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From "Steve Loughran (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8049) Add entry point/script to do preflight checking of script resolution
Date Thu, 09 Feb 2012 17:33:59 GMT
Add entry point/script to do preflight checking of script resolution
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                 Key: HADOOP-8049
                 URL: https://issues.apache.org/jira/browse/HADOOP-8049
             Project: Hadoop Common
          Issue Type: New Feature
          Components: util
    Affects Versions: 1.0.0, 0.24.0
            Reporter: Steve Loughran
            Priority: Minor


The script supplied by the ops team could have many problems
# not run
# have the wrong permissions
# fail to parse/resolve some or all hosts
# not be the string set in the configuration file.

Diagnostics could be improved here with an entry point that
# reads in the configuration file
# instantiates whatever mapper is declared
# attempts to resolve all hosts passed in as arguments, logging success and failures
# prints out a topology map at the end
A key goal would be to recognise and report a complete failure to report a mapping as per
MAPREDUCE-50, so let people identify problems in their script before updating the cluster

Test plan
-Java entry point: invoke it with arguments, get the output as a string and scan.
-Shell script. Include whatever post-install script tests are being written.

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