[HADOOP-4927] Part files on the output filesystem are created irrespective of whether the corresponding task has anything to write there

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.21.0
• Hadoop Flags: Reviewed
• Release Note: All output part files are created regardless of whether the corresponding task has output.
• Assignee: Jothi Padmanabhan
• Reporter: Devaraj Das
• Created: 22/Dec/08 05:59
• Updated: 24/Aug/10 20:34
• Resolved: 23/Feb/09 08:22

Description

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.