Github user anshul1886 commented on the issue:
https://github.com/apache/cloudstack/pull/1868
@ustcweizhou, In my opinion we should not do that as that way we are giving
them option of silently deploying VM on some host which he might not be aware
of. As after specifying host he is expecting that VM will be deployed on that
host. If he is ok with deploying VM on different host then he can try deploying
VM in next attempt without specifying hostid.
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