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https://issues.apache.org/jira/browse/HDFS-12232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16108988#comment-16108988
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Kihwal Lee commented on HDFS-12232:
-----------------------------------
I believe it can be worked around by enabling ipc client level retry, which is
disabled by default in HA setup. This allows the internal addr change logic to
re-resolve and connect to the new server. The fundamental fix is more involved
as storing and handling of {{ConnectionID}} need to be changed.
> ConfiguredFailoverProxyProvider caches DNS results indefinitely
> ---------------------------------------------------------------
>
> 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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