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Improve flush handling 

Similar to recent client changes, don't replace the previous node record
of an already-migrated VM. Wait for shutdown if required. Use a
continue statement instead of a needless else block.
This commit is contained in:
Joshua Boniface 2019-07-07 15:27:37 -04:00
parent 0d398f663b
commit b82ccaa84d
1 changed files with 22 additions and 10 deletions
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32
node-daemon/pvcd/NodeInstance.py
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@ -359,23 +359,35 @@ class NodeInstance(object):
for dom_uuid in fixed_domain_list:
self.logger.out('Selecting target to migrate VM "{}"'.format(dom_uuid), state='i')
current_node = zkhandler.readdata(self.zk_conn, '/domains/{}/node'.format(dom_uuid))
target_node = findTargetHypervisor(self.zk_conn, 'mem', dom_uuid)
# Don't replace the previous node if the VM is already migrated
if zkhandler.readdata(self.zk_conn, '/domains/{}/migrated') is 'yes':
current_node = zkhandler.readdata(self.zk_conn, '/domains/{}/lastnode')
else:
current_node = zkhandler.readdata(self.zk_conn, '/domains/{}/node'.format(dom_uuid))
if target_node == None:
self.logger.out('Failed to find migration target for VM "{}"; shutting down'.format(dom_uuid), state='e')
zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(dom_uuid): 'shutdown' })
else:
self.logger.out('Migrating VM "{}" to node "{}"'.format(dom_uuid, target_node), state='i')
zkhandler.writedata(self.zk_conn, {
'/domains/{}/state'.format(dom_uuid): 'migrate',
'/domains/{}/node'.format(dom_uuid): target_node,
'/domains/{}/lastnode'.format(dom_uuid): current_node
})
# Wait for the VM to migrate so the next VM's free RAM count is accurate (they migrate in serial anyways)
while zkhandler.readdata(self.zk_conn, '/domains/{}/state'.format(dom_uuid)) != 'start':
# Wait for the VM to shut down
while zkhandler.readdata(self.zk_conn, '/domains/{}/state'.format(dom_uuid)) != 'stop':
time.sleep(1)
continue
self.logger.out('Migrating VM "{}" to node "{}"'.format(dom_uuid, target_node), state='i')
zkhandler.writedata(self.zk_conn, {
'/domains/{}/state'.format(dom_uuid): 'migrate',
'/domains/{}/node'.format(dom_uuid): target_node,
'/domains/{}/lastnode'.format(dom_uuid): current_node
})
# Wait for the VM to migrate so the next VM's free RAM count is accurate (they migrate in serial anyways)
while zkhandler.readdata(self.zk_conn, '/domains/{}/state'.format(dom_uuid)) != 'start':
time.sleep(1)
zkhandler.writedata(self.zk_conn, { '/nodes/{}/runningdomains'.format(self.name): '' })
zkhandler.writedata(self.zk_conn, { '/nodes/{}/domainstate'.format(self.name): 'flushed' })
self.inflush = False