Hi Marek,
the system property is currently the only way to go.

Best regards
Andrea

On Sun, Apr 16, 2023 at 8:00 PM Marek Kadlečík <marekkadleci...@gmail.com>
wrote:

> Hello folks,
> By investigating the stuff, I assume the error is caused by http range
> request rejection from the side of MinIO. As documentation of COG says (
> https://docs.geoserver.org/latest/en/user/community/cog/cog.html), that
> the plugin is based on these range requests, I found an github issue for
> minio (https://github.com/minio/minio/issues/5285) which states that
> multiple http ranges are not supported. However this did not discourage me
> from trying and I came up with an idea of increasing the
> it.geosolutions.cog.default.header.length system property. From COG
> plugin doc:
>
> *By default, when accessing a COG, an initial chunk of 16 KB is read in
> attempt to parse the header so that the reader will have the offset and
> length of the available tiles. When dealing with files hosting many tiles,
> it is possible that the whole header won’t fit in the initial chunk. In
> this case additional reads (chunks of the same size) will be progressively
> made to complete loading the header.
> A it.geosolutions.cog.default.header.length system property can be
> configured to set the length (in bytes) of the reading chunk. Tuning this
> so that the header is read with few extra requests can help improve
> performance. A value too large can cause memory consumption issues and will
> reduce efficiency, as un-necessary data will be read.*
>
> The only thing is that I don't know which is the easiest way to change the
> system property, since I'm running geoserver in docker container. What do
> you recommend?
>
> Have a nice rest of the day,
>
> Marek
>
> so 15. 4. 2023 o 16:00 Marek Kadlečík <marekkadleci...@gmail.com>
> napísal(a):
>
>> Hello folks,
>> I'm playing with the COG plugin and bumping into an error Unable to read
>> header for <url> (see picture). What does this mean? I translated tif file
>> beforehand using gdal_translate nejakeId_B02.tif
>> nejakeId_B02_translated.tif -of COG -co COMPRESS=LZW
>> As for S3 store I'm using local instance of minio object storage. I found
>> this piece of email communication
>> https://sourceforge.net/p/geoserver/mailman/message/37227114/, where the
>> problem seems to be the minio refusing the range requests. I hope the
>> convention <adress>:<port>/<bucket_name>/<object_name> still applies
>> also in minio.
>>
>> Do you guys know where the problem could be? Would help me a lot.
>>
>> Best regards,
>>
>> Marek
>>
>>
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-- 

Regards,

Andrea Aime

==
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==

Ing. Andrea Aime
@geowolf
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GeoSolutions Group
phone: +39 0584 962313

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