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Date: Tue, 18 Sep 2012 02:41:08 +1100 (NCT)
From: "Junping Du (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Updated] (HDFS-3941) Backport HDFS-3498 and HDFS3601:
 update replica placement policy for new added "NodeGroup" layer topology
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     [ https://issues.apache.org/jira/browse/HDFS-3941?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Junping Du updated HDFS-3941:
-----------------------------

    Description: 
With enabling additional layer of "NodeGroup", the replica placement policy used in BlockPlacementPolicyWithNodeGroup is updated to following rules:
0. No more than one replica is placed within a NodeGroup (*)
1. First replica on the local node.
2. Second and third replicas are within the same rack but remote rack with 1st replica.
3. Other replicas on random nodes with restriction that no more than two replicas are placed in the same rack, if there is enough racks.

Also, this patch abstract Replica Removal Policy

    
> Backport HDFS-3498 and HDFS3601: update replica placement policy for new added "NodeGroup" layer topology
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-3941
>                 URL: https://issues.apache.org/jira/browse/HDFS-3941
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: name-node
>    Affects Versions: 1.0.0
>            Reporter: Junping Du
>            Assignee: Junping Du
>         Attachments: HDFS-3941.patch
>
>
> With enabling additional layer of "NodeGroup", the replica placement policy used in BlockPlacementPolicyWithNodeGroup is updated to following rules:
> 0. No more than one replica is placed within a NodeGroup (*)
> 1. First replica on the local node.
> 2. Second and third replicas are within the same rack but remote rack with 1st replica.
> 3. Other replicas on random nodes with restriction that no more than two replicas are placed in the same rack, if there is enough racks.
> Also, this patch abstract Replica Removal Policy

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