Sebastian Nagel commented on NUTCH-2334:

Hi [~roannel], I think now with the AND and OR voting strategies I understand 
the motivation why to have multiple "voters", e.g., also select those items 
with a score exceeding a certain threshold, or of a specific domain, etc.  But 
I still wonder whether plugins are required: a plugin comes with a certain 
overhead in the build system and for activation - a lot overhead when only a 
single method (shouldFetch(...)) needs to be implemented. Of course, using 
plugins you get maximum flexibility, but wouldn't be a scheduler applying a 
Jexl expression on URL and CrawlDatum sufficient for most of these decisions? 
Just one suggestion, another is to allow multiple schedulers to be defined in 

> Extension point for schedulers
> ------------------------------
>                 Key: NUTCH-2334
>                 URL: https://issues.apache.org/jira/browse/NUTCH-2334
>             Project: Nutch
>          Issue Type: New Feature
>          Components: generator
>    Affects Versions: 1.12
>            Reporter: Roannel Fernández Hernández
>            Assignee: Roannel Fernández Hernández
>            Priority: Minor
>             Fix For: 1.16
> With an extension point for schedulers, the users should be able to create 
> new schedulers that meet to their own needs.

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