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From "Prasanth Jayachandran (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-13255) FloatTreeReader.nextVector is expensive
Date Wed, 30 Mar 2016 21:21:25 GMT

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

Prasanth Jayachandran updated HIVE-13255:
-----------------------------------------
    Attachment: HIVE-13255.2.patch

Updated readFloat and readDouble to honor InputStream read() contract.

> 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: HIVE-13255.1.patch, HIVE-13255.2.patch, bytecode-size-after.png,
bytecode-size-before.png, float-reader-perf.png, 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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