hive-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-8188) ExprNodeGenericFuncEvaluator::_evaluate() loads class annotations in a tight loop
Date Fri, 26 Sep 2014 01:10:35 GMT

    [ https://issues.apache.org/jira/browse/HIVE-8188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14148581#comment-14148581
] 

Gopal V commented on HIVE-8188:
-------------------------------

[~navis]: No worries, took a special benchmark run to catch this.

I'm trying to catch anything that looks like a .14 regression before the RC goes out - the
UDF that hit this case was the NOW() UDF patch.

> 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!



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message