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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (HDFS-3601) Implementation of ReplicaPlacementPolicyNodeGroup to support 4-layer network topology
Date Sat, 01 Jun 2013 09:04:31 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3601?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Junping Du reopened HDFS-3601:
------------------------------


Reopen issue to backport to branch-2.
                
> Implementation of ReplicaPlacementPolicyNodeGroup to support 4-layer network topology
> -------------------------------------------------------------------------------------
>
>                 Key: HDFS-3601
>                 URL: https://issues.apache.org/jira/browse/HDFS-3601
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: namenode
>            Reporter: Junping Du
>            Assignee: Junping Du
>             Fix For: 3.0.0
>
>         Attachments: HADOOP-8472-BlockPlacementPolicyWithNodeGroup-impl.patch, 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-v6.patch,
HDFS-3601-branch-2.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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