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From Gastón Kleiman (JIRA) <j...@apache.org>
Subject [jira] [Updated] (MESOS-7578) Write a proposal to make the I/O Switchboards optional
Date Thu, 08 Jun 2017 16:10:18 GMT

     [ https://issues.apache.org/jira/browse/MESOS-7578?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gastón Kleiman updated MESOS-7578:
----------------------------------
    Story Points: 5

> Write a proposal to make the I/O Switchboards optional
> ------------------------------------------------------
>
>                 Key: MESOS-7578
>                 URL: https://issues.apache.org/jira/browse/MESOS-7578
>             Project: Mesos
>          Issue Type: Task
>          Components: containerization
>            Reporter: Gastón Kleiman
>            Assignee: Gastón Kleiman
>              Labels: check, containerizer, health-check, mesosphere
>
> Right now DEBUG containers can only be started using the LaunchNestedContainerSession
API call. They will enter its parent’s namespaces, inherit environment variables, stream
its I/O, and Mesos will tie their life-cycle to the lifetime of the HTTP connection.
> Streaming the I/O of a container requires an I/O Switchboard and adds some overhead and
complexity:
> - Mesos will launch an extra process, called an I/O Switchboard for each nested container.
These process aren’t free, they take some time to create/destroy and consume resources.
> - I/O Switchboards are managed by a complex isolator.
> - /O Swichboards introduce new race conditions, and have been a source of deadlocks in
the past. 
> Some use cases require some of the features provided by DEBUG containers, but don’t
need the functionality provided by the I/O switchboard. For instance, the Default Executor
uses DEBUG containers to perform (health)checks, but it doesn’t need to stream anything
to/from the container. 



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