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On a 2.2 HBase cluster we just hit the very same "HBCK2 assigns" issue already fixed in HBASE-24885. This improvement would be very useful on branch-2.2 too. I'll submit a PR soon.
[HBCK2] New check to prevent assign of already opened regions
STUCK RIT by hbck2 assigns
Github Pull Request with the backport: #2989 (original PR was: #2989)