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https://issues.apache.org/jira/browse/HADOOP-4927?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Doug Cutting updated HADOOP-4927:
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Status: Open (was: Patch Available)
A few nits:
- we need a public setter method for lazy file creation,
setLazyOutput(boolean). This should probably go on mapred.JobConf and
mapreduce.Job.
- this does not need to be in hadoop-default.xml. That file is for options
that are configured site-wide in hadoop-site.xml, not per-job parameters.
> 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.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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