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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