Stephan Ewen commented on FLINK-4650:

Am I right in assuming that the TaskManager is not marked as lost by the 
JobManager (disappears in the web UI), but the connection for shuffles breaks. 
Does it recover properly?

Would be good to see if the source node (titus-248496-worker-0-2/ 
has anything suspicious in the logs.

> Frequent task manager disconnects from JobManager
> -------------------------------------------------
>                 Key: FLINK-4650
>                 URL: https://issues.apache.org/jira/browse/FLINK-4650
>             Project: Flink
>          Issue Type: Bug
>            Reporter: Nagarjun Guraja
> Not sure of the exact reason but we observe more frequent task manager 
> disconnects while using 1.2 snapshot build as compared to 1.1.2 release build

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