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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8472) Implementation of ReplicaPlacementPolicyNodeGroup to support 4-layer network topology
Date Mon, 04 Jun 2012 05:40:22 GMT
Junping Du created HADOOP-8472:
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             Summary: 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: 2.0.0-alpha, 1.0.0
            Reporter: Junping Du
            Assignee: Junping Du


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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