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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-1389) Implement Pig counter to track number of rows for each input files
Date Fri, 09 Jul 2010 21:45:52 GMT

    [ https://issues.apache.org/jira/browse/PIG-1389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12886904#action_12886904
] 

Ashutosh Chauhan commented on PIG-1389:
---------------------------------------

+1 

Discussed about 3) with Richard offline. Though theoretically it will be better to find out
the features on the fully compiled and optimized MR plan, it will be hard and may not be worth
the complexity doing it. So, in this first pass it is fine to mark those features while MR
plan's compilation is in progress. As a result in few corner cases, features marked for MR
Oper may not be correct. We will fix up those cases as and when they come up.

> Implement Pig counter to track number of rows for each input files 
> -------------------------------------------------------------------
>
>                 Key: PIG-1389
>                 URL: https://issues.apache.org/jira/browse/PIG-1389
>             Project: Pig
>          Issue Type: Improvement
>    Affects Versions: 0.7.0
>            Reporter: Richard Ding
>            Assignee: Richard Ding
>             Fix For: 0.8.0
>
>         Attachments: PIG-1389.patch, PIG-1389.patch, PIG-1389_1.patch, PIG-1389_2.patch
>
>
> A MR job generated by Pig not only can have multiple outputs (in the case of multiquery)
but also can have multiple inputs (in the case of join or cogroup). In both cases, the existing
Hadoop counters (e.g. MAP_INPUT_RECORDS, REDUCE_OUTPUT_RECORDS) can not be used to count the
number of records in the given input or output.  PIG-1299 addressed the case of multiple outputs.
 We need to add new counters for jobs with multiple inputs.

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