Robert Joseph Evans created YARN-941:
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Summary: RM Should have a way to update the tokens it has for a
running application
Key: YARN-941
URL: https://issues.apache.org/jira/browse/YARN-941
Project: Hadoop YARN
Issue Type: Sub-task
Reporter: Robert Joseph Evans
When an application is submitted to the RM it includes with it a set of tokens
that the RM will renew on behalf of the application, that will be passed to the
AM when the application is launched, and will be used when launching the
application to access HDFS to download files on behalf of the application.
For long lived applications/services these tokens can expire, and then the
tokens that the AM has will be invalid, and the tokens that the RM had will
also not work to launch a new AM.
We need to provide an API that will allow the RM to replace the current tokens
for this application with a new set. To avoid any real race issues, I think
this API should be something that the AM calls, so that the client can connect
to the AM with a new set of tokens it got using kerberos, then the AM can
inform the RM of the new set of tokens and quickly update its tokens internally
to use these new ones.
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