[YARN-1859] WebAppProxyServlet will throw ApplicationNotFoundException if the app is no longer cached in RM

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.4.0
• Hadoop Flags: Reviewed
• Assignee: Zhijie Shen
• Reporter: Zhijie Shen
• Created: 20/Mar/14 21:23
• Updated: 10/Apr/14 13:12
• Resolved: 21/Mar/14 02:04

Description

WebAppProxyServlet checks null to determine whether the application is not found or not.

 ApplicationReport applicationReport = getApplicationReport(id);
      if(applicationReport == null) {
        LOG.warn(req.getRemoteUser()+" Attempting to access "+id+
            " that was not found");

However, WebAppProxyServlet calls AppReportFetcher, which consequently calls ClientRMService. When application is not found, ClientRMService throws ApplicationNotFoundException. Therefore, in WebAppProxyServlet, the following logic to create the tracking url for a non-cached app will no longer be in use.

Issue Links

• blocks: YARN-1863 TestRMFailover fails with 'AssertionError: null'
• is depended upon by: YARN-1809 Synchronize RM and Generic History Service Web-UIs
• is related to: YARN-1809 Synchronize RM and Generic History Service Web-UIs