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https://issues.apache.org/jira/browse/PIG-1389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12882394#action_12882394
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Richard Ding commented on PIG-1389:
-----------------------------------
For a job with multiple inputs (i.e. join, cogroup, cross), we add one counter
per user input. We don't add counter if input is from an intermediate file. The
reason for doing this is MR input record counter is the sum of all inputs, and
users want to know the number of records read from individual input.
> 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
>
>
> 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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