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Date: Tue, 30 Oct 2012 17:50:15 +0000 (UTC)
From: "Junping Du (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HADOOP-8468) Umbrella of enhancements to
 support different failure and locality topologies
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    [ https://issues.apache.org/jira/browse/HADOOP-8468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13487059#comment-13487059 ] 

Junping Du commented on HADOOP-8468:
------------------------------------

Also, a white paper on reliability and performance evaluation for HVE: http://serengeti.cloudfoundry.com/pdf/Hadoop%20Virtualization%20Extensions%20WP.pdf .
                
> 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: Improvement
>          Components: ha, io
>    Affects Versions: 1.0.0, 2.0.0-alpha
>            Reporter: Junping Du
>            Assignee: Junping Du
>         Attachments: HADOOP-8468-total.patch, HADOOP-8468-total-v3.patch, HVE_Hadoop World Meetup 2012.pptx, HVE User Guide on branch-1(draft ).pdf, Proposal for enchanced failure and locality topologies.pdf, Proposal for enchanced failure and locality topologies (revised-1.0).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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