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https://issues.apache.org/jira/browse/HADOOP-14556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16736752#comment-16736752
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Akira Ajisaka commented on HADOOP-14556:
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In addition to Kai's comment, this commit caused javadoc error.
{noformat:title=AbstractS3ATokenIdentifier.java}
* Kind => class, which is then looked up to deserialize token
{noformat}
{noformat:title=AbstractS3ATokenIdentifier.java}
* catch & downgrade. RuntimeExceptions (e.g. Preconditions checks) are
{noformat}
{noformat:title=AbstractDelegationTokenBinding.java}
* This is logged during after service start & binding:
{noformat}
{{&}} and {{>}} must be escaped in javadoc.
> S3A to support Delegation Tokens
> --------------------------------
>
> Key: HADOOP-14556
> URL: https://issues.apache.org/jira/browse/HADOOP-14556
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 3.3.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Major
> Fix For: 3.3.0
>
> Attachments: HADOOP-14556-001.patch, HADOOP-14556-002.patch,
> HADOOP-14556-003.patch, HADOOP-14556-004.patch, HADOOP-14556-005.patch,
> HADOOP-14556-007.patch, HADOOP-14556-008.patch, HADOOP-14556-009.patch,
> HADOOP-14556-010.patch, HADOOP-14556-010.patch, HADOOP-14556-011.patch,
> HADOOP-14556-012.patch, HADOOP-14556-013.patch, HADOOP-14556-014.patch,
> HADOOP-14556-015.patch, HADOOP-14556-016.patch, HADOOP-14556-017.patch,
> HADOOP-14556-018a.patch, HADOOP-14556-019.patch, HADOOP-14556-020.patch,
> HADOOP-14556-021.patch, HADOOP-14556-022.patch, HADOOP-14556-023.patch,
> HADOOP-14556-024.patch, HADOOP-14556-025.patch, HADOOP-14556-026.patch,
> HADOOP-14556-027.patch, HADOOP-14556.oath-002.patch, HADOOP-14556.oath.patch
>
>
> S3A to support delegation tokens where
> * an authenticated client can request a token via
> {{FileSystem.getDelegationToken()}}
> * Amazon's token service is used to request short-lived session secret & id;
> these will be saved in the token and marshalled with jobs
> * A new authentication provider will look for a token for the current user
> and authenticate the user if found
> This will not support renewals; the lifespan of a token will be limited to
> the initial duration. Also, as you can't request an STS token from a
> temporary session, IAM instances won't be able to issue tokens.
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