[jira] [Created] (YARN-2605) [RM HA] Rest api endpoints doing redirect incorrectly

["bc Wong (JIRA)" <ji...@apache.org>]

bc Wong created YARN-2605:
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             Summary: [RM HA] Rest api endpoints doing redirect incorrectly
                 Key: YARN-2605
                 URL: https://issues.apache.org/jira/browse/YARN-2605
             Project: Hadoop YARN
          Issue Type: Bug
          Components: resourcemanager
    Affects Versions: 2.4.0
            Reporter: bc Wong


The standby RM's webui tries to do a redirect via meta-refresh. That is fine for pages designed to be viewed by web browsers. But the API endpoints shouldn't do that. Most programmatic HTTP clients do not do meta-refresh. I'd suggest HTTP 303, or return a well-defined error message (json or xml) stating that the standby status and a link to the active RM.

The standby RM is returning this today:
{noformat}
$ curl -i http://bcsec-1.ent.cloudera.com:8088/ws/v1/cluster/metrics
HTTP/1.1 200 OK
Cache-Control: no-cache
Expires: Thu, 25 Sep 2014 18:34:53 GMT
Date: Thu, 25 Sep 2014 18:34:53 GMT
Pragma: no-cache
Expires: Thu, 25 Sep 2014 18:34:53 GMT
Date: Thu, 25 Sep 2014 18:34:53 GMT
Pragma: no-cache
Content-Type: text/plain; charset=UTF-8
Refresh: 3; url=http://bcsec-2.ent.cloudera.com:8088/ws/v1/cluster/metrics
Content-Length: 117
Server: Jetty(6.1.26)

This is standby RM. Redirecting to the current active RM: http://bcsec-2.ent.cloudera.com:8088/ws/v1/cluster/metrics
{noformat}



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