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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