Timeout error in ZooKeeper

Posted by Samir Chauhan on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/Timeout-error-in-ZooKeeper-tp33206.html

Hi,

 

Yesterday morning I got below error in Zookeeper. After this error, my Flink did not connect to ZK and jobs went to hang state. I had to cancel and redeploy my all jobs to bring it to normal state.

2020-02-28 02:45:56,811 [myid:1] - WARN  [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@368] - caught end of stream exception
EndOfStreamException: Unable to read additional data from client sessionid 0x1701028573403f3, likely client has closed socket
        at org.apache.zookeeper.server.NIOServerCnxn.doIO(NIOServerCnxn.java:239)
        at org.apache.zookeeper.server.NIOServerCnxnFactory.run(NIOServerCnxnFactory.java:203)
        at java.lang.Thread.run(Thread.java:748)

At the same time I saw below error in Flink.

2020-02-28 02:46:49,095 ERROR org.apache.curator.ConnectionState                            - Connection timed out for connection string (zk-cs:2181) and timeout (3000) / elapsed (14305)

org.apache.curator.CuratorConnectionLossException: KeeperErrorCode = ConnectionLoss

      at org.apache.curator.ConnectionState.checkTimeouts(ConnectionState.java:225)

      at org.apache.curator.ConnectionState.getZooKeeper(ConnectionState.java:94)

      at org.apache.curator.CuratorZookeeperClient.getZooKeeper(CuratorZookeeperClient.java:117)

      at org.apache.curator.framework.imps.CuratorFrameworkImpl.performBackgroundOperation(CuratorFrameworkImpl.java:835)

      at org.apache.curator.framework.imps.CuratorFrameworkImpl.backgroundOperationsLoop(CuratorFrameworkImpl.java:809)

      at org.apache.curator.framework.imps.CuratorFrameworkImpl.access$300(CuratorFrameworkImpl.java:64)

      at org.apache.curator.framework.imps.CuratorFrameworkImpl$4.call(CuratorFrameworkImpl.java:267)

      at java.util.concurrent.FutureTask.run(FutureTask.java:266)

      at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)

      at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)

      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)

      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)

      at java.lang.Thread.run(Thread.java:748)

 

Has anyone face similar error earlier.

 

My environment is

Azure Kubernetes 1.15.7

Flink 1.6.0

Zookeeper 3.4.10

 

Warm Regards,

Samir Chauhan

 

 

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