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Posted to common-issues@hadoop.apache.org by "Junping Du (JIRA)" <ji...@apache.org> on 2012/06/04 11:01:26 UTC
[jira] [Updated] (HADOOP-8472) Implementation of
ReplicaPlacementPolicyNodeGroup to support 4-layer network topology
[ 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.patch
This patch depends on HADOOP-8469(https://issues.apache.org/jira/browse/HADOOP-8469) and 8471(https://issues.apache.org/jira/browse/HADOOP-8471).
> 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.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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