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From Siddharth Seth <ss...@apache.org>
Subject Re: [DISCUSS] YARN-5079 : Native YARN framework layer for services and Apache Slider
Date Tue, 19 Jul 2016 22:29:14 GMT
+1 as a step towards better service support in YARN.

In terms of compatibility and Slider fixes - is the intent to allow
existing slider packages to work without migrating over to the new
agent-less, etc implementation in Hadoop. e.g. Assuming the slider
integration work is released in Hadoop 2.xx - would an existing slider
package which works on Hadoop-2.6 + Slider 0.91.0 continue to work without
changes?

On Mon, Jul 18, 2016 at 12:23 PM, Gour Saha <gsaha@hortonworks.com> wrote:

> +1 forwarding from the discussion in Slider DL
>
> Note: On the Slider side, we plan to create a branch corresponding to this
> YARN branch. In this, we intend to remove all the pieces which will move
> to the YARN branch (Slider core, AM, client). We will retain the Agent and
> app-packages which will then depend on the new hadoop-slider module (in
> addition to the existing hadoop modules that it already depends on). This
> will create a single view of Slider codebase, exactly as it stands today,
> fully supporting the current app-packages. Slider can even release its
> future versions from this new branch, once the hadoop-sldier module
> reaches a matured state. It will be an easier path for existing Slider
> users/app-owners to move to the future stable state of Slider completely
> off of Hadoop YARN codebase. All that would be expected is to migrate the
> app-packages to the agent-less version. Of course the Slider community
> will do the migration for the current app-packages in the Slider codebase.
>
> -Gour
>
> On 7/14/16, 7:36 PM, "Vinod Kumar Vavilapalli" <vinodkv@apache.org> wrote:
>
> >Hi, Hadoop YARN community!
> >
> >(Cross-posting across Hadoop and Slider communities)
> >
> >I opened a JIRA a little while ago to pursue a native YARN framework for
> >services: https://issues.apache.org/jira/browse/YARN-5079.
> >
> >It is part of a bigger effort that a bunch of us YARN community members
> >are interested in making progress on: YARN-4692 - [Umbrella] Simplified
> >and first-class support for services in YARN.
> >
> >The idea is that with our current attention on making services
> >first­-class, it's time to take a fresh look at how we can make Apache
> >Hadoop YARN support services well out of the box. I’ve been looking at
> >various possibilities - ranging from a custom new framework room scratch
> >to using one of the existing projects - and stopped at Apache Slider
> >(http://slider.incubator.apache.org) given its association with some of
> >the YARN community members (Steve Loughran, Devaraj Das, Arun C Murthy,
> >myself etc.).
> >
> >Slider client & AM already handles a great deal of the functionality that
> >we need. I posit that assimilating the client, ApplicationMaster etc of
> >an existing framework like Apache Slider can serve our purpose really
> >well. My early informal discussions about this with few Hadoop and Slider
> >community members yielded generally favourable feedback.
> >
> >The Apache Slider incubator community also discussed this and expressed
> >generally positive interest in YARN taking up Slider’s key pieces, you
> >can see that discussion here: https://s.apache.org/0hoh.
> >
> >So in summary, we are looking to the following
> >
> >- Code
> >   ― ‘Graduate' key pieces (Slider client, AM) of Apache Slider into
> >Apache Hadoop for providing a native services experiences in YARN
> >   ― Leave for now some of the pieces behind in Apache Slider - (a)
> >Slider agent as we won’t need it, (b) Slider packages that need more
> >deliberation in terms of where they will live in the long term.
> >   ― Create a branch in YARN, copy this code over into a new module(s),
> >and work towards completing a functioning app running on YARN.
> >
> >- Communities & releases
> >   ― Good thing is that many of Apache Slider community members are
> >already seasoned folk in the Apache Hadoop ecosystem projects. For those
> >committers & PMC in Slider that are not yet Hadoop committers / PMC,
> >without complicating things much, a proposed path forward is active
> >participation in the branch (as branch committers?) and eventually in
> >mainline YARN and thus go through a natural progression to committership
> >/ PMC. Given that most of the members are stalwarts in the Apache
> >communities, this should be a cinch IMO.
> >   ― The work on this new code can start, and depending on its state, and
> >assuming that the experiment succeeds, can be merged into trunk and later
> >picked up in the next nearest & feasible Apache Hadoop release.
> >   ― While the work on forked-over-code goes on till we have a
> >functioning app, the current Apache Slider project continues to live,
> >with supporting releases etc. At some point in the future, when things
> >become clearer, more decisions can be taken on the (parts left behind in
> >the) incubating project’s future.
> >
> >Thoughts?
> >
> >Thanks
> >+Vinod
>
>

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