Hello.
I do this in my jcs cache. The items in the cache is 0-30MB each. The
total volume is ~20GB. Instead of the standard indexed disc cache, I
use a file based cache. The key is converted to a filename and each
item is stored as a separate file. Several jvms can share the same
cache and the cache can be rsynced between nodes while running the
application.
This setup might be slow for caches with lots of small objects, but it
works very well with my setup.
The source code is attached to this issue:
https://issues.apache.org/jira/browse/JCS-58
To be able to hold as many objects as possible in ram without getting
OutOfMemoryException, I use this cache with a soft reference cache.
https://issues.apache.org/jira/browse/JCS-54
Regards,
- Tore.
On Jun 17, 2009, at 10:23, Silvano wrote:
Since we have a large cache that needs significant time to be
populated, we need to be able to copy the files of the regions
configured as Indexed Disk Cache between different installations.
We believe this can be done safely if we turn off the jvm, but we
would need to copy safely the files while the jvm is running.
However it seems that the key files are written only when you turn
off the jvm (at least the size changes when we turn off the jvm, so
we suspect that they are not synchronized to disk in normal
operations).
We can make sure at application level that nobody writes in the
cache during the file copy process, but is this sufficient?
Can anybody recommend a solution to this issue?
Best regards,
Silvano.
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