[MAPREDUCE-5950] incorrect description in distcp2 document

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.2.1, 2.4.0
• Fix Version/s: 2.6.0
• Component/s: documentation
• Labels: newbie
• Target Version/s: 2.6.0
• Assignee: Akira Ajisaka
• Reporter: Yongjun Zhang
• Created: 08/Jun/14 06:53
• Updated: 01/Dec/14 03:08
• Resolved: 14/Aug/14 17:11

Description

In http://hadoop.apache.org/docs/r1.2.1/distcp2.html#UpdateAndOverwrite

The first statement of the "Update and Overwrite" section says:

-update is used to copy files from source that don't exist at the target, or have different contents. -overwrite overwrites target-files even if they exist at the source, or have the same contents.

The "Command Line Options" table says :

-overwrite: Overwrite destination
-update: Overwrite if src size different from dst size

Based on the implementation, making the following modification would be more accurate:

The first statement of the "Update and Overwrite" section:

-update is used to copy files from source that don't exist at the target, or have different contents. -overwrite overwrites target-files if they exist at the target.

The "Command Line Options" table:

  -overwrite: Overwrite destination
  -update: Overwrite destination if source and destination have different contents

Thanks.