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https://issues.apache.org/jira/browse/YARN-1321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13799747#comment-13799747
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Alejandro Abdelnur commented on YARN-1321:
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We run into this issue in Llama. Llama is a single JVM hosting multiple
unmanaged ApplicationMasters that run at the same time (in parallel). Because
NMTokenCache is a singleton NMTokens for the same node from the different AMs
step on each other.
The patch that I'm working preserves the current behavior (singleton
NMTokenCache) while allowing a client to set a NMTokenCache instance to the
AMRMClient/NMClient (and Async versions). If an instance is set, then the
NMTokens are stored in it instead of the singleton. This preserves backward
compatibility both in behavior and in API.
> 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
>
>
> 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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