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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDDS-699) Detect Ozone Network topology
Date Thu, 28 Feb 2019 19:09:00 GMT

    [ https://issues.apache.org/jira/browse/HDDS-699?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16780842#comment-16780842

Tsz Wo Nicholas Sze commented on HDDS-699:

> ...  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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