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https://issues.apache.org/jira/browse/WHIRR-414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13149186#comment-13149186
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David Alves commented on WHIRR-414:
-----------------------------------

Andrei sorry for not loooking into this sooner.

Looks good, small nit: why not make load() return an empty cluster whenever 
there is nothing to load instead of using tryLoadOrEmpty().

                
> whirr can have a non-zero return code and unterminated (orphaned) host 
> instances
> --------------------------------------------------------------------------------
>
>                 Key: WHIRR-414
>                 URL: https://issues.apache.org/jira/browse/WHIRR-414
>             Project: Whirr
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 0.6.0
>         Environment: EC2, commandline whirr
>            Reporter: Paul Baclace
>            Assignee: Andrei Savu
>            Priority: Critical
>             Fix For: 0.7.0
>
>         Attachments: WHIRR-414-ignore-missing-instances-file.patch, 
> WHIRR-414-ignore-missing-instances-file.patch, WHIRR-414.patch, 
> WHIRR-414.patch, WHIRR-414.patch, WHIRR-414.patch, WHIRR-414.patch
>
>
> Whirr can fail to completely start a cluster and indicates this with a 
> non-zero return code. In many (currently intermittent) partial failure 
> scenarios, there are resources still active (EC2 machine instances, in my 
> experience) that are not cleaned up. 
> The log contains "IOException: Too many instance failed while bootstrapping!" 
> when I have seen orphaned nodes.
> A non-zero return code should guarantee that all resources are cleaned up.  
> Without this post-condition, these failures require manual inspection and 
> cleanup to stop useless expenses (which is why I marked this bug critical; it 
> needs to be addressed for any kind of cron job triggered whirr).

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