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https://issues.apache.org/jira/browse/PIG-856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12723269#action_12723269
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Milind Bhandarkar commented on PIG-856:
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Replication of 2 is 17% faster than replication for 3 for the sort benchmark.
But, the sort benchmark does not have any computation in mappers or reducers.
Therefore, the percentage improvement for Pig will definitely be much less.
> 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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