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Posted to dev@hive.apache.org by "Hive QA (JIRA)" <ji...@apache.org> on 2013/10/21 17:35:42 UTC
[jira] [Commented] (HIVE-3972) Support using multiple reducer for
fetching order by results
[ https://issues.apache.org/jira/browse/HIVE-3972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13800736#comment-13800736 ]
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/12609386/D8349.5.patch
{color:red}ERROR:{color} -1 due to 1 failed/errored test(s), 4429 tests executed
*Failed tests:*
{noformat}
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_fetch_aggregation
{noformat}
Test results: https://builds.apache.org/job/PreCommit-HIVE-Build/1182/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/1182/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, 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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