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From "Matthias Friedrich (JIRA)" <>
Subject [jira] [Commented] (CRUNCH-92) It should be possble to read data from DataBase
Date Sun, 14 Oct 2012 08:20:03 GMT


Matthias Friedrich commented on CRUNCH-92:

To be honest, I've never accessed a relational database from Hadoop. I've always exported
the data first to make my Hadoop jobs reproducible and to prevent DDoS on the database (which
isn't a problem with the suggested implementation). But I understand that this could be useful
to others.

Should we perhaps move this DataBaseSource to crunch-contrib? It is not generally applicable
because for most Crunch jobs it will be the bottleneck and I'm reluctant to add features to
crunch-core that don't scale (and can't be made scalable). At least we have to mention the
limitations in the Javadocs.
> It should be possble to read data from DataBase
> -----------------------------------------------
>                 Key: CRUNCH-92
>                 URL:
>             Project: Crunch
>          Issue Type: New Feature
>            Reporter: Rahul Sharma
>         Attachments: 0001-CRUNCH-92-Database-Source-in-crunch.patch, CRUNCH-92.patch
> At times we need to read some data from RDBMS in a MR job, so crunch should have a Source
for the same.

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