[ 
http://issues.apache.org/jira/browse/HADOOP-327?page=comments#action_12420348 ] 

Doug Cutting commented on HADOOP-327:
-------------------------------------

But at issue here is not a particular main(), but an interface for main()-like 
methods.  So we cannot know which specific exceptions might be thrown.

> ToolBase calls System.exit
> --------------------------
>
>          Key: HADOOP-327
>          URL: http://issues.apache.org/jira/browse/HADOOP-327
>      Project: Hadoop
>         Type: Bug

>   Components: util
>     Versions: 0.4.0
>     Reporter: Owen O'Malley
>     Assignee: Hairong Kuang
>      Fix For: 0.5.0
>  Attachments: exit.patch
>
> The new ToolBase class calls System.exit when the main routine finishes. That 
> will break if the application uses threads that need to finish before the jvm 
> exits. The normal semantics is that the program doesn't finish execution 
> until all of the non-daemon threads exit (including the main one) and 
> System.exit should never be called except for critical errors.

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