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https://issues.apache.org/jira/browse/HBASE-21867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16773920#comment-16773920
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Toshihiro Suzuki commented on HBASE-21867:
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Pushed [^HBASE-21867.branch-2.001.patch] to branch-2 and branch-2.2.
> Support multi-threads in HFileArchiver
> --------------------------------------
>
> Key: HBASE-21867
> URL: https://issues.apache.org/jira/browse/HBASE-21867
> Project: HBase
> Issue Type: Improvement
> Reporter: Toshihiro Suzuki
> Assignee: Toshihiro Suzuki
> Priority: Major
> Fix For: 3.0.0
>
> Attachments: HBASE-21867.branch-2.001.patch,
> HBASE-21867.master.001.patch, HBASE-21867.master.002.patch,
> HBASE-21867.master.002.patch, HBASE-21867.master.003.patch,
> HBASE-21867.master.004.patch
>
>
> As of now, when deleting a table, we do the following regarding the
> filesystem layout:
> 1. Move the table data to the temp directory (hbase/.tmp)
> 2. Archive the region directories of the table in the temp directory one by
> one:
> https://github.com/apache/hbase/blob/b322d0a3e552dc228893408161fd3fb20f6b8bf1/hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/DeleteTableProcedure.java#L319-L323
> However, step 2 will take a long time when the table has a huge number of
> regions. So I propose doing step 2 in multi-threads in this Jira.
> Also, during master startup, we do the same process as step 2:
> https://github.com/apache/hbase/blob/b322d0a3e552dc228893408161fd3fb20f6b8bf1/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterFileSystem.java#L313-L319
> We should make it multi-threaded, similarly.
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