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https://issues.apache.org/jira/browse/HBASE-18309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16247212#comment-16247212
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Yu Li commented on HBASE-18309:
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bq. New simulation first creates 10 dirs under oldWALs...
Thanks for the additional testing, I think the screenshot I pasted could
further explain why we need the sorting.
bq. Do you think it is ok to borrow the idea of HFileCleaner? Or a general way
would work?
I think we don't need to separate large/small threads for wals since their
rolling size is unified, a general multi-thread way would work.
And good to know the progress, good job [~reidchan].
> Support multi threads in CleanerChore
> -------------------------------------
>
> Key: HBASE-18309
> URL: https://issues.apache.org/jira/browse/HBASE-18309
> Project: HBase
> Issue Type: Improvement
> Components: wal
> Reporter: binlijin
> Assignee: Reid Chan
> Attachments: HBASE-18309.master.001.patch,
> HBASE-18309.master.002.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.
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