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Revision adc46059

IDadc460599831f2d1a3b378d562a2fd29b852201c

Added by Christos Stavrakakis almost 10 years ago

Perform allocations in separate transactions

Add ForUpdateManager to the Backend model, in order to guarantee
exclusive order when allocating a VM.

Use manual transactions when allocating Backend and public IP for a new
VM, since these allocations need exclusive access (SELECT..FOR UPDATE)
and running them inside the same transaction with create_server would result
in backends and public networks to be locked until the job is sent to the Ganeti
backend.

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