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Posted to issues@hive.apache.org by "Sergey Zadoroshnyak (JIRA)" <ji...@apache.org> on 2016/02/05 13:02:39 UTC

[jira] [Commented] (HIVE-8188) ExprNodeGenericFuncEvaluator::_evaluate() loads class annotations in a tight loop

    [ https://issues.apache.org/jira/browse/HIVE-8188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15134050#comment-15134050 ] 

Sergey Zadoroshnyak commented on HIVE-8188:
-------------------------------------------

[~hagleitn]
[~prasanth_j]
[~thejas]

GenericUDAFEvaluator.isEstimable(agg) always returns false, because annotation AggregationType has default RetentionPolicy.CLASS and cannot  be  retained by the VM at run time.

As result estimate method will never be executed.

I am going to open new jira issue, if no objections

> 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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