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https://issues.apache.org/jira/browse/HADOOP-13628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15513464#comment-15513464
 ] 

Weiwei Yang commented on HADOOP-13628:
--------------------------------------

Hello [~ste...@apache.org]

# I have created HADOOP-13639 for the plain text stuff.
# For the 404 error, use following command

{code}
curl --header "Accept:application/json" 
http://deale1.fyre.ibm.com:8088/conf?name=xxx
{code}

you will get following output

{code}
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"/>
<title>Error 404 Property xxx not found</title>
</head>
<body><h2>HTTP ERROR 404</h2>
<p>Problem accessing /conf. Reason:
<pre>    Property xxx not found</pre></p><hr /><i><small>Powered by 
Jetty://</small></i><br/>
</br>
...
</body>
</html>
{code}

from browser, you'll get error like screen shot [^404_error_browser.png]

> Support to retrieve specific property from configuration via REST API
> ---------------------------------------------------------------------
>
>                 Key: HADOOP-13628
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13628
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: conf
>    Affects Versions: 2.7.3
>            Reporter: Weiwei Yang
>            Assignee: Weiwei Yang
>         Attachments: 404_error_browser.png, HADOOP-13628.01.patch, 
> HADOOP-13628.02.patch, HADOOP-13628.03.patch, HADOOP-13628.04.patch
>
>
> Currently we can use rest API to retrieve all configuration properties per 
> daemon, but unable to get a specific property by name. This causes extra 
> parse work at client side when dealing with Hadoop configurations, and also 
> it's quite over head to send all configuration in a http response over 
> network. Propose to support following a {{name}} parameter in the http 
> request, by issuing
> {code}
> curl --header "Accept:application/json" 
> http://${RM_HOST}/conf?name=yarn.nodemanager.aux-services
> {code}
> get output
> {code}
> {"property"{"key":"yarn.resourcemanager.hostname","value":"${RM_HOST}","isFinal":false,"resource":"yarn-site.xml"}}
> {code}
> This change is fully backwards compatible.



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