Andrey Elenskiy created HBASE-24273:
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Summary: 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
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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