A bit more info on this. I tried using the Fiddler HTTP
debugging proxy to get a better idea of whether/when messages were
getting lost. I was not able to reproduce the problem while messages
were going through Fiddler. I don't know if this is because it made the
message processing less bursty, or what. When I turned Fiddler off I was able
to reproduce the problem again.
I am using the latest version of OpenLayers, version 2.11.
________________________________
From: Michael Katz <[email protected]>
To: "[email protected]" <[email protected]>
Sent: Friday, October 21, 2011 5:05 PM
Subject: [OpenLayers-Users] OpenLayers apparently dropping tile requests when
zooming quickly (?)
(Sorry, I seem to have mistakenly appended this question to another thread.
Reposting hopefully as its own topic.)
I am serving 256x256-pixel tiles (OpenLayers.Layer.XYZ) from my own local web
server, which are overlayed on top of a Google base map.
If I repeatedly double-click on the openlayers map to zoom repeatedly, it fires
off a rapid stream of tile requests to the local web server. However, I find
that if often fails
to fire the complete set of necessary requests for the final zoom level. For
instance, suppose I zoom quickly from level 3 to level 8 by double-clicking on
the center of the map five time. When I get to level 8, it might fill in only
three of
the nine visible overlay tiles in the view. As far as I can tell, the other six
XYZ tile requests never were made by openlayers to the local web server. Is
this expected behavior? For instance, is there some point at which
openlayers stops issuing tile requests if there are too many requests
outstanding?
(In my case it may take a few seconds to generate each tile, so there is indeed
a backlog of tile requests for those zoom levels I quickly passed through. The
Google basemap tiles, on the other hand, never seem to get lost, but I don't
know if this is because they are served more quickly than my tiles, or what.)
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