[jira] [Commented] (MESOS-3421) Support sharing persistent volumes across task instances

["Anindya Sinha (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MESOS-3421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14743761#comment-14743761 ] 

Anindya Sinha commented on MESOS-3421:
--------------------------------------

I am proposing the following for persistent volumes to be shared across task containers:

i) Added a "optional bool shared" to the "Persistence" section of the protobuf Resource.DiskInfo. It defaults to false which means it retains the current behavior. Setting this to "true" when CREATE/DELETE of volumes is done would mark them as sharable persistent volumes.
ii) All persistent volumes that are sharable shall be offered to the corresponding framework which own these persistent volumes (even if a task used this volume in its task constraint). Tasks should be therefore be able to use this resource in its task constraint to schedule tasks on the same slave.

The idea is to maintain the list of "shared" persistent volumes, and offer them to the appropriate frameworks as valid resources inspite of this being assigned to a scheduled task on that agent node.


> Support sharing persistent volumes across task instances
> --------------------------------------------------------
>
>                 Key: MESOS-3421
>                 URL: https://issues.apache.org/jira/browse/MESOS-3421
>             Project: Mesos
>          Issue Type: Improvement
>          Components: general
>    Affects Versions: 0.23.0
>            Reporter: Anindya Sinha
>            Assignee: Anindya Sinha
>
> A service that needs persistent volume needs to have access to the same persistent volume (RW) from multiple task(s) instances on the same agent node. Currently, a persistent volume once offered to the framework(s) can be scheduled to a task and until that tasks terminates, that persistent volume cannot be used by another task.
> Explore providing the capability of sharing persistent volumes across task instances scheduled on a single agent node.



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