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From "Aron Ahmadia (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (NUTCH-2132) Publisher/Subscriber model for Nutch to emit events
Date Wed, 28 Oct 2015 18:00:31 GMT

    [ https://issues.apache.org/jira/browse/NUTCH-2132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14978908#comment-14978908
] 

Aron Ahmadia commented on NUTCH-2132:
-------------------------------------

Also, the vice-versa situation is important as well.  Can I start up a Nutch server that isn't
configured to publish, then turn publishing on?

> 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: 1.12
>
>         Attachments: NUTCH-2132.patch, PubSub_routingkey.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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