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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-3972) Support using multiple reducer for fetching order by results
Date Thu, 24 Oct 2013 00:42:43 GMT

    [ https://issues.apache.org/jira/browse/HIVE-3972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13803618#comment-13803618
] 

Hive QA commented on HIVE-3972:
-------------------------------



{color:red}Overall{color}: -1 at least one tests failed

Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12609781/D8349.7.patch

{color:red}ERROR:{color} -1 due to 1 failed/errored test(s), 4471 tests executed
*Failed tests:*
{noformat}
org.apache.hadoop.hive.cli.TestNegativeCliDriver.testNegativeCliDriver_script_broken_pipe1
{noformat}

Test results: https://builds.apache.org/job/PreCommit-HIVE-Build/1210/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/1210/console

Messages:
{noformat}
Executing org.apache.hive.ptest.execution.PrepPhase
Executing org.apache.hive.ptest.execution.ExecutionPhase
Executing org.apache.hive.ptest.execution.ReportingPhase
Tests failed with: TestsFailedException: 1 tests failed
{noformat}

This message is automatically generated.

> Support using multiple reducer for fetching order by results
> ------------------------------------------------------------
>
>                 Key: HIVE-3972
>                 URL: https://issues.apache.org/jira/browse/HIVE-3972
>             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.D8349.1.patch,
HIVE-3972.D8349.2.patch, HIVE-3972.D8349.3.patch, HIVE-3972.D8349.4.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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