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https://issues.apache.org/jira/browse/YARN-1399?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13839180#comment-13839180
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Zhijie Shen commented on YARN-1399:
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bq. I would stick to exact tag match. Case insensitive seems reasonable, though
I would implement it by lowercase or upper case tags on arrival and when
querying. Then the matching is the cheapest.
It's not just query, but may be related to the display as well. For example,
when showing a list of applications, it is not user-friendly to show the
applications are "MapReduce", others are "MAPREDUCE", "mapreduce" and so on.
And IMHO, the cheapest way may be converting the string to one case when
accepting it, because the app's meta-info is written once, but read multiple
times.
bq. Regarding symbols, what is the harm in supporting them?
I've no immediate idea about what the harm will be, and reasonable users will
seldom use these special chars. However, this constraint is what I feel when I
write the tags for my online album, bookmarks and etc. One possible problem I
can foresee is that users can write "<h1>MapReduce</h1>" to force the display
on the web page. Of course, we can escape the string before composing the html
file, but we need to take care of it.
bq. One thing we didn't mentioned before, on querying I would support only OR,
then the client must do any further filtering if it wants to do AND.
It's a good point. Or we can give an option to allow users to choose between
"AND" and "OR" logic?
In general, I've just raised a few issues that I've already in mind. However,
as users are free to write the tags (or the existing text meta-info of the
app), we should expect there will be more issues that we still haven't thought
about.
> 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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