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Date: Fri, 27 Aug 2010 14:51:54 -0400 (EDT)
From: "Yan Zhou (JIRA)" <jira@apache.org>
To: pig-dev@hadoop.apache.org
Subject: [jira] Commented: (PIG-1518) multi file input format for loaders
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    [ https://issues.apache.org/jira/browse/PIG-1518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12903528#action_12903528 ] 

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

All other functionalities except for the two mentioned in the previous comment will see splits combined by default, if necessary.

> 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
>
>         Attachments: PIG-1518.patch, PIG-1518.patch, PIG-1518.patch, PIG-1518.patch, PIG-1518.patch, PIG-1518.patch, PIG-1518.patch, PIG-1518.patch
>
>
> 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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