Config:
Java version "1.6.0_02"
JBoss 4.2.2.GA which ships with:
- JBoss Cache 1.4.1.SP5
- Hibernate EntityManager 3.2.1.GA
- Hibernate Annotations 3.2.1.GA
- Hibernate 3.2.4.sp1
Overview:
I'm quite new to JBoss caching and have been able to place queries into the
cache. For reasons beyond me, the eviction policy I have defined for my cache
region is not firing and therefore the object is not removed from memory after
the timeToLiveSeconds value has passed. To add to this, periodically every
node within the cache is removed by
org.jboss.cache.eviction.BaseEvictionAlgorithm.
I believe that I have setup the cache eviction policies correctly within
all/deploy/ejb3-entity-cache-service.xml as follows:
<attribute name="InitialStateRetrievalTimeout">17500</attribute>
| <attribute name="SyncReplTimeout">17500</attribute>
| <attribute name="LockAcquisitionTimeout">15000</attribute>
| <attribute name="EvictionPolicyConfig">
| <config>
| <attribute name="wakeUpIntervalSeconds">1</attribute>
|
| <!-- Cache wide default -->
| <region name="/_default_"
policyClass="org.jboss.cache.eviction.LRUPolicy">
| <attribute name="maxNodes">5000</attribute>
| <!-- small number for testing only -->
| <attribute name="timeToLiveSeconds">10</attribute>
| </region>
| <!-- Query region -->
| <region name="/myprefix/Queries"
policyClass="org.jboss.cache.eviction.LRUPolicy">
| <attribute name="maxNodes">50</attribute>
| <!-- small number for testing only -->
| <attribute name="timeToLiveSeconds">5</attribute>
| </region>
| </config>
| </attribute>
I have enabled query caching by defining the following in persistence.xml:
| <properties>
| <property name="hibernate.cache.use_query_cache" value="true"/>
| <property name="hibernate.cache.use_second_level_cache" value="true"/>
| <property name="hibernate.cache.region_prefix" value="myprefix"/>
| <property name="hibernate.cache.provider_class"
value="org.jboss.ejb3.entity.TreeCacheProviderHook" />
| <property name="hibernate.treecache.mbean.object_name"
value="jboss.cache:service=EJB3EntityTreeCache" />
| </properties>
|
|
|
I can see the query nodes within the TreeCache by enabling and running the
following:
<mbean code="org.jboss.cache.TreeCacheView"
name="jboss.cache:service=TreeCacheViewEJB3EntityTreeCache">
| <depends>jboss.cache:service=EJB3EntityTreeCache</depends>
| <attribute
name="CacheService">jboss.cache:service=EJB3EntityTreeCache</attribute>
| </mbean>
Below is the named query with caching enabled:
| @NamedQuery(name = "Venue.findById", query = "SELECT v FROM Venue v WHERE
v.venueId = :id", hints=
| {...@queryhint(name="org.hibernate.cacheable",value="true"),
| @QueryHint(name="org.hibernate.cacheRegion", value="Queries")})
These two lines worry me (any idea why config: null appears?):
| [org.jboss.system.ServiceConfigurator] EvictionPolicyConfig set to [config:
null] in jboss.cache:service=EJB3EntityTreeCache
| [org.jboss.cache.TreeCache] setEvictionPolicyConfig(): [config: null]
I can see that the region is created and the eviction timer is started:
[org.jboss.cache.eviction.LRUConfiguration] parseConfig: name --
/myprefix/Queries maxNodes -- 50 timeToLiveSeconds -- 5 maxAgeSe
| onds -- 0
| [org.jboss.cache.eviction.RegionManager] createRegion(): creating region
for fqn- /myprefix/Queries
| [org.jboss.cache.eviction.RegionManager] Starting eviction timer
| [org.jboss.cache.TreeCache] Started jboss.cache:service=EJB3EntityTreeCache
I can see the the query being cached but under a different fqn as I defined
(and a different cache maybe??):
[org.hibernate.cache.StandardQueryCache] caching query results in region:
myprefix./Queries; timestamp=12354921739
This line appears periodically and removes everything from the cache:
[org.jboss.cache.eviction.BaseEvictionAlgorithm] Visiting node that was not
added to eviction queues. Assuming that it has 1 element
Any help with this issue would be greatly appricated.
Rob.
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