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

     [ https://issues.apache.org/jira/browse/HIVE-13255?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Prasanth Jayachandran updated HIVE-13255:
-----------------------------------------
    Attachment: q1-warm-perf-map.png
                q1-bottleneck.png

> 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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