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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-15796) HoS: poor reducer parallelism when operator stats are not accurate
Date Wed, 08 Feb 2017 04:50:41 GMT

    [ https://issues.apache.org/jira/browse/HIVE-15796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15857394#comment-15857394
] 

Hive QA commented on HIVE-15796:
--------------------------------



Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12851528/HIVE-15796.1.patch

{color:red}ERROR:{color} -1 due to build exiting with an error

Test results: https://builds.apache.org/job/PreCommit-HIVE-Build/3429/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/3429/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-3429/

Messages:
{noformat}
Executing org.apache.hive.ptest.execution.TestCheckPhase
Executing org.apache.hive.ptest.execution.PrepPhase
Tests exited with: NonZeroExitCodeException
Command 'bash /data/hiveptest/working/scratch/source-prep.sh' failed with exit status 1 and
output '+ date '+%Y-%m-%d %T.%3N'
2017-02-08 04:50:23.401
+ [[ -n /usr/lib/jvm/java-8-openjdk-amd64 ]]
+ export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
+ JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
+ export PATH=/usr/lib/jvm/java-8-openjdk-amd64/bin/:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games
+ PATH=/usr/lib/jvm/java-8-openjdk-amd64/bin/:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games
+ export 'ANT_OPTS=-Xmx1g -XX:MaxPermSize=256m '
+ ANT_OPTS='-Xmx1g -XX:MaxPermSize=256m '
+ export 'MAVEN_OPTS=-Xmx1g '
+ MAVEN_OPTS='-Xmx1g '
+ cd /data/hiveptest/working/
+ tee /data/hiveptest/logs/PreCommit-HIVE-Build-3429/source-prep.txt
+ [[ false == \t\r\u\e ]]
+ mkdir -p maven ivy
+ [[ git = \s\v\n ]]
+ [[ git = \g\i\t ]]
+ [[ -z master ]]
+ [[ -d apache-github-source-source ]]
+ [[ ! -d apache-github-source-source/.git ]]
+ [[ ! -d apache-github-source-source ]]
+ date '+%Y-%m-%d %T.%3N'
2017-02-08 04:50:23.404
+ cd apache-github-source-source
+ git fetch origin
+ git reset --hard HEAD
HEAD is now at aa62dad HIVE-15840: Webhcat test TestPig_5 failing with Pig on Tez at check
for percent complete of job (Daniel Dai, reviewed by Thejas Nair)
+ git clean -f -d
Removing ql/src/test/queries/clientpositive/view_cbo.q
Removing ql/src/test/results/clientpositive/view_cbo.q.out
+ git checkout master
Already on 'master'
Your branch is up-to-date with 'origin/master'.
+ git reset --hard origin/master
HEAD is now at aa62dad HIVE-15840: Webhcat test TestPig_5 failing with Pig on Tez at check
for percent complete of job (Daniel Dai, reviewed by Thejas Nair)
+ git merge --ff-only origin/master
Already up-to-date.
+ date '+%Y-%m-%d %T.%3N'
2017-02-08 04:50:24.414
+ patchCommandPath=/data/hiveptest/working/scratch/smart-apply-patch.sh
+ patchFilePath=/data/hiveptest/working/scratch/build.patch
+ [[ -f /data/hiveptest/working/scratch/build.patch ]]
+ chmod +x /data/hiveptest/working/scratch/smart-apply-patch.sh
+ /data/hiveptest/working/scratch/smart-apply-patch.sh /data/hiveptest/working/scratch/build.patch
error: patch failed: common/src/java/org/apache/hadoop/hive/conf/HiveConf.java:2886
error: common/src/java/org/apache/hadoop/hive/conf/HiveConf.java: patch does not apply
error: patch failed: ql/src/test/results/clientpositive/spark/subquery_in.q.out:6260
error: ql/src/test/results/clientpositive/spark/subquery_in.q.out: patch does not apply
The patch does not appear to apply with p0, p1, or p2
+ exit 1
'
{noformat}

This message is automatically generated.

ATTACHMENT ID: 12851528 - PreCommit-HIVE-Build

> HoS: poor reducer parallelism when operator stats are not accurate
> ------------------------------------------------------------------
>
>                 Key: HIVE-15796
>                 URL: https://issues.apache.org/jira/browse/HIVE-15796
>             Project: Hive
>          Issue Type: Improvement
>          Components: Statistics
>    Affects Versions: 2.2.0
>            Reporter: Chao Sun
>            Assignee: Chao Sun
>         Attachments: HIVE-15796.1.patch, HIVE-15796.wip.1.patch, HIVE-15796.wip.2.patch,
HIVE-15796.wip.patch
>
>
> In HoS we use currently use operator stats to determine reducer parallelism. However,
it is often the case that operator stats are not accurate, especially if column stats are
not available. This sometimes will generate extremely poor reducer parallelism, and cause
HoS query to run forever. 
> This JIRA tries to offer an alternative way to compute reducer parallelism, similar to
how MR does. Here's the approach we are suggesting:
> 1. when computing the parallelism for a MapWork, use stats associated with the TableScan
operator;
> 2. when computing the parallelism for a ReduceWork, use the *maximum* parallelism from
all its parents.



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