[GRASS-user] Problem with zstd compressed rasters

[Markus Metz]

On Fri, Mar 29, 2019 at 11:20 AM Micha Silver <tsvibar at gmail.com> wrote:
>
> Hello all:
>
> I have some GRASS data that I share between different computers. The
newer machine got updated recently to version 7.6.1, and rasters are by
default compressed with zstd. The older machine (Linux Mint 18.3) was
running 7.4 and (I think) did not support zstd. So those rasters created on
the newer machine will no longer open on the older one. I updated to GRASS
7.6.1 (a word of thanks to the ubuntugis-unstable packagers!) and added the
libzstd libraries, but still rasters created on the newer machine will not
open on the older one. The difference between them is the version of
libzstd. Is there a minimum required version of zstd??

Not really, if anything, version 1.x.
>
>
> On the old machine:
>
>
> micha at RMS ~ $ g.version
> GRASS 7.6.1 (2019)
> micha at RMS ~ $ zstd --version
> *** zstd command line interface 64-bits v1.3.1, by Yann Collet ***
> micha at RMS ~ $ r.univar slope
> WARNING: ZSTD compression error -2: Unknown frame descriptor
> ERROR: Error uncompressing raster data for row 2913 of <slope>
> micha at RMS ~ $ ldd /usr/lib/grass76/bin/r.univar | grep zstd
>     libzstd.so.0 => /usr/lib/x86_64-linux-gnu/libzstd.so.0
(0x00007fadf663c000)
>
>
> The new machine has zstd version 1.3.8, and everything works fine. But
not on the old machine. Is my problem the difference in zstd versions?

I had something similar before, the error was caused by a corrupted file.
If the old machine uses a copy of the mapset of the new machine, check e.g.
with md5sum if the corresponding cell or fcell files are identical. It
could also be a disk IO problem.

HTH,

Markus M
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