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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18309) Support multi threads in CleanerChore
Date Thu, 28 Dec 2017 04:02:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16305035#comment-16305035
] 

stack commented on HBASE-18309:
-------------------------------

[~reidchan] It runs too often and the spew in a big cluster is profuse. I don't think we should
log a message unless there is an error. I'm trying to figure whey we get the "Couldn't delete...
" messages. If not an error, I'll suppress these lines too.

Running w/ all the CPUs in the machine verges on the abusive don't you think? Should we do
less.  1/4? 1/8th?

Thanks

> 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
>             Fix For: 3.0.0, 2.0.0-beta-1
>
>         Attachments: HBASE-18309.addendum.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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