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https://issues.apache.org/jira/browse/MAPREDUCE-3317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13140873#comment-13140873
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Ravi Gummadi commented on MAPREDUCE-3317:
-----------------------------------------

LoggedTaskAttempt.setHostName() has a minor bug. It is checking if 
this.rackName is null or not instead of checking the parameter rackName.
                
> Rumen TraceBuilder is emiting null as hostname
> ----------------------------------------------
>
>                 Key: MAPREDUCE-3317
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3317
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: tools/rumen
>    Affects Versions: 0.23.0
>            Reporter: Ravi Gummadi
>            Assignee: Ravi Gummadi
>
> Trace generated by Rumen TraceBuilder contains null as hostname even though 
> hostName and rackName are seen in history file. This is after MAPREDUCE-3035.

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