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https://issues.apache.org/jira/browse/WHIRR-170?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12973929#action_12973929
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Lars George commented on WHIRR-170:
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+1 to be able to *optionally* control the order. This could be role based and
specified like so
{code}whirr.role-order=zk,nn+jt,dn+tt,hbase-master,hbase-regionserver{code}
If not specified the system should make any effort to start the services as
quickly as possible, for example in multiple threads. In other words, when the
role-order is not given no guarantee about order can be given.
> Instances should be started in the order specified in the template
> ------------------------------------------------------------------
>
> Key: WHIRR-170
> URL: https://issues.apache.org/jira/browse/WHIRR-170
> Project: Whirr
> Issue Type: Bug
> Components: core
> Reporter: Tom White
>
> For example, with a template "1 nn+jt, 1 dn+tt" we sometimes see the dn+tt
> instance launched before the nn+jt instance. This doesn't cause a problem in
> this case, but it's slightly confusing and easy to fix by using LinkedHashSet
> rather than HashSet.
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