Alan Gates commented on PIG-856:

My $0.02, based on the assumption that we see a significant performance 
improvement using only 1 replica instead of 2 or 3:

In the long term we might want Pig to retry jobs if they fail for this.  But in 
the short term, I would think some users would be willing to trade reliability 
for performance and some would not, so we should let them choose.  

> PERFORMANCE: reduce number of replicas
> --------------------------------------
>                 Key: PIG-856
>                 URL: https://issues.apache.org/jira/browse/PIG-856
>             Project: Pig
>          Issue Type: Improvement
>    Affects Versions: 0.3.0
>            Reporter: Olga Natkovich
> Currently Pig uses the default number of replicas between MR jobs. Currently, 
> the number is 3. Given the temp nature of the data, we should never need more 
> than 2 and should explicitely set it to improve performance and to be nicer 
> to the name node.

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