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Posted to issues@hbase.apache.org by "Nick Dimiduk (Jira)" <ji...@apache.org> on 2020/09/11 17:18:00 UTC

[jira] [Created] (HBASE-25015) PerformanceEvaluation with presplit randomWrite test has severe hotspotting

Nick Dimiduk created HBASE-25015:
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             Summary: PerformanceEvaluation with presplit randomWrite test has severe hotspotting
                 Key: HBASE-25015
                 URL: https://issues.apache.org/jira/browse/HBASE-25015
             Project: HBase
          Issue Type: Bug
          Components: test
    Affects Versions: 2.3.1
            Reporter: Nick Dimiduk


I'm attempting to apply a load to a small distributed cluster (12 RS). I use {{--presplit}} and specify 3 regions per region server. {{randomWrite}} test with {{--nomapred}} and 30 client threads. The result is severe hot-spotting on a single region region (10's of thousands of reqs/sec) and minimal load (high 10's to low 100's reqs/sec) to the others. It seems the split algorithm and the load generator do not agree on an even data distribution.



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