Can someone review MAPREDUCE-4309 and MAPREDUCE-4310?

[Jun Ping Du <jd...@vmware.com>]

These two patches are for Hadoop Network Topology extension (YARN part) for virtualization environment.

Thanks,

Junping

----- Original Message -----
From: "Jun Ping Du" <jd...@vmware.com>
To: common-dev@hadoop.apache.org, hdfs-dev@hadoop.apache.org, mapreduce-dev@hadoop.apache.org
Cc: "Mark Pollack" <mp...@vmware.com>, "Jurgen Leschner" <jl...@vmware.com>, "Richard McDougall" <rm...@vmware.com>
Sent: Monday, June 4, 2012 11:48:35 PM
Subject: Make Hadoop NetworkTopology and data locality more pluggable for other deploying topology like: virtualization.

Hello Folks,
      I just filed a Umbrella jira today to address current NetworkTopology issue that binding strictly to three tier network. The motivation here is to make hadoop more flexible for deploying topology (especially for cloud/virtualization case) and more configurable in data locality related policies like: replica placement, task scheduling, choosing block for DFSClient reading, balancing. 
      We submit a draft proposal in this Umbrella as well as the implementation code. As code base is large (~260K), the code is separated into 7 sub JIRA issues which seems to be more convenient for reviewing. However, we split the code based on functionality which cause some dependencies between patches which way we are not sure the best. Welcome to provide comments and suggestions on doc and code, and look forward to work with all of you to enhance hadoop in some new situations towards perfect.
      Hope this is a good start.    

Cheers,

Junping

----- Original Message -----
From: "Junping Du (JIRA)" <ji...@apache.org>
To: common-issues@hadoop.apache.org
Sent: Monday, June 4, 2012 12:09:22 PM
Subject: [jira] [Created] (HADOOP-8468) Umbrella of enhancements to support different failure and locality topologies

Junping Du created HADOOP-8468:
----------------------------------

             Summary: 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: 2.0.0-alpha, 1.0.0
            Reporter: Junping Du
            Assignee: Junping Du
            Priority: Critical


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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