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From "Claudio Tagliola (Issue Comment Edited) (JIRA)" <j...@apache.org>
Subject [jira] [Issue Comment Edited] (AMQ-3755) receiveNoWait blocked on same mutex as sending threads
Date Tue, 06 Mar 2012 14:57:57 GMT

    [ https://issues.apache.org/jira/browse/AMQ-3755?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13223149#comment-13223149
] 

Claudio Tagliola edited comment on AMQ-3755 at 3/6/12 2:56 PM:
---------------------------------------------------------------

We had a hunch we had to move to a multiple VMTransport implementation, however, I have some
follow-up questions:

>From the documentation it is not clear what the limitations of the VMTransport exactly
are, it talks about a JMS Client, but that is a bit of a vague notion inside the same JVM.
It seems, one of the effects of this limitation is that the receiveNoWait call will start
blocking, which is not obvious from the documentation.

Furthermore, if we move to multiple VMTransports, will the backed up broker be able to continue
without blocking or will the bottleneck then surface inside the broker?

It will take some time to get this modified and get it deployed in our production environment.
                
      was (Author: tagliola):
    We had a hunch we had to move to a multiple VMTransport implementation, however, I have
some follow-up questions:

>From the documentation it is not clear what the limitations of the VMTransport exactly
are, it talks about a JMS Client, but that is a bit of a vague notion inside the same JVM.
It seems, one of the effects of this limitation is that the receiveNoWait call will start
blocking, which is not obvious from the documentation.

Furthermore, if we move to multiple VMTransports, will the backup broker be able to continue
without blocking or will the bottleneck then surface inside the broker?

It will take some time to get this modified and get it deployed in our production environment.
                  
> receiveNoWait blocked on same mutex as sending threads
> ------------------------------------------------------
>
>                 Key: AMQ-3755
>                 URL: https://issues.apache.org/jira/browse/AMQ-3755
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.5.0
>            Reporter: Claudio Tagliola
>
> We have a server processing requests with an internal broker, connected with a vm transport.
At a certain load and a high number of clients (approx. 350 clients) we see our server congested
towards the internal VM broker. By looking at the stacktraces, it seems the incoming reading
thread is waiting for a lock obtained by one of several other threads. This resulted in a
short period (around 20-30 seconds) of very sluggish response times towards our clients. Response
times of _any_ request through ActiveMQ go from a normal <50ms response time towards 2
seconds.
> Below is an extract of a stackdump while this happened. The first stacktrace is the thread
trying to read incoming messages with a receiveNoWait, but it is blocked by the first thread,
which the second thread owns. The third and fourth are two other processes, all waiting for
the same mutex. These four processes are - from our server's perspective - not related to
each other:
> {noformat}
> "RoundRobinReceiver" prio=10 tid=0x00007f1030483800 nid=0x2a59 waiting for monitor entry
[0x00007f1075f5b000]
>    java.lang.Thread.State: BLOCKED (on object monitor)
> 	at org.apache.activemq.transport.MutexTransport.oneway(MutexTransport.java:39)
> 	- waiting to lock <0x00000006bb6028b0> (a java.lang.Object)
> 	at org.apache.activemq.transport.ResponseCorrelator.oneway(ResponseCorrelator.java:60)
> 	at org.apache.activemq.ActiveMQConnection.doAsyncSendPacket(ActiveMQConnection.java:1265)
> 	at org.apache.activemq.ActiveMQConnection.asyncSendPacket(ActiveMQConnection.java:1259)
> 	at org.apache.activemq.ActiveMQSession.asyncSendPacket(ActiveMQSession.java:1863)
> 	at org.apache.activemq.ActiveMQSession.sendAck(ActiveMQSession.java:2029)
> 	at org.apache.activemq.ActiveMQSession.sendAck(ActiveMQSession.java:2024)
> 	at org.apache.activemq.ActiveMQMessageConsumer.afterMessageIsConsumed(ActiveMQMessageConsumer.java:871)
> 	- locked <0x0000000715bda898> (a java.util.LinkedList)
> 	at org.apache.activemq.ActiveMQMessageConsumer.receiveNoWait(ActiveMQMessageConsumer.java:617)
> 	at com.foo.bar.impl.server.services.jms.JMSRoundRobinListener.readFromConsumer(JMSRoundRobinListener.java:200)
> 	at com.foo.bar.impl.server.services.jms.JMSRoundRobinListener.roundRobinOverQueueConsumers(JMSRoundRobinListener.java:173)
> 	at com.foo.bar.impl.server.services.jms.JMSRoundRobinListener.receiveMessagesUntilInterrupt(JMSRoundRobinListener.java:109)
> 	at com.foo.bar.impl.server.services.jms.JMSRoundRobinListener.access$200(JMSRoundRobinListener.java:22)
> 	at com.foo.bar.impl.server.services.jms.JMSRoundRobinListener$RoundRobinReceiver.run(JMSRoundRobinListener.java:248)
> 	at java.lang.Thread.run(Thread.java:722)
> "ResultPublisher1" prio=10 tid=0x00007f0f20003000 nid=0x2b31 waiting on condition [0x00007f1060d59000]
>    java.lang.Thread.State: WAITING (parking)
> 	at sun.misc.Unsafe.park(Native Method)
> 	- parking to wait for  <0x00000006bb600410> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
> 	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
> 	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043)
> 	at java.util.concurrent.LinkedBlockingQueue.put(LinkedBlockingQueue.java:349)
> 	at org.apache.activemq.transport.vm.VMTransport.oneway(VMTransport.java:94)
> 	at org.apache.activemq.transport.MutexTransport.oneway(MutexTransport.java:40)
> 	- locked <0x00000006bb6028b0> (a java.lang.Object)
> 	at org.apache.activemq.transport.ResponseCorrelator.oneway(ResponseCorrelator.java:60)
> 	at org.apache.activemq.ActiveMQConnection.doAsyncSendPacket(ActiveMQConnection.java:1265)
> 	at org.apache.activemq.ActiveMQConnection.asyncSendPacket(ActiveMQConnection.java:1259)
> 	at org.apache.activemq.ActiveMQSession.send(ActiveMQSession.java:1744)
> 	- locked <0x00000006bc4bd448> (a java.lang.Object)
> 	at org.apache.activemq.ActiveMQMessageProducer.send(ActiveMQMessageProducer.java:231)
> 	at org.apache.activemq.ActiveMQMessageProducerSupport.send(ActiveMQMessageProducerSupport.java:241)
> 	at com.foo.bar.impl.server.services.jms.MappingResultPublisher.publishResponse(MappingResultPublisher.java:66)
> 	at com.foo.bar.impl.server.services.jms.QueuedMappingResultPublisher.executeJob(QueuedMappingResultPublisher.java:44)
> 	at com.foo.bar.impl.server.services.mapper.AbstractQueuedMappingJobExecutor.processJob(AbstractQueuedMappingJobExecutor.java:120)
> 	at com.foo.bar.impl.server.services.mapper.AbstractQueuedMappingJobExecutor.access$100(AbstractQueuedMappingJobExecutor.java:23)
> 	at com.foo.bar.impl.server.services.mapper.AbstractQueuedMappingJobExecutor$1.run(AbstractQueuedMappingJobExecutor.java:105)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
> 	at java.lang.Thread.run(Thread.java:722)
> "RemoteResolveRequestService-ReplierThread-1" prio=10 tid=0x00007f1030485000 nid=0x2a5a
waiting for monitor entry [0x00007f1075e5a000]
>    java.lang.Thread.State: BLOCKED (on object monitor)
> 	at org.apache.activemq.transport.MutexTransport.oneway(MutexTransport.java:39)
> 	- waiting to lock <0x00000006bb6028b0> (a java.lang.Object)
> 	at org.apache.activemq.transport.ResponseCorrelator.oneway(ResponseCorrelator.java:60)
> 	at org.apache.activemq.ActiveMQConnection.doAsyncSendPacket(ActiveMQConnection.java:1265)
> 	at org.apache.activemq.ActiveMQConnection.asyncSendPacket(ActiveMQConnection.java:1259)
> 	at org.apache.activemq.ActiveMQSession.send(ActiveMQSession.java:1744)
> 	- locked <0x00000006baf131f8> (a java.lang.Object)
> 	at org.apache.activemq.ActiveMQMessageProducer.send(ActiveMQMessageProducer.java:231)
> 	at org.apache.activemq.ActiveMQMessageProducerSupport.send(ActiveMQMessageProducerSupport.java:300)
> 	at com.foo.bar.remoteservices.server.RpcReplierTask.sendReply(RpcReplierTask.java:129)
> 	at com.foo.bar.remoteservices.server.RpcReplierTask.run(RpcReplierTask.java:103)
> 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> 	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
> 	at java.util.concurrent.FutureTask.run(FutureTask.java:166)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
> 	at java.lang.Thread.run(Thread.java:722)
> "PersistEntityMessagePublisherThread" daemon prio=10 tid=0x00007f1030b70800 nid=0x2a4b
waiting for monitor entry [0x00007f1076c68000]
>    java.lang.Thread.State: BLOCKED (on object monitor)
> 	at org.apache.activemq.transport.MutexTransport.oneway(MutexTransport.java:39)
> 	- waiting to lock <0x00000006bb6028b0> (a java.lang.Object)
> 	at org.apache.activemq.transport.ResponseCorrelator.oneway(ResponseCorrelator.java:60)
> 	at org.apache.activemq.ActiveMQConnection.doAsyncSendPacket(ActiveMQConnection.java:1265)
> 	at org.apache.activemq.ActiveMQConnection.asyncSendPacket(ActiveMQConnection.java:1259)
> 	at org.apache.activemq.ActiveMQSession.send(ActiveMQSession.java:1744)
> 	- locked <0x00000006bc542e90> (a java.lang.Object)
> 	at org.apache.activemq.ActiveMQMessageProducer.send(ActiveMQMessageProducer.java:231)
> 	at org.apache.activemq.ActiveMQMessageProducerSupport.send(ActiveMQMessageProducerSupport.java:241)
> 	at com.foo.bar.impl.server.services.PersistEntityMessageBackgroundPublisher.sendMessage(PersistEntityMessageBackgroundPublisher.java:140)
> 	at com.foo.bar.impl.server.services.PersistEntityMessageBackgroundPublisher.sendMessage(PersistEntityMessageBackgroundPublisher.java:132)
> 	at com.foo.bar.impl.server.services.PersistEntityMessageBackgroundPublisher.forwardMessagesToTopic(PersistEntityMessageBackgroundPublisher.java:101)
> 	at com.foo.bar.impl.server.services.PersistEntityMessageBackgroundPublisher.access$000(PersistEntityMessageBackgroundPublisher.java:22)
> 	at com.foo.bar.impl.server.services.PersistEntityMessageBackgroundPublisher$1.run(PersistEntityMessageBackgroundPublisher.java:49)
> 	at java.lang.Thread.run(Thread.java:722)
> {noformat}
> My question is: why is the receiving of messages blocked by the other threads and why
do they share a single mutex? Is there anything I can do to alleviate this problem?

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