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From "Alan Gates (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-856) PERFORMANCE: reduce number of replicas
Date Fri, 19 Jun 2009 00:51:08 GMT

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

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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