2 Replies Latest reply on May 14, 2007 8:57 AM by Angus Morison

    PojoCache object not retrieved from file store after evictio

    Angus Morison Newbie

      I have a PojoCache working on JBoss AS 4.0.5.
      I have configured an Eviction Policy and a FileCacheLoader.
      When I put an object into the cache, it is correctly inserted into the file system.
      When the cache initialises it correctly reads the objects in the file system into its memory.
      When my program, which accesses the cache, connects to the cache, the object is brought into memory and can be accessed.
      The object is correctly evicted from memory after the configured time.
      But after that, if I try to retrieve the object (either with the MBean printDetails() or programatically) it is no longer in the cache.
      I understand from the TreeCache.pdf that this is not correct.
      My xx-service.xml file is based on the example local-passivation-service.xml file, which was the only one I could find with both an Eviction Policy and CacheLoader.
      My xx-service.xml file is below:

      <?xml version="1.0" encoding="UTF-8"?>
      <!-- ===================================================================== -->
      <!-- -->
      <!-- Sample PojoCache Service Configuration -->
      <!-- -->
      <!-- ===================================================================== -->
       <!-- Used inside JBoss AS -->
       <classpath codebase="./lib" archives="jboss-cache.jar, jgroups.jar"/>
       <!-- ==================================================================== -->
       <!-- Defines configuration -->
       <!-- ==================================================================== -->
       <mbean code="org.jboss.cache.aop.PojoCache"
       <!-- Used inside JBoss AS -->
       <attribute name="TransactionManagerLookupClass">org.jboss.cache.JBossTransactionManagerLookup</attribute>
       Configure the TransactionManager
       Note: having no TransactionManager configured results in this log msg:
       WARN [org.jboss.cache.TreeCache] method _lock() should not be invoked on TreeCache
       Node locking scheme:
       PESSIMISTIC (default)
       <attribute name="NodeLockingScheme">OPTIMISTIC</attribute>
       Note that this attribute is IGNORED if your NodeLockingScheme above is OPTIMISTIC.
       Isolation level : SERIALIZABLE
       REPEATABLE_READ (default)
       <attribute name="IsolationLevel">REPEATABLE_READ</attribute>
       Valid modes are LOCAL
       <attribute name="CacheMode">REPL_ASYNC</attribute>
       Just used for async repl: use a replication queue
       <attribute name="UseReplQueue">false</attribute>
       Replication interval for replication queue (in ms)
       <attribute name="ReplQueueInterval">0</attribute>
       Max number of elements which trigger replication
       <attribute name="ReplQueueMaxElements">0</attribute>
       <!-- Name of cluster. Needs to be the same for all clusters, in order
       to find each other
       <attribute name="ClusterName">sipnotif</attribute>
       <!-- JGroups protocol stack properties. Can also be a URL,
       e.g. file:/home/bela/default.xml
       <attribute name="ClusterProperties"></attribute>
       <attribute name="ClusterConfig">
       <!-- UDP: if you have a multihomed machine,
       set the bind_addr attribute to the appropriate NIC IP address -->
       <!-- UDP: On Windows machines, because of the media sense feature
       being broken with multicast (even after disabling media sense)
       set the loopback attribute to true -->
       <UDP mcast_addr="" mcast_port="45577"
       ip_ttl="64" ip_mcast="true"
       mcast_send_buf_size="150000" mcast_recv_buf_size="80000"
       ucast_send_buf_size="150000" ucast_recv_buf_size="80000"
       <PING timeout="2000" num_initial_members="3"
       up_thread="false" down_thread="false"/>
       <MERGE2 min_interval="10000" max_interval="20000"/>
       <FD shun="true" up_thread="true" down_thread="true"/>
       <VERIFY_SUSPECT timeout="1500"
       up_thread="false" down_thread="false"/>
       <pbcast.NAKACK gc_lag="50" retransmit_timeout="600,1200,2400,4800"
       up_thread="false" down_thread="false"/>
       <pbcast.STABLE desired_avg_gossip="20000"
       up_thread="false" down_thread="false"/>
       <UNICAST timeout="600,1200,2400" window_size="100" min_threshold="10"
       <FRAG frag_size="8192"
       down_thread="false" up_thread="false"/>
       <pbcast.GMS join_timeout="5000" join_retry_timeout="2000"
       shun="true" print_local_addr="true"/>
       <pbcast.STATE_TRANSFER up_thread="false" down_thread="false"/>
       The max amount of time (in milliseconds) we wait until the
       initial state (ie. the contents of the cache) are retrieved from
       existing members in a clustered environment
       <attribute name="InitialStateRetrievalTimeout">20000</attribute>
       Number of milliseconds to wait until all responses for a
       synchronous call have been received.
       <attribute name="SyncReplTimeout">15000</attribute>
       <!-- Max number of milliseconds to wait for a lock acquisition -->
       <attribute name="LockAcquisitionTimeout">10000</attribute>
       <attribute name="EvictionPolicyClass"></attribute>
       <!-- Name of the eviction policy class. We have commented it off to disable eviction.
       <attribute name="EvictionPolicyClass">org.jboss.cache.aop.eviction.AopLRUPolicy</attribute>
       <!-- Specific eviction policy configurations. This is LRU -->
       <attribute name="EvictionPolicyConfig">
       <attribute name="wakeUpIntervalSeconds">5</attribute>
       <!-- Cache wide default -->
       <region name="/_default_">
       <attribute name="maxNodes">5000</attribute>
       <attribute name="timeToLiveSeconds">1000</attribute>
       <region name="/mailboxes">
       <attribute name="maxNodes">100</attribute>
       <attribute name="timeToLiveSeconds">10</attribute>
       <!-- New 1.3.x cache loader config block-->
       <attribute name="CacheLoaderConfiguration">
       <attribute name="UseRegionBasedMarshalling">true</attribute>
       <!--<attribute name="InactiveOnStartup">true</attribute>-->

      I would be extremely greatful if someone could comment.