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https://issues.apache.org/jira/browse/HADOOP-5578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12712699#action_12712699
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Amar Kamat commented on HADOOP-5578:
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I would rather go for an end to end test case which brings up jobtracker with 3 
different configs namely 
# hostname
# hostname:
# hostname:port

and test what hostname:port values are actually used. Wouldnt that work? Also I 
think Namenode does something similar. Cant we factor out this 
port(checking/adding) code?

> Add default port for jobtracker (mapred.job.tracker)
> ----------------------------------------------------
>
>                 Key: HADOOP-5578
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5578
>             Project: Hadoop Core
>          Issue Type: Improvement
>            Reporter: Aaron Kimball
>            Assignee: Aaron Kimball
>            Priority: Minor
>         Attachments: HADOOP-5578.patch
>
>
> HADOOP-3317 standardizes port 8020 as the default port for NameNode / HDFS 
> URIs. The mapred.job.tracker property has no such analogue.
> I propose specifying a default port of 8021 if no port-component is specified 
> in the user's mapred.job.tracker property.

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