[KYLIN-1917] TopN counter merge performance improvement

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: v1.5.2, v1.5.3
• Fix Version/s: v1.6.0
• Component/s: Job Engine
• Assignee: Shao Feng Shi
• Reporter: Shao Feng Shi
• Created: 22/Jul/16 10:50
• Updated: 26/Nov/16 08:12
• Resolved: 21/Oct/16 01:27

Description

Observed the reduce phase of cube build is slow when there is TopN counter. There should be room for performance improvement.