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https://issues.apache.org/jira/browse/PIG-1389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12883354#action_12883354
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Richard Ding commented on PIG-1389:
-----------------------------------
It seems there is no good solution for Merge Join and Merge Cogroup in this
case. So I'm going to treat them the same way as Replicated Join and not add
counters for all side files.
> 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
>
>
> 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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