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https://issues.apache.org/jira/browse/HDFS-14118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16750322#comment-16750322
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Chao Sun commented on HDFS-14118:
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I think overall it makes sense to have the resolver pluggable so other
implementations can be added in future.
A couple of comments on the patch v1:
1. Is it possible that we can implement the resolving logic inside
{{getProxyAddresses}}? this can then be reused by other classes that inherit
{{AbstractNNFailoverProxyProvider}}, such as {{ObserverReadProxyProvider}}.
2. Can the config be a class name, just like
{{dfs.client.failover.proxy.provider}}? otherwise in order to add a new
implementation, people have to change HDFS code as well (as opposed to just
load the provided class).
> 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: HDFS-14118.001.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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