ubuntu3 uptodate
> > python2.7:amd64/trusty-security 2.7.6-8ubuntu0.2 uptodate
> > python3:amd64/trusty 3.4.0-0ubuntu2 uptodate
> > python3.4:amd64/trusty-security 3.4.0-2ubuntu1.1 uptodate
> >
> > # python --version
> > Python 2.7.6
> >
> > and in the apache sites-enabled:
> >          Alias /tilecache-2.01 /var/lib/python-support/python2.7/
> >          <Directory /var/lib/python-support/python2.7/>
> >                  #SetHandler python-program
> >                  AddHandler python-program .py
> >                  PythonHandler TileCache.Service
> >                  PythonOption TileCacheConfig /etc/tilecache.cfg
> >                  Require all granted
> >          </Directory>
> >
> > The cache should be fully populated so there should be not need to hit
> > mapserver but I occasionally get mapserver processes running at 100% for
> > long periods of time, probably because the cache thinks it needs to
> > generate a metatile. I probably will need to check mapfiles because the
> > old server is running MapServer version 6.2.1 and the new server is on
> > MapServer version 6.4.1
> >
> > Problem Analysis:
> >
> > This is probably faulty or incomplete as it has not lead me to a solution.
> >
> > 1. tilecache is configured and running
> > 2. different versions of apache 2.2 vs 2.4
> >     - had to make changes in handler above
> >     - are there other changes like environment variables or initialization
> > 3. system has both python 2.7 and 3.0 installed is something strange
> > happening because of this?
> > 4. are the differences in mod_python between the two systems that might
> > cause this?
> > 5. there appears to be a pattern to what tiles are ok or broken but its
> > not clear what it means. Maybe some kind of rounding issue?
> > 6. I diff'd the files in /var/lib/python-support/python2.7/ tree and
> > they are all the same except a few of the pyc files. I recompiled them
> > on the new system just be be sure with python -m py_compile
> > /path/to/file.py but that did not change anything.
> >
> > I looked at the Layer.py code and it is failing in getCell() at:
> >
> >          if exact:
> >              if (abs(minx - tilex)  / res > 1):
> >                  raise TileCacheException("Current x value %f is too far
> > from tile corner x %f" % (minx, tilex))
> >
> > because abs(minx - tilex) / res = 256 which seems curious as this is the
> > size of a tile. So I'm thinking that this code might be behaving badly:
> >
> >      def getResolution (self, (minx, miny, maxx, maxy)):
> >          """
> >          >>> l = Layer("name")
> >          >>> l.getResolution((-180,-90,0,90))
> >          0.703125
> >          """
> >          return max( float(maxx - minx) / self.size[0],
> >                      float(maxy - miny) / self.size[1] )
> >
> > I'm getting res=0.00625 for the broken request.
> >
> > So the bottom line, I'm totally lost in this issue and probably looking
> > in all the wrong places.
> >
> > -Steve
> > _______________________________________________
> > Tilecache mailing list
> > Tilecache at lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/tilecache
> 
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