Jeff Hammerbacher commented on PIG-979:

One could also cite the SOSP paper from MSR this year comparing the iterator to 
the accumulator interface, though I have a hard time concisely stating their 
conclusions: http://sigops.org/sosp/sosp09/papers/yu-sosp09.pdf.

> Acummulator Interface for UDFs
> ------------------------------
>                 Key: PIG-979
>                 URL: https://issues.apache.org/jira/browse/PIG-979
>             Project: Pig
>          Issue Type: New Feature
>            Reporter: Alan Gates
>            Assignee: Ying He
> Add an accumulator interface for UDFs that would allow them to take a set 
> number of records at a time instead of the entire bag.

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