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https://issues.apache.org/jira/browse/MAPREDUCE-5777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14007566#comment-14007566
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zhihai xu commented on MAPREDUCE-5777:
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Made a little optimization not to copy the first line twice for text file
without BOM. We suppose the text files which have BOM is rare.
> Support utf-8 text with BOM (byte order marker)
> -----------------------------------------------
>
> Key: MAPREDUCE-5777
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5777
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Affects Versions: 0.22.0, 2.2.0
> Reporter: bc Wong
> Assignee: zhihai xu
> Attachments: MAPREDUCE-5777.patch
>
>
> UTF-8 text may have a BOM. TextInputFormat, KeyValueTextInputFormat and
> friends should recognize the BOM and not treat it as actual data.
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