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https://issues.apache.org/jira/browse/HADOOP-4927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12674809#action_12674809
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Doug Cutting commented on HADOOP-4927:
--------------------------------------
A minor nit: in FilterOutputFormat, the checks for a null baseOut and null
rawWriter might be better factored into private getBaseOut() and getRawWriter
methods, so that the body of most filter methods is just one line, e.g.,
'return getBaseOut().getRecordWriter(...);'. Other than that, +1.
> Part files on the output filesystem are created irrespective of whether the
> corresponding task has anything to write there
> --------------------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-4927
> URL: https://issues.apache.org/jira/browse/HADOOP-4927
> Project: Hadoop Core
> Issue Type: New Feature
> Components: mapred
> Reporter: Devaraj Das
> Assignee: Jothi Padmanabhan
> Fix For: 0.21.0
>
> Attachments: hadoop-4927-v1.patch, hadoop-4927-v2.patch,
> hadoop-4927-v3.patch, hadoop-4927-v4.patch, hadoop-4927-v5.patch,
> hadoop-4927.patch
>
>
> When OutputFormat.getRecordWriter is invoked, a part file is created on the
> output filesystem. But the created RecordWriter is not used until the
> OutputCollector.collect call is made by the task (user's code). This results
> in empty part files even if the OutputCollector.collect is never invoked by
> the corresponding tasks.
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