Hi Danny,
A couple of questions to better understand your issue:
- Did you see any log message for those black images?
- Can you provide some more info about your system configuration? (OS at
least).
When you do very zoomed out request (as you want to see the whole word in a
single view) the imageMosaic have to read all the granules involved at that
level (so it has to read 2100 files). If your layer is configured to use
JAI imageRead (USE_JAI_IMAGEREAD = true), then it may run out of file
descriptors. Indeed, JAI ImageRead may keeps a lot of files open due to its
deferred execution loading. Switching this parameter to false will let the
ImageMosaic use immediate (in memory) read operations which means: open the
file -> read what it needs -> close the file. You may also consider set
allowMultithreading = true, which performs those read operations
concurrently, using the configured Thread pool executor (see the Settings
-> Coverage Access configuration page).
However, since your mosaic is made of a big number of files you may also
consider setting up an Image Pyramid on top of it.
Please, let us know.
Best regards,
Daniele
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On Tue, Feb 3, 2015 at 12:33 AM, Danny Cheng <[email protected]>
wrote:
> Hi,
>
>
>
> I have an image mosaic layer with around 2100 granules that covers the
> whole world. Through testing, I realized that not all of my granules being
> displayed properly. The granules that aren’t displayed properly are
> returned from GeoServer as black images. If I make a smaller image mosaic
> layer with 30 granules in the region that was returning black images by
> GeoServer, this time around GeoServer is sending back the actual images
> correctly. Is there a recommended image mosaic configuration for large
> amount of granules? I tried setting the MaxAllowedTiles in the layer
> configuration, but that didn’t seem to fix my problem.
>
>
>
> Thanks,
>
> Danny
>
>
>
>
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