[jira] [Created] (HDFS-14118) RBF: Use DNS to help resolve routers

["Fengnan Li (JIRA)" <ji...@apache.org>]

Fengnan Li created HDFS-14118:
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             Summary: RBF: Use DNS to help resolve routers
                 Key: HDFS-14118
                 URL: https://issues.apache.org/jira/browse/HDFS-14118
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Fengnan Li


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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