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https://issues.apache.org/jira/browse/WHIRR-681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13566771#comment-13566771
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Roman Shaposhnik commented on WHIRR-681:
----------------------------------------
Re: CreateSitePpAndApplyRolesTest -- absolutely! Attached is a new patch with
the unit test updated. Sorry for not updating it to begin with.
As to how this feature is going to be used (and perhaps we need to put this in
docs some place) -- it allows individual puppet agents discover the topology of
the cluster (IOW, what classes are applied to what nodes) and makes decisions
based on that. Here's how it will work on the puppet side (using Zookeeper as
an example):
{noformat}
$ensemble = extlookup('zookeeper::server', ['127.0.0.1])
...
and later on in the configuration file template:
<% ensemble.each_with_index do |server,idx| %>
server.<%= idx %>=<%= server %>
<% end %>
{noformat}
That's the general idea.
Now, I'm still tweaking this patch as far as the best integration with Puppet
is concerned (hence not putting it into a 'Patch Submitted' state but simply
asking for early feedback). I'm rewriting Bigtop Puppet code as part of this as
well.
Finally, as for WHIRR-516 -- this JIRA is required to make progress on
WHIRR-516. My ultimate goal as far as WHIRR-516 is concerned is to be able to
deploy Bigtop clusters by a simple:
{noformat}
whirr.instance-templates=1 puppet:bigtop-hadoop-hdfs::namenode+\
puppet:bigtop-hbase::master+\
4 puppet:bigtop-zookeeper::server+\
puppet:bigtop-hadoop-hdfs::datanode+\
puppet:bigtop-hbase::server
{noformat}
Hope this answers your questions and, once again, thanks for the feedback --
much appreciated!
P.S. Feel free to add me to the project so I can assign these JIRAs to myself.
> enhance puppet service with an ability to export cluster topology to the
> puppet code
> ------------------------------------------------------------------------------------
>
> Key: WHIRR-681
> URL: https://issues.apache.org/jira/browse/WHIRR-681
> Project: Whirr
> Issue Type: Improvement
> Components: service/puppet
> Affects Versions: 0.8.1
> Reporter: Roman Shaposhnik
> Attachments: WHIRR-681-2.patch.txt, WHIRR-681.patch.txt
>
>
> I would like to propose that we enhance puppet service (btw, there seems to
> be no service/puppet in the components list) by implement the capability that
> exports the cluster topology via extlookup queryable manifest that gets added
> to all the nodes same way site.pp does.
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