Zhitao Li created MESOS-8768:

             Summary: Provide custom reason for cascaded kill in a task group
                 Key: MESOS-8768
                 URL: https://issues.apache.org/jira/browse/MESOS-8768
             Project: Mesos
          Issue Type: Improvement
            Reporter: Zhitao Li

Currently, if a task fails in a task group, other active tasks in the same 
group will see _TASK_KILLED_ without any custom reason. We would like to 
provide a custom reason like _*REASON_TASK_GROUP_KILLED*_ to distinguish 
whether the task is killed upon request of scheduler or upon a cascaded failure.


Open question: does any framework depends the value of this reason? If not, we 
probably can just change the reason without a opt-in mechanism from framework 
(i.e, a new framework capability).

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