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From "Robert Joseph Evans (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-8922) Provide alternate JSONP output for JMXJsonServlet to allow javascript in browser dashboard
Date Tue, 16 Oct 2012 21:43:05 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-8922?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Joseph Evans updated HADOOP-8922:
----------------------------------------

       Resolution: Fixed
    Fix Version/s: 2.0.3-alpha
                   3.0.0
           Status: Resolved  (was: Patch Available)
    
> Provide alternate JSONP output for JMXJsonServlet to allow javascript in browser dashboard
> ------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-8922
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8922
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: metrics
>    Affects Versions: 2.0.0-alpha
>            Reporter: Damien Hardy
>            Priority: Trivial
>              Labels: newbie, patch
>             Fix For: 3.0.0, 2.0.3-alpha
>
>         Attachments: HADOOP-8922-3.patch, HADOOP-8922-4-branch-2.patch, test.html
>
>
> 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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