Daniel Roudnitsky created HBASE-28560:
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Summary: Region quotas: Split/merge procedure rollback can lead to
inaccurate account of region counts
Key: HBASE-28560
URL: https://issues.apache.org/jira/browse/HBASE-28560
Project: HBase
Issue Type: Bug
Affects Versions: 3.0.0-beta-2
Reporter: Daniel Roudnitsky
Assignee: Daniel Roudnitsky
When region quotas are enabled, HMaster keeps an in memory account of region
counts through NamespaceStateManager. Region counts in NamespaceStateManager
are incremented/decremented at the beginning stages of split/merge procedures,
in SPLIT_TABLE_REGION_PRE_OPERATION/MERGE_TABLE_REGIONS_PRE_MERGE_OPERATION
before any region is offlined. If the split/merge procedure gets rolled back
after the region count change in NamespaceStateManager is made, the split/merge
procedure rollback does not revert the region count change in
NamespaceStateManager to reflect that the expected split/merge never succeeded.
This leaves NamespaceStateManager with an inaccurate account of the number of
regions, believing that there are more/less regions than actually exist.
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