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https://issues.apache.org/jira/browse/HBASE-25281?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guanghao Zhang resolved HBASE-25281.
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Fix Version/s: 2.4.0
3.0.0-alpha-1
Resolution: Fixed
Pushed to branch-2 and master. Thanks [~niuyulin] for contributing.
> Bulkload split hfile too many times due to unreasonable split point
> -------------------------------------------------------------------
>
> Key: HBASE-25281
> URL: https://issues.apache.org/jira/browse/HBASE-25281
> Project: HBase
> Issue Type: Improvement
> Components: tooling
> Reporter: niuyulin
> Assignee: niuyulin
> Priority: Minor
> Fix For: 3.0.0-alpha-1, 2.4.0
>
> Attachments: bulkload.png
>
>
> [https://github.com/apache/hbase/blob/master/hbase-server/src/main/java/org/apache/hadoop/hbase/tool/BulkLoadHFilesTool.java#L688]
> if hfile span multi regions, for example A,B,C,D,E,F(the start key of these
> regions are in ascending order), we should use region C endkey to split, not
> region A. In this way, we can get equal .top and .bottom hfiles, reduce time
> complexity of split from O( n ) to O(logn),decrease invoke of {{bulkLoad}}
> rpc to regionserver ,and also avoid write amplification during
> {{copyHFileHalf}}
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