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https://issues.apache.org/jira/browse/FLUME-3056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15874547#comment-15874547
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ASF GitHub Bot commented on FLUME-3056:
---------------------------------------
GitHub user andrasbeni opened a pull request:
https://github.com/apache/flume/pull/108
FLUME-3056 TestApplication hangs indefinitely
Skip configuration handling in Application while stop() is running
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/andrasbeni/flume TestApplication
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flume/pull/108.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #108
----
commit e8cd0f4ca49deede65bad14fe35b2d391750a30b
Author: Andras Beni <andrasb...@cloudera.com>
Date: 2017-02-19T14:45:00Z
Prevent application from hanging when it tries to reconfigure itself while
stopping.
----
> TestApplication hangs indefinitely
> ----------------------------------
>
> Key: FLUME-3056
> URL: https://issues.apache.org/jira/browse/FLUME-3056
> Project: Flume
> Issue Type: Bug
> Components: Configuration, Test
> Affects Versions: v1.7.0
> Reporter: Andras Beni
> Priority: Minor
>
> Unit test hangs indefinitely when TestApplication.testFLUME1854() becomes
> blocked in the following, deadlock-like situation:
> Application waits for PollingPropertiesFileConfigurationProvider to stop
> while PollingPropertiesFileConfigurationProvider tries to notify Application
> of configuration change.
> {noformat}
> "conf-file-poller-0" #17750 prio=5 os_prio=31 tid=0x00007fdeb7972000
> nid=0x638f waiting for monitor entry [0x000070000eb36000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at
> org.apache.flume.node.Application.handleConfigurationEvent(Application.java:87)
> - waiting to lock <0x000000077a130178> (a
> org.apache.flume.node.Application)
> at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:68)
> at
> com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
> - locked <0x000000077a1301b0> (a
> com.google.common.eventbus.SynchronizedEventHandler)
> at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)
> at
> com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
> at com.google.common.eventbus.EventBus.post(EventBus.java:264)
> at
> org.apache.flume.node.PollingPropertiesFileConfigurationProvider$FileWatcherRunnable.run(PollingPropertiesFileConfigurationProvider.java:141)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> Locked ownable synchronizers:
> - <0x000000077a130250> (a
> java.util.concurrent.ThreadPoolExecutor$Worker)
> "main" #1 prio=5 os_prio=31 tid=0x00007fdeb9000000 nid=0x1b03 waiting on
> condition [0x000070000d779000]
> java.lang.Thread.State: TIMED_WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000006c253e9f8> (a
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
> at
> java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
> at
> java.util.concurrent.ThreadPoolExecutor.awaitTermination(ThreadPoolExecutor.java:1465)
> at
> java.util.concurrent.Executors$DelegatedExecutorService.awaitTermination(Executors.java:675)
> at
> org.apache.flume.node.PollingPropertiesFileConfigurationProvider.stop(PollingPropertiesFileConfigurationProvider.java:88)
> at
> org.apache.flume.lifecycle.LifecycleSupervisor.stop(LifecycleSupervisor.java:104)
> - locked <0x000000077a138158> (a
> org.apache.flume.lifecycle.LifecycleSupervisor)
> at org.apache.flume.node.Application.stop(Application.java:92)
> - locked <0x000000077a130178> (a org.apache.flume.node.Application)
> at
> org.apache.flume.node.TestApplication.testFLUME1854(TestApplication.java:155)
> {noformat}
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