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From "Pablo Rios (JIRA)" <j...@apache.org>
Subject [jira] Created: (JCR-935) ConcurrentModificationException during logout (cont'd)
Date Mon, 21 May 2007 18:57:16 GMT
ConcurrentModificationException during logout (cont'd)
------------------------------------------------------

                 Key: JCR-935
                 URL: https://issues.apache.org/jira/browse/JCR-935
             Project: Jackrabbit
          Issue Type: Bug
          Components: core
    Affects Versions: 1.3
            Reporter: Pablo Rios


I "seldom" get a CME running ConcurrentReadWriteTest.testReadWrite test.

Following are different stack traces of two runs:
 
Exception in thread "Thread-9" java.util.ConcurrentModificationException
 at org.apache.commons.collections.map.AbstractReferenceMap$ReferenceEntrySetIterator.checkMod(AbstractReferenceMap.java:761)
 at org.apache.commons.collections.map.AbstractReferenceMap$ReferenceEntrySetIterator.hasNext(AbstractReferenceMap.java:735)
 at org.apache.commons.collections.map.AbstractReferenceMap$ReferenceValues.toArray(AbstractReferenceMap.java:543)
 at java.util.Collections$UnmodifiableCollection.toArray(Unknown Source)
 at java.util.Collections$UnmodifiableCollection.toArray(Unknown Source)
 at org.apache.jackrabbit.core.state.LocalItemStateManager.dispose(LocalItemStateManager.java:341)
 at org.apache.jackrabbit.core.state.SessionItemStateManager.dispose(SessionItemStateManager.java:316)
 at org.apache.jackrabbit.core.SessionImpl.logout(SessionImpl.java:1269)
 at org.apache.jackrabbit.core.XASessionImpl.logout(XASessionImpl.java:379)
 at org.apache.jackrabbit.core.AbstractConcurrencyTest$Executor.run(AbstractConcurrencyTest.java:114)
 at java.lang.Thread.run(Unknown Source)


Exception in thread "Thread-9" java.util.ConcurrentModificationException
	at org.apache.commons.collections.map.AbstractReferenceMap$ReferenceEntrySetIterator.checkMod(AbstractReferenceMap.java:761)
	at org.apache.commons.collections.map.AbstractReferenceMap$ReferenceEntrySetIterator.nextEntry(AbstractReferenceMap.java:770)
	at org.apache.commons.collections.map.AbstractReferenceMap$ReferenceValuesIterator.next(AbstractReferenceMap.java:829)
	at org.apache.commons.collections.map.AbstractReferenceMap$ReferenceValues.toArray(AbstractReferenceMap.java:544)
	at java.util.Collections$UnmodifiableCollection.toArray(Unknown Source)
	at java.util.Collections$UnmodifiableCollection.toArray(Unknown Source)
	at org.apache.jackrabbit.core.state.LocalItemStateManager.dispose(LocalItemStateManager.java:341)
	at org.apache.jackrabbit.core.state.SessionItemStateManager.dispose(SessionItemStateManager.java:316)
	at org.apache.jackrabbit.core.SessionImpl.logout(SessionImpl.java:1269)
	at org.apache.jackrabbit.core.XASessionImpl.logout(XASessionImpl.java:379)
	at org.apache.jackrabbit.core.AbstractConcurrencyTest$Executor.run(AbstractConcurrencyTest.java:114)
	at java.lang.Thread.run(Unknown Source)

My working copy is revision 538918 with both JCR-314 patches applied, using FineGrainedISMLocking
strategy.
I run this test manually from within Eclipse 3.2.1 / JRE 1.5.0_10-b03.

The workstation were I run this test has an Intel Dual-Core Xeon 5130 2 GHz. To able to compare
this CPU with another, with the default params of this test (NUM_NODES = 5, NUM_THREADS =
5, RUN_NUM_SECONDS = 20), the number of operations are ~ #writes performed: 300-400, #reads
performed: 4700000 - 4900000.

Regards,
Pablo


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