Github user aledsage commented on the issue:
https://github.com/apache/brooklyn-server/pull/487
@bostko clouds will sometimes return a machine that is dead-on-arrival
(DOA). It is impossible to ssh to that machine, no matter how long you wait.
Sometimes (less often) the VM being provisioned in that cloud might fail, and
will report a VM status of "starting" and then "error". It's not as simple as
the cloud API having failed to create the VM - a VM exists, but it's unusable.
In those cases, jclouds will not retry. That's fine - we don't want jclouds
to do the retry logic, and instead to tell us about the failure. We'll get back
the VM id that was provisioned, and can then call jclouds to destroy the VM.
Within Brooklyn, we can decide whether to retry.
It varies how often these DOA VMs happen. From my experience, it used to be
about 1 in 50 in AWS, but is even less common now. In some other clouds, it's
more common.
This param is particularly important if provisioning bigger clusters, or
many apps, as obviously it's more likely to happen if provisioning many things.
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