Github user rmetzger commented on the issue:
https://github.com/apache/flink/pull/2080
These are the relevant logs of the task:
```
20:11:35,397 INFO org.apache.flink.runtime.taskmanager.Task
- Attempting to cancel task Source: Custom Source -> Map -> Map
Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/2080
Do you know where the canceling looses the time?
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