[KYLIN-767] Generate statistics data for the cube segments that built with old cubing algorithm

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: v1.4.0
• Fix Version/s: v1.4.0
• Component/s: Job Engine, Metadata
• Sprint: Sprint 42, Sprint 43, Sprint 44, Sprint 45, Sprint 46
• Assignee: Shao Feng Shi
• Reporter: Shao Feng Shi
• Created: 14/May/15 08:58
• Updated: 25/Aug/15 02:19
• Resolved: 25/Aug/15 02:19

Description

In the new cubing algorithm, the cube merge will depend on the statistics data that collected in the sampling step, to estimate the final HTable size; While for the cubes that built with old algorithm, there is no statistics data; So, to support existing cubes/segments, Kylin need generate the statistics from existing HTables; Then it will be doable to merge with the new segments.