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1. Re: IdentityLock exception while using JBossCache and Hibern
manik Nov 28, 2005 6:17 AM (in response to jaikiran)yes, in that it may mean that hung threads could attempt to wait for locks for quite a long time (effectively hanging your app) waiting for a lock if you are in a deadlock condition.
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2. Re: IdentityLock exception while using JBossCache and Hibern
jaikiran Nov 28, 2005 7:03 AM (in response to jaikiran)Thanks Manik. That answers my question.
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3. Re: IdentityLock exception while using JBossCache and Hibern
alesj Nov 28, 2005 9:20 AM (in response to jaikiran)I'm using cache with EJB3 (Hibernate3.1). All pojos used have 'transactional' cache concurrency strategy.
I also get the following exception:
15:16:06,359 ERROR [IdentityLock] read lock for /mediumTime could not be acquired by Thread[http-0.0.0.0-8080-3,5,jboss] after 0 ms. Locks: Read lock owners: {}
Write lock owner: GlobalTransaction::15
, lock info: write owner=GlobalTransaction::15 (activeReaders=0, activeWriter=Thread[http-0.0.0.0-8080-3,5,jboss], waitingReaders=0, waitingWriters=0, waitingUpgrader=0)
15:16:06,359 ERROR [IdentityLock] read lock for /mediumTime could not be acquired by Thread[http-0.0.0.0-8080-3,5,jboss] after 0 ms. Locks: Read lock owners: {}
Write lock owner: GlobalTransaction::15
, lock info: write owner=GlobalTransaction::15 (activeReaders=0, activeWriter=Thread[http-0.0.0.0-8080-3,5,jboss], waitingReaders=0, waitingWriters=0, waitingUpgrader=0)
15:16:06,375 ERROR [IdentityLock] read lock for /mediumTime could not be acquired by Thread[http-0.0.0.0-8080-3,5,jboss] after 0 ms. Locks: Read lock owners: {}
Write lock owner: GlobalTransaction::15
, lock info: write owner=GlobalTransaction::15 (activeReaders=0, activeWriter=Thread[http-0.0.0.0-8080-3,5,jboss], waitingReaders=0, waitingWriters=0, waitingUpgrader=0)
15:16:06,421 ERROR [IdentityLock] read lock for /mediumTime could not be acquired by Thread[http-0.0.0.0-8080-3,5,jboss] after 0 ms. Locks: Read lock owners: {}
Write lock owner: GlobalTransaction::15
, lock info: write owner=GlobalTransaction::15 (activeReaders=0, activeWriter=Thread[http-0.0.0.0-8080-3,5,jboss], waitingReaders=0, waitingWriters=0, waitingUpgrader=0)
15:16:06,421 ERROR [IdentityLock] read lock for /mediumTime could not be acquired by Thread[http-0.0.0.0-8080-3,5,jboss] after 0 ms. Locks: Read lock owners: {}
Write lock owner: GlobalTransaction::15
, lock info: write owner=GlobalTransaction::15 (activeReaders=0, activeWriter=Thread[http-0.0.0.0-8080-3,5,jboss], waitingReaders=0, waitingWriters=0, waitingUpgrader=0)
15:16:06,437 ERROR [IdentityLock] read lock for /mediumTime could not be acquired by Thread[http-0.0.0.0-8080-3,5,jboss] after 0 ms. Locks: Read lock owners: {}
Write lock owner: GlobalTransaction::15
, lock info: write owner=GlobalTransaction::15 (activeReaders=0, activeWriter=Thread[http-0.0.0.0-8080-3,5,jboss], waitingReaders=0, waitingWriters=0, waitingUpgrader=0)
15:16:06,453 ERROR [IdentityLock] read lock for /mediumTime could not be acquired by Thread[http-0.0.0.0-8080-3,5,jboss] after 0 ms. Locks: Read lock owners: {}
Write lock owner: GlobalTransaction::15
, lock info: write owner=GlobalTransaction::15 (activeReaders=0, activeWriter=Thread[http-0.0.0.0-8080-3,5,jboss], waitingReaders=0, waitingWriters=0, waitingUpgrader=0)
15:16:06,468 ERROR [IdentityLock] read lock for /mediumTime could not be acquired by Thread[http-0.0.0.0-8080-3,5,jboss] after 0 ms. Locks: Read lock owners: {}
Write lock owner: GlobalTransaction::15
, lock info: write owner=GlobalTransaction::15 (activeReaders=0, activeWriter=Thread[http-0.0.0.0-8080-3,5,jboss], waitingReaders=0, waitingWriters=0, waitingUpgrader=0)
15:16:06,500 ERROR [IdentityLock] read lock for /mediumTime could not be acquired by Thread[http-0.0.0.0-8080-3,5,jboss] after 0 ms. Locks: Read lock owners: {}
Write lock owner: GlobalTransaction::15
, lock info: write owner=GlobalTransaction::15 (activeReaders=0, activeWriter=Thread[http-0.0.0.0-8080-3,5,jboss], waitingReaders=0, waitingWriters=0, waitingUpgrader=0)
15:16:06,500 ERROR [IdentityLock] read lock for /mediumTime could not be acquired by Thread[http-0.0.0.0-8080-3,5,jboss] after 0 ms. Locks: Read lock owners: {}
Write lock owner: GlobalTransaction::15
, lock info: write owner=GlobalTransaction::15 (activeReaders=0, activeWriter=Thread[http-0.0.0.0-8080-3,5,jboss], waitingReaders=0, waitingWriters=0, waitingUpgrader=0)
15:16:06,578 ERROR [IdentityLock] read lock for /mediumTime could not be acquired by Thread[http-0.0.0.0-8080-3,5,jboss] after 0 ms. Locks: Read lock owners: {}
Write lock owner: GlobalTransaction::15
, lock info: write owner=GlobalTransaction::15 (activeReaders=0, activeWriter=Thread[http-0.0.0.0-8080-3,5,jboss], waitingReaders=0, waitingWriters=0, waitingUpgrader=0)
This is my cache mbean service file:<?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=EJB3TreeCache"> <depends>jboss:service=Naming</depends> <depends>jboss:service=TransactionManager</depends> <!-- Configure the TransactionManager --> <attribute name="TransactionManagerLookupClass">org.jboss.cache.JBossTransactionManagerLookup</attribute> <!-- Node locking 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="228.1.2.5" 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" 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> <!-- 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> <!-- Name of the eviction policy class. Not supported now. --> <attribute name="EvictionPolicyClass">org.jboss.cache.eviction.LRUPolicy</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> <!-- Maximum time an object is kept in cache regardless of idle time; time from last change or visit and attribut must exist --> <attribute name="timeToLiveSeconds">3600</attribute> <attribute name="maxAgeSeconds">3600</attribute> </region> <!-- Cached objects --> <region name="/content"> <attribute name="maxNodes">300</attribute> <attribute name="timeToLiveSeconds">0</attribute> </region> <region name="/contentToMany"> <attribute name="maxNodes">1000</attribute> <attribute name="timeToLiveSeconds">0</attribute> </region> <region name="/pubCompParagraph"> <attribute name="maxNodes">300</attribute> <attribute name="timeToLiveSeconds">0</attribute> </region> <region name="/source"> <attribute name="maxNodes">20</attribute> <attribute name="timeToLiveSeconds">0</attribute> </region> <region name="/sourceExtra"> <attribute name="maxNodes">100</attribute> <attribute name="timeToLiveSeconds">0</attribute> </region> <region name="/category"> <attribute name="maxNodes">10</attribute> <attribute name="timeToLiveSeconds">0</attribute> </region> <region name="/topic"> <attribute name="maxNodes">50</attribute> <attribute name="timeToLiveSeconds">0</attribute> </region> <region name="/banner"> <attribute name="maxNodes">20</attribute> <attribute name="timeToLiveSeconds">0</attribute> <attribute name="maxAgeSeconds">600</attribute> </region> <region name="/keyword"> <attribute name="maxNodes">200</attribute> <attribute name="timeToLiveSeconds">0</attribute> </region> <!-- words and meanings --> <region name="/lexicon"> <attribute name="maxNodes">200</attribute> <attribute name="timeToLiveSeconds">0</attribute> </region> <!-- END cached objects --> <!-- Cached queries --> <region name="/final"> <attribute name="maxNodes">10</attribute> <attribute name="timeToLiveSeconds">0</attribute> </region> <region name="/navigation"> <attribute name="maxNodes">500</attribute> <attribute name="timeToLiveSeconds">0</attribute> </region> <region name="/lastCategoryContent"> <attribute name="maxNodes">50</attribute> <attribute name="timeToLiveSeconds">0</attribute> </region> <region name="/related"> <attribute name="maxNodes">200</attribute> <attribute name="timeToLiveSeconds">0</attribute> </region> <region name="/moreContent"> <attribute name="maxNodes">200</attribute> <attribute name="timeToLiveSeconds">0</attribute> </region> <!-- END cached queries --> <!-- START timed cached --> <region name="/longTime"> <attribute name="maxNodes">200</attribute> <attribute name="timeToLiveSeconds">0</attribute> <attribute name="maxAgeSeconds">86400</attribute> <!-- one day --> </region> <region name="/mediumTime"> <attribute name="maxNodes">200</attribute> <attribute name="timeToLiveSeconds">0</attribute> <attribute name="maxAgeSeconds">3600</attribute> <!-- one hour --> </region> <region name="/shortTime"> <attribute name="maxNodes">200</attribute> <attribute name="timeToLiveSeconds">0</attribute> <attribute name="maxAgeSeconds">600</attribute> <!-- 10 min --> </region> <!-- END timed cached --> </config> </attribute> </mbean> </server>