[HBASE-3521] region be merged with others automatically when all data in the region has expired and removed, or region gets too small.

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Invalid
• Affects Version/s: 0.90.0
• Component/s: master, regionserver, scripts
• Assignee: Unassigned
• Reporter: zhoushuaifeng
• Created: 10/Feb/11 08:39
• Updated: 12/Jun/22 00:55
• Resolved: 11/Apr/15 00:49

Description

We have test a cluster which have more than 30,000 regions, max size of a region is 512MB. At this situation, data no more growing, but remove some old data and insert new, and regions will be more and more. And some regions may be very small or empty. This occupies too much heapsize, and will be more if regions cannot be merged. This will limit hbase running for a long time.
A script that does a survey to remove empty regions, or pick out adjacent small regions that then does the online merge up seems like it would be useful.

Issue Links

• is superceded by: HBASE-13103 [ergonomics] add region size balancing as a feature of master