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https://issues.apache.org/jira/browse/HADOOP-8820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13496039#comment-13496039
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Junping Du commented on HADOOP-8820:
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Nicholas, Thanks for comments and questions. Under your great help, most HDFS
part of code is committed into trunk (except Balancer), so the left parts
missing in trunk are mostly YARN. HADOOP-8817 patch is based on MRV1 which has
less code change comparing with YARN and MapReduce part is already reviewed (by
Luke). Also, I did a lot of tests on a deployed virtualized hadoop cluster for
combined patch, so I think it could be better to commit these patches as a
whole patch to get rid of potential bug involved by sync and could be
convenient for the patch to go to release branch (branch-1.2?). What do you
think?
> Backport HADOOP-8469 and HADOOP-8470: add "NodeGroup" layer in new
> NetworkTopology (also known as NetworkTopologyWithNodeGroup)
> -------------------------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-8820
> URL: https://issues.apache.org/jira/browse/HADOOP-8820
> Project: Hadoop Common
> Issue Type: New Feature
> Components: net
> Affects Versions: 1.0.0
> Reporter: Junping Du
> Assignee: Junping Du
> Attachments: HADOOP-8820.b1.002.patch, HADOOP-8820.b1.003.patch,
> HADOOP-8820.patch
>
>
> This patch backport HADOOP-8469 and HADOOP-8470 to branch-1 and includes:
> 1. Make NetworkTopology class pluggable for extension.
> 2. Implement a 4-layer NetworkTopology class (named as
> NetworkTopologyWithNodeGroup) to use in virtualized environment (or other
> situation with additional layer between host and rack).
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