0 Replies Latest reply on Aug 29, 2005 1:15 PM by fmaredia

    Treecache Lock Error

    fmaredia Newbie

      System Configuration:
      JBoss AS 4.0.3 RC1
      Hibernate 2.1.8
      MySQL 4.1.7
      TreeCache (local)

      Sometimes we get read lock errors from our Cache. It happens when a user logs in or it just happens after a while. Everything works after "refreshing" the browser, but why does the following error occur:

      12:03:28,788 ERROR [IdentityLock] write lock for //com/at/hib/persistence/Employ
      ee/31 could not be acquired after 15000 ms. Locks: Read lock owners: []
      Write lock owner: <null>:48
       (caller=<null>:47, lock info: write owner=<null>:48 (activeReaders=0, activeWri
      ter=Thread[http-0.0.0.0-8080-3,5,jboss], waitingReaders=0, waitingWriters=0, wai
      tingUpgrader=0))
      12:03:28,788 ERROR [BookingDAO] org.jboss.cache.lock.TimeoutException: write loc
      k for //com/at/hib/persistence/Employee/31 could not be acquired after 15000 ms.
       Locks: Read lock owners: []
      Write lock owner: <null>:48
       (caller=<null>:47, lock info: write owner=<null>:48 (activeReaders=0, activeWri
      ter=Thread[http-0.0.0.0-8080-3,5,jboss], waitingReaders=0, waitingWriters=0, wai
      tingUpgrader=0))
      12:03:44,913 ERROR [IdentityLock] write lock for //com/at/hib/persistence/Countr
      ies/71 could not be acquired after 15000 ms. Locks: Read lock owners: [<null>:49
      ]
      Write lock owner: null
       (caller=<null>:50, lock info: read owners=[<null>:49] (activeReaders=1, activeW
      riter=null, waitingReaders=0, waitingWriters=0, waitingUpgrader=0))
      12:03:44,913 ERROR [PersonAccessDAO] org.jboss.cache.lock.TimeoutException: writ
      e lock for //com/at/hib/persistence/Countries/71 could not be acquired after 150
      00 ms. Locks: Read lock owners: [<null>:49]
      Write lock owner: null
       (caller=<null>:50, lock info: read owners=[<null>:49] (activeReaders=1, activeW
      riter=null, waitingReaders=0, waitingWriters=0, waitingUpgrader=0))
      12:03:44,913 ERROR [IdentityLock] write lock for //com/at/hib/persistence/Employ
      ee/31 could not be acquired after 15000 ms. Locks: Read lock owners: []
      Write lock owner: <null>:50
       (caller=<null>:49, lock info: write owner=<null>:50 (activeReaders=0, activeWri
      ter=Thread[http-0.0.0.0-8080-3,5,jboss], waitingReaders=0, waitingWriters=0, wai
      tingUpgrader=0))
      12:03:44,913 ERROR [BookingDAO] org.jboss.cache.lock.TimeoutException: write loc
      k for //com/at/hib/persistence/Employee/31 could not be acquired after 15000 ms.
       Locks: Read lock owners: []
      Write lock owner: <null>:50
       (caller=<null>:49, lock info: write owner=<null>:50 (activeReaders=0, activeWri
      ter=Thread[http-0.0.0.0-8080-3,5,jboss], waitingReaders=0, waitingWriters=0, wai
      tingUpgrader=0))


      Code for TreeCache.xml is the following:
      <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.JBossTransactionManagerLookup</attribute>
      
      
       <!--
       Node 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
       -->
       <attribute name="CacheMode">LOCAL</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 -->
       <!-- 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="45566"
       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"/>
       <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"
       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>
      
       <!--
       Max number of entries in the cache. If this is exceeded, the
       eviction policy will kick some entries out in order to make
       more room
       -->
       <attribute name="MaxCapacity">20000</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">10000</attribute>
      
       <!-- Max number of milliseconds to wait for a lock acquisition -->
       <attribute name="LockAcquisitionTimeout">15000</attribute>
      
       <!-- Max number of milliseconds we hold a lock (not currently
       implemented) -->
       <attribute name="LockLeaseTimeout">60000</attribute>
      
       <!-- Name of the eviction policy class. Not supported now. -->
       <attribute name="EvictionPolicyClass"></attribute>
       </mbean>
      
      
      </server>