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https://issues.apache.org/jira/browse/NUTCH-2132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14943658#comment-14943658
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Chris A. Mattmann commented on NUTCH-2132:
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Great comments, Seb, agree.

> Publisher/Subscriber model for Nutch to emit events 
> ----------------------------------------------------
>
>                 Key: NUTCH-2132
>                 URL: https://issues.apache.org/jira/browse/NUTCH-2132
>             Project: Nutch
>          Issue Type: New Feature
>          Components: fetcher, REST_api
>            Reporter: Sujen Shah
>              Labels: memex
>             Fix For: 1.11
>
>         Attachments: NUTCH-2132.patch
>
>
> It would be nice to have a Pub/Sub model in Nutch to emit certain events (ex- 
> Fetcher events like fetch-start, fetch-end, a fetch report which may contain 
> data like outlinks of the current fetched url, score, etc). 
> A consumer of this functionality could use this data to generate real time 
> visualization and generate statics of the crawl without having to wait for 
> the fetch round to finish. 
> The REST API could contain an endpoint which would respond with a url to 
> which a client could subscribe to get the fetcher events. 



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