[HDFS-6917] Add an hdfs debug command to validate blocks, call recoverlease, etc.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.6.0
• Fix Version/s: 2.7.0
• Component/s: hdfs-client
• Target Version/s: 2.6.0
• Assignee: Colin McCabe
• Reporter: Colin McCabe
• Created: 23/Aug/14 00:55
• Updated: 10/Aug/16 20:02
• Resolved: 31/Oct/14 20:37

Description

HDFS should have a debug command which could validate HDFS block files, call recoverLease, and have some other functionality. These commands would be purely for debugging and would appear under a separate command hierarchy inside the hdfs command. There would be no guarantee of API stability for these commands and the debug submenu would not be listed by just typing the "hdfs" command.

Issue Links

• breaks: HDFS-8039 Fix TestDebugAdmin#testRecoverLease and testVerfiyBlockChecksumCommand on Windows
• is related to: HDFS-10747 o.a.h.hdfs.tools.DebugAdmin usage message is misleading
• is related to: HDFS-7326 Add documentation for hdfs debug commands
• relates to: HDFS-7113 Add DFSAdmin Command to Recover Lease