Implemented coordinated locked node transitions
The previous method was a "throw it in the sea"-type migration with some (very arbitrary) sleep statements thrown in for good measure. Reimplement this with some hard locking. During each phase of the transition, the nodes acquire read/write shared locks to a Zookeeper key so that they can tightly coordinate the actions of transferring each part of the primary state between them. This is done in a subthread to prevent strange blocking issues that were encountered, likely due to business in the existing main thread.
This commit is contained in:
parent
0841ddf8b0
commit
8c252aeecc
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@ -118,9 +118,21 @@ class NodeInstance(object):
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self.router_state = data
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if self.config['enable_networking']:
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if self.router_state == 'primary':
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self.become_primary()
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# Skip becoming primary unless already running
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if self.daemon_state == 'run':
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self.logger.out('Setting node {} to primary state'.format(self.name), state='i')
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#self.become_primary()
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transition_thread = threading.Thread(target=self.become_primary, args=(), kwargs={})
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transition_thread.start()
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#transition_thread.join()
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else:
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self.become_secondary()
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# Skip becoming secondary unless already running
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if self.daemon_state == 'run':
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self.logger.out('Setting node {} to secondary state'.format(self.name), state='i')
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#self.become_secondary()
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transition_thread = threading.Thread(target=self.become_secondary, args=(), kwargs={})
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transition_thread.start()
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#transition_thread.join()
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@self.zk_conn.DataWatch('/nodes/{}/domainstate'.format(self.name))
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def watch_node_domainstate(data, stat, event=''):
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@ -259,118 +271,89 @@ class NodeInstance(object):
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def update_domain_list(self, d_domain):
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self.d_domain = d_domain
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# Routing primary/secondary states
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def become_secondary(self):
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if self.daemon_state == 'init':
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return
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self.logger.out('Setting router {} to secondary state'.format(self.name), state='i')
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self.logger.out('Network list: {}'.format(', '.join(self.network_list)), state='i')
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time.sleep(1)
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if self.config['enable_api']:
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self.logger.out('Stopping PVC API client service', state='i')
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common.run_os_command("systemctl stop pvc-api.service")
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for network in self.d_network:
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self.d_network[network].stopDHCPServer()
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self.d_network[network].removeGateways()
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self.dns_aggregator.stop_aggregator()
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self.metadata_api.stop()
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self.removeFloatingAddresses()
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######
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# Phases of node transition
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#
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# Current Primary Candidate Secondary
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# -> secondary -> primary
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#
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# def become_secondary() def become_primary()
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#
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# A ----------------------------------------------------------------- SYNC (candidate)
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# B ----------------------------------------------------------------- SYNC (current)
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# 1. Stop client API ||
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# 2. Stop metadata API ||
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# 3. Stop DNS aggregator ||
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# 4. Stop DHCP servers ||
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# 4a) network 1 ||
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# 4b) network 2 ||
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# etc. ||
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# --
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# C ----------------------------------------------------------------- SYNC (candidate)
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# 5. Remove upstream floating IP 1. Add upstream floating IP ||
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# --
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# D ----------------------------------------------------------------- SYNC (candidate)
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# 6. Remove cluster floating IP 2. Add cluster floating IP ||
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# --
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# E ----------------------------------------------------------------- SYNC (candidate)
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# 7. Remove metadata floating IP 3. Add metadata floating IP ||
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# --
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# F ----------------------------------------------------------------- SYNC (candidate)
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# 8. Remove gateway IPs 4. Add gateway IPs ||
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# 8a) network 1 4a) network 1 ||
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# 8b) network 2 4b) network 2 ||
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# etc. etc. ||
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# --
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# G ----------------------------------------------------------------- SYNC (candidate)
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# 5. Transition Patroni primary ||
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# 6. Start DHCP servers ||
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# 5a) network 1 ||
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# 5b) network 2 ||
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# etc. ||
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# 7. Start DNS aggregator ||
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# 8. Start metadata API ||
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# 9. Start client API ||
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# --
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######
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def become_primary(self):
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# Establish a lock
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with zkhandler.writelock(self.zk_conn, '/primary_node'):
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self.logger.out('Setting router {} to primary state'.format(self.name), state='i')
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self.logger.out('Network list: {}'.format(', '.join(self.network_list)), state='i')
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"""
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Acquire primary coordinator status from a peer node
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"""
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# Lock the primary node until transition is complete
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primary_lock = zkhandler.writelock(self.zk_conn, '/primary_node')
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primary_lock.acquire()
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# Create floating addresses
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self.createFloatingAddresses()
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# Start up the gateways and DHCP servers
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for network in self.d_network:
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self.d_network[network].createGateways()
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self.d_network[network].startDHCPServer()
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# Ensure our lock key is populated
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zkhandler.writedata(self.zk_conn, {'/locks/primary_node': ''})
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time.sleep(1)
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# Synchronize nodes A (I am writer)
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lock = zkhandler.writelock(self.zk_conn, '/locks/primary_node')
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self.logger.out('Acquiring write lock for synchronization A', state='i')
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lock.acquire()
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self.logger.out('Acquired write lock for synchronization A', state='o')
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time.sleep(1) # Time for reader to acquire the lock
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self.logger.out('Releasing write lock for synchronization A', state='i')
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zkhandler.writedata(self.zk_conn, {'/locks/primary_node': ''})
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lock.release()
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self.logger.out('Released write lock for synchronization A', state='o')
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time.sleep(0.1) # Time for new writer to acquire the lock
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self.logger.out('Setting Patroni leader to this node', state='i')
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tick = 1
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# As long as we're primary, keep trying to set the Patroni leader to us
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while self.router_state == 'primary':
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# Switch Patroni leader to the local instance
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retcode, stdout, stderr = common.run_os_command(
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"""
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patronictl
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-c /etc/patroni/config.yml
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-d zookeeper://localhost:2181
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switchover
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--candidate {}
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--force
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pvcdns
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""".format(self.name)
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)
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# Synchronize nodes B (I am reader)
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lock = zkhandler.readlock(self.zk_conn, '/locks/primary_node')
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self.logger.out('Acquiring read lock for synchronization B', state='i')
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lock.acquire()
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self.logger.out('Acquired read lock for synchronization B', state='o')
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self.logger.out('Releasing read lock for synchronization B', state='i')
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lock.release()
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self.logger.out('Released read lock for synchronization B', state='o')
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# Combine the stdout and stderr and strip the output
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# Patronictl's output is pretty junky
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if stderr:
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stdout += stderr
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stdout = stdout.strip()
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# Handle our current Patroni leader being us
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if stdout and stdout.split('\n')[-1].split() == ["Error:", "Switchover", "target", "and", "source", "are", "the", "same."]:
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self.logger.out('Failed to switch Patroni leader to ourselves; this is fine\n{}'.format(stdout), state='w')
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break
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# Handle a failed switchover
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elif stdout and (stdout.split('\n')[-1].split()[:2] == ["Switchover", "failed,"] or stdout.strip().split('\n')[-1].split()[:1] == ["Error"]):
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self.logger.out('Failed to switch Patroni leader; retrying [{}/5]\n{}\n'.format(tick, stdout, state='e'))
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tick += 1
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if tick > 5:
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self.logger.out('Failed to switch Patroni leader after 5 tries; aborting', state='e')
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break
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else:
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time.sleep(5)
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# Otherwise, we succeeded
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else:
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self.logger.out('Successfully switched Patroni leader\n{}'.format(stdout), state='o')
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break
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# Start the DNS aggregator instance
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time.sleep(1)
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self.dns_aggregator.start_aggregator()
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self.metadata_api.start()
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# Start the clients
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if self.config['enable_api']:
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self.logger.out('Starting PVC API client service', state='i')
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common.run_os_command("systemctl start pvc-api.service")
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self.logger.out('Starting PVC Provisioner Worker service', state='i')
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common.run_os_command("systemctl start pvc-provisioner-worker.service")
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def createFloatingAddresses(self):
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# Metadata link-local IP
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self.logger.out(
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'Creating Metadata link-local IP {}/{} on interface {}'.format(
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'169.254.169.254',
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'32',
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'lo'
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),
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state='o'
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)
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common.createIPAddress('169.254.169.254', '32', 'lo')
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# VNI floating IP
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self.logger.out(
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'Creating floating management IP {}/{} on interface {}'.format(
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self.vni_ipaddr,
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self.vni_cidrnetmask,
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'brcluster'
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),
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state='o'
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)
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common.createIPAddress(self.vni_ipaddr, self.vni_cidrnetmask, 'brcluster')
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# Upstream floating IP
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# Synchronize nodes C (I am writer)
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lock = zkhandler.writelock(self.zk_conn, '/locks/primary_node')
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self.logger.out('Acquiring write lock for synchronization C', state='i')
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lock.acquire()
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self.logger.out('Acquired write lock for synchronization C', state='o')
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time.sleep(0.5) # Time for reader to acquire the lock
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# 1. Add Upstream floating IP
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self.logger.out(
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'Creating floating upstream IP {}/{} on interface {}'.format(
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self.upstream_ipaddr,
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@ -380,31 +363,180 @@ class NodeInstance(object):
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state='o'
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)
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common.createIPAddress(self.upstream_ipaddr, self.upstream_cidrnetmask, self.upstream_dev)
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self.logger.out('Releasing write lock for synchronization C', state='i')
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zkhandler.writedata(self.zk_conn, {'/locks/primary_node': ''})
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lock.release()
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self.logger.out('Released write lock for synchronization C', state='o')
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def removeFloatingAddresses(self):
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# Metadata link-local IP
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# Synchronize nodes D (I am writer)
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lock = zkhandler.writelock(self.zk_conn, '/locks/primary_node')
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self.logger.out('Acquiring write lock for synchronization D', state='i')
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lock.acquire()
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self.logger.out('Acquired write lock for synchronization D', state='o')
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time.sleep(0.2) # Time for reader to acquire the lock
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# 2. Add Cluster floating IP
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self.logger.out(
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'Removing Metadata link-local IP {}/{} from interface {}'.format(
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'169.254.169.254',
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'32',
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'lo'
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),
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state='o'
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)
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common.removeIPAddress('169.254.169.254', '32', 'lo')
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# VNI floating IP
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self.logger.out(
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'Removing floating management IP {}/{} from interface {}'.format(
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'Creating floating management IP {}/{} on interface {}'.format(
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self.vni_ipaddr,
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self.vni_cidrnetmask,
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'brcluster'
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),
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state='o'
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)
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common.removeIPAddress(self.vni_ipaddr, self.vni_cidrnetmask, 'brcluster')
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common.createIPAddress(self.vni_ipaddr, self.vni_cidrnetmask, 'brcluster')
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self.logger.out('Releasing write lock for synchronization D', state='i')
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zkhandler.writedata(self.zk_conn, {'/locks/primary_node': ''})
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lock.release()
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self.logger.out('Released write lock for synchronization D', state='o')
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# Upstream floating IP
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# Synchronize nodes E (I am writer)
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lock = zkhandler.writelock(self.zk_conn, '/locks/primary_node')
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self.logger.out('Acquiring write lock for synchronization E', state='i')
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lock.acquire()
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self.logger.out('Acquired write lock for synchronization E', state='o')
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time.sleep(0.2) # Time for reader to acquire the lock
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# 3. Add Metadata link-local IP
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self.logger.out(
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'Creating Metadata link-local IP {}/{} on interface {}'.format(
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'169.254.169.254',
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'32',
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'lo'
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),
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state='o'
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)
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common.createIPAddress('169.254.169.254', '32', 'lo')
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self.logger.out('Releasing write lock for synchronization E', state='i')
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zkhandler.writedata(self.zk_conn, {'/locks/primary_node': ''})
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lock.release()
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self.logger.out('Released write lock for synchronization E', state='o')
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# Synchronize nodes F (I am writer)
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lock = zkhandler.writelock(self.zk_conn, '/locks/primary_node')
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self.logger.out('Acquiring write lock for synchronization F', state='i')
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lock.acquire()
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self.logger.out('Acquired write lock for synchronization F', state='o')
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time.sleep(0.2) # Time for reader to acquire the lock
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# 4. Add gateway IPs
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for network in self.d_network:
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self.d_network[network].createGateways()
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self.logger.out('Releasing write lock for synchronization F', state='i')
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zkhandler.writedata(self.zk_conn, {'/locks/primary_node': ''})
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lock.release()
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self.logger.out('Released write lock for synchronization F', state='o')
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# Synchronize nodes G (I am writer)
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lock = zkhandler.writelock(self.zk_conn, '/locks/primary_node')
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self.logger.out('Acquiring write lock for synchronization G', state='i')
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lock.acquire()
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self.logger.out('Acquired write lock for synchronization G', state='o')
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time.sleep(0.2) # Time for reader to acquire the lock
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# 5. Transition Patroni primary
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self.logger.out('Setting Patroni leader to this node', state='i')
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tick = 1
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# As long as we're primary, keep trying to set the Patroni leader to us
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while self.router_state == 'primary':
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# Switch Patroni leader to the local instance
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retcode, stdout, stderr = common.run_os_command(
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"""
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patronictl
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-c /etc/patroni/config.yml
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-d zookeeper://localhost:2181
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switchover
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--candidate {}
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--force
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pvcdns
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""".format(self.name)
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)
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# Combine the stdout and stderr and strip the output
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# Patronictl's output is pretty junky
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if stderr:
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stdout += stderr
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stdout = stdout.strip()
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# Handle our current Patroni leader being us
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if stdout and stdout.split('\n')[-1].split() == ["Error:", "Switchover", "target", "and", "source", "are", "the", "same."]:
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self.logger.out('Failed to switch Patroni leader to ourselves; this is fine\n{}'.format(stdout), state='w')
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break
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# Handle a failed switchover
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elif stdout and (stdout.split('\n')[-1].split()[:2] == ["Switchover", "failed,"] or stdout.strip().split('\n')[-1].split()[:1] == ["Error"]):
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if tick > 4:
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self.logger.out('Failed to switch Patroni leader after 5 tries; aborting', state='e')
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break
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else:
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self.logger.out('Failed to switch Patroni leader; retrying [{}/5]\n{}\n'.format(tick, stdout), state='e')
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tick += 1
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time.sleep(5)
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# Otherwise, we succeeded
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else:
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self.logger.out('Successfully switched Patroni leader\n{}'.format(stdout), state='o')
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time.sleep(0.2)
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break
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# 6. Start DHCP servers
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for network in self.d_network:
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self.d_network[network].startDHCPServer()
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# 7. Start DNS aggregator
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self.dns_aggregator.start_aggregator()
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# 8. Start metadata API
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self.metadata_api.start()
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# 9. Start client API (and provisioner worker)
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if self.config['enable_api']:
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self.logger.out('Stopping PVC API client service', state='i')
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common.run_os_command("systemctl start pvc-api.service")
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self.logger.out('Starting PVC Provisioner Worker service', state='i')
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common.run_os_command("systemctl start pvc-provisioner-worker.service")
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self.logger.out('Releasing write lock for synchronization G', state='i')
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zkhandler.writedata(self.zk_conn, {'/locks/primary_node': ''})
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lock.release()
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self.logger.out('Released write lock for synchronization G', state='o')
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primary_lock.release()
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self.logger.out('Node {} transitioned to primary state'.format(self.name), state='o')
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def become_secondary(self):
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"""
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Relinquish primary coordinator status to a peer node
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"""
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time.sleep(0.2) # Initial delay for the first writer to grab the lock
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# Synchronize nodes A (I am reader)
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lock = zkhandler.readlock(self.zk_conn, '/locks/primary_node')
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self.logger.out('Acquiring read lock for synchronization A', state='i')
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lock.acquire()
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self.logger.out('Acquired read lock for synchronization A', state='o')
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self.logger.out('Releasing read lock for synchronization A', state='i')
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lock.release()
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self.logger.out('Released read lock for synchronization A', state='o')
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# Synchronize nodes B (I am writer)
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lock = zkhandler.writelock(self.zk_conn, '/locks/primary_node')
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self.logger.out('Acquiring write lock for synchronization B', state='i')
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lock.acquire()
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self.logger.out('Acquired write lock for synchronization B', state='o')
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time.sleep(0.2) # Time for reader to acquire the lock
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# 1. Stop client API
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if self.config['enable_api']:
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self.logger.out('Stopping PVC API client service', state='i')
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common.run_os_command("systemctl stop pvc-api.service")
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# 2. Stop metadata API
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self.metadata_api.stop()
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# 3. Stop DNS aggregator
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self.dns_aggregator.stop_aggregator()
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# 4. Stop DHCP servers
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for network in self.d_network:
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self.d_network[network].stopDHCPServer()
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self.logger.out('Releasing write lock for synchronization B', state='i')
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zkhandler.writedata(self.zk_conn, {'/locks/primary_node': ''})
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lock.release()
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self.logger.out('Released write lock for synchronization B', state='o')
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time.sleep(0.1) # Time for new writer to acquire the lock
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# Synchronize nodes C (I am reader)
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lock = zkhandler.readlock(self.zk_conn, '/locks/primary_node')
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self.logger.out('Acquiring read lock for synchronization C', state='i')
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lock.acquire()
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self.logger.out('Acquired read lock for synchronization C', state='o')
|
||||
# 5. Remove Upstream floating IP
|
||||
self.logger.out(
|
||||
'Removing floating upstream IP {}/{} from interface {}'.format(
|
||||
self.upstream_ipaddr,
|
||||
|
|
@ -414,6 +546,70 @@ class NodeInstance(object):
|
|||
state='o'
|
||||
)
|
||||
common.removeIPAddress(self.upstream_ipaddr, self.upstream_cidrnetmask, self.upstream_dev)
|
||||
self.logger.out('Releasing read lock for synchronization C', state='i')
|
||||
lock.release()
|
||||
self.logger.out('Released read lock for synchronization C', state='o')
|
||||
|
||||
# Synchronize nodes D (I am reader)
|
||||
lock = zkhandler.readlock(self.zk_conn, '/locks/primary_node')
|
||||
self.logger.out('Acquiring read lock for synchronization D', state='i')
|
||||
lock.acquire()
|
||||
self.logger.out('Acquired read lock for synchronization D', state='o')
|
||||
# 6. Remove Cluster floating IP
|
||||
self.logger.out(
|
||||
'Removing floating management IP {}/{} from interface {}'.format(
|
||||
self.vni_ipaddr,
|
||||
self.vni_cidrnetmask,
|
||||
'brcluster'
|
||||
),
|
||||
state='o'
|
||||
)
|
||||
common.removeIPAddress(self.vni_ipaddr, self.vni_cidrnetmask, 'brcluster')
|
||||
self.logger.out('Releasing read lock for synchronization D', state='i')
|
||||
lock.release()
|
||||
self.logger.out('Released read lock for synchronization D', state='o')
|
||||
|
||||
# Synchronize nodes E (I am reader)
|
||||
lock = zkhandler.readlock(self.zk_conn, '/locks/primary_node')
|
||||
self.logger.out('Acquiring read lock for synchronization E', state='i')
|
||||
lock.acquire()
|
||||
self.logger.out('Acquired read lock for synchronization E', state='o')
|
||||
# 7. Remove Metadata link-local IP
|
||||
self.logger.out(
|
||||
'Removing Metadata link-local IP {}/{} from interface {}'.format(
|
||||
'169.254.169.254',
|
||||
'32',
|
||||
'lo'
|
||||
),
|
||||
state='o'
|
||||
)
|
||||
common.removeIPAddress('169.254.169.254', '32', 'lo')
|
||||
self.logger.out('Releasing read lock for synchronization E', state='i')
|
||||
lock.release()
|
||||
self.logger.out('Released read lock for synchronization E', state='o')
|
||||
|
||||
# Synchronize nodes F (I am reader)
|
||||
lock = zkhandler.readlock(self.zk_conn, '/locks/primary_node')
|
||||
self.logger.out('Acquiring read lock for synchronization F', state='i')
|
||||
lock.acquire()
|
||||
self.logger.out('Acquired read lock for synchronization F', state='o')
|
||||
# 8. Remove gateway IPs
|
||||
for network in self.d_network:
|
||||
self.d_network[network].removeGateways()
|
||||
self.logger.out('Releasing read lock for synchronization F', state='i')
|
||||
lock.release()
|
||||
self.logger.out('Released read lock for synchronization F', state='o')
|
||||
|
||||
# Synchronize nodes G (I am reader)
|
||||
lock = zkhandler.readlock(self.zk_conn, '/locks/primary_node')
|
||||
self.logger.out('Acquiring read lock for synchronization G', state='i')
|
||||
lock.acquire()
|
||||
self.logger.out('Acquired read lock for synchronization G', state='o')
|
||||
self.logger.out('Releasing read lock for synchronization G', state='i')
|
||||
lock.release()
|
||||
self.logger.out('Released read lock for synchronization G', state='o')
|
||||
|
||||
self.logger.out('Node {} transitioned to secondary state'.format(self.name), state='o')
|
||||
|
||||
# Flush all VMs on the host
|
||||
def flush(self):
|
||||
|
|
|
|||
Loading…
Reference in New Issue