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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