def render_config_restart_on_changed(hosts, bootstrap=False):
"""Render mysql config and restart mysql service if file changes as a
result.
If bootstrap is True we do a bootstrap-pxc in order to bootstrap the
percona cluster. This should only be performed once at cluster creation
time.
If percona is already bootstrapped we can get away with just ensuring that
it is started so long as the new node to be added is guaranteed to have
been restarted so as to apply the new config.
"""
config_file = resolve_cnf_file()
pre_hash = file_hash(config_file)
render_config(hosts)
create_binlogs_directory()
update_db_rels = False
if file_hash(config_file) != pre_hash or bootstrap:
if bootstrap:
bootstrap_pxc()
# NOTE(dosaboy): this will not actually do anything if no cluster
# relation id exists yet.
notify_bootstrapped()
update_db_rels = True
else:
# NOTE(jamespage):
# if mysql@bootstrap is running, then the native
# bootstrap systemd service was used to start this
# instance, and it was the initial seed unit
# stop the bootstap version before restarting normal mysqld
if service_running('mysql@bootstrap'):
service_stop('mysql@bootstrap')
attempts = 0
max_retries = 5
cluster_wait()
while not service_restart('mysql'):
if attempts == max_retries:
raise Exception("Failed to start mysql (max retries "
"reached)")
log("Failed to start mysql - retrying per distributed wait",
WARNING)
attempts += 1
cluster_wait()
# If we get here we assume prior actions have succeeded to always
# this unit is marked as seeded so that subsequent calls don't result
# in a restart.
mark_seeded()
if update_db_rels:
update_client_db_relations()
else:
log("Config file '{}' unchanged".format(config_file), level=DEBUG)
def render_config_restart_on_changed(hosts, bootstrap=False):
"""Render mysql config and restart mysql service if file changes as a
result.
If bootstrap is True we do a bootstrap-pxc in order to bootstrap the
percona cluster. This should only be performed once at cluster creation
time.
If percona is already bootstrapped we can get away with just ensuring that
it is started so long as the new node to be added is guaranteed to have
been restarted so as to apply the new config.
"""
config_file = resolve_cnf_file()
pre_hash = file_hash(config_file)
render_config(hosts)
create_binlogs_directory()
update_db_rels = False
if file_hash(config_file) != pre_hash or bootstrap:
if bootstrap:
bootstrap_pxc()
# NOTE(dosaboy): this will not actually do anything if no cluster
# relation id exists yet.
notify_bootstrapped()
update_db_rels = True
else:
# NOTE(jamespage):
# if mysql@bootstrap is running, then the native
# bootstrap systemd service was used to start this
# instance, and it was the initial seed unit
# stop the bootstap version before restarting normal mysqld
if service_running('mysql@bootstrap'):
service_stop('mysql@bootstrap')
attempts = 0
max_retries = 5
cluster_wait()
while not service_restart('mysql'):
if attempts == max_retries:
raise Exception("Failed to start mysql (max retries "
"reached)")
log("Failed to start mysql - retrying per distributed wait",
WARNING)
attempts += 1
cluster_wait()
# If we get here we assume prior actions have succeeded to always
# this unit is marked as seeded so that subsequent calls don't result
# in a restart.
mark_seeded()
if update_db_rels:
update_client_db_relations()
else:
log("Config file '{}' unchanged".format(config_file), level=DEBUG)
def test_cluster_wait(self):
self.relation_ids.return_value = ['amqp:27']
self.related_units.return_value = ['unit/1', 'unit/2', 'unit/3']
# Default check peer relation
_config = {'known-wait': 30}
self.config.side_effect = lambda key: _config.get(key)
percona_utils.cluster_wait()
self.distributed_wait.assert_called_with(modulo=4, wait=30)
# Use Min Cluster Size
_config = {'min-cluster-size': 5, 'known-wait': 30}
self.config.side_effect = lambda key: _config.get(key)
percona_utils.cluster_wait()
self.distributed_wait.assert_called_with(modulo=5, wait=30)
# Override with modulo-nodes
_config = {'min-cluster-size': 5, 'modulo-nodes': 10, 'known-wait': 60}
self.config.side_effect = lambda key: _config.get(key)
percona_utils.cluster_wait()
self.distributed_wait.assert_called_with(modulo=10, wait=60)
# Just modulo-nodes
_config = {'modulo-nodes': 10, 'known-wait': 60}
self.config.side_effect = lambda key: _config.get(key)
percona_utils.cluster_wait()
self.distributed_wait.assert_called_with(modulo=10, wait=60)