Re: [OSM-talk] Map tiles in Chrome
On 23/10/2011 20:03, Kai Krueger wrote: David Earl wrote: So what's going on? If the cache is empty, is the server really serving an old tile? Is there some proxying going on somewhere (there's no explicit proxies)? Why is it random which tiles update? Yes, there is a server side proxy in-between the tileserver to reduce load on the main timeserver ... Ah, thanks for that explanation. That explains why pretty much nothing I do has any effect. David ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Map tiles in Chrome
David Earl wrote: So what's going on? If the cache is empty, is the server really serving an old tile? Is there some proxying going on somewhere (there's no explicit proxies)? Why is it random which tiles update? Yes, there is a server side proxy in-between the tileserver to reduce load on the main timeserver and it can have these slightly odd updating behaviors. As the proxy servers don't use an explicit expiry mechanism for when the rendering server has rendered a new tile, it can serve old tiles if it was caching them before the rendering. Which tiles update depend on when they were last viewed by anyone, which proxy it goes through, when the tile was previously rendered and if the tile is still in cache. mod_tile uses a combination of etag-headers based on the md5 of a tile and on expiry-headers with a prediction of how long mod_tile guesses the tile might not be updated for and thus can be considered fresh by a proxy without rechecking for modifications. Kai -- View this message in context: http://gis.638310.n2.nabble.com/Map-tiles-in-Chrome-tp6917001p6922674.html Sent from the General Discussion mailing list archive at Nabble.com. ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Map tiles in Chrome
I get this problem too, seems to stick completely even over a day or two until I clear the relevant cached data. Then it seems to be ok for me. As you say, seems to be a bigger issue at higher zoom. Cheers Andy -Original Message- From: David Earl [mailto:da...@frankieandshadow.com] Sent: 21 October 2011 14:58 To: osm Subject: [OSM-talk] Map tiles in Chrome I'm very puzzled by Chrome's behaviour with respect to the main Mapnik map tiles. When I'm working on an area, it is very common for a tile not to visibly update after refreshing after uploading some changes. Some do, some don't, especially at high zoom levels When I do a status on the tile, it is clear it has been re-rendered. It's not that it is stuck in a rendering queue - the renderer has finished. If I clear the Chrome cache, it still doesn't drop the old rendering. If I drop the Chrome cache and restart Chrome it still doesn't let go. The only way I have found that is certain to display the new tile is: 1. Right Click on the tile in the home page and choose 'Show image in now tab' 2. Go to the new tab, and hard refresh (CTRL+F5) 3. Restart chrome (a hard refresh or a click on Permalink after step 2 isn't sufficient). So what's going on? If the cache is empty, is the server really serving an old tile? Is there some proxying going on somewhere (there's no explicit proxies)? Why is it random which tiles update? More to the point, why should I need to do anything with the cache/refreshing etc. Why isn't the date handling from the server telling Chrome the tile is out of date? I see the headers have an expiry date with the tile, but the old tile seems to persist even beyond that. David ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk - No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.1831 / Virus Database: 2092/4569 - Release Date: 10/23/11 ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
[OSM-talk] Map tiles in Chrome
I'm very puzzled by Chrome's behaviour with respect to the main Mapnik map tiles. When I'm working on an area, it is very common for a tile not to visibly update after refreshing after uploading some changes. Some do, some don't, especially at high zoom levels When I do a status on the tile, it is clear it has been re-rendered. It's not that it is stuck in a rendering queue - the renderer has finished. If I clear the Chrome cache, it still doesn't drop the old rendering. If I drop the Chrome cache and restart Chrome it still doesn't let go. The only way I have found that is certain to display the new tile is: 1. Right Click on the tile in the home page and choose 'Show image in now tab' 2. Go to the new tab, and hard refresh (CTRL+F5) 3. Restart chrome (a hard refresh or a click on Permalink after step 2 isn't sufficient). So what's going on? If the cache is empty, is the server really serving an old tile? Is there some proxying going on somewhere (there's no explicit proxies)? Why is it random which tiles update? More to the point, why should I need to do anything with the cache/refreshing etc. Why isn't the date handling from the server telling Chrome the tile is out of date? I see the headers have an expiry date with the tile, but the old tile seems to persist even beyond that. David ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Map tiles in Chrome
David, On 10/21/2011 03:58 PM, David Earl wrote: So what's going on? If the cache is empty, is the server really serving an old tile? Is there some proxying going on somewhere (there's no explicit proxies)? Why is it random which tiles update? This is unlikely to be the problem but just to be sure - you're not on any kind of 3G network or so? Because some of the mobile providers do all sorts of nasty things with images embedded in web sites and i wouldn't be surprised if that breaks map updates. Bye Frederik ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Map tiles in Chrome
On 21/10/2011 15:43, Frederik Ramm wrote: This is unlikely to be the problem but just to be sure - you're not on any kind of 3G network or so? Because some of the mobile providers do all sorts of nasty things with images embedded in web sites and i wouldn't be surprised if that breaks map updates. No, it's on 50Mbit Virgin Media cable. Incidentally, I also see the problem on Safari on iPad (also on the same network), though I don't have the same level of control on the cache so I cannot fix it at all there. David ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Map tiles in Chrome
Yeah, I've seen weird behavior in Chrome too. It used to be very good about refreshing tiles a few months ago but then it seems like something changed. Although I thought dropping the cache was good enough to force mine to get fresh tiles. Don't know that I've tried recently. I just use Opera when I want to see updated tiles. If you open a tile in a new tab and refresh it, the new version immediately gets displayed in the slippy map too. Toby ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Map tiles in Chrome
-BEGIN PGP SIGNED MESSAGE- Hash: SHA512 Op 21-10-11 17:39, Toby Murray schreef: Yeah, I've seen weird behavior in Chrome too. It used to be very good about refreshing tiles a few months ago but then it seems like something changed. What is mod_tile using for content expiration? Etags? Expires? Stefan -BEGIN PGP SIGNATURE- Version: GnuPG v2.0.18 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEAREKAAYFAk6hljYACgkQYH1+F2Rqwn38iwCfUJ0KEOXRWk+uldnOP5G/WTp1 SH0AoI15NIv+goA2KZ8Hlz5VHNt6LiW5 =V1hL -END PGP SIGNATURE- ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
