[HDFS-11061] Update dfs -count -t command line help and documentation

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 2.8.0, 3.0.0-alpha2
• Component/s: documentation, fs
• Labels: docuentation supportability
• Hadoop Flags: Reviewed
• Assignee: Yiqun Lin
• Reporter: Wei-Chiu Chuang
• Created: 26/Oct/16 17:36
• Updated: 02/Oct/19 17:14
• Resolved: 28/Oct/16 22:41

Description

According to dfs -count command line help, -t option must be used along with -q.

• However, the current behavior is that -t can be used without -q, it's just silently ignored.
• In addition, -t may also be used with -u.
• The FileSystemShell doc does not state -t must be used along with -q. This should either be enforced in the code, or update the doc/command line.
• Also, the list of possible parameters for -t option is not described in the doc. Looking at the code (Count.java), the list of possible parameters are either empty string (="all"), "all", "ram_disk", "ssd", "disk" or "archive" (caseless)