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https://issues.apache.org/jira/browse/YARN-1915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14092949#comment-14092949
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Hadoop QA commented on YARN-1915:
---------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest 
attachment 
  http://issues.apache.org/jira/secure/attachment/12660996/YARN-1915v2.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author 
tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new 
or modified test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the 
total number of javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with 
eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new 
Findbugs (version 2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase 
the total number of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: 
https://builds.apache.org/job/PreCommit-YARN-Build/4586//testReport/
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/4586//console

This message is automatically generated.

> ClientToAMTokenMasterKey should be provided to AM at launch time
> ----------------------------------------------------------------
>
>                 Key: YARN-1915
>                 URL: https://issues.apache.org/jira/browse/YARN-1915
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>    Affects Versions: 2.2.0
>            Reporter: Hitesh Shah
>            Assignee: Jason Lowe
>            Priority: Critical
>         Attachments: YARN-1915.patch, YARN-1915v2.patch
>
>
> Currently, the AM receives the key as part of registration. This introduces a 
> race where a client can connect to the AM when the AM has not received the 
> key. 
> Current Flow:
> 1) AM needs to start the client listening service in order to get host:port 
> and send it to the RM as part of registration
> 2) RM gets the port info in register() and transitions the app to RUNNING. 
> Responds back with client secret to AM.
> 3) User asks RM for client token. Gets it and pings the AM. AM hasn't 
> received client secret from RM and so RPC itself rejects the request.



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