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From "Vinod Kumar Vavilapalli (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1859) WebAppProxyServlet will throw ApplicationNotFoundException if the app is no longer cached in RM
Date Fri, 21 Mar 2014 01:58:44 GMT

    [ https://issues.apache.org/jira/browse/YARN-1859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13942655#comment-13942655
] 

Vinod Kumar Vavilapalli commented on YARN-1859:
-----------------------------------------------

Looks good, +1. Checking this in.

> WebAppProxyServlet will throw ApplicationNotFoundException if the app is no longer cached
in RM
> -----------------------------------------------------------------------------------------------
>
>                 Key: YARN-1859
>                 URL: https://issues.apache.org/jira/browse/YARN-1859
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Zhijie Shen
>            Assignee: Zhijie Shen
>         Attachments: YARN-1859.1.patch
>
>
> WebAppProxyServlet checks null to determine whether the application is not found or not.
> {code}
>  ApplicationReport applicationReport = getApplicationReport(id);
>       if(applicationReport == null) {
>         LOG.warn(req.getRemoteUser()+" Attempting to access "+id+
>             " that was not found");
> {code}
> 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.



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