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From "Prasanth J (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-8188) ExprNodeGenericFuncEvaluator::_evaluate() loads class annotations in a tight loop
Date Fri, 19 Sep 2014 19:05:35 GMT

    [ https://issues.apache.org/jira/browse/HIVE-8188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14141099#comment-14141099
] 

Prasanth J commented on HIVE-8188:
----------------------------------

Looking at the attached PNG (GBY + Reflection), I thought its UDAF that uses reflection in
inner loop. Looks like many places needs improvement then. 

> ExprNodeGenericFuncEvaluator::_evaluate() loads class annotations in a tight loop
> ---------------------------------------------------------------------------------
>
>                 Key: HIVE-8188
>                 URL: https://issues.apache.org/jira/browse/HIVE-8188
>             Project: Hive
>          Issue Type: Bug
>          Components: UDF
>    Affects Versions: 0.14.0
>            Reporter: Gopal V
>         Attachments: udf-deterministic.png
>
>
> When running a near-constant UDF, most of the CPU is burnt within the VM trying to read
the class annotations for every row.
> !udf-deterministic.png!



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