[jira] [Commented] (FLUME-2786) It will enter a deadlock state when modify the conf file before I stop flume-ng

[Denes Arvay (JIRA)]

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https://issues.apache.org/jira/browse/FLUME-2786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15628572#comment-15628572
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Denes Arvay commented on FLUME-2786:
------------------------------------

Hi [~adrianjian], thanks for the patch. What do you think, is it possible to 
create a unit test for this?

>  It will enter a deadlock state when modify the conf file before I stop 
> flume-ng
> --------------------------------------------------------------------------------
>
>                 Key: FLUME-2786
>                 URL: https://issues.apache.org/jira/browse/FLUME-2786
>             Project: Flume
>          Issue Type: Bug
>          Components: Master
>    Affects Versions: v1.6.0
>            Reporter: godfrey he
>            Priority: Blocker
>         Attachments: flume-2786-v1.6.0.patch
>
>
> When modify the conf file，and then I stop the flume-ng,  It will enter a 
> deadlock state. 
> jstack result:
> "agent-shutdown-hook" prio=10 tid=0x00007f2e26419800 nid=0x333ae waiting on 
> condition [0x0000000042c16000]
>    java.lang.Thread.State: TIMED_WAITING (parking)
>         at sun.misc.Unsafe.park(Native Method)
>         - parking to wait for  <0x00000000eaff3df8> (a 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
>         at 
> java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:226)
>         at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2082)
>         at 
> java.util.concurrent.ThreadPoolExecutor.awaitTermination(ThreadPoolExecutor.java:1468)
>         at 
> java.util.concurrent.Executors$DelegatedExecutorService.awaitTermination(Executors.java:635)
>         at 
> org.apache.flume.node.PollingPropertiesFileConfigurationProvider.stop(PollingPropertiesFileConfigurationProvider.java:87)
>         at 
> org.apache.flume.lifecycle.LifecycleSupervisor.stop(LifecycleSupervisor.java:106)
>         - locked <0x00000000eaf2daa0> (a 
> org.apache.flume.lifecycle.LifecycleSupervisor)
>         at org.apache.flume.node.Application.stop(Application.java:93)
>         - locked <0x00000000eaf3c580> (a org.apache.flume.node.Application)
>         at org.apache.flume.node.Application$1.run(Application.java:348)
> "conf-file-poller-0" prio=10 tid=0x00007f2e2e8cd000 nid=0x21819 waiting for 
> monitor entry [0x0000000041e3f000]
>    java.lang.Thread.State: BLOCKED (on object monitor)
>         at 
> org.apache.flume.node.Application.handleConfigurationEvent(Application.java:88)
>         - waiting to lock <0x00000000eaf3c580> (a 
> org.apache.flume.node.Application)



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