10 Replies Latest reply on Jun 16, 2008 7:55 AM by Damien

    Exclusive lock is acquired on all nodes not one only

    Damien Newbie

      Hi all,

      I use TreeCache (JbossCache 1.4.1 SP3 with Jboss 4.0.5GA) with a cache configured in a clustered environnement.
      I set in PESSIMISTIC/SERIALIZABLE mode and I want to lock only one node when I read or write to it.
      For example, if I have /root/subroot/A and /root/subroot/B, I read node A, I want to have an exclusive lock on it , but I want also to read with another transaction node B.

      But at this moment, the cache is entirely locked! I cannot read node B at all.

      <?xml version="1.0" encoding="UTF-8" ?>
      <server>
       <classpath codebase="./lib" archives="jboss-cache.jar, jgroups.jar" />
       <mbean code="org.jboss.cache.TreeCache" name="jboss.cache:service=MyTreeCache">
       <depends>jboss:service=Naming</depends>
       <depends>jboss:service=TransactionManager</depends>
       <depends>jboss.jca:service=DataSourceBinding,name=my-ds</depends>
      
       <attribute name="TransactionManagerLookupClass">org.jboss.cache.JBossTransactionManagerLookup</attribute>
       <attribute name="NodeLockingScheme">PESSIMISTIC</attribute>
       <attribute name="IsolationLevel">READ_UNCOMMITTED</attribute>
      
       <attribute name="CacheMode">REPL_SYNC</attribute>
       <attribute name="ClusterName">
       master-${jboss.partition.name:Cluster}
       </attribute>
       <attribute name="ClusterConfig">
       <config>
       <UDP mcast_addr="${jboss.partition.udpGroup:228.2.2.14}"
       mcast_port="48252" ip_ttl="${jgroups.mcast.ip_ttl:2}"
       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" />
       <VERIFY_SUSPECT timeout="1500" up_thread="false"
       down_thread="false" />
       <pbcast.NAKACK gc_lag="50" max_xmit_size="8192"
       retransmit_timeout="600,1200,2400,4800" 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="false"
       down_thread="false" />
       </config>
       </attribute>
       <attribute name="InitialStateRetrievalTimeout">6000</attribute>
       <attribute name="SyncReplTimeout">10000</attribute>
       <attribute name="LockAcquisitionTimeout">4000</attribute>
      
      </mbean>
      </server>


      How can achieve my use case ?