Esteban Laver updated BAHIR-110:
    Summary: Implement _changes API for non-streaming receiver  (was: Replace 
use of _all_docs API with _changes API in all receivers)

> Implement _changes API for non-streaming receiver
> -------------------------------------------------
>                 Key: BAHIR-110
>                 URL: https://issues.apache.org/jira/browse/BAHIR-110
>             Project: Bahir
>          Issue Type: Improvement
>            Reporter: Esteban Laver
>   Original Estimate: 216h
>  Remaining Estimate: 216h
> Today we use the _changes API for Spark streaming receiver and _all_docs API 
> for non-streaming receiver. _all_docs API supports parallel reads (using 
> offset and range) but performance of _changes API is still better in most 
> cases (even with single threaded support).
> With this ticket we want to:
> a) implement _changes API for non-streaming receivers
> b) allow customers to pick either _all_docs (default) or _changes API 
> endpoint, with documentation about pros and cons
> _changes performance details:
> Successfully loaded Cloudant (using local cloudant-developer docker image) 
> docs into Spark (local standalone) with the following database sizes: 15GB 
> (time: 8 1/2 mins), 20GB (17 mins), 46GB (25 mins), and 75GB (48 1/2 mins).

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