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https://issues.apache.org/jira/browse/YARN-1399?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13839211#comment-13839211
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Robert Kanter commented on YARN-1399:
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{quote}
I am tempted to accept all unicode strings to begin with, and add restrictions
if we really need them. In this particular case of <h1>MapReduce</h1>, I think
we should show the user what he wants to see - it might not look good or
consistent with rest of the page, but that is what the user wanted. No?
{quote}
It's generally a bad idea to not escape freeform user text when displaying it
on a page; while {{<h1>MapReduce</h1>}} is harmless, users could try to come up
with more malicious things...
> Allow users to annotate an application with multiple tags
> ---------------------------------------------------------
>
> Key: YARN-1399
> URL: https://issues.apache.org/jira/browse/YARN-1399
> Project: Hadoop YARN
> Issue Type: Improvement
> Reporter: Zhijie Shen
> Assignee: Zhijie Shen
>
> Nowadays, when submitting an application, users can fill the applicationType
> field to facilitate searching it later. IMHO, it's good to accept multiple
> tags to allow users to describe their applications in multiple aspects,
> including the application type. Then, searching by tags may be more efficient
> for users to reach their desired application collection. It's pretty much
> like the tag system of online photo/video/music and etc.
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