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Posted to common-issues@hadoop.apache.org by "Junping Du (JIRA)" <ji...@apache.org> on 2012/06/28 16:37:44 UTC

[jira] [Commented] (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:comment-tabpanel&focusedCommentId=13403139#comment-13403139 ] 

Junping Du commented on HADOOP-8472:
------------------------------------

Honest saying, the test class TestReplicationPolicyWithNodeGroup get lots of code from TestReplicationPolicy but add test on NodeGroup relationship for each test scenario. Please comment if it is necessary to refactor the parent class (TestReplicationPolicy) then the sub-class can reuse most code. If so, I will do it soon.
                
> 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.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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