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Jothi Padmanabhan commented on HADOOP-4927:
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True, this feature can be achieved by modifying RecordWriter implementations. But that would mean people who have their own implementations would need to add it themselves, see Devaraj's [comment|https://issues.apache.org/jira/browse/HADOOP-4927?focusedCommentId=12658455#action_12658455] Also, this feature is a sort of generic across the different output formats and having the framework support this would be useful. No?
Part files on the output filesystem are created irrespective of whether the corresponding task has anything to write there
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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.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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