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https://issues.apache.org/jira/browse/AMQ-3160?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gary Tully resolved AMQ-3160.
-----------------------------
Resolution: Fixed
Fix Version/s: 5.5.0
sync added in r1063691
URL: http://svn.apache.org/viewvc?rev=1063691&view=rev
> ConcurrentModificationException in ActiveMQ Journal Checkpoint Worker
> ---------------------------------------------------------------------
>
> Key: AMQ-3160
> URL: https://issues.apache.org/jira/browse/AMQ-3160
> Project: ActiveMQ
> Issue Type: Bug
> Components: Message Store
> Affects Versions: 5.4.2
> Environment: CentOS 5.2
> Reporter: Craig Condit
> Assignee: Gary Tully
> Priority: Minor
> Fix For: 5.5.0
>
>
> There appears to be a race condition accessing Journal.getHashMap() from the
> ActiveMQ Journal Checkpoint Worker thread. Under high loads, we occasionally
> see the following exception in our logs:
> Exception in thread "ActiveMQ Journal Checkpoint Worker"
> java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
> at java.util.HashMap$EntryIterator.next(HashMap.java:834)
> at java.util.HashMap$EntryIterator.next(HashMap.java:832)
> at java.util.AbstractMap.putAll(AbstractMap.java:255)
> at java.util.TreeMap.putAll(TreeMap.java:304)
> at java.util.TreeMap.<init>(TreeMap.java:162)
> at org.apache.kahadb.journal.Journal.getFileMap(Journal.java:660)
> at
> org.apache.activemq.store.kahadb.MessageDatabase.checkpointUpdate(MessageDatabase.java:970)
> at
> org.apache.activemq.store.kahadb.MessageDatabase.access$400(MessageDatabase.java:82)
> at
> org.apache.activemq.store.kahadb.MessageDatabase$9.execute(MessageDatabase.java:599)
> at org.apache.kahadb.page.Transaction.execute(Transaction.java:728)
> at
> org.apache.activemq.store.kahadb.MessageDatabase.checkpointCleanup(MessageDatabase.java:597)
> at
> org.apache.activemq.store.kahadb.MessageDatabase$3.run(MessageDatabase.java:249)
> This leads to the thread aborting prematurely.
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