Masatake Iwasaki commented on YARN-3752:

I don't know the exact reason yet but using independent Configuration instances 
for each RM in MiniYARNCluster as YARN-3749 do also worked.

> TestRMFailover fails due to intermittent UnknownHostException
> -------------------------------------------------------------
>                 Key: YARN-3752
>                 URL: https://issues.apache.org/jira/browse/YARN-3752
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: test
>            Reporter: Masatake Iwasaki
>            Assignee: Masatake Iwasaki
>            Priority: Minor
> Client fails to create connection due to UnknownHostException while client 
> retries to connect to next RM after failover in unit test.

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