[PIG-480] PERFORMANCE: Use identity mapper in a chain of M-R jobs

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 0.2.0
• Assignee: Unassigned
• Reporter: Olga Natkovich
• Created: 09/Oct/08 18:59
• Updated: 03/Mar/11 21:28
• Resolved: 03/Mar/11 21:28

Description

For jobs with two or more MR jobs, use identity mapper wherever possible in second and subsequent MR jobs. Identity mapper is about 50% than pig empty map job because it doesn't parse the data.