[jboss-user] [JBossCache] - IdentityLock timeouts occuring after 0 ms and no locks?

timferro do-not-reply at jboss.com
Tue Apr 3 13:02:23 EDT 2007


We have a jboss cluster with a Hibernate 2nd level cache via JBossCache.  I'm receiving a lot of the following type of error and I'm unsure how to approach resolving it.  It seems like the write lock times out instantly, but there aren't any existing locks:

[IdentityLock] write lock for ... could not be acquired after 0 ms. Locks: Read lock owners: [] Write lock owner: null  (caller=Thread[http-0.0.0.0-8443-30], lock info:  (org.jboss.cache.lock.LockStrategyReadCommitted at 75fae343))

JBoss version is 4.0.5 GA, JGroups & JBossCache are the versions that shipped with it.

I have included our cache configuration file in case anything can be seen as obviously wrong therein:  

<?xml version="1.0" encoding="UTF-8"?>

    

        jboss:service=Naming
        jboss:service=TransactionManager

        Hibernate-${jboss.partition.name:Cluster}
        READ_COMMITTED
        REPL_ASYNC

        false
        false
   
        org.jboss.cache.BatchModeTransactionManagerLookup

        
            
                <UDP mcast_addr="${partition.udpgroup.hib3:228.1.2.3}" 
                     mcast_port="${partition.udpport.hib3:48866}"
                     ucast_recv_buf_size="20000000"
                     ucast_send_buf_size="640000"
                     mcast_recv_buf_size="25000000" 
                     mcast_send_buf_size="640000" 
                     loopback="false" 
                     max_bundle_size="64000" 
                     max_bundle_timeout="30" 
                     use_incoming_packet_handler="true" 
                     use_outgoing_packet_handler="true" 
                     ip_ttl="${jgroups.mcast.ip_ttl:2}" 
                     enable_bundling="true"/>
                <PING timeout="2000"
                      down_thread="false" num_initial_members="3"/>
                <MERGE2 max_interval="100000"
                        down_thread="false" min_interval="20000"/>
                <FD_SOCK down_thread="false" />
                <FD shun="true" down_thread="false"
                        timeout="20000" max_tries="5"/>
                <VERIFY_SUSPECT timeout="1500"
                        down_thread="false"/>
                <pbcast.NAKACK max_xmit_size="60000"
                               use_mcast_xmit="false" gc_lag="50" 
                               retransmit_timeout="300,600,1200,2400,4800" 
                               down_thread="false" 
                               discard_delivered_msgs="true"/>
                <UNICAST timeout="300,600,1200,2400,3600" 
                         down_thread="false" />
                <pbcast.STABLE stability_delay="1000" desired_avg_gossip="50000" 
                               down_thread="false" 
                               max_bytes="400000"/>
                <pbcast.GMS print_local_addr="true" join_timeout="3000" 
                            down_thread="false" 
                            join_retry_timeout="2000" shun="true"/>
                <FC max_credits="2000000" down_thread="false" 
                    min_threshold="0.10"/>
                <FRAG2 frag_size="60000" down_thread="false" up_thread="true"/>
                <pbcast.STATE_TRANSFER down_thread="false" up_thread="false"/>
           

        

        false
        20000
        20000

        15000

        
            
                false
                org.jboss.cache.buddyreplication.NextMemberBuddyLocator
                
                    numBuddies = 1
                    ignoreColocatedBuddies = true
                

                default
                2000

                false
                true
                true

            
        
		   
    




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