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Jonathan Eagles commented on TEZ-3488: -------------------------------------- The Hadoop cross origin logic Access-Control-Allow-Origin is slightly different in this case https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/http/CrossOriginFilter.java#L105 compared to the manual composition of the tez cross origin logic https://github.com/apache/tez/blob/master/tez-dag/src/main/java/org/apache/tez/dag/app/web/AMWebController.java#L118 [~Sreenath], Could this be the cause of the issue? > Tez UI Vertex 404 > ----------------- > > Key: TEZ-3488 > URL: https://issues.apache.org/jira/browse/TEZ-3488 > Project: Apache Tez > Issue Type: Bug > Affects Versions: 0.8.4 > Reporter: George Liaw > > When we're trying to view vertices for a running job, the Vertex page will > show a 404 error saying: > "Could not retrieve expected data from @ <url>" > And the Vertex Counter page will show: > "Counters unavailable" > and > "Error code: Unknown, message: Resource Manager (RM) out of reach. Either > it's down or CORS is not enabled" > The RMs are up and CORS is enabled. If we go to the displayed url, we get the > expected XML with the application info. When the DAG finishes running, those > errors go away and the pages display fine. Any idea what's going on here? -- This message was sent by Atlassian JIRA (v6.3.4#6332)