Hudson commented on HBASE-18309:

Results for branch branch-1.4
        [build #284 on 
(x) *{color:red}-1 overall{color}*
details (if available):

(x) {color:red}-1 general checks{color}
-- For more information [see general 

(x) {color:red}-1 jdk7 checks{color}
-- For more information [see jdk7 

(x) {color:red}-1 jdk8 hadoop2 checks{color}
-- For more information [see jdk8 (hadoop2) 

(/) {color:green}+1 source release artifact{color}
-- See build output for details.

> Support multi threads in CleanerChore
> -------------------------------------
>                 Key: HBASE-18309
>                 URL: https://issues.apache.org/jira/browse/HBASE-18309
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: binlijin
>            Assignee: Reid Chan
>            Priority: Major
>             Fix For: 2.0.0-beta-1, 2.0.0
>         Attachments: HBASE-18309.addendum.patch, 
> HBASE-18309.branch-1.001.patch, HBASE-18309.branch-1.002.patch, 
> HBASE-18309.branch-1.003.patch, HBASE-18309.branch-1.004.patch, 
> HBASE-18309.branch-1.005.patch, HBASE-18309.branch-1.006.patch, 
> HBASE-18309.master.001.patch, HBASE-18309.master.002.patch, 
> HBASE-18309.master.004.patch, HBASE-18309.master.005.patch, 
> HBASE-18309.master.006.patch, HBASE-18309.master.007.patch, 
> HBASE-18309.master.008.patch, HBASE-18309.master.009.patch, 
> HBASE-18309.master.010.patch, HBASE-18309.master.011.patch, 
> HBASE-18309.master.012.patch, space_consumption_in_archive.png
> There is only one thread in LogCleaner to clean oldWALs and in our big 
> cluster we find this is not enough. The number of files under oldWALs reach 
> the max-directory-items limit of HDFS and cause region server crash, so we 
> use multi threads for LogCleaner and the crash not happened any more.
> What's more, currently there's only one thread iterating the archive 
> directory, and we could use multiple threads cleaning sub directories in 
> parallel to speed it up.

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