[jira] [Commented] (MESOS-7947) Add GC capability to nested containers

["Qian Zhang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MESOS-7947?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16542684#comment-16542684 ] 

Qian Zhang commented on MESOS-7947:
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For 2, It seems agent will not be notified with the nested container's exit, or we want agent to schedule the GC for the nested container when it receives the terminal state update of the corresponding task?

For 3, I am not sure how to do it silently, the handler of the API {{LAUNCH_NESTED_CONTAINER}} calls {{containerizer->launch()}} directly, so agent itself is even not aware of launching nested container.

I'd prefer solution 1, but the problem is, what is the timing for the executor to call {{GC_NESTED_CONTAINER}}? Once the executor is notified by agent that the nested container terminates? And instead of introducing a new agent API to GC nested container, can we just let the executor to call the existing agent API {{REMOVE_CONTAINER}}? And we may need to add an optional field in {{TaskInfo}} (something like {{GCPolicy}}) so that the executor know when to GC the nested container, if this field is not specified, we just retain the current behavior for backward compatibility. But that seems not a general field (more like a nested container specific field) which is unfortunate.

> Add GC capability to nested containers
> --------------------------------------
>
>                 Key: MESOS-7947
>                 URL: https://issues.apache.org/jira/browse/MESOS-7947
>             Project: Mesos
>          Issue Type: Improvement
>          Components: executor
>            Reporter: Chun-Hung Hsiao
>            Assignee: Joseph Wu
>            Priority: Major
>
> We should extend the existing API or add a new API for nested containers for an executor to tell the Mesos agent that a nested container is no longer needed and can be scheduled for GC.
> Related issue: MESOS-7939



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