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From "Navis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-8188) ExprNodeGenericFuncEvaluator::_evaluate() loads class annotations in a tight loop
Date Fri, 26 Sep 2014 00:30:33 GMT

    [ https://issues.apache.org/jira/browse/HIVE-8188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14148539#comment-14148539
] 

Navis commented on HIVE-8188:
-----------------------------

[~prasanth_j] The original patch didn't used annotation, but a reviewer wanted that to be
an annotation. So I've just replaced instanceOf to isEstimable(), not thinking deeper. Thing
had done like that. Still my bad.

> 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
>            Assignee: Gopal V
>              Labels: Performance
>             Fix For: 0.14.0
>
>         Attachments: HIVE-8188.1.patch, HIVE-8188.2.patch, 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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