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https://issues.apache.org/jira/browse/PIG-1062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12772623#action_12772623
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Thejas M Nair commented on PIG-1062:
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Even after the interface changes, pig can compute the file size by adding up 
size of each split (from InputSplit.getLenght()) . The documentation of the 
function in the interface does not make it clear if this is size on disk , 
compressed/uncompressed etc. Assuming it is size on disk (uncompressed), 
estimating the total memory it will require is a challenge, one has to make 
assumption about the compression ratio and the serialization method.
Using Tuple.getMemorySize() while sampling will give more accurate numbers for 
reducer memory that it will consume.

> load-store-redesign branch: change SampleLoader and subclasses to work with 
> new LoadFunc interface 
> ---------------------------------------------------------------------------------------------------
>
>                 Key: PIG-1062
>                 URL: https://issues.apache.org/jira/browse/PIG-1062
>             Project: Pig
>          Issue Type: Sub-task
>            Reporter: Thejas M Nair
>            Assignee: Thejas M Nair
>
> This is part of the effort to implement new load store interfaces as laid out 
> in http://wiki.apache.org/pig/LoadStoreRedesignProposal .
> PigStorage and BinStorage are now working.
> SampleLoader and subclasses -RandomSampleLoader, PoissonSampleLoader need to 
> be changed to work with new LoadFunc interface.  
> Fixing SampleLoader and RandomSampleLoader will get order-by queries working.
> PoissonSampleLoader is used by skew join. 

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