Gary Tully created AMQ-3999:
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Summary: Unsubscribing durable subs can be blocked on calls to
determine store size, contending with active subs
Key: AMQ-3999
URL: https://issues.apache.org/jira/browse/AMQ-3999
Project: ActiveMQ
Issue Type: Bug
Components: Broker
Affects Versions: 5.6.0
Reporter: Gary Tully
Assignee: Gary Tully
Fix For: 5.7.0
Here is the stack trace showing the thread that is making the call to the
getMessageCount when a sub is unsubscribing. This causes unnecessary contention
with message addition and can result is pauses. Is it really necessary?
{code}ActiveMQ Transport: tcp:///127.0.0.1:54115
sun.misc.Unsafe.park at line #-2
java.util.concurrent.locks.LockSupport.park at line #186
java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt at
line #834
java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued at line #867
java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire at line #1197
java.util.concurrent.locks.ReentrantReadWriteLock$WriteLock.lock at line #945
org.apache.activemq.store.kahadb.KahaDBStore$KahaDBTopicMessageStore.getMessageCount
at line #782
org.apache.activemq.store.ProxyTopicMessageStore.getMessageCount at line #116
org.apache.activemq.broker.region.cursors.TopicStorePrefetch.getStoreSize at
line #83
org.apache.activemq.broker.region.cursors.AbstractStoreCursor.resetSize at line
#66
org.apache.activemq.broker.region.cursors.AbstractStoreCursor.gc at line #246
org.apache.activemq.broker.region.cursors.StoreDurableSubscriberCursor.stop at
line #98
org.apache.activemq.broker.region.DurableTopicSubscription.deactivate at line
#171
org.apache.activemq.broker.region.TopicRegion.removeConsumer at line #164
org.apache.activemq.broker.region.RegionBroker.removeConsumer at line #473
org.apache.activemq.broker.jmx.ManagedRegionBroker.removeConsumer at line #266
org.apache.activemq.broker.BrokerFilter.removeConsumer at line #117
org.apache.activemq.broker.BrokerFilter.removeConsumer at line #117
org.apache.activemq.broker.MutableBrokerFilter.removeConsumer at line #123
org.apache.activemq.broker.TransportConnection.processRemoveConsumer at line
#580
org.apache.activemq.broker.TransportConnection.processRemoveSession at line #617
org.apache.activemq.command.RemoveInfo.visit at line #74
org.apache.activemq.broker.TransportConnection.service at line #291
org.apache.activemq.broker.TransportConnection$1.onCommand at line #149
org.apache.activemq.transport.MutexTransport.onCommand at line #50
org.apache.activemq.transport.WireFormatNegotiator.onCommand at line #113
org.apache.activemq.transport.AbstractInactivityMonitor.onCommand at line #229
org.apache.activemq.transport.TransportSupport.doConsume at line #83
org.apache.activemq.transport.tcp.TcpTransport.doRun at line #215
org.apache.activemq.transport.tcp.TcpTransport.run at line #197
java.lang.Thread.run at line #722{code}
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