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https://issues.apache.org/jira/browse/HADOOP-2325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12600964#action_12600964
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Tsz Wo (Nicholas), SZE commented on HADOOP-2325:
------------------------------------------------

Hudson indeed uses Java 1.5 since it cannot compile hadoop now.  See 
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2522/artifact/trunk/current/trunkJavacWarnings.txt

> Require Java 6
> --------------
>
>                 Key: HADOOP-2325
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2325
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: build
>            Reporter: Doug Cutting
>            Assignee: Doug Cutting
>             Fix For: 0.18.0
>
>         Attachments: HADOOP-2325.patch
>
>
> We should require Java 6 for release 0.17.  Java 6 is now available for OS/X. 
>  Hadoop performs much better on Java 6.  And, finally, there are features of 
> Java 6 (like 'df') that would be nice to use.

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