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https://issues.apache.org/jira/browse/HBASE-28560?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel Roudnitsky updated HBASE-28560:
--------------------------------------
Labels: Quota (was: quotas)
> 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
> Priority: Major
> Labels: Quota
>
> 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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