Haohui Mai created HDFS-12232:
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Summary: ConfiguredFailoverProxyProvider caches DNS results
infinitely
Key: HDFS-12232
URL: https://issues.apache.org/jira/browse/HDFS-12232
Project: Hadoop HDFS
Issue Type: Bug
Components: ha, hdfs
Reporter: Haohui Mai
{{ConfiguredFailoverProxyProvider}} resolves the IP addresses and stores them
in the internal state. As a result when migrating the standby NN to a different
machine, it requires restarting all HDFS clients.
A better approach is to follow Java's policy of caching DNS names:
http://javaeesupportpatterns.blogspot.com/2011/03/java-dns-cache-reference-guide.html
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