[jira] [Resolved] (AMQ-6157) Thread leak when failover fails to connect at startup

["Erik (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AMQ-6157?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Erik resolved AMQ-6157.
-----------------------
    Resolution: Not A Problem

You are right, the problem is not in the failover but in the JMS bridge, or the use of both in combination. Since failover is not needed here it does not seem like a real problem.

Thanks for your help


> Thread leak when failover fails to connect at startup
> -----------------------------------------------------
>
>                 Key: AMQ-6157
>                 URL: https://issues.apache.org/jira/browse/AMQ-6157
>             Project: ActiveMQ
>          Issue Type: Bug
>         Environment: Tomee plus 1.7.2 which includes ActiveMQ 5.10.0
> Linux tomee 3.13.0-49-generic #83-Ubuntu SMP Fri Apr 10 20:11:33 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
> java version "1.8.0_66"
> Java(TM) SE Runtime Environment (build 1.8.0_66-b17)
> Java HotSpot(TM) 64-Bit Server VM (build 25.66-b17, mixed mode)
>            Reporter: Erik
>         Attachments: broker-config.xml, jstack.txt, tomee.xml
>
>
> I have configured several brokers and sometimes one of them is not available when the application server is started.
> When left running the amount of threads slowly builds up, depending how often reconnect fails, and consumes more and more memory
> To reproduce I have deliberately configured failover with a host that is not reachable 
> {code}
> failover:(tcp://host.not.found:1234?keepAlive=true&wireFormat.maxInactivityDuration=0&daemon=true)?maxReconnectAttempts=2&startupMaxReconnectAttempts=1)
> {code}
> When I start Tomee, AMQ is not able to connect as expected
> {code}
> Feb 04, 2016 1:13:27 PM org.apache.activemq.transport.failover.FailoverTransport doReconnect
> SEVERE: Failed to connect to [tcp://host.not.found:6523?keepAlive=true&wireFormat.maxInactivityDuration=0&daemon=true] after: 1 attempt(s)
> {code}
> For each reconnect attempt a new thread is created and left waiting for a lock. These threads seem to wait indefinately
> {code}
> "ActiveMQ Connection Executor: unconnected" #75 daemon prio=5 os_prio=0 tid=0x00007f083c040000 nid=0xfaa waiting on condition [0x00007f0824fc1000]
>    java.lang.Thread.State: WAITING (parking)
>         at sun.misc.Unsafe.park(Native Method)
>         - parking to wait for  <0x00000000c080aa78> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
>         at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
>         at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
>         at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
>         at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>         at java.lang.Thread.run(Thread.java:745)
> {code}



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