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Add locks for VM state changes 

Use exclusive locks during API events which change VM state. This is
fairly critical to avoid potential duplicate updates. Only implemented
for these specifically required functions to avoid major performance
hits elsewhere.
This commit is contained in:
Joshua Boniface 2020-10-21 10:40:00 -04:00
parent 72f47f216a
commit 84ade53fae
1 changed files with 34 additions and 27 deletions
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19
daemon-common/vm.py
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@ -276,6 +276,7 @@ def modify_vm(zk_conn, domain, restart, new_vm_config):
zkhandler.writedata(zk_conn, zk_data)
if restart:
with zkhandler.exclusivelock(zk_conn, '/domains/{}/state'.format(dom_uuid)):
zkhandler.writedata(zk_conn, { '/domains/{}/state'.format(dom_uuid): 'restart' })
return True, ''
@ -300,6 +301,7 @@ def undefine_vm(zk_conn, domain):
current_vm_state = zkhandler.readdata(zk_conn, '/domains/{}/state'.format(dom_uuid))
if current_vm_state != 'stop':
# Set the domain into stop mode
with zkhandler.exclusivelock(zk_conn, '/domains/{}/state'.format(dom_uuid)):
zkhandler.writedata(zk_conn, { '/domains/{}/state'.format(dom_uuid): 'stop' })
# Wait for 2 seconds to allow state to flow to all nodes
@ -326,6 +328,7 @@ def remove_vm(zk_conn, domain):
current_vm_state = zkhandler.readdata(zk_conn, '/domains/{}/state'.format(dom_uuid))
if current_vm_state != 'stop':
# Set the domain into stop mode
with zkhandler.exclusivelock(zk_conn, '/domains/{}/state'.format(dom_uuid)):
zkhandler.writedata(zk_conn, { '/domains/{}/state'.format(dom_uuid): 'stop' })
# Wait for 2 seconds to allow state to flow to all nodes
@ -357,6 +360,7 @@ def start_vm(zk_conn, domain):
return False, 'ERROR: Could not find VM "{}" in the cluster!'.format(domain)
# Set the VM to start
with zkhandler.exclusivelock(zk_conn, '/domains/{}/state'.format(dom_uuid)):
zkhandler.writedata(zk_conn, { '/domains/{}/state'.format(dom_uuid): 'start' })
return True, 'Starting VM "{}".'.format(domain)
@ -375,9 +379,8 @@ def restart_vm(zk_conn, domain, wait=False):
retmsg = 'Restarting VM "{}".'.format(domain)
# Set the VM to restart
zkhandler.writedata(zk_conn, {
'/domains/{}/state'.format(dom_uuid): 'restart'
})
with zkhandler.exclusivelock(zk_conn, '/domains/{}/state'.format(dom_uuid)):
zkhandler.writedata(zk_conn, { '/domains/{}/state'.format(dom_uuid): 'restart' })
if wait:
while zkhandler.readdata(zk_conn, '/domains/{}/state'.format(dom_uuid)) == 'restart':
@ -400,9 +403,8 @@ def shutdown_vm(zk_conn, domain, wait=False):
retmsg = 'Shutting down VM "{}"'.format(domain)
# Set the VM to shutdown
zkhandler.writedata(zk_conn, {
'/domains/{}/state'.format(dom_uuid): 'shutdown'
})
with zkhandler.exclusivelock(zk_conn, '/domains/{}/state'.format(dom_uuid)):
zkhandler.writedata(zk_conn, { '/domains/{}/state'.format(dom_uuid): 'shutdown' })
if wait:
while zkhandler.readdata(zk_conn, '/domains/{}/state'.format(dom_uuid)) == 'shutdown':
@ -421,6 +423,7 @@ def stop_vm(zk_conn, domain):
current_state = zkhandler.readdata(zk_conn, '/domains/{}/state'.format(dom_uuid))
# Set the VM to start
with zkhandler.exclusivelock(zk_conn, '/domains/{}/state'.format(dom_uuid)):
zkhandler.writedata(zk_conn, { '/domains/{}/state'.format(dom_uuid): 'stop' })
return True, 'Forcibly stopping VM "{}".'.format(domain)
@ -437,6 +440,7 @@ def disable_vm(zk_conn, domain):
return False, 'ERROR: VM "{}" must be stopped before disabling!'.format(domain)
# Set the VM to start
with zkhandler.exclusivelock(zk_conn, '/domains/{}/state'.format(dom_uuid)):
zkhandler.writedata(zk_conn, { '/domains/{}/state'.format(dom_uuid): 'disable' })
return True, 'Marked VM "{}" as disable.'.format(domain)
@ -487,6 +491,7 @@ def move_vm(zk_conn, domain, target_node, wait=False, force_live=False):
retmsg = 'Permanently migrating VM "{}" to node "{}".'.format(domain, target_node)
with zkhandler.exclusivelock(zk_conn, '/domains/{}/state'.format(dom_uuid)):
zkhandler.writedata(zk_conn, {
'/domains/{}/state'.format(dom_uuid): target_state,
'/domains/{}/node'.format(dom_uuid): target_node,
@ -549,6 +554,7 @@ def migrate_vm(zk_conn, domain, target_node, force_migrate, wait=False, force_li
retmsg = 'Migrating VM "{}" to node "{}".'.format(domain, target_node)
with zkhandler.exclusivelock(zk_conn, '/domains/{}/state'.format(dom_uuid)):
zkhandler.writedata(zk_conn, {
'/domains/{}/state'.format(dom_uuid): target_state,
'/domains/{}/node'.format(dom_uuid): target_node,
@ -586,6 +592,7 @@ def unmigrate_vm(zk_conn, domain, wait=False, force_live=False):
retmsg = 'Unmigrating VM "{}" back to node "{}".'.format(domain, target_node)
with zkhandler.exclusivelock(zk_conn, '/domains/{}/state'.format(dom_uuid)):
zkhandler.writedata(zk_conn, {
'/domains/{}/state'.format(dom_uuid): target_state,
'/domains/{}/node'.format(dom_uuid): target_node,