tasanuma opened a new pull request, #6510:
URL: https://github.com/apache/hadoop/pull/6510

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   ### Description of PR
   
   Currently, RouterObserverReadProxyProvider is using IPFailoverProxyProvider, 
while ObserverReadProxyProvider is using ConfiguredFailoverProxyProvider.  If 
we are to align RouterObserverReadProxyProvider with ObserverReadProxyProvider, 
RouterObserverReadProxyProvider should internally use 
ConfiguredFailoverProxyProvider.  Moreover, IPFailoverProxyProvider has an 
issue with resolving HA configurations. (For example, IPFailoverProxyProvider 
cannot resolve hdfs://router-service.)
   
   ### How was this patch tested?
   
   `mvn test -Dtest=TestObserverWithRouter` succeeded in my local computer.
   
   ### For code changes:
   
   - [x] Does the title or this PR starts with the corresponding JIRA issue id 
(e.g. 'HADOOP-17799. Your PR title ...')?
   - [x] If adding new dependencies to the code, are these dependencies 
licensed in a way that is compatible for inclusion under [ASF 
2.0](http://www.apache.org/legal/resolved.html#category-a)?
   


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