0 Replies Latest reply on Nov 15, 2007 3:25 AM by Yair Zaslavsky

    A question about passivation and configuration of jbosscache

    Yair Zaslavsky Newbie

      Hi all,
      I read in the documents of JBoss Cache (1.4.1) about passivation, and it seems that it can help me to do the following task:
      I would like to set a region of 100 maxNodes, and if the number of the nodes places in the cache (for the region) exceeds 100, the nodes will be evicted, but their data will be stored in secondary storage.

      I decided that my secondary storage will be a file system. so I decided to use a FIleCacheLoader.
      In addition, I need replication between 2 cache instances.
      Here is my configuration XML for one of the nodes:



      <?xml version="1.0" encoding="UTF-8"?>
      
      <!-- ===================================================================== -->
      <!-- -->
      <!-- Sample TreeCache Service Configuration -->
      <!-- -->
      <!-- ===================================================================== -->
      
      <server>
      
       <classpath codebase="./lib" archives="jboss-cache.jar, jgroups.jar"/>
      
      
       <!-- ==================================================================== -->
       <!-- Defines TreeCache configuration -->
       <!-- ==================================================================== -->
      
       <mbean code="org.jboss.cache.TreeCache"
       name="jboss.cache:service=TreeCache">
      
       <depends>jboss:service=Naming</depends>
       <depends>jboss:service=TransactionManager</depends>
      
       <!--
       Configure the TransactionManager
       -->
       <attribute name="TransactionManagerLookupClass">org.jboss.cache.DummyTransactionManagerLookup</attribute>
      
       <!--
       Isolation level : SERIALIZABLE
       REPEATABLE_READ (default)
       READ_COMMITTED
       READ_UNCOMMITTED
       NONE
       -->
       <attribute name="IsolationLevel">REPEATABLE_READ</attribute>
      
       <!--
       Valid modes are LOCAL
       REPL_ASYNC
       REPL_SYNC
       INVALIDATION_ASYNC
       INVALIDATION_SYNC
       -->
       <attribute name="CacheMode">REPL_SYNC</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">TreeCache-Cluster</attribute>
      
       <!-- JGroups protocol stack properties. Can also be a URL,
       e.g. file:/home/bela/default.xml
       <attribute name="ClusterProperties"></attribute>
       -->
      
       <attribute name="ClusterConfig">
       <config>
       <!-- UDP: if you have a multihomed machine,
       set the bind_addr attribute to the appropriate NIC IP address, e.g bind_addr="192.168.0.2"
       -->
       <!-- 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="228.1.2.3" mcast_port="48866" bind_addr="192.168.10.56"
       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"
       loopback="false"/>
       <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" />-->
       <FD_SOCK/>
       <VERIFY_SUSPECT timeout="1500"
       up_thread="false" down_thread="false"/>
       <pbcast.NAKACK gc_lag="50" retransmit_timeout="600,1200,2400,4800"
       max_xmit_size="8192" up_thread="false" down_thread="false"/>
       <UNICAST timeout="600,1200,2400" window_size="100" min_threshold="10"
       down_thread="false"/>
       <pbcast.STABLE desired_avg_gossip="20000"
       up_thread="false" down_thread="false"/>
       <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="true" down_thread="true"/>
       </config>
       </attribute>
      
       <!--
       Whether or not to fetch state on joining a cluster
       NOTE this used to be called FetchStateOnStartup and has been renamed to be more descriptive.
       -->
       <attribute name="FetchInMemoryState">true</attribute>
      
       <!--
       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">20000</attribute>
      
       <!-- Max number of milliseconds to wait for a lock acquisition -->
       <attribute name="LockAcquisitionTimeout">15000</attribute>
      
       <!-- Name of the eviction policy class. -->
       <attribute name="EvictionPolicyClass">org.jboss.cache.aop.eviction.AopLRUPolicy</attribute>
      
       <!-- Specific eviction policy configurations. This is LRU -->
       <attribute name="EvictionPolicyConfig">
       <config>
       <attribute name="wakeUpIntervalSeconds">5</attribute>
       <!-- Cache wide default -->
       <region name="/_default_">
       <attribute name="maxNodes">5000</attribute>
       <attribute name="timeToLiveSeconds">1000</attribute>
       </region>
       <region name="/org/jboss/data">
       <attribute name="maxNodes">5000</attribute>
       <attribute name="timeToLiveSeconds">1000</attribute>
       </region>
       <region name="/people/friends">
       <attribute name="maxNodes">100</attribute>
       <attribute name="timeToLiveSeconds">1000</attribute>
       </region>
       <region name="/org/jboss/test/data">
       <attribute name="maxNodes">5</attribute>
       <attribute name="timeToLiveSeconds">4</attribute>
       </region>
       </config>
       </attribute>
      
      
       <!-- New 1.3.x cache loader config block -->
       <attribute name="CacheLoaderConfiguration">
       <config>
      
       <passivation>true</passivation>
       <shared>false</shared>
      
       <cacheloader>
       <class>org.jboss.cache.loader.FileCacheLoader</class>
       <!-- Passivate to the server data dir -->
       <properties>
       location=/tmp/bla
       </properties>
       <async>false</async>
       <fetchPersistentState>true</fetchPersistentState>
       <ignoreModifications>false</ignoreModifications>
       </cacheloader>
      
       </config>
       </attribute>
      
       </mbean>
      
      
       <!-- Uncomment to get a graphical view of the TreeCache MBean above -->
       <!-- <mbean code="org.jboss.cache.TreeCacheView" name="jboss.cache:service=TreeCacheView">-->
       <!-- <depends>jboss.cache:service=TreeCache</depends>-->
       <!-- <attribute name="CacheService">jboss.cache:service=TreeCache</attribute>-->
       <!-- </mbean>-->
      
      
      </server>
      



      I placed 150 objects under /people/friends, and defined my own tree listener to report me when there is an eviction.
      Evictions did occur, but i saw no files in the file system.
      When I switched passivation to false, I saw that immediately when I put objects in the cache, the FIleCachLoader "puts" the objects in the filesystem, but it has nothing to do with evicting them.
      Can you tell me what is wrong in my configuration and if the thing I desire to do (place objects in the file system are they are evicted, and read them from the file system, when i try to access them again) is possible?

      Thanks in advance,
      Yair