[HBASE-9104] RegionChecker to track when regions go unavailable and back opened

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Incomplete
• Component/s: monitoring, Region Assignment, regionserver
• Assignee: Unassigned
• Reporter: Ibragim Ismailov
• Created: 31/Jul/13 20:24
• Updated: 16/Jun/22 17:49
• Resolved: 16/Jun/22 17:49

Description

whenever region is closed/opened (due to region close, or regionserver restart/abort/kill, regions reassigment, ...), we store this information in zookeeper to know availability ratio of every region and whole cluster. So, RegionChecker class does that and provides methods to get these ratios.