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https://issues.apache.org/jira/browse/HADOOP-8468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13396139#comment-13396139
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Hudson commented on HADOOP-8468:
--------------------------------
Integrated in Hadoop-Hdfs-trunk-Commit #2438 (See
[https://builds.apache.org/job/Hadoop-Hdfs-trunk-Commit/2438/])
Revert r1351163 for fixing the JIRA number; it should be HADOOP-8470 but
not HADOOP-8468. (Revision 1351444)
Result = SUCCESS
szetszwo :
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1351444
Files :
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/CHANGES.txt
*
/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/NetworkTopologyWithNodeGroup.java
*
/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/resources/core-default.xml
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/net/TestNetworkTopologyWithNodeGroup.java
> Umbrella of enhancements to support different failure and locality topologies
> -----------------------------------------------------------------------------
>
> Key: HADOOP-8468
> URL: https://issues.apache.org/jira/browse/HADOOP-8468
> Project: Hadoop Common
> Issue Type: Bug
> Components: ha, io
> Affects Versions: 1.0.0, 2.0.0-alpha
> Reporter: Junping Du
> Assignee: Junping Du
> Priority: Critical
> Attachments: HADOOP-8468-total-v3.patch, HADOOP-8468-total.patch,
> Proposal for enchanced failure and locality topologies (revised-1.0).pdf,
> Proposal for enchanced failure and locality topologies.pdf
>
>
> The current hadoop network topology (described in some previous issues like:
> Hadoop-692) works well in classic three-tiers network when it comes out.
> However, it does not take into account other failure models or changes in the
> infrastructure that can affect network bandwidth efficiency like:
> virtualization.
> Virtualized platform has following genes that shouldn't been ignored by
> hadoop topology in scheduling tasks, placing replica, do balancing or
> fetching block for reading:
> 1. VMs on the same physical host are affected by the same hardware failure.
> In order to match the reliability of a physical deployment, replication of
> data across two virtual machines on the same host should be avoided.
> 2. The network between VMs on the same physical host has higher throughput
> and lower latency and does not consume any physical switch bandwidth.
> Thus, we propose to make hadoop network topology extend-able and introduce a
> new level in the hierarchical topology, a node group level, which maps well
> onto an infrastructure that is based on a virtualized environment.
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