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https://issues.apache.org/jira/browse/HBASE-24273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17093901#comment-17093901
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Michael Stack commented on HBASE-24273:
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Good find [~timoha]. I can give this a go unless you want to (easy now you've
done all the hard work figuring why these regions showing in the orphans list).
> HBCK's "Orphan Regions on FileSystem" reports regions with referenced HFiles
> ----------------------------------------------------------------------------
>
> Key: HBASE-24273
> URL: https://issues.apache.org/jira/browse/HBASE-24273
> Project: HBase
> Issue Type: Bug
> Components: hbck2
> Affects Versions: 2.2.4
> Environment: HBase 2.2.4
> Hadoop 3.1.3
> Reporter: Andrey Elenskiy
> Priority: Major
>
> This issue came up after merging regions. MergeTableRegionsProcedure removes
> the parent regions from hbase:meta and creates HFile references in child
> region to the old parent regions. Running `hbck_chore_run` right after the
> `merge_region` will show the parent regions in "Orphan Regions on FileSystem"
> until major compaction is run on child region which will remove HFile
> references and cause Catalog Janitor to clean up the parent regions.
> There are probably other situations which can cause the same issue (maybe
> region split?)
> Having "Orphan Regions on FileSystem" list parent regions and suggest to
> "_hbase completebulkload_" is dangerous in this case as completing bulk load
> in this case will lead to stale HFile references in child region which will
> cause it's OPEN to fail because referenced HFile doesn't exist.
> Figuring out these things for database administrators is tedious, so I think
> it would be reasonable to not consider regions with referenced HFiles to be
> orphans (or maybe could give an extra hint saying that it has referenced
> HFiles).
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