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Posted to common-issues@hadoop.apache.org by "Damien Hardy (JIRA)" <ji...@apache.org> on 2012/10/13 20:44:03 UTC

[jira] [Updated] (HADOOP-8922) Proviade alternate JSONP output for JMXJsonServlet to enable javascript in browser dashboard

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

Damien Hardy updated HADOOP-8922:
---------------------------------

                 Tags: jsonp metrics jmx
               Labels: newbie patch  (was: )
    Affects Version/s: 3.0.0
               Status: Patch Available  (was: Open)

Hi,

This is a small patch to provide an optional JSONP outpout. 
Just add a "callback=MyCallBack" paramater tu URL to get JSONP output.
I Think it could be applied to every version of Hadoop where the class is provided.

Cheers,
                
> 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
>    Affects Versions: 3.0.0
>            Reporter: Damien Hardy
>            Priority: Trivial
>              Labels: patch, newbie
>
> 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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