[HDFS-8151] Always use snapshot path as source when invalid snapshot names are used for diff based distcp

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.7.0
• Fix Version/s: 2.8.0, 2.7.1, 3.0.0-alpha1
• Component/s: distcp
• Hadoop Flags: Reviewed
• Assignee: Jing Zhao
• Reporter: Sushmitha Sreenivasan
• Created: 15/Apr/15 18:38
• Updated: 06/Jan/17 01:51
• Resolved: 15/Apr/15 19:42

Description

This is a bug reported by ssreenivasan:

HDFS-8036 makes the diff-based distcp use snapshot path as the source. This should also happen when

1. invalid snapshot names are provided as distcp parameters thus the diff report computation on the target cluster fails
2. there is modification happening in the target cluster thus checkNoChange returns false

In other cases like source and target FS are not DistributedFileSystem, we should throw exceptions.