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From "Zhijie Shen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-800) Clicking on an AM link for a running app leads to a HTTP 500
Date Thu, 13 Jun 2013 01:34:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-800?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13681838#comment-13681838
] 

Zhijie Shen commented on YARN-800:
----------------------------------

Did a quick local test, and found the link was not broken. It seems that the default value
has already been in yarn-default.xml
{code}
  <property>
    <description>The hostname of the RM.</description>
    <name>yarn.resourcemanager.hostname</name>
    <value>0.0.0.0</value>
  </property> 
{code}

{code}
  <property>
    <description>The address of the RM web application.</description>
    <name>yarn.resourcemanager.webapp.address</name>
    <value>${yarn.resourcemanager.hostname}:8088</value>
  </property>
{code}

and YarnConfiguration

{code}
  public static final String RM_WEBAPP_ADDRESS = 
    RM_PREFIX + "webapp.address";

  public static final int DEFAULT_RM_WEBAPP_PORT = 8088;
  public static final String DEFAULT_RM_WEBAPP_ADDRESS = "0.0.0.0:" +
    DEFAULT_RM_WEBAPP_PORT;
{code}

Looked into the code, it seems to be related to "yarn.web-proxy.address". In WebAppProxyServlet,

{code}
      resp.setStatus(client.executeMethod(config, method));
{code}

tries to connect the proxy host to show the application webpage. If "yarn.web-proxy.address"
is not set, RM will become the proxy, and its address will be $\{yarn.resourcemanager.hostname\}:8088
as well.

Maybe it is good to check the configuration of "yarn.web-proxy.address"
                
> Clicking on an AM link for a running app leads to a HTTP 500
> ------------------------------------------------------------
>
>                 Key: YARN-800
>                 URL: https://issues.apache.org/jira/browse/YARN-800
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.1.0-beta
>            Reporter: Arpit Gupta
>            Priority: Critical
>
> Clicking the AM link tries to open up a page with url like
> http://hostname:8088/proxy/application_1370886527995_0645/
> and this leads to an HTTP 500

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