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https://issues.apache.org/jira/browse/HDFS-4240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13508994#comment-13508994
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Jing Zhao commented on HDFS-4240:
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+1 for the new patch.
> In nodegroup-aware case, make sure nodes are avoided to place replica if some
> replica are already under the same nodegroup
> --------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-4240
> URL: https://issues.apache.org/jira/browse/HDFS-4240
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Reporter: Junping Du
> Assignee: Junping Du
> Attachments: HADOOP-9045.patch, HADOOP-9045-v2.patch,
> HADOOP-9045-v3.patch, HADOOP-9045-v4.patch, HDFS-4240.patch
>
>
> In previous implementation for HADOOP-8468, 3rd replica is avoid to place on
> the same nodegroup of 2nd replica. But it didn't provide check on nodegroup
> of 1st replica, so if 2nd replica's rack is not efficient to place replica,
> then it is possible to place 3rd and 1st replica within the same node group.
> We need a change to remove all nodes from available nodes for placing replica
> if there already replica on the same nodegroup.
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