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https://issues.apache.org/jira/browse/HDFS-14118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16775969#comment-16775969
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Fengnan Li commented on HDFS-14118:
-----------------------------------

[~elgoiri] and [~yzhangal] Thanks for the discussion and review! 

 

> Support using DNS to resolve nameservices to IP addresses
> ---------------------------------------------------------
>
>                 Key: HDFS-14118
>                 URL: https://issues.apache.org/jira/browse/HDFS-14118
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Fengnan Li
>            Assignee: Fengnan Li
>            Priority: Major
>         Attachments: DNS testing log, HDFS design doc_ Single domain name for 
> clients - Google Docs-1.pdf, HDFS design doc_ Single domain name for clients 
> - Google Docs.pdf, HDFS-14118.001.patch, HDFS-14118.002.patch, 
> HDFS-14118.003.patch, HDFS-14118.004.patch, HDFS-14118.005.patch, 
> HDFS-14118.006.patch, HDFS-14118.007.patch, HDFS-14118.008.patch, 
> HDFS-14118.009.patch, HDFS-14118.010.patch, HDFS-14118.011.patch, 
> HDFS-14118.012.patch, HDFS-14118.013.patch, HDFS-14118.014.patch, 
> HDFS-14118.015.patch, HDFS-14118.016.patch, HDFS-14118.017.patch, 
> HDFS-14118.018.patch, HDFS-14118.019.patch, HDFS-14118.020.patch, 
> HDFS-14118.021.patch, HDFS-14118.022.patch, HDFS-14118.023.patch, 
> HDFS-14118.024.patch, HDFS-14118.patch
>
>
> In router based federation (RBF), clients will need to know about routers to 
> talk to the HDFS cluster (obviously), and having routers updating 
> (adding/removing) will have to make config change in every client, which is a 
> painful process.
> DNS can be used here to resolve the single domain name clients knows to a 
> list of routers in the current config. However, DNS won't be able to consider 
> only resolving to the working router based on certain health thresholds.
> There are some ways about how this can be solved. One way is to have a 
> separate script to regularly check the status of the router and update the 
> DNS records if a router fails the health thresholds. In this way, security 
> might be carefully considered for this way. Another way is to have the client 
> do the normal connecting/failover after they get the list of routers, which 
> requires the change of current failover proxy provider.
> See the attached design document for details about the proposed solution.



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