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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-6795) Update the document for JobConf#setNumReduceTasks
Date Mon, 31 Oct 2016 08:54:59 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6795?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15621653#comment-15621653
] 

Hadoop QA commented on MAPREDUCE-6795:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m 23s {color} | {color:blue}
Docker mode activated. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green} 0m 0s {color} | {color:green}
The patch does not contain any @author tags. {color} |
| {color:red}-1{color} | {color:red} test4tests {color} | {color:red} 0m 0s {color} | {color:red}
The patch doesn't appear to include any new or modified tests. Please justify why no new tests
are needed for this patch. Also please list what manual steps were performed to verify this
patch. {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 6m 42s {color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 23s {color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 17s {color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 0m 28s {color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 13s {color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 0m 47s {color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 21s {color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m 22s {color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 20s {color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 20s {color} | {color:green}
the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 14s {color}
| {color:green} hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core:
The patch generated 0 new + 90 unchanged - 1 fixed = 90 total (was 91) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 0m 25s {color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 11s {color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green} 0m 0s {color}
| {color:green} The patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 0m 51s {color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 19s {color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 2m 41s {color} | {color:green}
hadoop-mapreduce-client-core in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 15s {color}
| {color:green} The patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 15m 48s {color} | {color:black}
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:9560f25 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12836127/MAPREDUCE-6795.001.patch
|
| JIRA Issue | MAPREDUCE-6795 |
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  unit  findbugs
 checkstyle  |
| uname | Linux 67014b80dade 3.13.0-95-generic #142-Ubuntu SMP Fri Aug 12 17:00:09 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / f646fe3 |
| Default Java | 1.8.0_101 |
| findbugs | v3.0.0 |
|  Test Results | https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6788/testReport/
|
| modules | C: hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core
U: hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core |
| Console output | https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6788/console |
| Powered by | Apache Yetus 0.3.0   http://yetus.apache.org |


This message was automatically generated.



> Update the document for JobConf#setNumReduceTasks
> -------------------------------------------------
>
>                 Key: MAPREDUCE-6795
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6795
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: documentation
>            Reporter: Akira Ajisaka
>            Assignee: Yiqun Lin
>         Attachments: MAPREDUCE-6795.001.patch
>
>
> The following document is for MRv1. We should update the document for MapReduce on YARN.
> {code:title=JobConf.java}
>    * <b id="NoOfReduces">How many reduces?</b>
>    * 
>    * <p>The right number of reduces seems to be <code>0.95</code> or

>    * <code>1.75</code> multiplied by (&lt;<i>no. of nodes</i>&gt;
* 
>    * <a href="{@docRoot}/../mapred-default.html#mapreduce.tasktracker.reduce.tasks.maximum">
>    * mapreduce.tasktracker.reduce.tasks.maximum</a>).
>    * </p>
> {code}



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