[jira] [Resolved] (HBASE-25281) Bulkload split hfile too many times due to unreasonable split point

["Guanghao Zhang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-25281?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Guanghao Zhang resolved HBASE-25281.
------------------------------------
    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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