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https://issues.apache.org/jira/browse/YARN-1321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13804206#comment-13804206
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Alejandro Abdelnur commented on YARN-1321:
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[~vinodkv], kind of agree with [~sandyr] on the extra config, we have been
pushing back on proliferation of very specific configs.
Also, it seems what you are proposing is pretty much what the last patch does,
with the difference that if you don't set the NMTokenCache explicitly you get
to use the singleton.
Also, in the latest patch the AMRMClient and the NMClient are not couple, you
could use direct protocol calls for one of them and the API for the other.
Finally, the latest patch does not break compatibility, not API, not behavior.
The patch is not touching MapReduce nor DistributedShell code any they
continue working as expected (with the singleton).
> 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
> Attachments: YARN-1321.patch, YARN-1321.patch, YARN-1321.patch,
> 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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