java.lang.IllegalStateException: Timer already cancelled caused by Exception in
thread "ActiveMQ Scheduler" java.util.ConcurrentModificationException and
----------------------------------------------------------------------------------------------------------------------------------------------------------
Key: AMQ-1727
URL: https://issues.apache.org/activemq/browse/AMQ-1727
Project: ActiveMQ
Issue Type: Bug
Components: Message Store
Affects Versions: 5.1.0
Reporter: Gary Tully
stack trace causes timer thread to abort:
Exception in thread "ActiveMQ Scheduler"
java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:841)
at java.util.HashMap$KeyIterator.next(HashMap.java:877)
at java.util.AbstractSet.removeAll(AbstractSet.java:143)
at
org.apache.activemq.kaha.impl.async.AsyncDataManager.consolidateDataFilesNotIn(AsyncDataManager.java:404)
at
org.apache.activemq.store.amq.AMQPersistenceAdapter.cleanup(AMQPersistenceAdapter.java:415)
at
org.apache.activemq.store.amq.AMQPersistenceAdapter$3.run(AMQPersistenceAdapter.java:267)
at org.apache.activemq.thread.SchedulerTimerTask.run(SchedulerTimerTask.java:33)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)
subsequent timer enqueue fails with:
java.lang.IllegalStateException: Timer already cancelled.
at java.util.Timer.sched(Timer.java:354)
at java.util.Timer.scheduleAtFixedRate(Timer.java:296)
at org.apache.activemq.thread.Scheduler.executePeriodically(Scheduler.java:38)
at
org.apache.activemq.kaha.impl.async.AsyncDataManager.start(AsyncDataManager.java:190)
at
org.apache.activemq.store.amq.AMQPersistenceAdapter.start(AMQPersistenceAdapter.java:207)
at
org.apache.activemq.broker.BrokerService.createRegionBroker(BrokerService.java:1597)
at
org.apache.activemq.broker.BrokerService.createBroker(BrokerService.java:1550)
at org.apache.activemq.broker.BrokerService.getBroker(BrokerService.java:560)
at org.apache.activemq.broker.BrokerService.start(BrokerService.java:455)
Problem identified in this diff, the inUse set needs to be copied as it may be
modified in parallel to the cleanup.
Index:
activemq-core/src/main/java/org/apache/activemq/store/amq/AMQPersistenceAdapter.java
===================================================================
---
activemq-core/src/main/java/org/apache/activemq/store/amq/AMQPersistenceAdapter.java
(revision 655936)
+++
activemq-core/src/main/java/org/apache/activemq/store/amq/AMQPersistenceAdapter.java
(working copy)
@@ -411,7 +411,7 @@
}
Integer lastDataFile = asyncDataManager.getCurrentDataFileId();
inProgress.add(lastDataFile);
- Set<Integer> inUse =
referenceStoreAdapter.getReferenceFileIdsInUse();
+ Set<Integer> inUse = new
HashSet<Integer>(referenceStoreAdapter.getReferenceFileIdsInUse());
asyncDataManager.consolidateDataFilesNotIn(inUse, inProgress);
} catch (IOException e) {
LOG.error("Could not cleanup data files: " + e, e);
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