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https://issues.apache.org/jira/browse/MAPREDUCE-1649?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zheng Shao updated MAPREDUCE-1649:
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Attachment: MAPREDUCE-1649.1.branch-0.20.patch
A simple fix (MAPREDUCE-1649.1.branch-0.20.patch) is to ignore the splits that
start with non-0 offset in {{TextInputFormat}} when the file is non-splittable.
> Compressed files with TextInputFormat does not work with
> CombineFileInputFormat
> -------------------------------------------------------------------------------
>
> Key: MAPREDUCE-1649
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1649
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 0.20.2
> Reporter: Zheng Shao
> Assignee: Zheng Shao
> Attachments: MAPREDUCE-1649.1.branch-0.20.patch
>
>
> {{CombineFileInputFormat}} creates splits based on blocks, regardless whether
> the underlying {{FileInputFormat}} is splittable or not..
> This means that we can have 2 or more splits for a compressed text file with
> {{TextInputFormat}}. For each of these splits,
> {{TextInputFormat.getRecordReader}} will return a {{RecordReader}} for the
> whole compressed file, thus causing duplicate input data.
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