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https://issues.apache.org/jira/browse/YARN-4653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15135658#comment-15135658
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Jian He commented on YARN-4653:
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Below title has some format issue. they need to be at the same line.
{code}
5 ### AM keytab distributed via YARN; AM regenerates delegation
336 tokens for containers.
{code}
bq. No? I'm thinking of all tokens supplied to the container launch context,
I think not. The delegation tokens will be kept renewed by the
DelegationTokenRenewer thread every 24 hrs. AM keeps using the same token until
the token expired after 7 days.
bq. What should an app do in terms of running anything in its own process to
refresh/renew tokens?
IIUC, Renew will be done by the DelegationTokenRenewer thread in RM
automatically every 24 hr until the final expiration (7 days). After that AM
has to get a new token in some way to run beyond 7 days. Or just using keytabs,
instead of delegation token like you mentioned.
> Document YARN security model from the perspective of Application Developers
> ---------------------------------------------------------------------------
>
> Key: YARN-4653
> URL: https://issues.apache.org/jira/browse/YARN-4653
> Project: Hadoop YARN
> Issue Type: Task
> Components: site
> Affects Versions: 2.7.2
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Attachments: YARN-4653-001.patch, YARN-4653-002.patch,
> YARN-4653-003.patch
>
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> What YARN apps need to do for security today is generally copied direct from
> distributed shell, with a bit of [ill-informed
> superstition|https://steveloughran.gitbooks.io/kerberos_and_hadoop/content/sections/yarn.html]
> being the sole prose.
> We need a normative document in the YARN site covering
> # the needs for YARN security
> # token creation for AM launch
> # how the RM gets involved
> # token propagation on container launch
> # token renewal strategies
> # How to get tokens for other apps like HBase and Hive.
> # how to work under OOzie
> Perhaps the WritingYarnApplications.md doc is updated, otherwise why not just
> link to the relevant bit of the distributed shell client on github for a
> guarantee of staying up to date?
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