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From "Venkatesh Seetharam (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FALCON-965) Open up life cycle stage implementation within Falcon for extension
Date Mon, 22 Dec 2014 19:47:13 GMT

    [ https://issues.apache.org/jira/browse/FALCON-965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14256105#comment-14256105
] 

Venkatesh Seetharam commented on FALCON-965:
--------------------------------------------

I'd have liked a discuss thread before a jira so we know what it is and divy up the work based
on that.

> Open up life cycle stage implementation within Falcon for extension
> -------------------------------------------------------------------
>
>                 Key: FALCON-965
>                 URL: https://issues.apache.org/jira/browse/FALCON-965
>             Project: Falcon
>          Issue Type: Bug
>    Affects Versions: 0.7
>            Reporter: Srikanth Sundarrajan
>            Assignee: Ajay Yadav
>              Labels: recipes
>
> As it stands Falcon supports replication, generation and eviction lifecycle stages and
plans to support more. This however assumes a certain way of implementing a life cycle function
and changes to these implementation aren't easy, as they are not open for easy extension.
This proposed feature is open this up in Falcon.
> Here is a proposal on how things can possibly be:
> * List of life cycles that Falcon supports would be well known and not extensible
> * Dependency between life cycles are coded up in the falcon server and not necessarily
extensible. (In short adding a new life cycle still requires changes in Falcon)
> * Each Lifecycle in falcon advertises an implementation interface and minimum configuration
interface (for ex. Eviction should expose a way to retrieve the configured time limit for
which data will be available for other life cycle stages to validate. There is no point in
having a process consume last 24 instances of a feed, when the retention will retain only
4 instances)
> * Similar to FALCON-634, life cycle implementation can be dropped in as long as the implementation
interface and configuraion interfaces are adhered to.



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