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From "Robert Joseph Evans (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8468) Umbrella of enhancements to support different failure and locality topologies
Date Mon, 04 Jun 2012 15:58:29 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13288643#comment-13288643
] 

Robert Joseph Evans commented on HADOOP-8468:
---------------------------------------------

Junping Du,

I have been looking at some of your patches, but there is a lot here to go through and it
is likely to take some time. 

Could you please move your JIRAs to the appropriate project. HDFS JIRAs should be moved out
of HADOOP and into HDFS, Mapreduce should go to MAPREDUCE, and only the ones that stay in
HADOOP should be for code that goes under the hadoop-common-project directory.

Thanks

                
> 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.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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