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https://issues.apache.org/jira/browse/HDDS-699?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16780445#comment-16780445
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Sammi Chen commented on HDDS-699:
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Hi [~szetszwo], thanks for the comments. 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.
In 02.patch, I removed the codes that use NetworkToplogy in a new SCM container
placement policy to keep this patch logically single. The new SCM container
placement policy to utilize network topology will be implemented in HDDS-700.
I will update a new patch with the single RW-lock tomorrow.
> 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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