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From "Sujen Shah (JIRA)" <>
Subject [jira] [Commented] (NUTCH-2132) Publisher/Subscriber model for Nutch to emit events
Date Tue, 02 Aug 2016 19:07:20 GMT


Sujen Shah commented on NUTCH-2132:

Updated PR and cleaned the commit log. 

One issue I have not been able to tackle yet is adding dependencies in the plugin. When I
add the amqp-client library as a dependency in the main ivy.xml it works fine, but as I remove
it from there it put it in the plugin specific ivy.xml it does not work. It is not able to
find the jar in classpath during runtime and throws a NoClassDefFound error. Though there
exists a amqp-client jar in runtime/local/plugin/publish-rabbitmq directory. 

Any suggestions how to resolve this ? 

> Publisher/Subscriber model for Nutch to emit events 
> ----------------------------------------------------
>                 Key: NUTCH-2132
>                 URL:
>             Project: Nutch
>          Issue Type: New Feature
>          Components: fetcher, REST_api
>            Reporter: Sujen Shah
>            Assignee: Chris A. Mattmann
>              Labels: memex
>             Fix For: 1.13
>         Attachments: NUTCH-2132.patch, NUTCH-2132.v2.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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