Michael Stack created HBASE-25159:
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Summary: [hbck2] Add an 'adoption service' for 'Orphaned Regions'
Key: HBASE-25159
URL: https://issues.apache.org/jira/browse/HBASE-25159
Project: HBase
Issue Type: Bug
Components: hbck2
Reporter: Michael Stack
The 'HBCK Report' has a section for 'Orphaned Regions', regions in the
filesystem that are no longer referenced by the running hbase. They should have
been cleaned up as part of normal processing but for whatever reason, they were
not. Usually these are dessicated directories with nothing in them but
sometimes they might have an hfile or two. They could have content in
recovered.edits directory too.
The "HBCK Report" page outline how to run the bulk load tool. This will pick up
any hfiles in the 'Orphan Region' if there is worry that they have been dropped
mistakenly.
For the content under 'recovered.edits', the WALPlayer has just been adjusted
so it can pick up this content (See over in HBASE-22976).
The 'adoption service' would be run over an orphan region and it would apply
the 'bulk load' if hfiles found and the WALPlayer if 'recovered.edits' found...
it would then clean up the region directory on successful load after leaving
audit so the 'orphan' was cleaned-up.
hbck2 tool would run the adoption service at first. Once we had some experience
and confidence that the adoption service was running smoothly, we'd consider
integrating it into the catalogjanitor.
The 'adoption service' first gets mention in the body of HBASE-21745
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