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https://issues.apache.org/jira/browse/MESOS-4547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15156825#comment-15156825
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Guangya Liu commented on MESOS-4547:
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A new file was added for the command executor related to TASK_KILLING but no RR
for this:
https://github.com/apache/mesos/blob/master/src/tests/command_executor_tests.cpp
> Introduce TASK_KILLING state.
> -----------------------------
>
> Key: MESOS-4547
> URL: https://issues.apache.org/jira/browse/MESOS-4547
> Project: Mesos
> Issue Type: Improvement
> Reporter: Benjamin Mahler
> Assignee: Abhishek Dasgupta
> Labels: mesosphere
> Fix For: 0.28.0
>
>
> Currently there is no state to express that a task is being killed, but is
> not yet killed (see MESOS-4140). In a similar way to how we have
> TASK_STARTING to indicate the task is starting but not yet running, a
> TASK_KILLING state would indicate the task is being killed but is not yet
> killed.
> This would need to be guarded by a framework capability to protect old
> frameworks that cannot understand the TASK_KILLING state.
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