[jira] [Created] (FLINK-4944) Replace Akka's deatch watch with own heartbeat on the TM side

[Shang Yuanchun (Jira)]

Till Rohrmann created FLINK-4944:
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             Summary: Replace Akka's deatch watch with own heartbeat on the TM side
                 Key: FLINK-4944
                 URL: https://issues.apache.org/jira/browse/FLINK-4944
             Project: Flink
          Issue Type: Improvement
          Components: TaskManager
    Affects Versions: 1.2.0
            Reporter: Till Rohrmann
            Assignee: Till Rohrmann
             Fix For: 1.2.0


In order to properly implement FLINK-3347, the {{TaskManager}} must no longer use Akka's death watch mechanism to detect {{JobManager}} failures. The reason is that a hard {{JobManager}} failure will lead to quarantining the {{JobManager's}} {{ActorSystem}} by the {{TaskManagers}}. This in combination with FLINK-3347 would lead to a shutdown of all {{TaskManagers}}.

Instead we should use our own heartbeat signal to detect dead {{JobManagers}}. In case of a heartbeat timeout, the {{TaskManager}} won't shut down but simply cancel and clear everything.



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