HBASE-30453 BucketCache region cached size is not decremented on eviction for non-persistent IOEngines - #8737
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…tion for non-persistent IOEngines
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JIRA: https://issues.apache.org/jira/browse/HBASE-30432
regionCachedSize was decremented only in fileNotFullyCached, which blockEvicted calls only for persistent IOEngines, so offheap evictions were never subtracted. Moved the decrement into blockEvicted to mirror the increment in putIntoBackingMap.
This also fixes a double decrement in the persistent cache validation thread (evictBlock followed by fileNotFullyCached) that occurred before the fix.
Tests: