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From "Hive QA (Jira)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-22538) RS deduplication does not always enforce hive.optimize.reducededuplication.min.reducer
Date Fri, 24 Jan 2020 16:25:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-22538?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17023072#comment-17023072
] 

Hive QA commented on HIVE-22538:
--------------------------------



Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12991714/HIVE-22538.6.patch

{color:green}SUCCESS:{color} +1 due to 2 test(s) being added or modified.

{color:green}SUCCESS:{color} +1 due to 17947 tests passed

Test results: https://builds.apache.org/job/PreCommit-HIVE-Build/20320/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/20320/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-20320/

Messages:
{noformat}
Executing org.apache.hive.ptest.execution.TestCheckPhase
Executing org.apache.hive.ptest.execution.PrepPhase
Executing org.apache.hive.ptest.execution.YetusPhase
Executing org.apache.hive.ptest.execution.ExecutionPhase
Executing org.apache.hive.ptest.execution.ReportingPhase
{noformat}

This message is automatically generated.

ATTACHMENT ID: 12991714 - PreCommit-HIVE-Build

> RS deduplication does not always enforce hive.optimize.reducededuplication.min.reducer
> --------------------------------------------------------------------------------------
>
>                 Key: HIVE-22538
>                 URL: https://issues.apache.org/jira/browse/HIVE-22538
>             Project: Hive
>          Issue Type: Bug
>          Components: Physical Optimizer
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Krisztian Kasa
>            Priority: Major
>              Labels: pull-request-available
>         Attachments: HIVE-22538.2.patch, HIVE-22538.3.patch, HIVE-22538.4.patch, HIVE-22538.5.patch,
HIVE-22538.6.patch, HIVE-22538.6.patch, HIVE-22538.patch
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> For transactional tables, that property might be overriden to 1, which can lead to merging
final aggregation into a single stage (hence leading to performance degradation). For instance,
when autogather column stats is enabled, this can happen for the following query:
> {code}
> set hive.support.concurrency=true;
> set hive.txn.manager=org.apache.hadoop.hive.ql.lockmgr.DbTxnManager;
> EXPLAIN
> CREATE TABLE x STORED AS ORC TBLPROPERTIES('transactional'='true') AS
> SELECT * FROM SRC x CLUSTER BY x.key;
> {code}



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