[jira] [Updated] (MESOS-3891) Add a helper function to the Agent to check available resources before launching a task.

["Guangya Liu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MESOS-3891?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Guangya Liu updated MESOS-3891:
-------------------------------

There is a ticket MESOS-2647 handling same issue for usage slack.

> Add a helper function to the Agent to check available resources before launching a task. 
> -----------------------------------------------------------------------------------------
>
>                 Key: MESOS-3891
>                 URL: https://issues.apache.org/jira/browse/MESOS-3891
>             Project: Mesos
>          Issue Type: Bug
>            Reporter: Artem Harutyunyan
>            Assignee: Guangya Liu
>              Labels: mesosphere
>
> Launching a task using revocable resources should be funnelled through an accounting system:
> * If a task is launched using revocable resources, the resources must not be in use when launching the task.  If they are in use, then the task should fail to start.
> * If a task is launched using reserved resources, the resources must be made available.  This means potentially evicting tasks which are using revocable resources.
> Both cases could be implemented by adding a check in Slave::runTask, like a new helper method:
> {noformat}
> class Slave {
>   ...
>   // Checks if the given resources are available (i.e. not utilized)
>   // for starting a task.  If not, the task should either fail to
>   // start or result in the eviction of revocable resources.
>   virtual process::Future<bool> checkAvailableResources(
>       const Resources& resources);
>   ...
> }
> {noformat}



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