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Posted to dev@pig.apache.org by "Olga Natkovich (JIRA)" <ji...@apache.org> on 2009/12/04 00:36:21 UTC

[jira] Assigned: (PIG-480) PERFORMANCE: Use identity mapper in a chain of M-R jobs

     [ https://issues.apache.org/jira/browse/PIG-480?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Olga Natkovich reassigned PIG-480:
----------------------------------

    Assignee: Ying He

> 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: 0.2.0
>            Reporter: Olga Natkovich
>            Assignee: Ying He
>         Attachments: PIG_480.patch
>
>
> 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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