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https://issues.apache.org/jira/browse/HADOOP-3437?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12599331#action_12599331
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Steve Loughran commented on HADOOP-3437:
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I should add that this is a change since 0.16.3; so "local" used to be valid. A 
new default value/comment string is probably appropriate

> mapred.job.tracker default value/docs appear out of sync with code
> ------------------------------------------------------------------
>
>                 Key: HADOOP-3437
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3437
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: conf
>    Affects Versions: 0.18.0
>            Reporter: Steve Loughran
>            Priority: Minor
>
> This is the settings for mapred.job.tracker in SVN_HEAD. If you dont override 
> these, you get a RuntimeException
> <property>
>   <name>mapred.job.tracker</name>
>   <value>local</value>
>   <description>The host and port that the MapReduce job tracker runs
>   at.  If "local", then jobs are run in-process as a single map
>   and reduce task.
>   </description>
> </property>

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