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Date: Tue, 3 Jul 2012 10:49:24 +0000 (UTC)
From: "Junping Du (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Updated] (HADOOP-8472) Implementation of
 ReplicaPlacementPolicyNodeGroup to support 4-layer network topology
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     [ https://issues.apache.org/jira/browse/HADOOP-8472?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Junping Du updated HADOOP-8472:
-------------------------------

    Attachment: HADOOP-8472-BlockPlacementPolicyWithNodeGroup-impl-v5.patch

Two changes in v5 patch:
1. Remove TopologyResolver and TestTopologyResolver and put the static methods to NetworkTopology
2. Replace method of getRack(), getNodeGroup() with getFirstHalf() and getLastHalf() to hide NodeGroup info from pluggable class.
                
> Implementation of ReplicaPlacementPolicyNodeGroup to support 4-layer network topology
> -------------------------------------------------------------------------------------
>
>                 Key: HADOOP-8472
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8472
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ha, io
>    Affects Versions: 1.0.0, 2.0.0-alpha
>            Reporter: Junping Du
>            Assignee: Junping Du
>         Attachments: HADOOP-8472-BlockPlacementPolicyWithNodeGroup-impl-v2.patch, HADOOP-8472-BlockPlacementPolicyWithNodeGroup-impl-v3.patch, HADOOP-8472-BlockPlacementPolicyWithNodeGroup-impl-v4.patch, HADOOP-8472-BlockPlacementPolicyWithNodeGroup-impl-v5.patch, HADOOP-8472-BlockPlacementPolicyWithNodeGroup-impl.patch
>
>
> A subclass of ReplicaPlacementPolicyDefault, ReplicaPlacementPolicyNodeGroup was developed along with unit tests to support the four-layer hierarchical topology.
> The replica placement strategy used in ReplicaPlacementPolicyNodeGroup virtualization is almost the same as the original one. The differences are:
> 1. The 3rd replica will be off node group of the 2nd replica
> 2. If there is no local node available, the 1st replica will be placed on a node in the local node group.

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