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From "Damien Hardy (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8922) Proviade alternate JSONP output for JMXJsonServlet to enable javascript in browser dashboard
Date Fri, 12 Oct 2012 16:11:03 GMT
Damien Hardy created HADOOP-8922:
------------------------------------

             Summary: 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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