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Posted to common-issues@hadoop.apache.org by "Harsh J (JIRA)" <ji...@apache.org> on 2012/10/12 18:37:04 UTC
[jira] [Commented] (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:comment-tabpanel&focusedCommentId=13475131#comment-13475131 ]
Harsh J commented on HADOOP-8922:
---------------------------------
Hi Damien,
So this would allow folks to build own applications and pull in metrics in an easier manner (via JS)?
The policy you link to, is that a proper standard across major browsers, or otherwise?
Would you be working on a patch to allow this and perhaps post a demonstration use-case for supporting its addition?
Thanks a ton!
> 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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