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From "William Slacum (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-391) Multi-table Accumulo input format
Date Wed, 25 Sep 2013 15:02:02 GMT


William Slacum commented on ACCUMULO-391:

I've been a proponent of what Keith is talking about for a while. There's nothing tying us
to the current method of configuring jrrbs besides convention (which I'm all for throwing
out if the only reason for doing is "everyone else is doing it"). The current {{Configurator}}
mechanism we have now is a mess and there are constraints dumped into the {{Configuration}}
(such as the only-setting-connection-info-once constraint we have) that user has to jump through
at least one hoop to even check. I think this discussion is best suited to another ticket.

To get back on topic, I wouldn't worry about having things configured for tables that aren't
going to be scanned. It'd be nice to warn about it, but it's not a show stopper. It's extra
state that goes unevaluated, so really it's just trimming the fat. I can't see a bug happening
from it that wouldn't be caught with minimal exercise/testing.
> Multi-table Accumulo input format
> ---------------------------------
>                 Key: ACCUMULO-391
>                 URL:
>             Project: Accumulo
>          Issue Type: New Feature
>            Reporter: John Vines
>            Assignee: Corey J. Nolet
>            Priority: Minor
>              Labels: mapreduce,
>             Fix For: 1.6.0
>         Attachments: ACCUMULO-391.patch, multi-table-if.patch, new-multitable-if.patch
> Just realized we had no MR input method which supports multiple Tables for an input format.
I would see it making the table the mapper's key and making the Key/Value a tuple, or alternatively
have the Table/Key be the key tuple and stick with Values being the value.

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