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From "Brock Noland (JIRA)" <>
Subject [jira] [Commented] (HIVE-3972) Support using multiple reducer for fetching order by results
Date Wed, 09 Apr 2014 03:55:22 GMT


Brock Noland commented on HIVE-3972:

Looks like the .out file contains a ^A or something:

diff --git ql/src/test/results/clientpositive/orderby_query_bucketing.q.out ql/src/test/results/clientpositive/orderby_query_bucketing.q.out
new file mode 100644
index 0000000..c02b1c9
Binary files /dev/null and ql/src/test/results/clientpositive/orderby_query_bucketing.q.out

> Support using multiple reducer for fetching order by results
> ------------------------------------------------------------
>                 Key: HIVE-3972
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Navis
>            Assignee: Navis
>            Priority: Minor
>         Attachments: D8349.5.patch, D8349.6.patch, D8349.7.patch, HIVE-3972.8.patch.txt,
HIVE-3972.9.patch.txt, HIVE-3972.D8349.1.patch, HIVE-3972.D8349.2.patch, HIVE-3972.D8349.3.patch,
> Queries for fetching results which have lastly "order by" clause make final MR run with
single reducer, which can be too much. For example, 
> {code}
> select value, sum(key) as sum from src group by value order by sum;
> {code}
> If number of reducer is reasonable, multiple result files could be merged into single
sorted stream in the fetcher level.

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