Dieter De Paepe created HBASE-28833:
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             Summary: BackupLogCleaner unsafe for multi-root backups
                 Key: HBASE-28833
                 URL: https://issues.apache.org/jira/browse/HBASE-28833
             Project: HBase
          Issue Type: Bug
          Components: backup&restore
            Reporter: Dieter De Paepe


The BackupLogCleaner is responsible for keeping WALs around that are not yet 
backed-up.

However, it does not keep track of multi-root backups. I.e. if there are 2 
backups roots R1 and R2, where R1 was backed up 1 week ago, and R2 today, the 
WALS needed for R1 could be deleted (= data loss in the R1 backups).



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