[HBASE-3929] Add option to HFile tool to produce basic stats

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.92.0
• Fix Version/s: 0.92.0
• Component/s: io
• Hadoop Flags: Reviewed
• Assignee: Matteo Bertozzi
• Reporter: Todd Lipcon
• Created: 27/May/11 18:30
• Updated: 20/Nov/15 12:42
• Resolved: 21/Oct/11 18:43

Description

In looking at HBASE-3421 I wrote a small tool to scan an HFile and produce some basic statistics about it:

• min/mean/max key size, value size (uncompressed)
• min/mean/max number of columns per row (uncompressed)
• min/mean/max number of bytes per row (uncompressed)
• the key of the largest row

Issue Links

• relates to: HBASE-3421 Very wide rows -- 30M plus -- cause us OOME