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From "Yan Zhou (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-1518) multi file input format for loaders
Date Tue, 17 Aug 2010 16:05:16 GMT

    [ https://issues.apache.org/jira/browse/PIG-1518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12899445#action_12899445
] 

Yan Zhou commented on PIG-1518:
-------------------------------

Another approach is to mark splits as uncombinable only when necessary. Specifically, MergeJoinIndexer
and the base load in mapside cogroup need to be excluded from the split combination. 

Breaking backward compatinility is probably too much a risk to take. In the meanwhile, OrderedLoadFunc
has a notion of "being evolving" that will leave some headroom for future semantic polishes.

> multi file input format for loaders
> -----------------------------------
>
>                 Key: PIG-1518
>                 URL: https://issues.apache.org/jira/browse/PIG-1518
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Olga Natkovich
>            Assignee: Yan Zhou
>             Fix For: 0.8.0
>
>
> We frequently run in the situation where Pig needs to deal with small files in the input.
In this case a separate map is created for each file which could be very inefficient. 
> It would be greate to have an umbrella input format that can take multiple files and
use them in a single split. We would like to see this working with different data formats
if possible.
> There are already a couple of input formats doing similar thing: MultifileInputFormat
as well as CombinedInputFormat; howevere, neither works with ne Hadoop 20 API. 
> We at least want to do a feasibility study for Pig 0.8.0.

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