Reid Chan updated HBASE-20352:
    Release Note: 
After HBASE-20352,
1. we could use multiple threads to scan archive directories (including data 
and oldWALs) through config hbase.cleaner.scan.dir.concurrent.size, which 
supports both integer (meaning the concrete size, but no more than available 
cpu cores) and double (between >0.0 and <=1.0, meaning ratio of available cpu 
cores) value, 0.25 by default. Pay attention that 1.0 is different from 1, the 
former indicates it will use 100% of cores, while the latter will use only 1 
thread for chore to scan dir. 
2. We also support using multiple threads to clean wals under oldWALs directory 
through hbase.oldwals.cleaner.thread.size, 2 by default.
3. In addition, hbase.cleaner.scan.dir.concurrent.size and 
hbase.oldwals.cleaner.thread.size both support online re-configuration.

> [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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