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https://issues.apache.org/jira/browse/PIG-856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12721590#action_12721590
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Alan Gates commented on PIG-856:
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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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