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https://issues.apache.org/jira/browse/HDFS-14118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16755465#comment-16755465
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Fengnan Li commented on HDFS-14118:
-----------------------------------
[~elgoiri] Thanks for the detailed feedback!
I have some confusions about the RESOLVE_SERVICE_KEY. Do you mean to put it
into core-default.xml file? Since this config is for per cluster service
discovery service, if we move it to the common, we will have to put all of the
different resolvers into the core-site.xml as well.
> Use DNS to resolve Namenodes and Routers
> ----------------------------------------
>
> 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-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.patch
>
>
> Clients will need to know about routers to talk to the HDFS cluster
> (obviously), and having routers updating (adding/removing) will have to make
> every client change, 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.
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