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https://issues.apache.org/jira/browse/HADOOP-8472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13405659#comment-13405659
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Tsz Wo (Nicholas), SZE commented on HADOOP-8472:
------------------------------------------------
> ... TopologyResolver is called in BlockPlacementPolicyWithNodeGroup ...
But all calls have withNodeGroupLayer == true so they can use the then-clause
directly, e.g. in the getRack method below, use
getFirstHalf(host.getNetworkLocation()) instead of getRack(host, true).
{code}
+ public static String getRack(Node host, boolean withNodeGroupLayer) {
+ return withNodeGroupLayer ? getFirstHalf(host.getNetworkLocation())
+ : host.getNetworkLocation();
+ }
{code}
The NodeGroup concept should only be visible in the pluggin. The original code
should know nothing about it.
> 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.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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