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https://issues.apache.org/jira/browse/HDDS-699?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16780842#comment-16780842
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Tsz Wo Nicholas Sze commented on HDDS-699:
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> ...  I think it's a trade off between performance and accurancy. Using a 
> single RW-lock at network topology level has better accurancy while lower 
> performance. The question is whether accurancy can be sacrified in some cases 
> without big impact to other modules.

That's good point!  It is perfectly fine if we provide a high performance but 
sometime inaccurate API.  In such case, we should specify the behavior 
carefully. 

> Detect Ozone Network topology
> -----------------------------
>
>                 Key: HDDS-699
>                 URL: https://issues.apache.org/jira/browse/HDDS-699
>             Project: Hadoop Distributed Data Store
>          Issue Type: Sub-task
>            Reporter: Xiaoyu Yao
>            Assignee: Sammi Chen
>            Priority: Major
>         Attachments: HDDS-699.00.patch, HDDS-699.01.patch, HDDS-699.02.patch
>
>
> Traditionally this has been implemented in Hadoop via script or customizable 
> java class. One thing we want to add here is the flexible multi-level support 
> instead of fixed levels like DC/Rack/NG/Node.



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