[CURATOR-554] restart zk , task in thread "Curator-ConnectionStateManager-0" stop ,leaderLatch failed

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Not A Problem
• Affects Version/s: 4.0.1, 4.2.0
• Component/s: Framework
• Assignee: Unassigned
• Reporter: Husky Zeng
• Created: 09/Jan/20 08:20
• Updated: 10/Jan/20 13:20
• Resolved: 10/Jan/20 13:20

Description

stop zk ，after two minutes restart it.

the thread in ConnectionStateManager named "Curator-ConnectionStateManager-0" break out the dead Loop.

code : org.apache.curator.framework.state.ConnectionStateManager#start

the task stopped and would not restasrt ,so that when a new connectionState (such as reconnect) coming , there would no any response.

it will lead to leaderLatch failed.

 

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Hi,all

   I have already resolved this problem , it caused by version compatibility .I uesd zookeeper-client- 3.5.1.jar  and  curaot-framwork-4.1.0.jar .

   while the JVM initializing static block in class org.apache.curator.utils.Compatibility  ,it throw a error,but not Exception!

 

-----------------------------------------------------------

  2020-01-10T04:33:27,568|ERROR|Curator-ConnectionStateManager-0|org.apache.curator.framework.state.ConnectionStateManager|Could not inject session expiration
java.lang.ExceptionInInitializerError: null
at org.apache.curator.utils.Compatibility.injectSessionExpiration(Compatibility.java:66) ~[curator-client-4.1.0.jar:?]
at org.apache.curator.framework.state.ConnectionStateManager.checkSessionExpiration(ConnectionStateManager.java:315) [curator-framework-4.1.0.jar:4.1.0]
at org.apache.curator.framework.state.ConnectionStateManager.processEvents(ConnectionStateManager.java:287) [curator-framework-4.1.0.jar:4.1.0]
at org.apache.curator.framework.state.ConnectionStateManager.access$000(ConnectionStateManager.java:45) [curator-framework-4.1.0.jar:4.1.0]
at org.apache.curator.framework.state.ConnectionStateManager$1.call(ConnectionStateManager.java:121) [curator-framework-4.1.0.jar:4.1.0]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_201]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_201]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_201]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_201]
Caused by: java.lang.RuntimeException: Could not access internal ZooKeeper fields
at org.apache.curator.utils.InjectSessionExpiration.<clinit>(InjectSessionExpiration.java:75) ~[curator-client-4.1.0.jar:?]
... 9 more
Caused by: java.lang.NoSuchMethodException: org.apache.zookeeper.ClientCnxnSocket.wakeupCnxn()
at java.lang.Class.getDeclaredMethod(Class.java:2130) ~[?:1.8.0_201]
at org.apache.curator.utils.InjectSessionExpiration.<clinit>(InjectSessionExpiration.java:70) ~[curator-client-4.1.0.jar:?]
... 9 more

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I change the code “catch Exception ”  to "catch throwable"，and the error finnaly appeared .

 

the error made my Curator-ConnectionStateManager-0 down , so that my appliacation can not known th reconnect of zk!