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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4428) Redirect RM page to AHS page when AHS turned on and RM page is not avaialable
Date Thu, 28 Jan 2016 19:29:39 GMT

    [ https://issues.apache.org/jira/browse/YARN-4428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15122157#comment-15122157

Jason Lowe commented on YARN-4428:

Thanks for updating the patch!  Changes look good except this comment was not addressed:
The log statement should use the slf4j string formatting directives and pass the parts as
arguments rather than construct it explicitly
The patch is still constructing strings explicitly rather then let the slf4j formatting directives
do the work.

> Redirect RM page to AHS page when AHS turned on and RM page is not avaialable
> -----------------------------------------------------------------------------
>                 Key: YARN-4428
>                 URL: https://issues.apache.org/jira/browse/YARN-4428
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Chang Li
>            Assignee: Chang Li
>         Attachments: YARN-4428.1.2.patch, YARN-4428.1.patch, YARN-4428.2.2.patch, YARN-4428.2.patch,
YARN-4428.3.patch, YARN-4428.3.patch, YARN-4428.4.patch, YARN-4428.5.patch, YARN-4428.6.patch,
YARN-4428.7.patch, YARN-4428.8.patch
> When AHS is turned on, if we can't view application in RM page, RM page should redirect
us to AHS page. For example, when you go to cluster/app/application_1, if RM no longer remember
the application, we will simply get "Failed to read the application application_1", but it
will be good for RM ui to smartly try to redirect to AHS ui /applicationhistory/app/application_1
to see if it's there. The redirect usage already exist for logs in nodemanager UI.
> Also, when AHS is enabled, WebAppProxyServlet should redirect to AHS page on fall back
of RM not remembering the app. YARN-3975 tried to do this only when original tracking url
is not set. But there are many cases, such as when app failed at launch, original tracking
url will be set to point to RM page, so redirect to AHS page won't work.

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