def __init__(self, rms_conf):
conf = rms_conf['ringmasterd']
self.swiftdir = conf.get('swiftdir', '/etc/swift')
self.builder_files = \
{'account': conf.get('account_builder',
'/etc/swift/account.builder'),
'container': conf.get('container_builder',
'/etc/swift/container.builder'),
'object': conf.get('object_builder',
'/etc/swift/object.builder')}
self.ring_files = \
{'account': conf.get('account_ring',
'/etc/swift/account.ring.gz'),
'container': conf.get('container_ring',
'/etc/swift/container.ring.gz'),
'object': conf.get('object_ring',
'/etc/swift/object.ring.gz')}
self.debug = conf.get('debug_mode', 'n') in TRUE_VALUES
self.pause_file = conf.get('pause_file_path', '/tmp/.srm-pause')
self.default_weight_shift = float(conf.get('default_weight_shift',
'25.0'))
self.backup_dir = conf.get('backup_dir', '/etc/swift/backups')
self.recheck_interval = int(conf.get('interval', '120'))
self.recheck_after_change_interval = int(conf.get('change_interval',
'3600'))
self.mph_enabled = conf.get('min_part_hours_check', 'n') in TRUE_VALUES
self.sec_since_modified = int(conf.get('min_seconds_since_change',
'120'))
self.balance_threshold = float(conf.get('balance_threshold', '2'))
self.dispersion_cmd = conf.get('dispersion_cmd',
'/usr/bin/swift-dispersion-report')
self.dispersion_pct = {'container': float(conf.get('container_min_pct',
'99.75')),
'object': float(conf.get('object_min_pct',
'99.75'))}
self.lock_timeout = int(conf.get('lock_timeout', '90'))
window = conf.get('change_window', '0000,2400')
self.change_window = [int(x) for x in window.split(',')]
if self.debug:
conf['log_level'] = 'DEBUG'
self.logger = get_logger(conf, 'ringmasterd', self.debug)
if not os.access(self.swiftdir, os.W_OK):
self.logger.error('swift_dir is not writable. exiting!')
sys.exit(1)
if conf.get('email_notify', 'n') in TRUE_VALUES:
self.email_notify = EmailNotify(conf, self.logger)
else:
self.email_notify = None
class RingMasterServer(object):
def __init__(self, rms_conf):
conf = rms_conf['ringmasterd']
self.swiftdir = conf.get('swiftdir', '/etc/swift')
self.builder_files = \
{'account': conf.get('account_builder',
'/etc/swift/account.builder'),
'container': conf.get('container_builder',
'/etc/swift/container.builder'),
'object': conf.get('object_builder',
'/etc/swift/object.builder')}
self.ring_files = \
{'account': conf.get('account_ring',
'/etc/swift/account.ring.gz'),
'container': conf.get('container_ring',
'/etc/swift/container.ring.gz'),
'object': conf.get('object_ring',
'/etc/swift/object.ring.gz')}
self.debug = conf.get('debug_mode', 'n') in TRUE_VALUES
self.pause_file = conf.get('pause_file_path', '/tmp/.srm-pause')
self.default_weight_shift = float(conf.get('default_weight_shift',
'25.0'))
self.backup_dir = conf.get('backup_dir', '/etc/swift/backups')
self.recheck_interval = int(conf.get('interval', '120'))
self.recheck_after_change_interval = int(conf.get('change_interval',
'3600'))
self.mph_enabled = conf.get('min_part_hours_check', 'n') in TRUE_VALUES
self.sec_since_modified = int(conf.get('min_seconds_since_change',
'120'))
self.balance_threshold = float(conf.get('balance_threshold', '2'))
self.dispersion_cmd = conf.get('dispersion_cmd',
'/usr/bin/swift-dispersion-report')
self.dispersion_pct = {'container': float(conf.get('container_min_pct',
'99.75')),
'object': float(conf.get('object_min_pct',
'99.75'))}
self.lock_timeout = int(conf.get('lock_timeout', '90'))
window = conf.get('change_window', '0000,2400')
self.change_window = [int(x) for x in window.split(',')]
if self.debug:
conf['log_level'] = 'DEBUG'
self.logger = get_logger(conf, 'ringmasterd', self.debug)
if not os.access(self.swiftdir, os.W_OK):
self.logger.error('swift_dir is not writable. exiting!')
sys.exit(1)
if conf.get('email_notify', 'n') in TRUE_VALUES:
self.email_notify = EmailNotify(conf, self.logger)
else:
self.email_notify = None
def _emit_notify(self, source, message):
"Send out any configured notifications"
if self.email_notify:
self.email_notify.send_message(source, message)
def pause_if_asked(self):
"""Check if pause file exists and sleep until its removed if it does"""
if exists(self.pause_file):
self.logger.notice('--> Pause file found. Pausing orchestration!')
while exists(self.pause_file):
sleep(1)
self.logger.notice('--> Pause removed. Resuming orchestration!')
def rebalance_ring(self, builder):
"""Rebalance a ring
:param builder: builder to rebalance
:returns: True on successful rebalance, False if it fails.
"""
self.pause_if_asked()
devs_changed = builder.devs_changed
try:
last_balance = builder.get_balance()
parts, balance = builder.rebalance()
except exceptions.RingBuilderError:
self.logger.error("-> Rebalance failed!")
self.logger.exception('RingBuilderError')
return False
if not parts:
self.logger.notice("-> No partitions reassigned!")
self.logger.notice("-> (%d/%.02f)" % (parts, balance))
return False
if not devs_changed and abs(last_balance - balance) < 1:
self.logger.notice("-> Rebalance failed to change more than 1%!")
return False
self.logger.notice('--> Reassigned %d (%.02f%%) partitions. Balance '
'is %.02f.' % (parts, 100.0 * parts / builder.parts,
balance))
return True
def adjust_ring(self, builder):
"""Adjust device weights in a ring
:param builder: builder to adjust
"""
self.pause_if_asked()
for dev in builder.devs:
if not dev:
continue
if 'target_weight' in dev:
if 'weight_shift' in dev:
weight_shift = dev['weight_shift']
else:
weight_shift = self.default_weight_shift
if dev['weight'] == dev['target_weight']:
continue
elif dev['weight'] < dev['target_weight']:
if dev['weight'] + weight_shift \
< dev['target_weight']:
builder.set_dev_weight(
dev['id'], dev['weight'] + weight_shift)
else:
builder.set_dev_weight(dev['id'], dev['target_weight'])
self.logger.debug(
"--> [%s/%s] ++ weight to %s" % (dev['ip'],
dev['device'],
dev['weight']))
elif dev['weight'] > dev['target_weight']:
if dev['weight'] - weight_shift \
> dev['target_weight']:
builder.set_dev_weight(
dev['id'], dev['weight'] - weight_shift)
else:
builder.set_dev_weight(dev['id'], dev['target_weight'])
self.logger.debug(
"--> [%s/%s] -- weight to %s" % (dev['ip'],
dev['device'],
dev['weight']))
def ring_requires_change(self, builder):
"""Check if a ring requires changes
:param builder: builder who's devices to check
:returns: True if ring requires change
"""
self.pause_if_asked()
if builder.devs_changed:
return True
if not self.ring_balance_ok(builder):
return True
for dev in builder.devs:
if not dev:
continue
if 'target_weight' in dev:
if dev['weight'] != dev['target_weight']:
self.logger.debug("--> [%s] weight %s | target %s"
% (
dev['ip'] + '/' +
dev['device'], dev['weight'],
dev['target_weight']))
return True
return False
def in_change_window(self):
"""Check if we are within the allowed time window for a change"""
start = self.change_window[0]
end = self.change_window[1]
now = gmtime().tm_hour + gmtime().tm_min
if start <= end:
return start <= now <= end
else:
return start <= now or now <= end
def dispersion_ok(self, swift_type):
"""Run a dispersion report and check whether its 'ok'
:param swift_type: either 'container' or 'object'
:returns: True if the dispersion report is 'ok'
"""
self.pause_if_asked()
if swift_type == 'account':
return True
self.logger.debug("--> Running %s dispersion report" % swift_type)
dsp_cmd = [self.dispersion_cmd, '-j', '--%s-only' % swift_type]
try:
result = json.loads(subprocess.Popen(dsp_cmd,
stdout=subprocess.PIPE).communicate()[0])
except Exception:
self.logger.exception('Error running dispersion report')
return False
if not result[swift_type]:
self.logger.notice("--> Dispersion report run returned nothing!")
return False
self.logger.debug("--> Dispersion info: %s" % result)
#the dsp report json output has changed a bit so we have to check for all
if not result[swift_type].get('missing_2', 0) == 0 and \
result[swift_type].get('missing_3', 0) == 0 and \
result[swift_type].get('missing_all', 0) == 0:
return False
if result[swift_type]['pct_found'] > self.dispersion_pct[swift_type]:
return True
else:
return False
def min_part_hours_ok(self, builder):
"""Check if min part hours has elapsed
:param builder: builder to check
:returns: True if min part hours have elapsed
"""
self.pause_if_asked()
elapsed_hours = int(time() - builder._last_part_moves_epoch) / 3600
self.logger.debug('--> partitions last moved %d hours ago [%s]'
% (elapsed_hours, datetime.utcfromtimestamp(
builder._last_part_moves_epoch)))
if elapsed_hours > builder.min_part_hours:
return True
else:
return False
def min_modify_time(self, btype):
"""Check if minimum modify time has passed
:param btype: builder to check one of account|container|object
:returns: True if min modify time has elapsed
"""
self.pause_if_asked()
since_modified = time() - stat(self.builder_files[btype]).st_mtime
self.logger.debug(
'--> Ring last modified %d seconds ago.' % since_modified)
if since_modified > self.sec_since_modified:
return True
else:
return False
def ring_balance_ok(self, builder):
"""Check if ring balance is ok
:param builder: builder to check
:returns: True ring balance is ok
"""
self.pause_if_asked()
self.logger.debug(
'--> Current balance: %.02f' % builder.get_balance())
return builder.get_balance() <= self.balance_threshold
def write_builder(self, btype, builder):
"""Write out new builder file
:param btype: The builder type
:param builder: The builder to dump
:returns: new ring file md5
"""
self.pause_if_asked()
builder_file = self.builder_files[btype]
try:
fd, tmppath = mkstemp(dir=self.swiftdir, suffix='.tmp.builder')
pickle.dump(builder.to_dict(), fdopen(fd, 'wb'), protocol=2)
backup, backup_md5 = make_backup(builder_file, self.backup_dir)
self.logger.notice('--> Backed up %s to %s (%s)' %
(builder_file, backup, backup_md5))
chmod(tmppath, 0644)
rename(tmppath, builder_file)
except Exception as err:
raise Exception('Error writing builder: %s' % err)
finally:
if fd:
try:
close(fd)
except OSError:
pass
if tmppath:
try:
unlink(tmppath)
except OSError:
pass
return get_md5sum(builder_file)
def write_ring(self, btype, builder):
"""Write out new ring files
:param btype: The builder type
:param builder: The builder to dump
:returns: new ring file md5
"""
try:
self.pause_if_asked()
ring_file = self.ring_files[btype]
fd, tmppath = mkstemp(dir=self.swiftdir, suffix='.tmp.ring.gz')
builder.get_ring().save(tmppath)
close(fd)
if not is_valid_ring(tmppath):
unlink(tmppath)
raise Exception('Ring Validate Failed')
backup, backup_md5 = make_backup(ring_file, self.backup_dir)
self.logger.notice('--> Backed up %s to %s (%s)' %
(ring_file, backup, backup_md5))
chmod(tmppath, 0644)
rename(tmppath, ring_file)
except Exception as err:
raise Exception('Error writing builder: %s' % err)
finally:
if fd:
try:
close(fd)
except OSError:
pass
if tmppath:
try:
unlink(tmppath)
except OSError:
pass
return get_md5sum(ring_file)
def orchestration_pass(self, btype):
"""Check the rings, make any needed adjustments, and deploy the ring
:param btype: The builder type to work on.
:return: True if the builder was modified , False if it was not
"""
self.pause_if_asked()
self.logger.debug("=" * 79)
self.logger.notice("Checking on %s ring..." % btype)
self.logger.debug("=" * 79)
builder = RingBuilder.load(self.builder_files[btype])
if self.ring_requires_change(builder):
self.logger.notice("[%s] -> ring requires weight change." % btype)
if self.mph_enabled:
if not self.min_part_hours_ok(builder):
self.logger.notice(
"[%s] -> Ring min_part_hours: not ready!" % btype)
return False
else:
self.logger.notice(
"[%s] -> Ring min_part_hours: ok" % btype)
if not self.min_modify_time(btype):
self.logger.notice(
"[%s] -> Ring last modify time: not ready!" % btype)
return False
else:
self.logger.notice("[%s] -> Ring last modify time: ok" % btype)
if not self.dispersion_ok(btype):
self.logger.notice(
"[%s] -> Dispersion report: not ready!" % btype)
return False
else:
self.logger.notice("[%s] -> Dispersion report: ok" % btype)
if self.ring_balance_ok(builder):
self.logger.notice("[%s] -> Current Ring balance: ok" % btype)
self.logger.notice("[%s] -> Adjusting ring..." % btype)
self.adjust_ring(builder)
self.logger.notice("[%s] -> Rebalancing ring..." % btype)
rebalanced = self.rebalance_ring(builder)
if not rebalanced:
self.logger.notice("[%s] -> Rebalance: not ready!" % btype)
return True # we should sleep a bit longer
else:
self.logger.notice("[%s] -> Rebalance: ok" % btype)
else:
self.logger.notice(
"[%s] -> Current Ring balance: not ready!" % btype)
self.logger.notice('[%s] -> Rebalancing ring with no '
'modifications...' % btype)
rebalanced = self.rebalance_ring(builder)
if not rebalanced:
self.logger.notice(
"[%s] -> Rebalance: not ready!" % btype)
return True # we should sleep a bit longer
else:
self.logger.notice("[%s] -> Rebalance: ok" % btype)
self.logger.notice("[%s] -> Writing builder..." % btype)
try:
builder_md5 = self.write_builder(btype, builder)
self.logger.notice('[%s] --> Wrote new builder with md5: '
'%s' % (btype, builder_md5))
self.logger.notice("[%s] -> Writing ring..." % btype)
ring_md5 = self.write_ring(btype, builder)
self.logger.notice("[%s] --> Wrote new ring with md5: %s" %
(btype, ring_md5))
self._emit_notify('%s ring change' % btype,
'Wrote new ring with md5: %s' % ring_md5)
return True
except Exception:
self.logger.exception('Error dumping builder or ring')
else:
self.logger.notice("[%s] -> No ring change required" % btype)
return False
def start(self):
"""Start up the ring master"""
self.logger.notice("Ring-Master starting up")
self.logger.notice("-> Entering ring orchestration loop.")
while True:
try:
self.pause_if_asked()
if self.in_change_window():
for btype in sorted(self.builder_files.keys()):
with lock_parent_directory(self.builder_files[btype],
self.lock_timeout):
ring_changed = self.orchestration_pass(btype)
if ring_changed:
sleep(self.recheck_after_change_interval)
else:
sleep(self.recheck_interval)
else:
self.logger.debug('Not in change window')
sleep(60)
except exceptions.LockTimeout:
self.logger.exception('Orchestration LockTimeout Encountered')
except Exception:
self.logger.exception('Orchestration Error')
sleep(60)
sleep(1)
