Commit 3ab85869 authored by Christos Stavrakakis's avatar Christos Stavrakakis
Browse files

Fix deadlock when creating server

Fix deadlock when creating a server that was introduced by commit
501053a. Allocating the public IP in the same transaction with creating
the server resulted in a deadlock with backend allocator, because
inserting the new VM in the database waits on an exclusive lock of the
backend (foreign key).
parent cde1fb80
......@@ -59,7 +59,7 @@ from django.db.models import Q
from snf_django.lib.api import faults
from synnefo.db.models import (Flavor, VirtualMachine, VirtualMachineMetadata,
Network, BackendNetwork, NetworkInterface,
BridgePoolTable, MacPrefixPoolTable)
BridgePoolTable, MacPrefixPoolTable, Backend)
from synnefo.db.pools import EmptyPool
from snf_django.lib.astakos import get_user
......@@ -267,6 +267,12 @@ def get_public_ip(backend):
This method should run inside a transaction.
# Guarantee exclusive access to backend, because accessing the IP pools of
# the backend networks may result in a deadlock with backend allocator
# which also checks that backend networks have a free IP.
backend = Backend.objects.select_for_update().get(
address = None
if settings.PUBLIC_USE_POOL:
(network, address) = allocate_public_address(backend)
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