Dear List,
Overview:
 I'm using geoserver 2.17.2 and I've just upgraded the environment from a
previous installation having 2.17.0 and a single instance to a new managed
instance group (autoscaled number of instances) with a shared High
performance disk NFS (provided by GCP).
We know that having the cache shared on an NFS it's **not the best** but we
would like to keep maintenance/costs/etc low so we're also sharing
GWC_CACHE_DIR over the same NFS volume (with embedded GWC).
We're also redirecting the traffic by source IP to redirect the same user
to a single geoserver where controlflow has been properly configured (lower
throughput but better control of the thresholds).
Now I'm performing JMeter stress tests and Manual tests to see the
throughput and the collisions on GWC miss and it performs not bad at all.

Problem:
- Using layer preview I'm obtaining something that I've never seen before:
   https://pasteboard.co/Jk38oZB.png
- Not reproducible, it's random!!!
- StackTrace is attached

Questions:
- I'm wondering if the update to Geoserver 2.17.2 from 2.17.0 has modified
something on that side? (looking at the commits I can't see
anithing recent)
https://github.com/geoserver/geoserver/blob/cf77a0baef45eeb866c622bbbccf917bc5eb28d0/src/gwc/src/main/java/org/geoserver/gwc/layer/CatalogConfiguration.java#L253
- Can the NFS filesystem influence this? (don't think so...)
- can be related to https://github.com/GeoWebCache/geowebcache/issues/688

Thanks for any hint,
Regards,
C.


-- 
Mr. Carlo Cancellieri
*skype*: ccancellieri
*Twitter*: @cancellieric
*LinkedIn*: http://it.linkedin.com/in/ccancellieri/

Attachment: error.log
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