[HADOOP-2771] changing the number of reduces dramatically changes the time of the map time

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.17.1
• Fix Version/s: 0.20.0
• Assignee: Unassigned
• Reporter: Owen O'Malley
• Created: 02/Feb/08 00:19
• Updated: 08/Jul/09 16:52
• Resolved: 02/Dec/08 09:30

Description

By changing the number of reduces, the time for an individual map changes radically. By running the same program and data with different numbers of reduces (2500, 7500, 25000) the times for each map changed radically (0:50, 1:20, 5h).