Hi,
We are using an embedded instance of Tomcat and would like to use a FileStore
for Session storage to keep memory requirements low while still allowing to
have many sessions opened. This is a single tomcat instance, sharing sessions
with other instances is not needed.
As I embed Tomcat, I have created the FileStore as follows:
Context context = tomcat.addWebapp(contextRoot, webDir);
tomcat.start();
{ // Override the default Manager and set a persistent manager which
can store Sessions on disk
PersistentManager manager = new PersistentManager();
FileStore store = new FileStore();
store.setDirectory(new File(workDir, "store").getAbsolutePath());
manager.setStore(store);
context.setManager(manager);
manager.setMaxActiveSessions(-1);
manager.setMaxIdleSwap(500);
manager.setMinIdleSwap(200);
manager.setMaxIdleBackup(400);
}
As far as I understood documentation, this should allow me to have an unlimited
number of sessions (while the session timeout of 30 minutes still applies), but
swaps out the sessions at least after 500 seconds.
It basically works fine this way, only a limited number of sessions are held in
memory, others are swapped out. The only issue is that I start getting the
following log output frequently after aprox. half an hour when the first
sessions are timing out:
2011-04-06 12:17:20 Custome SEVERE [PersistentManagerBase]
persistentManager.swapInInvalid
2011-04-06 12:17:20 Custome SEVERE [PersistentManagerBase]
persistentManager.swapInInvalid
2011-04-06 12:17:20 Custome SEVERE [PersistentManagerBase]
persistentManager.swapInInvalid
2011-04-06 12:17:21 Custome SEVERE [PersistentManagerBase]
persistentManager.swapInInvalid
2011-04-06 12:17:22 Custome SEVERE [PersistentManagerBase]
persistentManager.swapInInvalid
2011-04-06 12:17:22 Custome SEVERE [PersistentManagerBase]
persistentManager.swapInInvalid
2011-04-06 12:17:22 Custome SEVERE [PersistentManagerBase]
persistentManager.swapInInvalid
2011-04-06 12:17:22 Custome SEVERE [PersistentManagerBase]
persistentManager.swapInInvalid
When looking at the code in PersistentManager and StandardSession, I can not
explain what this severe-log tries to tell me. It seems we get this for every
session that is timing out after 30 minutes of inactivity. It seems the
expiry-check marks the session as "invalid" which in turn causes the check in
swapIn() to fail.
Now my question:
- As it seems to work nevertheless, can I safely ignore this error
message or does it indicate that I am doing something fundamentally wrong with
PersistentManager and FileStore?
Thanks... Dominik
Dominik Stadler, Team Lead, R&D dynaTrace<http://www.dynatrace.com/>,
dominik.stad...@dynatrace.com<mailto:dominik.stad...@dynatrace.com> Skype:
stadler.dominik
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