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https://issues.apache.org/jira/browse/HDFS-4652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13617383#comment-13617383
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Junping Du commented on HDFS-4652:
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The UT failed is a non-related issue as previous Jenkins build with the same
failure. Already filed HDFS-4653 to address this.
> Node with one topology layer should be handled as fault topology when
> NodeGroup layer is enabled
> ------------------------------------------------------------------------------------------------
>
> Key: HDFS-4652
> URL: https://issues.apache.org/jira/browse/HDFS-4652
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 1.1.2
> Reporter: Junping Du
> Assignee: Junping Du
> Attachments: HDFS-4652-branch1.patch, HDFS-4652.patch
>
>
> Currently, nodes with one layer topology are allowed to join in the cluster
> that with enabling NodeGroup layer which cause some exception cases.
> When NodeGroup layer is enabled, the cluster should assumes that at least two
> layer (Rack/NodeGroup) is valid topology for each nodes, so should throw
> exceptions for one layer node in joining.
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