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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13628) Support to retrieve specific property from configuration via REST API
Date Tue, 20 Sep 2016 19:43:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15507590#comment-15507590

Steve Loughran commented on HADOOP-13628:

I like this too. Does it return the fully evaluated config?

* JSON examples in javadoc should be wrapped in <pre> blocks
* Unknown properties should return 404. This is a rest API, not a SOAP one where the result
is hidden in the body.
* Could we have a text/plain one which returns just the text value? I could have some fun
there. For example, it could be pulled straight into google sheets.
* We need a functional test for this. Presumably a MiniHDFS cluster serves up this data and
would respond to a few Jersey requests?

> 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: HADOOP-13628.01.patch, HADOOP-13628.02.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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