Treecache Lock Error
fmaredia Aug 29, 2005 1:15 PMSystem 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>