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https://issues.apache.org/jira/browse/JCR-935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12528872
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Esteban Franqueiro commented on JCR-935:
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Hi Stefan.
Although I fully agree with you in that our workaround can cause deadlocks,
this didn't happen in our testing. All tests (jcr-tests, core tests, MT tests
and application level tests) pass.
Regarding the status of this issue, maybe for version 2 we can do something
better, but in the meantime we think these changes are a step forward. We will
work more on this issue as our knowledge of the core grows and allows us to dig
deeper. But for the time being we report our findings :)
Regards,
Esteban
> 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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