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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-8468) Umbrella of enhancements to support different failure and locality topologies
Date Mon, 04 Jun 2012 04:11:23 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-8468?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Junping Du updated HADOOP-8468:
-------------------------------

    Attachment: Proposal for enchanced failure and locality topologies.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: Bug
>          Components: ha, io
>    Affects Versions: 1.0.0, 2.0.0-alpha
>            Reporter: Junping Du
>            Assignee: Junping Du
>            Priority: Critical
>         Attachments: 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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