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https://issues.apache.org/jira/browse/HDFS-9149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14909767#comment-14909767
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He Xiaoqiao commented on HDFS-9149:
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[~He Tianyi] i think it is not necessary to extend {{NetworkTopology}} to
satisfy dc aware, maybe we can improve {{getWeight}} with higher layer in the
topology for better locality.
> Consider multi datacenter when sortByDistance
> ---------------------------------------------
>
> Key: HDFS-9149
> URL: https://issues.apache.org/jira/browse/HDFS-9149
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Reporter: He Xiaoqiao
>
> {{sortByDistance}} doesn't consider multi-datacenter when read data, so there
> my be reading data via other datacenter when hadoop deployment with multi-IDC.
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