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Should finish allocating network before VM reaches ACTIVE
This patch can fix issues like tempest caused by async network allocation. Nova uses NetworkInfoAsyncWrapper to allocate network in an async manner, and this allows one to start querying for network info before you know you will need it. Nova will invoke refresh_cache method to update instance_cache_info after excuting the allocate_for_instance method as well. However, nova rest api will query instance_cache_info directly, thus maybe get the empty network info before instance_cache_info table has been updated asynchronously. Thus will cause VM can exist without a known address accidentally, the caller is difficult to distinguish this situation, unless waiting for some internal process or it will not have an address. So should finish allocating network before the VM reaches ACTIVE status. For more detail can refer the bug description. BTW, almost all create server related unit tests have coverred this case. Closes-Bug: #1210483 Change-Id: Iab542df1be7d5c9661d717ec596d2a37b975169a
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