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https://issues.apache.org/jira/browse/HBASE-18309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16434355#comment-16434355
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Hudson commented on HBASE-18309:
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Results for branch branch-1.4
        [build #284 on 
builds.a.o|https://builds.apache.org/job/HBase%20Nightly/job/branch-1.4/284/]: 
(x) *{color:red}-1 overall{color}*
----
details (if available):

(x) {color:red}-1 general checks{color}
-- For more information [see general 
report|https://builds.apache.org/job/HBase%20Nightly/job/branch-1.4/284//General_Nightly_Build_Report/]


(x) {color:red}-1 jdk7 checks{color}
-- For more information [see jdk7 
report|https://builds.apache.org/job/HBase%20Nightly/job/branch-1.4/284//JDK7_Nightly_Build_Report/]


(x) {color:red}-1 jdk8 hadoop2 checks{color}
-- For more information [see jdk8 (hadoop2) 
report|https://builds.apache.org/job/HBase%20Nightly/job/branch-1.4/284//JDK8_Nightly_Build_Report_(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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