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https://issues.apache.org/jira/browse/MESOS-361?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13907786#comment-13907786
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Tobi Knaup commented on MESOS-361:
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":" breaks Java frameworks because the working dir becomes part of their 
CLASSPATH, which uses it as a separator.

> Restrict the character space of user provided identifiers.
> ----------------------------------------------------------
>
>                 Key: MESOS-361
>                 URL: https://issues.apache.org/jira/browse/MESOS-361
>             Project: Mesos
>          Issue Type: Bug
>            Reporter: Benjamin Mahler
>            Assignee: Dominic Hamon
>              Labels: newbie
>
> We need to restrict the character space of our identifiers.
>   -FrameworkID
>   -ExecutorID
>   -ExecutorInfo.source
>   -TaskID
> Using whitespace in these is messy, but using things like forward slashes 
> will break functionality!
> In particular, file system operations using the ids, as well as statistics 
> usage potentially.



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