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From "Prasanth Jayachandran (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-13255) FloatTreeReader.nextVector is expensive
Date Thu, 10 Mar 2016 01:41:40 GMT
Prasanth Jayachandran created HIVE-13255:
--------------------------------------------

             Summary: FloatTreeReader.nextVector is expensive 
                 Key: HIVE-13255
                 URL: https://issues.apache.org/jira/browse/HIVE-13255
             Project: Hive
          Issue Type: Bug
          Components: ORC
    Affects Versions: 2.1.0
            Reporter: Prasanth Jayachandran
            Assignee: Prasanth Jayachandran
         Attachments: q1-bottleneck.png, q1-warm-perf-map.png

Some TPCDS queries on 1TB scale shows FloatTreeReader on profile samples. It is most likely
because of multiple branching and polymorphic dispatch in FloatTreeReader.nextVector() implementation.
See attached image for sampling profile output.



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