[OpenLayers-Dev] MVT: Problems with missing pbf files

[Christian Mayer]

Hi Andreas,

I wrote a little example app [1] to show the error. It seems that the
error is gone in OpenLayers v4.4.2. If you want to see how it behaved
before have a look at my example, which uses OL v 4.3.4.

Cheers
Chris

[1] https://apps.meggsimum.de/ol-vt-issue/


On 19.10.2017 17:17, Andreas Hocevar wrote:
> Hey Chris,
>
> this sounds like a bug. Can you please create a ticket and provide a
> codepen that shows the issue?
>
> Thanks,
> Andreas.
>
> On Thu, Oct 19, 2017 at 5:11 PM, Christian Mayer <ml-cm at meggsimum.de> wrote:
>> Hi OL-Devs,
>>
>> I have a setup with a VectorTile layer based on Mapbox Vector Tiles (created
>> with GeoServer / Geowebcache). To save time at transferring the pbf-files to
>> the target environment all empty pbf-files were deleted. This results in
>> HTTP 404s (of course) when OpenLayers tries to load the missing tiles.
>> I expected that this won't bring any problems and that OL is just ignoring
>> them. But unfortunately a JS-exception occurs if in the current map-exent is
>> one of the missing tiles.
>> It seems that the "tileProjection" is undefined for the given "sourceTile",
>> so the operation tileProjection.getUnits() fails, see here [1]. So it seems
>> that the missing tile is not ignored in the code and due to the lack of
>> information the rendering process fails.
>> If I add an emtpy pbf-file, so no HTTP 404 occurs anymore, the exception is
>> gone. Even though no more information is provided (from my humble point of
>> view).
>>
>> So here are some questions: Can someone confirm this behavior? Is this
>> wanted behavior for some reasons? Or is this even a bug or an edge case?
>>
>> I am using OpenLayers v4.3.4.
>>
>> Thanks in advance for any hint / help / clarification.
>>
>> Cheers
>> Chris
>>
>> [1]
>> https://github.com/openlayers/openlayers/blob/v4.3.4/src/ol/renderer/canvas/vectortilelayer.js#L139
>>
>>
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