Hi everybody,
recently one of our customers was having some issues with threads blocked
inside the default LRUAuthenticationCacheImpl class (default implementation
of the AuthenticationCache mechanism in Geoserver).
Searching on the internet we found other users experimenting similar
behaviours, so probably the default cache implementation is not very stable
under heavy load or particular conditions.
To solve the issue we experimented an alternative implementation using the
guava Cache class.
We found that guava Cache already implements all
the LRUAuthenticationCacheImpl functionality (expiration on idle and live
timeouts, eviction, and so on), so it was a very easy task.
In the future we could also think to leverage advanced guava cache
functionality (such as the automatic "loading" of missing entries).
This new implementation is working better for our customer, so far.
The only thing that we did not implement is support for entry by entry
expiration times (I found that this is used in GeoServerCompositeFilter
using request attributes, but I don't understand exactly the purpose, can
anyone explain me why is that used?).
My proposal is to add the new implementation to Geoserver main, since guava
is already a dependency and this would lead to a simpler implementation
than the existing one, and one that is based on a well known library.
We could:
- add the new implementation but leave the old one as the default (the new
one can be enabled adding a bean definition in applicationContext.xml)
- add the new implementation and set it as the default, to see if it
behaves better than previous one for a larger audience (the old one could
be reenabled using the same applicationContext.xml approach)
What do you think? Is anyone interested in this?
Thanks
Mauro
--
==
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Dott. Mauro Bartolomeoli
@mauro_bart
Senior Software Engineer
GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272
http://www.geo-solutions.it
http://twitter.com/geosolutions_it
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