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https://issues.apache.org/jira/browse/HDFS-9149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14941264#comment-14941264
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He Tianyi commented on HDFS-9149:
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Thanks, [~hexiaoqiao].
The simpler idea sounds good! But I'm not quite sure adding one if statement
could cover all cases.
We'll need to assume that grandparent represents a IDC node if we go with it,
which does not always hold (since {{NetworkTopology}} did not imply that). e.g.
I have a real scenario that location are configured like
{{/DC/BUILDING/RACK/NODE}}. In this case, it is true that locality will happen
to be better, but perhaps not better enough.
> 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
> Assignee: He Tianyi
>
> {{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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