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From Praveen Adlakha <praveen.adla...@inmobi.com>
Subject Re: [DISCUSS] Apache Falcon 1.0 release
Date Wed, 06 Apr 2016 08:20:54 GMT
Hi All,

I believe Approach 1 looks more cleaner and hassle free.


On Wed, Apr 6, 2016 at 12:13 AM, Ajay Yadava <ajayyadava@apache.org> wrote:

> Hello everyone,
> For quite some time we have been discussing to make a 1.0 release and have
> had several discussions in developer sync up around it. Taking this to next
> step, I propose next release line(after 0.10) of Apache Falcon to be 1.0
> *Item 1 - Scope and Timelines*
> Some of the items that are in works and I personally feel will be idle
> candidate for 1.0 are - clean up our APIs(add a new version), introduce a
> new shell for Falcon feed sla alerts, and move to the more powerful and
> capable lifecycle framework for feeds among few.
> After lot of thought and discussions with several members, I propose to not
> aim for too many big features and a timeline of 2.5-3 months after the 0.10
> release. This will ensure that critical fixes are not delayed and there is
> only one active working line for code. We can add more features if other
> community members are able to get them committed in time and our quality
> team also feels comfortable.
> *Item 2 - Migration Strategy*
> While some of the changes like REST API clean up etc. can be done by adding
> versioning others like migration to lifecycle framework etc. are bit more
> involved. One important decision to be made is how to migrate to 1.0
> release.
> Here are some of the options to migrate to new entity definitions in 1.0
> (NOTE: REST api can be versioned and same end points can continue to work
> albeit with newer definitions)
> *Approach 1*. Take a one time hit, call the release backward incompatible
> and provide changes inside falcon to automatically migrate to newer
> definitions on start up. We can support this migration code for a couple of
> releases and then later on remove it.
>  pros:
> - Clean and easy to code -  no if else etc. for supporting features in
> multiple manners.
> - Intuitive for users - multiple options for same purpose are confusing for
> the users.
> - Easier to maintain - All bug fixes need to be done only in one code flow
> and not at many places.
> cons:
> - involves migration - it can be automated by incorporating the migration
> as part of falcon startup.
> *Approach 2*. Support both old and new entity definitions.
> pros
> - users can work with both versions and migrate at their own pace
> cons
> - Hard to maintain - Lot of code will need to be duplicated (validations
> etc.) or branched (wf builders etc.) All bug fixes will need to be fixed in
> multiple places.
> - Not scalable approach - The code will not scale easily if we decide to
> support one more version.
> - Manual migration - Users will have to migrate themselves to the new
> entity definitions.
> - Gotchas - What will happen if someone submits in newer version but calls
> update in older version?
> I invite all of you to provide your thoughts on both the items. There might
> be more approaches or points to consider, suggestions are welcome.
> Cheers
> Ajay Yadava

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