[ 
https://issues.apache.org/jira/browse/FLINK-21472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17289790#comment-17289790
 ] 

Matthias commented on FLINK-21472:
----------------------------------

There seem to be some connection issue to retrieve the leader information:
{code}
2021-02-24 09:48:09,749 WARN  
io.fabric8.kubernetes.client.dsl.internal.WatchConnectionManager [] - Exec 
Failure
java.net.SocketTimeoutException: sent ping but didn't receive pong within 
30000ms (after 0 successful ping/pongs)
        at 
org.apache.flink.kubernetes.shaded.okhttp3.internal.ws.RealWebSocket.writePingFrame(RealWebSocket.java:546)
 [flink-kubernetes_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
org.apache.flink.kubernetes.shaded.okhttp3.internal.ws.RealWebSocket$PingRunnable.run(RealWebSocket.java:530)
 [flink-kubernetes_2.11-1.12-SNAPSHOT.jar:1.12-SNAPSHOT]
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
[?:1.8.0_282]
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) 
[?:1.8.0_282]
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
 [?:1.8.0_282]
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
 [?:1.8.0_282]
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) 
[?:1.8.0_282]
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) 
[?:1.8.0_282]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_282]
2021-02-24 09:48:10,761 INFO  
org.apache.flink.kubernetes.highavailability.KubernetesLeaderElectionDriver [] 
- Creating a new watch on ConfigMap mta-flink-dispatcher-leader.
2021-02-24 09:49:10,764 WARN  
io.fabric8.kubernetes.client.dsl.internal.WatchConnectionManager [] - Exec 
Failure
java.net.SocketTimeoutException: sent ping but didn't receive pong within 
30000ms (after 0 successful ping/pongs)
{code}

The strange thing is that the {{FencingTokenExceptions}} occur even before the 
30 secs of the timeout are passed. [~fly_in_gis] are you able to get anything 
else out of the logs?


> FencingTokenException: Fencing token mismatch
> ---------------------------------------------
>
>                 Key: FLINK-21472
>                 URL: https://issues.apache.org/jira/browse/FLINK-21472
>             Project: Flink
>          Issue Type: Bug
>          Components: Deployment / Kubernetes
>    Affects Versions: 1.12.1
>            Reporter: hayden zhou
>            Priority: Major
>         Attachments: 
> flink--standalonesession-0-mta-flink-jobmanager-864d6c8cbb-rmsxw.log
>
>
> org.apache.flink.runtime.rest.handler.job.JobsOverviewHandler [] - Unhandled 
> exception.
> org.apache.flink.runtime.rpc.exceptions.FencingTokenException: Fencing token 
> mismatch: Ignoring message 
> LocalFencedMessage(8fac01d8e3e3988223a2e5c6e3f04f1e, 
> LocalRpcInvocation(requestMultipleJobDetails(Time))) because the fencing 
> token 8fac01d8e3e3988223a2e5c6e3f04f1e did not match the expected fencing 
> token 8c37414f464bca76144e6cabc946474b.



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