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https://issues.apache.org/jira/browse/HBASE-18547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16126637#comment-16126637
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Ted Yu commented on HBASE-18547:
--------------------------------

One potential solution is for cleaner chore to notify BackupLogCleaner which 
files have been successfully deleted.

BackupLogCleaner can respond and clean up related entries in backup table.

> Provide better cleanup of WAL related entries in backup table
> -------------------------------------------------------------
>
>                 Key: HBASE-18547
>                 URL: https://issues.apache.org/jira/browse/HBASE-18547
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Ted Yu
>
> I was discussing the design around incremental backup with Vladimir.
> Currently if WAL file is recorded in backup table, BackupLogCleaner would 
> signal that the file can be cleaned up.
> However, cleaner chore doesn't notify BackupLogCleaner whether the file is 
> actually deleted.
> This means that potentially large number of WAL file entries would stay in 
> backup table.
> This issue is to investigate better cleanup strategy for the WAL entries.



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