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From "Gabriel Reid (JIRA)" <>
Subject [jira] [Commented] (CRUNCH-231) Support legacy Mappers and Reducers in Crunch pipelines
Date Tue, 02 Jul 2013 07:23:20 GMT


Gabriel Reid commented on CRUNCH-231:

Yeah, I can definitely follow Dave's reasoning here -- but I'm also definitely +1 on adding
this functionality (haven't had a chance to take a look at the patch yet though).

I see this as being potentially really useful for integrating with something like Mahout,
where lots of interesting functionality that has been implemented directly in Mapper and Reducer
classes. This shouldn't be the primary way of working with Crunch (obviously), but I really
think it's a nice thing to have.
> Support legacy Mappers and Reducers in Crunch pipelines
> -------------------------------------------------------
>                 Key: CRUNCH-231
>                 URL:
>             Project: Crunch
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Josh Wills
>            Assignee: Josh Wills
>         Attachments: mapred.patch
> I've had a few requests for Crunch to support existing Mappers and Reducers using the
underlying Java APIs as part of regular pipelines, so that users could evolve existing MapReduce
jobs into Crunch pipelines gradually, instead of being forced to rewrite everything all at
once in order to map it onto Crunch's model.

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