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https://issues.apache.org/jira/browse/HADOOP-3988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12661100#action_12661100
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Steve Loughran commented on HADOOP-3988:
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If you start the JVM with a TTL property on the command line, it gets picked
up. If hadoop does its own TTL code underneath that, then you probably get the
minimum TTL of hadoop-site.xml and the JVM. I think.
this is going to be painful to test.
> 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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