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https://issues.apache.org/jira/browse/HDFS-14118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16755443#comment-16755443
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Íñigo Goiri commented on HDFS-14118:
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Thanks for [^HDFS-14118.008.patch].
I think we should also move to commons the following:
* {{RESOLVE_SERVICE_KEY}} and the hdfs-default.xml key.
* {{MockDomainNameResolver}}; into the test folder and add a small test which
checks has those hard coded values and validates those are the return types.
We should also:
* Avoid the superfluous changes in {{TestConfiguredFailoverProxyProvider}}
(e.g., empty lines and lines like 104, 107, etc).
* Move the setup of the DNS to a function and just use it for
{{testResolveDomainNameUsingDNS()}}.
> 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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