Github user tillrohrmann commented on a diff in the pull request:

    https://github.com/apache/flink/pull/750#discussion_r38270665
  
    --- Diff: 
flink-runtime/src/main/scala/org/apache/flink/runtime/taskmanager/TaskManager.scala
 ---
    @@ -411,6 +411,23 @@ class TaskManager(
                 log.debug(s"Cannot find task to fail for execution 
${executionID})")
               }
     
    +        // stops a task
    +        case StopTask(executionID) =>
    +          val task = runningTasks.get(executionID)
    +          if (task != null) {
    +            try {
    +              task.stopExecution()
    --- End diff --
    
    I assume that the stops should be idempotent. But I agree if we document 
and check that all `cancel` calls are non-blocking, then it should work as well.


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