[jira] [Assigned] (YARN-4793) [Umbrella] Simplified API layer for services and beyond

["Gour Saha (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/YARN-4793?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gour Saha reassigned YARN-4793:
-------------------------------

    Assignee: Gour Saha  (was: Vinod Kumar Vavilapalli)

I have been working on an API design doc for a while. I am assigning this to myself. Will upload a first draft of the document.

> [Umbrella] Simplified API layer for services and beyond
> -------------------------------------------------------
>
>                 Key: YARN-4793
>                 URL: https://issues.apache.org/jira/browse/YARN-4793
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Vinod Kumar Vavilapalli
>            Assignee: Gour Saha
>
> [See overview doc at YARN-4692, modifying and copy-pasting some of the relevant pieces and sub-section 3.3.2 to track the specific sub-item.]
> Bringing a new service on YARN today is not a simple experience. The APIs of existing frameworks are either too low­ level (native YARN), require writing new code (for frameworks with programmatic APIs ) or writing a complex spec (for declarative frameworks).
> In addition to building critical building blocks inside YARN (as part of other efforts at YARN-4692), we should also look to simplifying the user facing story for building services. Experience of projects like Slider building real-­life services like HBase, Storm, Accumulo, Solr etc gives us some very good learnings on how simplified APIs for building services will look like.
> To this end, we should look at a new simple-services API layer backed by REST interfaces. The REST layer can act as a single point of entry for creation and lifecycle management of YARN services. Services here can range from simple single-­component apps to the most complex, multi­-component applications needing special orchestration needs.
> We should also look at making this a unified REST based entry point for other important features like resource­-profile management (YARN-3926), package-definitions' lifecycle­-management and service­-discovery (YARN-913 / YARN-4757). We also need to flesh out its relation to our present much ­lower level REST APIs (YARN-1695) in YARN for application-­submission and management.



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