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https://issues.apache.org/jira/browse/HDFS-2904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13211019#comment-13211019
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Mahadev konar commented on HDFS-2904:
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bq. I was thinking it wouldn't, necessarily. Our current client side code has
no notion of being able to list all of the potential NNs, only of being able to
get a proxy to the active one.
bq. With ZK, you wouldn't necessarily have a list of the standbys. For example,
it might be that when you submit the job, the SBN happened to be down for
maintenance. Then when you bring it back up and do a failover to it, it
wouldn't have been listed for DT renewal.
> HA: Client support for getting delegation tokens to an HA cluster
> -----------------------------------------------------------------
>
> Key: HDFS-2904
> URL: https://issues.apache.org/jira/browse/HDFS-2904
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ha, hdfs client, name-node, security
> Affects Versions: HA branch (HDFS-1623)
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Critical
> Attachments: hdfs-2904.txt, hdfs-2904.txt, hdfs-2904.txt, test-dt.sh
>
>
> Currently we have server-side support for delegation tokens in HA, and some
> tests to verify it, but the client throws NPEs when trying to fetch a DT.
> This is because the cluster doesn't have a single hostname, but instead a
> logical nameservice name.
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