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From Eric-AWL <eric.vinc...@atosorigin.com>
Subject CountDownLatch problem . MultiCast Discovery and refusal of connection on DUPLEX connection (Fuse 5.3.0.5) .
Date Tue, 06 Jul 2010 09:15:56 GMT

Hi

I'm sure that I identified a Latch problem in Multicast Network Discovery
mechanism on Duplex connection

The multicast notifier thread is blocked. here the trace

"Notifier-MulticastDiscoveryAgent-listener:DiscoveryNetworkConnector:NOCSupervisorP5-ADMIN-OUT-IN:BrokerService[SIBBusModule-NOCP5-tpnocp08s-bus]"
daemon prio=10 tid=0x0000000044ff2400 nid=0x1389 waiting on condition
[0x0000000044c26000..0x0000000044c26b90]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00002aaab3dd66f0> (a
java.util.concurrent.CountDownLatch$Sync)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
	at
java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:747)
	at
java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:905)
	at
java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1217)
	at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:207)
	at
org.apache.activemq.network.DemandForwardingBridgeSupport.start(DemandForwardingBridgeSupport.java:231)
	at
org.apache.activemq.network.DiscoveryNetworkConnector.onServiceAdd(DiscoveryNetworkConnector.java:114)
	at
org.apache.activemq.transport.discovery.multicast.MulticastDiscoveryAgent$2.run(MulticastDiscoveryAgent.java:484)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:619)

The problem appears when the network is quickly and alternatively on/off
between the two components.
The bridge is created in one direction, but the answer can not be received.

The thread is blocked on the CountDownLatch. Even if multicast frames are
received, the component can not establish a new network connection.

Here are an corresponding activemq trace 

When it is OK :
2010-06-22 22:56:24,500 [-tpnocp08s-bus]] INFO  DiscoveryNetworkConnector     
- Establishing network connection from vm://SIBBusModule-NOCP5-tpnocp08s-bus
to tcp://tpnocp11v-bus.vdm.priv.amm.noc:14101?useLocalHost=false
2010-06-22 22:56:26,083 [nocp08s-bus#160] INFO  DemandForwardingBridge        
- Network connection between vm://SIBBusModule-NOCP5-tpnocp08s-bus#160 and
tcp://tpnocp11v-bus.vdm.priv.amm.noc/10.18.126.30:14101(SIBBusSupervisor-tpnocp11v-bus)
has been established.

2010-06-22 22:57:34,807 [-tpnocp08s-bus]] INFO  DemandForwardingBridge        
- SIBBusModule-NOCP5-tpnocp08s-bus bridge to SIBBusSupervisor-tpnocp11v-bus
stopped

2010-06-22 22:57:34,811 [-tpnocp08s-bus]] INFO  DiscoveryNetworkConnector     
- Establishing network connection from vm://SIBBusModule-NOCP5-tpnocp08s-bus
to tcp://tpnocp11v-bus.vdm.priv.amm.noc:14101?useLocalHost=false
2010-06-22 22:57:39,064 [nocp08s-bus#162] INFO  DemandForwardingBridge        
- Network connection between vm://SIBBusModule-NOCP5-tpnocp08s-bus#162 and
tcp://tpnocp11v-bus.vdm.priv.amm.noc/10.18.126.30:14101(SIBBusSupervisor-tpnocp11v-bus)
has been established.

2010-06-22 22:58:42,578 [-tpnocp08s-bus]] INFO  DemandForwardingBridge        
- SIBBusModule-NOCP5-tpnocp08s-bus bridge to SIBBusSupervisor-tpnocp11v-bus
stopped

When it is KO : "Unknown" 

2010-06-22 22:58:42,648 [-tpnocp08s-bus]] INFO  DiscoveryNetworkConnector     
- Establishing network connection from vm://SIBBusModule-NOCP5-tpnocp08s-bus
to tcp://tpnocp11v-bus.vdm.priv.amm.noc:14101?useLocalHost=false
2010-06-22 22:59:18,031 [18.126.30:14101] WARN  DemandForwardingBridge        
- Network connection between vm://SIBBusModule-NOCP5-tpnocp08s-bus#164 and
tcp://tpnocp11v-bus.vdm.priv.amm.noc/10.18.126.30:14101 shutdown due to a
remote error: java.net.SocketException: Connection reset
2010-06-22 22:59:18,033 [NetworkBridge  ] INFO  DemandForwardingBridge        
- SIBBusModule-NOCP5-tpnocp08s-bus bridge to Unknown stopped


Here is the other side corresponding activemq trace 

activemq-server.log:2010-06-22 22:55:44,295 [26.190.27:40517] INFO 
TransportConnection            - Created Duplex Bridge back to
SIBBusModule-NOCP5-tpnocp08s-bus

activemq-server.log:2010-06-22 22:56:24,438 [26.190.27:40517] INFO 
DemandForwardingBridge         - SIBBusSupervisor-tpnocp11v-bus bridge to
SIBBusModule-NOCP5-tpnocp08s-bus stopped

activemq-server.log:2010-06-22 22:56:26,135 [26.190.27:40518] INFO 
TransportConnection            - Created Duplex Bridge back to
SIBBusModule-NOCP5-tpnocp08s-bus
activemq-server.log:2010-06-22 22:56:26,135 [ocp11v-bus#1770] INFO 
DemandForwardingBridge         - Network connection between
vm://SIBBusSupervisor-tpnocp11v-bus#1770 and
tcp:///10.26.190.27:40518(SIBBusModule-NOCP5-tpnocp08s-bus) has been
established.

activemq-server.log:2010-06-22 22:57:34,818 [26.190.27:40518] INFO 
DemandForwardingBridge         - SIBBusSupervisor-tpnocp11v-bus bridge to
SIBBusModule-NOCP5-tpnocp08s-bus stopped

activemq-server.log:2010-06-22 22:57:39,153 [26.190.27:40519] INFO 
TransportConnection            - Created Duplex Bridge back to
SIBBusModule-NOCP5-tpnocp08s-bus
activemq-server.log:2010-06-22 22:57:39,153 [ocp11v-bus#1806] INFO 
DemandForwardingBridge         - Network connection between
vm://SIBBusSupervisor-tpnocp11v-bus#1806 and
tcp:///10.26.190.27:40519(SIBBusModule-NOCP5-tpnocp08s-bus) has been
established.

activemq-server.log:2010-06-22 22:58:44,328 [26.190.27:40519] INFO 
DemandForwardingBridge         - SIBBusSupervisor-tpnocp11v-bus bridge to
SIBBusModule-NOCP5-tpnocp08s-bus stopped


Eric-AWL
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