[HBASE-24316] GCMulitpleMergedRegionsProcedure is not idempotent

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0-alpha-1, 2.3.0, 2.4.0
• Fix Version/s: 3.0.0-alpha-1, 2.3.0
• Component/s: proc-v2
• Assignee: Huaxiang Sun
• Reporter: Huaxiang Sun
• Created: 04/May/20 16:36
• Updated: 14/Jul/20 18:27
• Resolved: 06/May/20 23:08

Description

Currently deleteMergeQualifiers() is not idempotent. If two GCMulitpleMergedRegionsProcedures are run for the same merged child region, the second run will delete the row for the merge region from meta table and leave a hole. It needs to make sure it only deletes columns with merge qualifiers.

https://github.com/apache/hbase/blob/master/hbase-client/src/main/java/org/apache/hadoop/hbase/MetaTableAccessor.java#L1849

Issue Links

• incorporates: HBASE-24323 Avoid two parallel running of GCMulitpleMergedRegionsProcedure over the same region.
• links to: GitHub Pull Request #1660
• links to: GitHub Pull Request #1663
• links to: GitHub Pull Request #1671