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https://issues.apache.org/jira/browse/MESOS-8037?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16184641#comment-16184641
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Vinod Kone commented on MESOS-8037:
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[~jieyu] What's your opinion on this?
> ns::clone should spawn process, which is a direct child
> -------------------------------------------------------
>
> Key: MESOS-8037
> URL: https://issues.apache.org/jira/browse/MESOS-8037
> Project: Mesos
> Issue Type: Improvement
> Reporter: Andrei Budnik
>
> `ns::clone` does double-fork in order to be able to enter given PID namespace
> and returns grandchild's pid, which is not a direct child of a parent
> process, hence parent process can not retrieve status of an exited grandchild
> process.
> As second fork is implemented via `os::clone`, we can pass `CLONE_PARENT`
> flag. Also, we have to handle both intermediate child process and grandchild
> process to avoid zombies.
> Motivation behind this improvement is that both `docker exec` and `LXC
> attach` can enter process' PID namespace, while still controlling child's
> status code.
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