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Date: Thu, 11 Feb 2016 09:52:18 +0000 (UTC)
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 <JIRA.12935208.1454092213397@arcas>
Subject: [jira] [Commented] (HIVE-12963) LIMIT statement with SORT BY
 creates additional MR job with hardcoded only one reducer
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    [ https://issues.apache.org/jira/browse/HIVE-12963?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15142481#comment-15142481 ] 

Hive QA commented on HIVE-12963:
--------------------------------


Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12787156/HIVE-12963.4.patch

{color:green}SUCCESS:{color} +1 due to 5 test(s) being added or modified.

{color:red}ERROR:{color} -1 due to 14 failed/errored test(s), 9758 tests executed
*Failed tests:*
{noformat}
TestCliDriver-ppd_union.q-udf_var_samp.q-custom_input_output_format.q-and-12-more - did not produce a TEST-*.xml file
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_groupby1_limit
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_groupby_limit_extrastep
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_input_extrastep
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_input_limit_extrastep
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_limit_pushdown
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_limit_pushdown_extrastep
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.org.apache.hadoop.hive.cli.TestMiniTezCliDriver
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_dynamic_partition_pruning_2
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_limit_pushdown
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_schema_evol_orc_acidvec_mapwork_part
org.apache.hadoop.hive.cli.TestNegativeCliDriver.testNegativeCliDriver_authorization_uri_import
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver_limit_pushdown
org.apache.hive.jdbc.TestSSL.testSSLVersion
{noformat}

Test results: http://ec2-174-129-184-35.compute-1.amazonaws.com/jenkins/job/PreCommit-HIVE-TRUNK-Build/6940/testReport
Console output: http://ec2-174-129-184-35.compute-1.amazonaws.com/jenkins/job/PreCommit-HIVE-TRUNK-Build/6940/console
Test logs: http://ec2-174-129-184-35.compute-1.amazonaws.com/logs/PreCommit-HIVE-TRUNK-Build-6940/

Messages:
{noformat}
Executing org.apache.hive.ptest.execution.TestCheckPhase
Executing org.apache.hive.ptest.execution.PrepPhase
Executing org.apache.hive.ptest.execution.ExecutionPhase
Executing org.apache.hive.ptest.execution.ReportingPhase
Tests exited with: TestsFailedException: 14 tests failed
{noformat}

This message is automatically generated.

ATTACHMENT ID: 12787156 - PreCommit-HIVE-TRUNK-Build

> LIMIT statement with SORT BY creates additional MR job with hardcoded only one reducer
> --------------------------------------------------------------------------------------
>
>                 Key: HIVE-12963
>                 URL: https://issues.apache.org/jira/browse/HIVE-12963
>             Project: Hive
>          Issue Type: Bug
>          Components: Hive
>    Affects Versions: 1.0.0, 1.2.1, 0.13
>            Reporter: Alina Abramova
>            Assignee: Alina Abramova
>         Attachments: HIVE-12963.1.patch, HIVE-12963.2.patch, HIVE-12963.3.patch, HIVE-12963.4.patch
>
>
> I execute query:
> hive> select age from test1 sort by age.age  limit 10;                      
> Total jobs = 2
> Launching Job 1 out of 2
> Number of reduce tasks not specified. Estimated from input data size: 1
> Launching Job 2 out of 2
> Number of reduce tasks determined at compile time: 1
> When I have a large number of rows then the last stage of the job takes a long time. I think we could allow to user choose number of reducers of last job or refuse extra MR job.
> The same behavior I observed with querie:
> hive> create table new_test as select age from test1 group by age.age  limit 10;


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