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Date: Thu, 14 May 2015 00:18:06 +0000 (UTC)
From: "Adam B (JIRA)" <jira@apache.org>
To: issues@mesos.apache.org
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Subject: [jira] [Commented] (MESOS-1554) Persistent resources support for
 storage-like services
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    [ https://issues.apache.org/jira/browse/MESOS-1554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14542968#comment-14542968 ] 

Adam B commented on MESOS-1554:
-------------------------------

This Epic/feature is critical for stateful frameworks in Mesos 0.23 and beyond. Upgraded Priority to Critical.

> Persistent resources support for storage-like services
> ------------------------------------------------------
>
>                 Key: MESOS-1554
>                 URL: https://issues.apache.org/jira/browse/MESOS-1554
>             Project: Mesos
>          Issue Type: Epic
>          Components: general, hadoop
>            Reporter: Nikita Vetoshkin
>            Priority: Critical
>              Labels: twitter
>
> This question came up in [dev mailing list|http://mail-archives.apache.org/mod_mbox/mesos-dev/201406.mbox/%3CCAK8jAgNDs9Fe011Sq1jeNr0h%3DE-tDD9rak6hAsap3PqHx1y%3DKQ%40mail.gmail.com%3E].
> It seems reasonable for storage like services (e.g. HDFS or Cassandra) to use Mesos to manage it's instances. But right now if we'd like to restart instance (e.g. to spin up a new version) - all previous instance version sandbox filesystem resources will be recycled by slave's garbage collector.
> At the moment filesystem resources can be managed out of band - i.e. instances can save their data in some database specific placed, that various instances can share (e.g. {{/var/lib/cassandra}}).
> [~benjaminhindman] suggested an idea in the mailing list (though it still needs some fleshing out):
> {quote}
> The idea originally came about because, even today, if we allocate some
> file system space to a task/executor, and then that task/executor
> terminates, we haven't officially "freed" those file system resources until
> after we garbage collect the task/executor sandbox! (We keep the sandbox
> around so a user/operator can get the stdout/stderr or anything else left
> around from their task/executor.)
> To solve this problem we wanted to be able to let a task/executor terminate
> but not *give up* all of it's resources, hence: persistent resources.
> Pushing this concept even further you could imagine always reallocating
> resources to a framework that had already been allocated those resources
> for a previous task/executor. Looked at from another perspective, these are
> "late-binding", or "lazy", resource reservations.
> At one point in time we had considered just doing 'right-of-first-refusal'
> for allocations after a task/executor terminate. But this is really
> insufficient for supporting storage-like frameworks well (and likely even
> harder to reliably implement then 'persistent resources' IMHO).
> There are a ton of things that need to get worked out in this model,
> including (but not limited to), how should a file system (or disk) be
> exposed in order to be made persistent? How should persistent resources be
> returned to a master? How many persistent resources can a framework get
> allocated?
> {quote}


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