[HADOOP-17021] Add concat fs command

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 3.3.1
• Component/s: fs
• Labels: pull-request-available
• Release Note: "hadoop fs" has a concat command. Available on all filesystems which support the concat API including HDFS and WebHDFS
• Assignee: Jinglun
• Reporter: Jinglun
• Created: 30/Apr/20 11:11
• Updated: 18/Nov/20 11:22
• Resolved: 08/Oct/20 09:37

Description

We should add one concat fs command for ease of use. It concatenates existing source files into the target file using FileSystem.concat().

Issue Links

• links to: GitHub Pull Request #1993
• links to: PR LINK