Jeff Zhang commented on PIG-688:

What do you mean about the iterator interface ? I check the source code of 
MapRunner, it gets input from RecordReader one by one. So in the Mapper class 
it only get one tuple each time, how can it get multiple tuples ?

> PERFORMANCE: Vectorize operators
> --------------------------------
>                 Key: PIG-688
>                 URL: https://issues.apache.org/jira/browse/PIG-688
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Thejas M Nair
> By Vectorization, I mean passing multiple (/vector of) records at a time 
> between operators (and potentially other functions like udfs)
> Vectorization of pig operators can improve performance by 
> 1. improving locality and cache utilization
> 2. Reducing number of function calls. Many functions calls are likely to be 
> dynamically resolved. There may be some checks in each function that we might 
> be able to do once for several recs.
> 3. Potentially benefit from cpu pipeline architecture. ( But I don't know how 
> good java VM is at that ..)
> To do vectorization in map stage, we need to use MapRunner - see PIG-687.

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