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https://issues.apache.org/jira/browse/YARN-3768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14573539#comment-14573539
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zhihai xu commented on YARN-3768:
---------------------------------

Hi [~joeferner], That is a good find. I can see the change at MAPREDUCE-5965 
may trigger this bug. I can take up this issue if you don't mind. thanks for 
reporting this issue.

> Index out of range exception with environment variables without values
> ----------------------------------------------------------------------
>
>                 Key: YARN-3768
>                 URL: https://issues.apache.org/jira/browse/YARN-3768
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: yarn
>    Affects Versions: 2.5.0
>            Reporter: Joe Ferner
>
> Looking at line 80 of org.apache.hadoop.yarn.util.Apps an index out of range 
> exception occurs if an environment variable is encountered without a value.
> I believe this occurs because java will not return empty strings from the 
> split method. Similar to this 
> http://stackoverflow.com/questions/14602062/java-string-split-removed-empty-values



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