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

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 1.6.0
• Fix Version/s: 1.8.1, 1.9.0
• Component/s: Master
• Flags: Important
• Assignee: Unassigned
• Reporter: godfrey he
• Created: 08/Sep/15 14:40
• Updated: 09/Mar/18 12:20
• Resolved: 09/Mar/18 11:09

Description

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)

Issue Links

• is part of: FLUME-3056 TestApplication hangs indefinitely
• links to: GitHub Pull Request #144