Yurong Fu created HBASE-30483:
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Summary: Namespace region quota count is not updated correctly
after truncating a table
Key: HBASE-30483
URL: https://issues.apache.org/jira/browse/HBASE-30483
Project: HBase
Issue Type: Bug
Reporter: Yurong Fu
When a table is truncated without preserving its splits, the old regions are
replaced by a new primary region. However, the namespace region quota count
maintained in NamespaceStateManager may still reflect the number of regions
before truncation.
For example, suppose a namespace has a region quota of 2 and a table has 2
primary regions. After truncating the table without preserving splits, the
table has only 1 primary region, but the cached namespace region count may
remain at 2. A subsequent split can then be rejected with a
QuotaExceededException, even though the split would only bring the actual
region from 1 to 2.
Expected Behavior:
After truncation, the namespace region quota count should reflect the number of
primary regions in the replacement table.
Actual Behavior:
The cached region count may remain stale after truncation, causing valid region
operations to be rejected.
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