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https://issues.apache.org/jira/browse/HADOOP-8922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13475208#comment-13475208
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Damien Hardy commented on HADOOP-8922:
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Hi Harsh,
Yes it allows to load a page with some JS pulling periodicly data as json to
elaborate living graphs for exemple.
Also Yes :) it is described in more generic sources :
* http://www.w3.org/Security/wiki/Same_Origin_Policy
* http://en.wikipedia.org/wiki/Same_origin_policy
I can try to make some patch (I am more an admin than a dev profile) but should
be quite simple and I would love to have my name in hadoop-common changelog :D
> Proviade alternate JSONP output for JMXJsonServlet to enable javascript in
> browser dashboard
> --------------------------------------------------------------------------------------------
>
> Key: HADOOP-8922
> URL: https://issues.apache.org/jira/browse/HADOOP-8922
> Project: Hadoop Common
> Issue Type: Improvement
> Components: metrics
> Reporter: Damien Hardy
> Priority: Trivial
>
> JMXJsonServlet may provide a JSONP alternative to JSON to allow javascript in
> browser GUI to make requests.
> For security purpose about XSS, browser limit request on other
> domain[¹|#ref1] so that metrics from cluster nodes cannot be used in a full
> js interface.
> An example of this kind of dashboard is the bigdesk[²|#ref2] plugin for
> ElasticSearch.
> In order to achieve that the servlet should detect a GET parameter
> (callback=xxxx) and modify the response by surrounding the Json value with
> "xxxx(" and ");" [³|#ref3]
> value "xxxx" is variable and should be provide by client as callback
> parameter value.
> {anchor:ref1}[1]
> https://developer.mozilla.org/en-US/docs/Same_origin_policy_for_JavaScript
> {anchor:ref2}[2] https://github.com/lukas-vlcek/bigdesk
> {anchor:ref3}[3] http://en.wikipedia.org/wiki/JSONP
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