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https://issues.apache.org/jira/browse/HADOOP-8820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13496481#comment-13496481
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Tsz Wo (Nicholas), SZE commented on HADOOP-8820:
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Junping, there is no easy way to review such a big patch in HADOOP-8817. It is
simply too big. Also, branch-1 is a stable branch so that we must be
conservative. Splitting it into 4 parts HADOOP-8820, HDFS-3941, HDFS-3942 and
MAPREDUCE-4660 sounds really good. Would you mind doing it?
In the meantime, I will review your balancer patch for trunk.
> 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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