[HADOOP-12384] Add "-direct" flag option for fs copy so that user can choose not to create "._COPYING_" file

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.7.0
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Component/s: fs
• Hadoop Flags: Reviewed
• Release Note: An option '-d' added for all command-line copy commands to skip intermediate '.COPYING' file creation.
• Assignee: J.Andreina
• Reporter: Chen He
• Created: 30/Jun/15 01:58
• Updated: 30/Aug/16 01:23
• Resolved: 08/Sep/15 13:46

Description

Because CLI is using CommandWithDestination.java which add ".COPYING" to the tail of file name when it does the copy. For blobstore like S3 and Swift, to create ".COPYING" file and rename it is expensive. "-direct" flag can allow user to avoiding the ".COPYING" file.