[OSM-dev] Renderd + expire_list

Samir Faci (Dev) dev at esamir.com
Wed Oct 20 14:51:39 BST 2010

I found the a previous version of the render_expired does work for me,
so it wasn't an issue in my setup as much as code changes.

Looking at git hub:

This commit broke my intended behavior.

as far as I can tell there are 3 modes of operation.

1.)   -d, --delete-from=ZOOM  when expiring tiles of ZOOM or higher,
delete them instead of re-rendering (default is off)
        (Which seems to delete the metal files affected)
2.)   -T, --touch-from=ZOOM   when expiring tiles of ZOOM or higher,
touch them instead of re-rendering (default is off)
        (Which seems to update the timestamp to be Jan 1 00:00 2000,
either ways a time in the past which would force a re-render on the
next view by the user).
3.)  The last condition checked is if doRender is true, it would
render, but the variable is never set to true, so the program always
just falls through, and never does anything.

     3b.  There is a condition that checks if minZoom < touchFrom or
minZoom < deleteFrom to enable the rendering flag.

I was going to submit a patch... but I wanted to understand the
intended purpose of these changes.

it seems like the program flow now is to only render in combination
with touchFrom or deleteFrom.

I'd like an option that simply given a list of tiles to re-render
them.  I presume that touch/delete has some advantages in regards with
rendering them on demand via apache's mod_tile.

Would adding an option such as --render-from=ZOOM be acceptable? that
simply takes the list of tiles and re-renders all the meta files in
the list?


cat expire.list| render_expired --render-from=10  -z 10 -Z 13

On Mon, Oct 18, 2010 at 10:10 AM, Samir Faci (Dev) <dev at esamir.com> wrote:
> I'm having some issues with the expire_list method.  I wanted to run
> this by everyone and see if there's anything I"m doing that's
> obviously wrong.
> I downloaded 48 hours of changes using osmosis which generated a
> changes.osc file.
> 1.) write the changes to the database.
> osm2pgsql -U osmuser  -H localhost -d gis   -e10 -o
> /tiles/sandbox/expire.list --append --slim  /OSMbin/osmosis/change.osc
> Everything looks good so far.
> 2.)  Now, at this point ideally, I'd like to just re-render the tiles
> in my expire.list.
> my usual command would be something like this:
> cat  /tiles/sandbox/expire.list  | render_expired  -v -all
> --socket=/var/run/renderd/renderd.sock   --min-zoom=10 --max-zoom=13
> which issues a lot of warnings about:  tile being "already requested"
> Looking at the output of renderd in the foreground shows me that no
> tiles are being rendered.
> I was following/reading the
> http://wiki.openstreetmap.org/wiki/Tile_expire_methods as a reference.
> as far as I can tell there are 2 options
> --touch-from (touch instead of render )   which I don't believe is
> what I want, but also complains about "already requested"
> --delete-from (delete instead of render) which is definitely not what I want..
> and the last option is the default behavior which is not working.
> I should be on svn r23377
> (git:f68f5dee3f50eaf12a6f7efbdcb9a6a9dda800b6 ) of mod_tile   , I can
> try to update to latest commit but it seems like it should be working.
> Any thoughts?
> --
> Samir Faci
> *insert title*
> fortune | cowsay -f /usr/share/cows/tux.cow

Samir Faci
*insert title*
fortune | cowsay -f /usr/share/cows/tux.cow

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