Hi,
I was looking into some jstack output on a trouble server and found what
looks
like a relatively serious scalability issue in the integrated GWC:
http://jira.codehaus.org/browse/GEOS-5463
Basically, if you have N cached layers queried in the same area at the same
time
(not difficult) and they all need to build tiles from scratch (which
happens if you
are changing data often enough) then all of them with synch each other
out and only one will manage to render, whilst the others, even if the are
different layers, will have to wait.
See the jira for a more detailed explanation.
The fix is really simple, we just need to remove a "static" keyword from
this declaration:
private static final CanonicalSet<GridLocObj> META_GRID_LOCKS =
CanonicalSet
.newInstance(GridLocObj.class);
This way each layer has its own canonicalizer for the metatile lock
objects, instead of sharing
one among all layers.
Ok to go?
Cheers
Andrea
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