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https://issues.apache.org/jira/browse/HADOOP-8198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13252465#comment-13252465
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Daryn Sharp commented on HADOOP-8198:
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@Todd: If the scope is only DNs, then you may be correct that it's not a
blocking issue. The basic issue is a token cannot be acquired over 1
interface, and then subsequently used via another. This may or may not be an
issue today, but it's worth noting that it places strong limitations on clients
and network topologies in a multi-NIC environment.
We have to ensure that all services issuing tokens to an external client cannot
be cannot be run on a multi-NIC host. I believe this currently applies to the
NN, RM, AM(??), JHS, and maybe others. Since the AM runs on a DN, it's the one
to be most concerned about. I don't understand the yarn token passing enough
to know if it is a problem today.
Repurposing of hosts will be impacted. If a service is moved from a failed
host to another host, and the new host is multi-NIC, then the grid internal
interfaces must be shutdown. If the host is repurposed to be a DN again, then
the interfaces will need to be re-enabled.
> Support multiple network interfaces
> -----------------------------------
>
> Key: HADOOP-8198
> URL: https://issues.apache.org/jira/browse/HADOOP-8198
> Project: Hadoop Common
> Issue Type: New Feature
> Components: io, performance
> Reporter: Eli Collins
> Assignee: Eli Collins
> Attachments: MultipleNifsv1.pdf, MultipleNifsv2.pdf,
> MultipleNifsv3.pdf
>
>
> Hadoop does not currently utilize multiple network interfaces, which is a
> common user request, and important in enterprise environments. This jira
> covers a proposal for enhancements to Hadoop so it better utilizes multiple
> network interfaces. The primary motivation being improved performance,
> performance isolation, resource utilization and fault tolerance. The attached
> design doc covers the high-level use cases, requirements, a proposal for
> trunk/0.23, discussion on related features, and a proposal for Hadoop 1.x
> that covers a subset of the functionality of the trunk/0.23 proposal.
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