[HBASE-25281] Bulkload split hfile too many times due to unreasonable split point - ASF JIRA

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Details

Type: Improvement
Status: Resolved
Priority: Minor
Resolution: Fixed
Affects Version/s: None
Fix Version/s: 3.0.0-alpha-1, 2.4.0
Component/s: tooling
Labels:
None

Description

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