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Posted to dev@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2015/03/19 20:39:38 UTC

[jira] [Created] (HBASE-13291) Lift the scan ceiling

stack created HBASE-13291:
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             Summary: Lift the scan ceiling
                 Key: HBASE-13291
                 URL: https://issues.apache.org/jira/browse/HBASE-13291
             Project: HBase
          Issue Type: Improvement
          Components: Scanners
    Affects Versions: 1.0.0
            Reporter: stack
            Assignee: stack


Scanning medium sized rows with multiple concurrent scanners exhibits interesting 'ceiling' properties. A server runs at about 6.7k ops a second using 450% of possible 1600% of CPUs  when 4 clients each with 10 threads doing scan 1000 rows.  If I add '--filterAll' argument (do not return results), then we run at 1450% of possible 1600% possible but we do 8k ops a second.

Let me attach flame graphs for two cases. Unfortunately, there is some frustrating dark art going on. Let me try figure it... Filing issue in meantime to keep score in.



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