[NIFI-2337] IllegalMonitorStateException when disconnecting node

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.0.0
• Fix Version/s: 1.0.0, 1.0.0-Beta
• Component/s: Core Framework
• Assignee: Joe Witt
• Reporter: Mark Payne
• Created: 21/Jul/16 00:37
• Updated: 01/Jun/18 22:18
• Resolved: 29/Jul/16 02:29

Description

When a node is disconnected from the cluster, it often logs a stacktrace similar to:

2016-07-20 20:20:47,814 ERROR [Leader Election Notification Thread-1] o.a.c.f.recipes.leader.LeaderSelector The leader threw an exception
java.lang.IllegalMonitorStateException: You do not own the lock: /leaders/Cluster Coordinator
        at org.apache.curator.framework.recipes.locks.InterProcessMutex.release(InterProcessMutex.java:140) ~[curator-recipes-2.10.0.jar:na]
        at org.apache.curator.framework.recipes.leader.LeaderSelector.doWork(LeaderSelector.java:425) [curator-recipes-2.10.0.jar:na]
        at org.apache.curator.framework.recipes.leader.LeaderSelector.doWorkLoop(LeaderSelector.java:441) [curator-recipes-2.10.0.jar:na]
        at org.apache.curator.framework.recipes.leader.LeaderSelector.access$100(LeaderSelector.java:64) [curator-recipes-2.10.0.jar:na]
        at org.apache.curator.framework.recipes.leader.LeaderSelector$2.call(LeaderSelector.java:245) [curator-recipes-2.10.0.jar:na]
        at org.apache.curator.framework.recipes.leader.LeaderSelector$2.call(LeaderSelector.java:239) [curator-recipes-2.10.0.jar:na]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_74]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_74]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_74]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_74]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_74]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_74]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.8.0_74]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_74]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_74]
        at java.lang.Thread.run(Thread.java:745) [na:1.8.0_74]

This error, I believe, is harmless but is alarming and should be addressed.

Issue Links

• is related to: CURATOR-337 LeaderSelector logs stack trace with "The leader threw an exception" message erroneously
• links to: GitHub Pull Request #731