[jira] [Commented] (HADOOP-12466) MapReduce tutorial clarifications

["Akira AJISAKA (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-12466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14949742#comment-14949742 ] 

Akira AJISAKA commented on HADOOP-12466:
----------------------------------------

I'm thinking mapper implementations are passed to the job. Therefore this sentence can be rewritten as follows:
Overall, mapper implementations are passed to the job via Job.setMapperClass(Class) method.

> MapReduce tutorial clarifications
> ---------------------------------
>
>                 Key: HADOOP-12466
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12466
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: documentation
>            Reporter: chris snow
>
> 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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