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From "Yuntao Jia (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-396) Hive performance benchmarks
Date Fri, 07 Aug 2009 07:05:16 GMT

    [ https://issues.apache.org/jira/browse/HIVE-396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12740431#action_12740431

Yuntao Jia commented on HIVE-396:

Can you check how many jobs are there in the Hive query? If there are two, it means the output
from Hive are merged to a single file by running an additional map-reduce job. If that is
the case, you can turn it off by change the following property in Hive-default.xml to FALSE
(it is true by default).

hive.merge.mapfiles true 
"Merge small files at the end of a map-only job"

Other than that, I have no idea why Hive is so slow. 

> Hive performance benchmarks
> ---------------------------
>                 Key: HIVE-396
>                 URL: https://issues.apache.org/jira/browse/HIVE-396
>             Project: Hadoop Hive
>          Issue Type: New Feature
>            Reporter: Zheng Shao
>            Assignee: Yuntao Jia
>         Attachments: hive_benchmark_2009-06-18.pdf, hive_benchmark_2009-06-18.tar.gz,
hive_benchmark_2009-07-12.pdf, hive_benchmark_2009-07-21.tar.gz
> We need some performance benchmark to measure and track the performance improvements
of Hive.
> Some references:
> PIG performance benchmarks PIG-200
> PigMix: http://wiki.apache.org/pig/PigMix

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