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https://issues.apache.org/jira/browse/HBASE-20352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16433428#comment-16433428
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Yu Li commented on HBASE-20352:
-------------------------------

bq. In fact, i feel perplexed to address new comments when doing backport
It's common that new reviewers found new issues, and I think it's a good thing 
if code/doc truly improves with new comments. For old closed issues we could 
push addendum commits (for small changes) or open new JIRAs (for big changes), 
or in this case refine release note doc, don't worry (smile)

bq. And RN in HBASE-18398 has the documentation as Yu said
(HBASE-18309 actually) I think we should add some more words emphasizing the 
difference between 1 and 1.0 for {{hbase.cleaner.scan.dir.concurrent.size}}, 
which is missing in current RN. Thanks.

> [Chore] Backport HBASE-18309 to branch-1
> ----------------------------------------
>
>                 Key: HBASE-20352
>                 URL: https://issues.apache.org/jira/browse/HBASE-20352
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Reid Chan
>            Assignee: Reid Chan
>            Priority: Major
>         Attachments: HBASE-20352.branch-1.001.patch
>
>
> Using multiple threads to scan directory and to clean old WALs



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