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From "Sujen Shah (JIRA)" <>
Subject [jira] [Updated] (NUTCH-2132) Publisher/Subscriber model for Nutch to emit events
Date Thu, 29 Oct 2015 20:21:28 GMT


Sujen Shah updated NUTCH-2132:
    Attachment: NUTCH-2132.v2.patch

Hi Folks, 

Just found a few more cases where exceptions are thrown, one of them is : sometimes when a
exchange server with same name but a different exchange type is used error is thrown (when
the RMQ server is not restarted). Or if the RMQ server goes down after successful initialization.

I am uploading a new patch(NUTCH-2132.v2.patch) in which I have tried to catch all exceptions
instead of specific ones like in the earlier patch. 

> 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
>              Labels: memex
>             Fix For: 1.12
>         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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