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https://issues.apache.org/jira/browse/HBASE-18309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16072141#comment-16072141
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Yu Li commented on HBASE-18309:
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Personally I think supplying a way to accelerate oldWAL clean speed is nice to
have, even with HBASE-14247 implemented. Let's make it support online
configuration change and set the default thread number to 1.
> Support multi threads to clean oldWALs
> --------------------------------------
>
> Key: HBASE-18309
> URL: https://issues.apache.org/jira/browse/HBASE-18309
> Project: HBase
> Issue Type: Improvement
> Reporter: binlijin
>
> 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.
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