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Posted to dev@pig.apache.org by "Olga Natkovich (JIRA)" <ji...@apache.org> on 2008/10/09 21:00:47 UTC
[jira] Created: (PIG-480) Use identity mapper in a chain of M-R
jobs
Use identity mapper in a chain of M-R jobs
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Key: PIG-480
URL: https://issues.apache.org/jira/browse/PIG-480
Project: Pig
Issue Type: Improvement
Affects Versions: types_branch
Reporter: Olga Natkovich
Fix For: types_branch
For jobs with two or more MR jobs, use identity mapper wherever possible in second and subsequent MR jobs. Identity mapper is about 50% than pig empty map job because it doesn't parse the data.
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[jira] Updated: (PIG-480) PERFORMANCE: Use identity mapper in a
chain of M-R jobs
Posted by "Olga Natkovich (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/PIG-480?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Olga Natkovich updated PIG-480:
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Summary: PERFORMANCE: Use identity mapper in a chain of M-R jobs (was: Use identity mapper in a chain of M-R jobs)
> PERFORMANCE: Use identity mapper in a chain of M-R jobs
> -------------------------------------------------------
>
> Key: PIG-480
> URL: https://issues.apache.org/jira/browse/PIG-480
> Project: Pig
> Issue Type: Improvement
> Affects Versions: types_branch
> Reporter: Olga Natkovich
> Fix For: types_branch
>
>
> For jobs with two or more MR jobs, use identity mapper wherever possible in second and subsequent MR jobs. Identity mapper is about 50% than pig empty map job because it doesn't parse the data.
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