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From "Siying Dong (JIRA)" <>
Subject [jira] Commented: (HIVE-1638) convert commonly used udfs to generic udfs
Date Wed, 29 Sep 2010 19:21:34 GMT


Siying Dong commented on HIVE-1638:

I should have made it clearer.

"CPU Cycle (MapRed Framework)" is the "CPU_MILLISECONDS" reported in "Map-Reduce Framework"
section of job page.

"Total CPU Time (hmon)" is not the query execution time. It is the average time the query
takes the cluster. It aggregates resource usage this job takes on each machine and normalized
by the total resource of the cluster (this one specifically should be number of cores). It
also includes reducer's costs. It's trend should be very similar to the first one, just another

> convert commonly used udfs to generic udfs
> ------------------------------------------
>                 Key: HIVE-1638
>                 URL:
>             Project: Hadoop Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Namit Jain
>            Assignee: Siying Dong
>         Attachments: HIVE-1638.1.patch
> Copying a mail from Joy:
> i did a little bit of profiling of a simple hive group by query today. i was surprised
to see that one of the most expensive functions were in converting the equals udf (i had some
simple string filters) to generic udfs. (primitiveobjectinspectorconverter.textconverter)
> am i correct in thinking that the fix is to simply port some of the most popular udfs
(string equality/comparison etc.) to generic udsf?

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