ConcurrentModificationException in ActiveMQ Journal Checkpoint Worker
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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
Priority: Minor
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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