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https://issues.apache.org/jira/browse/HADOOP-8629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13502997#comment-13502997
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liang xie commented on HADOOP-8629:
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I prefer to provide an admin cmd to reload by administrator
> Add option for TableMapping to reload mapping file on match failure
> -------------------------------------------------------------------
>
> Key: HADOOP-8629
> URL: https://issues.apache.org/jira/browse/HADOOP-8629
> Project: Hadoop Common
> Issue Type: Improvement
> Components: util
> Reporter: Steve Loughran
> Priority: Minor
>
> As commented in HADOOP-7030, the table mapping topology mapper handles new
> node addition worse than the script mapping, because the table mapping is
> frozen for the life of the service.
> I propose adding an option (true by default?) for the class to look at the
> timestamp of the mapping file, and reload it on a change -if a hostname
> lookup failed.
>
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