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https://issues.apache.org/jira/browse/HDFS-3941?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jing Zhao updated HDFS-3941:
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Attachment: HDFS-3941.002.patch
Based on Junping's original patch, I tried to address Nicholas's comments and
generated a new patch which may be more close to the current trunk.
Junping, if you have not worked on this, could you please help review my patch?
Otherwise please skip this patch. Thanks!
> 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-3941.002.patch, 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 from FSNameSystem to
> BlockPlacementPolicy and update removal policy slightly to remove duplicated
> replica within the same NodeGroup first when over-replicated happens.
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