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From "Damien Hardy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8922) Proviade alternate JSONP output for JMXJsonServlet to enable javascript in browser dashboard
Date Fri, 12 Oct 2012 18:11:03 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8922?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13475208#comment-13475208

Damien Hardy commented on HADOOP-8922:

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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