Provide a command line entry point to view/test topology options
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Key: HADOOP-8232
URL: https://issues.apache.org/jira/browse/HADOOP-8232
Project: Hadoop Common
Issue Type: Sub-task
Components: util
Affects Versions: 0.23.1
Reporter: Steve Loughran
Priority: Minor
Add a new command line entry point "topo" with commands for preflight checking
of a clusters topology setup.
The initial operations would be to list the implementation class of the mapper,
and attempt to load it, resolve a set of supplied hostnames, then dump the
topology map after the resolution process.
Target audience:
# ops teams trying to get a new/changed script working before deploying it on a
cluster.
# someone trying to write their first script.
Resolve and list the rack mappings of the given host
{code}
hadoop topo test [host1] [host2] ...
{code}
This would load the hostnames from a given file, resolve all of them and list
the results:
{code}
hadoop topo testfile filename
{code}
This version is intended for the ops team who have a list of hostnames, IP
addresses.
* Rather than just list them, the ops team may want to mandate that there were
no /default-rack mappings found, as that is invariably a sign that the script
isn't handling a hostname properly.
* No attempt to be clever and do IP address resolution, FQDN to hostname
mapping, etc.
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