[jira] [Commented] (YARN-1321) NMTokenCache is a a singleton, prevents multiple AMs running in a single JVM to work correctly

[Alejandro Abdelnur (JIRA)]

    [ 
https://issues.apache.org/jira/browse/YARN-1321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13800028#comment-13800028
 ] 

Alejandro Abdelnur commented on YARN-1321:
------------------------------------------

[~hitesh], the changes would be restricted to 2 line changes:

  NMTokenCache.setNMToken(...);
  NMTokenCache.getNMToken(...);

for

  NMTokenCache.getSingleton().setNMToken()/getNMToken(...);
  NMTokenCache.getSingleton().getNMToken(...);

This is because I'm changing the {{NMTokenCache}} from static methods to 
instance methods. 


> NMTokenCache is a a singleton, prevents multiple AMs running in a single JVM 
> to work correctly
> ----------------------------------------------------------------------------------------------
>
>                 Key: YARN-1321
>                 URL: https://issues.apache.org/jira/browse/YARN-1321
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: client
>    Affects Versions: 2.2.0
>            Reporter: Alejandro Abdelnur
>            Assignee: Alejandro Abdelnur
>            Priority: Blocker
>             Fix For: 2.2.1
>
>         Attachments: YARN-1321.patch
>
>
> NMTokenCache is a singleton. Because of this, if running multiple AMs in a 
> single JVM NMTokens for the same node from different AMs step on each other 
> and starting containers fail due to mismatch tokens.
> The error observed in the client side is something like:
> {code}
> ERROR org.apache.hadoop.security.UserGroupInformation: 
> PriviledgedActionException as:llama (auth:PROXY) via llama (auth:SIMPLE) 
> cause:org.apache.hadoop.yarn.exceptions.YarnException: Unauthorized request 
> to start container. 
> NMToken for application attempt : appattempt_1382038445650_0002_000001 was 
> used for starting container with container token issued for application 
> attempt : appattempt_1382038445650_0001_000001
> {code}



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