6:08 a.m.
Hi!
I have a cluster with 2 load balanced back-end nodes. When using pessimistic locking my
cpu usage varies between 5-50% depending on load. I have tried to switch to optimistic
locking to improve concurrency, but after doing so my cpu usage skyrocketed to about 90%
on both nodes (small load - about 15% on pessimistic locking) and front-ends cant access
my back-ends. Is this normal?
My configuration file for optimistic locking:
<?xml version="1.0" encoding="UTF-8"?>
| <server>
| <mbean code="org.jboss.cache.TreeCache"
name="jboss.cache:service=TreeCache">
|
| <depends>jboss:service=Naming</depends>
| <depends>jboss:service=TransactionManager</depends>
| <attribute
name="TransactionManagerLookupClass">org.jboss.cache.GenericTransactionManagerLookup</attribute>
| <attribute name="NodeLockingScheme">OPTIMISTIC</attribute>
| <attribute name="IsolationLevel">READ_COMMITTED</attribute>
| <attribute name="CacheMode">REPL_ASYNC</attribute>
| <attribute name="SyncCommitPhase">false</attribute>
| <attribute name="SyncRollbackPhase">false</attribute>
| <attribute name="UseReplQueue">false</attribute>
| <attribute name="ReplQueueInterval">0</attribute>
| <attribute name="ReplQueueMaxElements">0</attribute>
| <attribute
name="EvictionPolicyClass">org.jboss.cache.eviction.LRUPolicy</attribute>
| <attribute name="EvictionPolicyConfig">
| <config>
| <attribute name="wakeUpIntervalSeconds">30</attribute>
| <region name="/_default_">
| <attribute name="maxNodes">50000</attribute>
| <attribute name="timeToLiveSeconds">0</attribute>
| <attribute name="maxAgeSeconds">0</attribute>
| </region>
| <region name="/templates">
| <attribute name="maxNodes">1000</attribute>
| <attribute name="timeToLiveSeconds">0</attribute>
| <attribute name="maxAgeSeconds">0</attribute>
| </region>
| <region name="/post">
| <attribute name="maxNodes">60000</attribute>
| <attribute name="timeToLiveSeconds">0</attribute>
| <attribute name="maxAgeSeconds">0</attribute>
| </region>
| <region name="/comment">
| <attribute name="maxNodes">60000</attribute>
| <attribute name="timeToLiveSeconds">0</attribute>
| <attribute name="maxAgeSeconds">0</attribute>
| </region>
| </config>
| </attribute>
|
| <attribute
name="LockParentForChildInsertRemove">true</attribute>
|
| <!--attribute name="FetchInMemoryState">false</attribute-->
| <attribute name="UseRegionBasedMarshalling">true</attribute>
| <attribute name="InactiveOnStartup">true</attribute>
| <attribute
name="InitialStateRetrievalTimeout">20000</attribute>
| <attribute name="SyncReplTimeout">20000</attribute>
| <attribute name="LockAcquisitionTimeout">15000</attribute>
|
| <attribute name="ClusterConfig">
| <config>
| <UDP mcast_recv_buf_size="500000" ip_mcast="true"
mcast_send_buf_size="32000"
| mcast_port="45501" ucast_recv_buf_size="500000"
use_incoming_packet_handler="false"
| mcast_addr="${jgroups.udp.mcast_addr:239.192.0.1}"
loopback="false" ucast_send_buf_size="32000"
ip_ttl="${jgroups.udp.ip_ttl:5}"/>
| <AUTOCONF/>
| <PING timeout="3000" num_initial_members="2"/>
| <MERGE2 max_interval="10000" min_interval="1000"/>
| <FD_SOCK/>
| <FD timeout="20000" max_tries="5"
shun="true"/>
| <VERIFY_SUSPECT timeout="1500"/>
| <pbcast.NAKACK use_mcast_xmit="true" gc_lag="100"
retransmit_timeout="1200,2400,4800"/>
| <UNICAST timeout="600,1200,2400"/>
| <pbcast.STABLE desired_avg_gossip="20000"/>
| <FRAG2 frag_size="8192"/>
| <pbcast.GMS print_local_addr="false" join_timeout="5000"
join_retry_timeout="2000" shun="true"/>
| <pbcast.STATE_TRANSFER/>
| </config>
| </attribute>
|
| </mbean>
| </server>
Exceptions:
2007-09-07 12:11:12,283 WARN [com.arjuna.ats.arjuna.logging.arjLoggerI18N]
[com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator_2]
TwoPhaseCoordinator.beforeCompletion - failed for
com.arjuna.ats.internal.jta.resources.arjunacore.SynchronizationImple@69b7c5
| java.lang.RuntimeException:
| Caused by: org.jboss.cache.optimistic.DataVersioningException: Tx attempted to create
/s/sr#11531990 anew. It has already been created since this tx started by another
(possibly remote) tx.
2007-09-07 12:11:12,232 WARN [org.jboss.cache.interceptors.TxInterceptor] Roll back
failed encountered
| java.lang.IllegalStateException: BaseTransaction.rollback -
[com.arjuna.ats.internal.jta.transaction.arjunacore.notx]
[com.arjuna.ats.internal.jta.transaction.arjunacore.notx] no transaction!
2007-09-07 11:58:53,790 WARN [org.jboss.cache.interceptors.TxInterceptor] Rolling back,
exception encountered
| javax.transaction.RollbackException:
[com.arjuna.ats.internal.jta.transaction.arjunacore.commitwhenaborted]
[com.arjuna.ats.internal.jta.transaction.arjunacore.commitwhenaborted] Can't commit
because the transaction is in aborted state
| Caused by: java.lang.RuntimeException:
| at
org.jboss.cache.interceptors.TxInterceptor$LocalSynchronizationHandler.beforeCompletion(Unknown
Source)
| at
org.jboss.cache.interceptors.OrderedSynchronizationHandler.beforeCompletion(Unknown
Source)
| at
com.arjuna.ats.internal.jta.resources.arjunacore.SynchronizationImple.beforeCompletion(SynchronizationImple.java:114)
| at
com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.beforeCompletion(TwoPhaseCoordinator.java:247)
| at
com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.end(TwoPhaseCoordinator.java:86)
| at com.arjuna.ats.arjuna.AtomicAction.commit(AtomicAction.java:177)
| at
com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1382)
| ... 68 more
| Caused by: org.jboss.cache.optimistic.DataVersioningException: Tx attempted to create
/s/sr#11719693 anew. It has already been created since this tx started by another
(possibly remote) tx.
| at org.jboss.cache.interceptors.OptimisticValidatorInterceptor.simpleValidate(Unknown
Source)
| at org.jboss.cache.interceptors.OptimisticValidatorInterceptor.validateNodes(Unknown
Source)
| at org.jboss.cache.interceptors.OptimisticValidatorInterceptor.invoke(Unknown
Source)
| at org.jboss.cache.interceptors.Interceptor.invoke(Unknown Source)
| at org.jboss.cache.interceptors.OptimisticLockingInterceptor.invoke(Unknown Source)
| at org.jboss.cache.interceptors.Interceptor.invoke(Unknown Source)
| at org.jboss.cache.interceptors.OptimisticReplicationInterceptor.invoke(Unknown
Source)
| at org.jboss.cache.interceptors.Interceptor.invoke(Unknown Source)
| at org.jboss.cache.interceptors.TxInterceptor.runPreparePhase(Unknown Source)
| ... 75 more
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