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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8629) Add option for TableMapping to reload mapping file on match failure
Date Sat, 28 Jul 2012 00:19:35 GMT
Steve Loughran created HADOOP-8629:
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             Summary: 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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