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Posted to common-dev@hadoop.apache.org by "Steve Loughran (Jira)" <ji...@apache.org> on 2021/01/21 13:36:04 UTC
[jira] [Resolved] (HADOOP-8232) Provide a command line entry point
to view/test topology options
[ https://issues.apache.org/jira/browse/HADOOP-8232?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Steve Loughran resolved HADOOP-8232.
------------------------------------
Resolution: Won't Fix
> Provide a command line entry point to view/test topology options
> ----------------------------------------------------------------
>
> 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
> Attachments: HADOOP-8232.patch, HADOOP-8232.patch
>
>
> 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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