[jira] [Commented] (MAPREDUCE-6583) MapReduce tutorial clarifications

["Hadoop QA (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15065796#comment-15065796 ] 

Hadoop QA commented on MAPREDUCE-6583:
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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 1s {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:green}+1{color} | {color:green} mvnsite {color} | {color:green} 0m 33s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 0m 31s {color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} whitespace {color} | {color:red} 0m 0s {color} | {color:red} The patch has 81 line(s) that end in whitespace. Use git apply --whitespace=fix. {color} |
| {color:red}-1{color} | {color:red} asflicense {color} | {color:red} 0m 18s {color} | {color:red} Patch generated 1 ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 1m 33s {color} | {color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:0ca8df7 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12778660/HADOOP-12466.01.patch |
| JIRA Issue | MAPREDUCE-6583 |
| Optional Tests |  asflicense  mvnsite  |
| uname | Linux ec989ca2a3bf 3.13.0-36-lowlatency #63-Ubuntu SMP PREEMPT Wed Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 0f82b5d |
| whitespace | https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6222/artifact/patchprocess/whitespace-eol.txt |
| asflicense | https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6222/artifact/patchprocess/patch-asflicense-problems.txt |
| modules | C: hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core U: hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core |
| Max memory used | 29MB |
| Powered by | Apache Yetus 0.2.0-SNAPSHOT   http://yetus.apache.org |
| Console output | https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6222/console |


This message was automatically generated.



> MapReduce tutorial clarifications
> ---------------------------------
>
>                 Key: MAPREDUCE-6583
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6583
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: documentation
>            Reporter: chris snow
>            Assignee: Kai Sasaki
>         Attachments: HADOOP-12466.01.patch
>
>
> The current MapReduce tutorial has the following statement which is confusing:
> {quote}
> Overall, Mapper implementations are passed the Job for the job via the Job.setMapperClass(Class) method.
> {quote}
> The sentence seems to contradict itself.   The code shows the mapper getting passed to the job.  However, the working suggests that the job is passed to the mapper?
> https://hadoop.apache.org/docs/current/hadoop-mapreduce-client/hadoop-mapreduce-client-core/MapReduceTutorial.html#Mapper



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