Hello,
I allow myself to revive the topic as we have the same problem and can't find a solution.
We are using Jboss Cache 3.2.1 to store and retrive picture encapsulated in an HttpResponse.
We have this problem when trying to use JDBCCacheLoader (on a SQL Server database) instead of FileCacheLoader.
The lock configuration is as follow :
<locking
isolationLevel="READ_COMMITTED"
lockAcquisitionTimeout="10000"
nodeLockingScheme="mvcc"
writeSkewCheck="false"
concurrencyLevel="1000" />
But few trials to change these values don't significatly affect the behaviour.
The error "org.jboss.cache.lock.TimeoutException: Unable to acquire lock on Fqn [/command_image/style_20/root/3/2/2/2] after [10000] milliseconds for requestor [Thread[http-8080-49,5,main]]! Lock held by [null]"
comes when doing stress test on the cache (100 requests in 10 sec repeted 10 times with JMeter)
The error comes more likely after a while, the first requests use to pass sucessfullly.
The application that uses JBoss Cache used an earlier version (1.4) before I upgraded it so I may have forgotten something in the migration.
I am new in the JBoss Cache's world so I can have forgotten something very obvious.
Thanks for any help.
Nicolas.