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https://issues.apache.org/jira/browse/HADOOP-9698?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13705086#comment-13705086
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Luke Lu commented on HADOOP-9698:
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Although, it's desirable to make the mechanism negotiation work, which is a new
feature in RPC v9, I'm not sure why this would be a blocker, as there is no
protocol change necessary and that there is no real regression compared to
earlier versions.
AFAICT, it'd require non-trivial change to the current client to really make
the negotiation work properly. I see no need to rush the change for 2.2.
> RPCv9 client must honor server's SASL negotiate response
> --------------------------------------------------------
>
> Key: HADOOP-9698
> URL: https://issues.apache.org/jira/browse/HADOOP-9698
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: ipc
> Affects Versions: 3.0.0, 2.1.0-beta
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Priority: Critical
>
> As of HADOOP-9421, a RPCv9 server will advertise its authentication methods.
> This is meant to support features such as IP failover, better token
> selection, and interoperability in a heterogenous security environment.
> Currently the client ignores the negotiate response and just blindly attempts
> to authenticate instead of choosing a mutually agreeable auth method.
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