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From "Timothy Bish (JIRA)" <>
Subject [jira] [Commented] (AMQ-6157) Thread leak when failover fails to connect at startup
Date Fri, 05 Feb 2016 00:18:39 GMT


Timothy Bish commented on AMQ-6157:

I did some trivial testing and cannot reproduce this using the latest codebase, try moving
from 5.10.0 to something more current and see how it goes.  If you can create a JUnit test
that reproduces that problem I'm happy to look into it more.  

> Thread leak when failover fails to connect at startup
> -----------------------------------------------------
>                 Key: AMQ-6157
>                 URL:
>             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&amp;wireFormat.maxInactivityDuration=0&amp;daemon=true)?maxReconnectAttempts=2&amp;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$ConditionObject)
>         at java.util.concurrent.locks.LockSupport.park(
>         at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(
>         at java.util.concurrent.LinkedBlockingQueue.take(
>         at java.util.concurrent.ThreadPoolExecutor.getTask(
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(
>         at java.util.concurrent.ThreadPoolExecutor$
>         at
> {code}

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