[HADOOP-16428] Distcp don't make use of S3a Committers, be it magic or staging

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Won't Fix
• Affects Version/s: 3.1.1
• Component/s: fs/s3, tools/distcp
• Assignee: Unassigned
• Reporter: Sahil Kaw
• Created: 12/Jul/19 06:14
• Updated: 15/Jul/19 12:30
• Resolved: 15/Jul/19 10:31

Description

Currently, I don't see Distcp make use of S3a Committers, be it Magic or Staging and I have noticed most of the jobs which use MapReduce frameworks use S3 committers except distcp. Distcp makes use of the FileOutputCommitter even if S3a committer parameters are specified in the core-site.xml. Is this by design? If yes, can someone please explain the reason for that. Are there any limitations or potential risks of using S3a committers with Distcp? 

I know there is a "-direct" option that can be used with the FileOutputCommitter in order to avoid renaming while committing fr object Stores. But if anyone can put some light on the current limitation of S3a committers with distcp and reason for choosing FileOutputCommitters for Distcp over S3a committers, it would be helpful.  Thanks