[FLUME-1854] Application class can deadlock if stopped immediately after start

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.4.0
• Assignee: Brock Noland
• Reporter: Brock Noland
• Created: 17/Jan/13 00:28
• Updated: 20/Feb/17 13:28
• Resolved: 25/Jan/13 20:51

Description

Only appears to affect shutting down the agent when it's still being started.

"agent-shutdown-hook" prio=10 tid=0x00000000460b7800 nid=0x5c41 waiting on condition [0x0000000042484000]
   java.lang.Thread.State: TIMED_WAITING (parking)
        at sun.misc.Unsafe.park(Native Method)
        - parking to wait for  <0x00000000f9ec4a08> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
        at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:196)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2025)
        at java.util.concurrent.ThreadPoolExecutor.awaitTermination(ThreadPoolExecutor.java:1253)
        at java.util.concurrent.Executors$DelegatedExecutorService.awaitTermination(Executors.java:597)
        at org.apache.flume.node.PollingPropertiesFileConfigurationProvider.stop(PollingPropertiesFileConfigurationProvider.java:87)
        at org.apache.flume.lifecycle.LifecycleSupervisor.stop(LifecycleSupervisor.java:106)
        - locked <0x00000000f9ed2258> (a org.apache.flume.lifecycle.LifecycleSupervisor)
        at org.apache.flume.node.Application.stop(Application.java:92)
        at org.apache.flume.node.Application$1.run(Application.java:302)


"conf-file-poller-0" prio=10 tid=0x000000004610a000 nid=0x5c2b waiting for monitor entry [0x0000000042180000]
   java.lang.Thread.State: BLOCKED (on object monitor)
        at org.apache.flume.lifecycle.LifecycleSupervisor.supervise(LifecycleSupervisor.java:125)
        - waiting to lock <0x00000000f9ed2258> (a org.apache.flume.lifecycle.LifecycleSupervisor)
        at org.apache.flume.node.Application.startAllComponents(Application.java:146)
        at org.apache.flume.node.Application.handleConfigurationEvent(Application.java:88)
        - locked <0x00000000f9eccc88> (a org.apache.flume.node.Application)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:68)
        at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
        - locked <0x00000000f9ee5fa0> (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$FileWatcherRunnable.run(PollingPropertiesFileConfigurationProvider.java:140)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
        at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:98)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java:180)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:204)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)

Issue Links

• relates to: FLUME-3056 TestApplication hangs indefinitely
• links to: Review Board