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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