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https://issues.apache.org/jira/browse/WHIRR-370?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Karel Vervaeke updated WHIRR-370:
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Attachment: WHIRR-370.patch
Patch introduces velocity, exposed via ClusterActionEvent.getTemplateEngine().
The patch also fixes WHIRR-561 (ganglia configuration).
The user can use custom templates by putting the template in the classpath
(e.g. $WHIRR_HOME/conf) and adding a pointer in the recipe (e.g.
hadoop-metrics.template=my-custom-hadoop-metrics.properties.vm
Notes / possible improvements:
- whirr-hadoop now has a test dependency on whirr-ganglia (which is kinda ugly)
- support adding templates via non-classpath locations (generally, support
changing the velocity engine configuration, which should be easy since it's
configured via a property object).
- support multiple template engines via plugin mechanism? (meh)
> Templating for configuration files
> ----------------------------------
>
> Key: WHIRR-370
> URL: https://issues.apache.org/jira/browse/WHIRR-370
> Project: Whirr
> Issue Type: Improvement
> Components: core
> Reporter: Tom White
> Fix For: 0.9.0
>
> Attachments: WHIRR-370.patch
>
>
> Service configuration is currently done via the Whirr properties file by
> using a special per-service prefix (e.g. 'hadoop-common'). Using a templating
> approach (using e.g. Velocity) would make changing properties more familiar
> to users, and would make it easier for service implementors (since they
> wouldn't need to implement a generator class for each configuration file).
> It might even be possible to support the old syntax (so users can still
> configure everything from one file if they wished) by, e.g., appending all
> properties starting 'hadoop-common' to the core-site.xml template, etc.
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