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https://issues.apache.org/jira/browse/HADOOP-3040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12580316#action_12580316
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Amareshwari Sriramadasu commented on HADOOP-3040:
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Just for information, InputFormat handling of keys and values is fine, problem
was in MROutputThread of PipeMapred i.e at the collect in PipeMapred
> Streaming should assume an empty key if the first character on a line is the
> seperator (stream.map.output.field.separator, by default, tab)
> -------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-3040
> URL: https://issues.apache.org/jira/browse/HADOOP-3040
> Project: Hadoop Core
> Issue Type: Bug
> Components: contrib/streaming
> Reporter: Amareshwari Sriramadasu
> Assignee: Amareshwari Sriramadasu
> Fix For: 0.17.0
>
> Attachments: patch-3040.txt
>
>
> Streaming should assume an empty key if the first character on a line is the
> seperator (stream.map.output.field.separator, by default, tab). And the value
> as the whole line excluding the seperator.
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