[HADOOP-4276] The mapred.*ID classes are inefficient for hashCode and serialization

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.20.0
• Hadoop Flags: Reviewed
• Assignee: Owen O'Malley
• Reporter: Owen O'Malley
• Created: 25/Sep/08 16:37
• Updated: 23/Apr/09 19:17
• Resolved: 23/Oct/08 21:08

Description

Currently the ID classes call toString and hash the resulting string rather than computing a hash directly.

The ID classes also create new instances of the higher level object in readFields (via read) rather than re-using the object via readFields.