[HBASE-22527] [hbck2] Add a master web ui to show the problematic regions

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0-alpha-1, 2.3.0, 2.0.6, 2.2.1, 2.1.6
• Component/s: hbase-operator-tools, hbck2

Release Note

Add a new master web UI to show the potentially problematic opened regions. There are three case:
1. Master thought this region opened, but no regionserver reported it.
2. Master thought this region opened on Server1, but regionserver reported Server2
3. More than one regionservers reported opened this region

• Assignee: Guanghao Zhang
• Reporter: Guanghao Zhang
• Created: 03/Jun/19 01:54
• Updated: 24/Jul/19 00:12
• Resolved: 24/Jul/19 00:12

Description

On our cluster which based 2.2.0, we found one problem: there are some opened regions which had wrong regionserver in meta. The regionserver is not exist. We used hbck2 to fix them by the following steps.

1. disable table
2. bypass the stucked close region procedure (as the target regionserver is not exist) and disable table procedure.
3. setRegionState to CLOSED.
4. setTableState to DISABLED.
5. enable table

We found this problem by scan the hbase:meta. I thought we should add this feature to hbck2. The we can use hbck2 to find this problem. Thanks.

Issue Links

• links to: GitHub Pull Request #373