[HADOOP-1385] MD5Hash has a bad hash function

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.12.3
• Fix Version/s: 0.13.0
• Component/s: io
• Assignee: Owen O'Malley
• Reporter: Owen O'Malley
• Created: 17/May/07 21:49
• Updated: 08/Jun/07 20:40
• Resolved: 21/May/07 23:01

Description

The MD5Hash class has a really bad hash function, that will cause most most md5s to hash to 0xFFFFFFxx leaving only the low order byte as meaningful. The problem comes from the automatic sign extension when promoting from byte to int.