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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3988) The elephant should remember names, not numbers.
Date Thu, 21 Aug 2008 15:56:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12624407#action_12624407

Allen Wittenauer commented on HADOOP-3988:

Steve's comment reminded me of an important detail that is bound to come up from our experiment!
I failed to mention that we set the TTL for the DNS CNAME to be an extremely low value (5
minutes) in the DNS zone.  We knew (and tested to make sure) that on the DNS side, the address
change would be handled properly.

> 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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