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https://issues.apache.org/jira/browse/HADOOP-3988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12660867#action_12660867
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Raghu Angadi commented on HADOOP-3988:
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{quote} Alan - I believe the Sun JVM DNS cache still ignores the TTL that comes
down from above. It's to stop applets and other sandboxed things breaking out
of the sandbox and talking to hosts behind the firewall, but interferes with
long-lived server-side code. {quote}
oops! fix for Sun JVM is a must.
> The elephant should remember names, not numbers.
> ------------------------------------------------
>
> Key: HADOOP-3988
> URL: https://issues.apache.org/jira/browse/HADOOP-3988
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.17.2
> Reporter: Allen Wittenauer
>
> The name node and the data node should not cache the resolution of host
> names, as doing so prevents the use of DNS CNAMEs for any sort of fail over
> capability.
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