[YARN-2605] [RM HA] Rest api endpoints doing redirect incorrectly

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.4.0
• Fix Version/s: 2.8.0, 2.7.1, 3.0.0-alpha1
• Component/s: resourcemanager
• Labels: newbie
• Assignee: Xuan Gong
• Reporter: bc Wong
• Created: 25/Sep/14 18:40
• Updated: 09/Nov/18 21:24
• Resolved: 23/Apr/15 08:23

Description

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:

$ 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

Issue Links

• blocks: SLIDER-846 [RM HA] Slider Application Master url from RM UI complains "This is standby RM"
• is depended upon by: SLIDER-151 Implement full slider API in REST and switch client to it
• is depended upon by: YARN-2084 YARN to support REST APIs in AMs
• is duplicated by: YARN-4112 YARN HA secondary-RM/NM redirect not parseable by Ambari/curl in a Kerberoized deployment
• is related to: KNOX-1581 YARN v1 UI - Application - Node and logs links broken
• is related to: YARN-3601 Fix UT TestRMFailover.testRMWebAppRedirect
• is related to: YARN-3526 ApplicationMaster tracking URL is incorrectly redirected on a QJM cluster
• relates to: AMBARI-12995 Ambari alerts reports "UNKNOWN" error for secondary YARN RM and NM in a kerberoized YARN HA deployment
• relates to: YARN-3654 ContainerLogsPage web UI should not have meta-refresh
• relates to: YARN-3193 When visit standby RM webui, it will redirect to the active RM webui slowly.