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https://issues.apache.org/jira/browse/MAPREDUCE-5670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13840323#comment-13840323
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Jason Lowe commented on MAPREDUCE-5670:
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CombineFileRecordReader.initNextRecordReader should report progress as it moves
to the next file to indicate that the task is making progress even though no
records are being read. Some input formats already report progress when their
record reader is created, but adding a progress indicator here will catch the
cases where the underlying record reader does not report progress upon
construction.
> CombineFileRecordReader should report progress when moving to the next file
> ---------------------------------------------------------------------------
>
> Key: MAPREDUCE-5670
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5670
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 0.23.9, 2.2.0
> Reporter: Jason Lowe
> Priority: Minor
>
> If a combine split consists of many "empty" files (i.e.: no record found by
> the underlying record reader) then theoretically a task can timeout due to
> lack of reported progress.
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