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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