mirror of
https://github.com/ceph/ceph
synced 2024-12-29 15:03:33 +00:00
353 lines
14 KiB
Python
353 lines
14 KiB
Python
"""
|
|
Thrash mds by simulating failures
|
|
"""
|
|
import logging
|
|
import contextlib
|
|
import ceph_manager
|
|
import random
|
|
import time
|
|
from gevent.greenlet import Greenlet
|
|
from gevent.event import Event
|
|
from teuthology import misc as teuthology
|
|
|
|
log = logging.getLogger(__name__)
|
|
|
|
|
|
class MDSThrasher(Greenlet):
|
|
"""
|
|
MDSThrasher::
|
|
|
|
The MDSThrasher thrashes MDSs during execution of other tasks (workunits, etc).
|
|
|
|
The config is optional. Many of the config parameters are a a maximum value
|
|
to use when selecting a random value from a range. To always use the maximum
|
|
value, set no_random to true. The config is a dict containing some or all of:
|
|
|
|
seed: [no default] seed the random number generator
|
|
|
|
randomize: [default: true] enables randomization and use the max/min values
|
|
|
|
max_thrash: [default: 1] the maximum number of MDSs that will be thrashed at
|
|
any given time.
|
|
|
|
max_thrash_delay: [default: 30] maximum number of seconds to delay before
|
|
thrashing again.
|
|
|
|
max_revive_delay: [default: 10] maximum number of seconds to delay before
|
|
bringing back a thrashed MDS
|
|
|
|
thrash_in_replay: [default: 0.0] likelihood that the MDS will be thrashed
|
|
during replay. Value should be between 0.0 and 1.0
|
|
|
|
max_replay_thrash_delay: [default: 4] maximum number of seconds to delay while in
|
|
the replay state before thrashing
|
|
|
|
thrash_weights: allows specific MDSs to be thrashed more/less frequently. This option
|
|
overrides anything specified by max_thrash. This option is a dict containing
|
|
mds.x: weight pairs. For example, [mds.a: 0.7, mds.b: 0.3, mds.c: 0.0]. Each weight
|
|
is a value from 0.0 to 1.0. Any MDSs not specified will be automatically
|
|
given a weight of 0.0. For a given MDS, by default the trasher delays for up
|
|
to max_thrash_delay, trashes, waits for the MDS to recover, and iterates. If a non-zero
|
|
weight is specified for an MDS, for each iteration the thrasher chooses whether to thrash
|
|
during that iteration based on a random value [0-1] not exceeding the weight of that MDS.
|
|
|
|
Examples::
|
|
|
|
|
|
The following example sets the likelihood that mds.a will be thrashed
|
|
to 80%, mds.b to 20%, and other MDSs will not be thrashed. It also sets the
|
|
likelihood that an MDS will be thrashed in replay to 40%.
|
|
Thrash weights do not have to sum to 1.
|
|
|
|
tasks:
|
|
- ceph:
|
|
- mds_thrash:
|
|
thrash_weights:
|
|
- mds.a: 0.8
|
|
- mds.b: 0.2
|
|
thrash_in_replay: 0.4
|
|
- ceph-fuse:
|
|
- workunit:
|
|
clients:
|
|
all: [suites/fsx.sh]
|
|
|
|
The following example disables randomization, and uses the max delay values:
|
|
|
|
tasks:
|
|
- ceph:
|
|
- mds_thrash:
|
|
max_thrash_delay: 10
|
|
max_revive_delay: 1
|
|
max_replay_thrash_delay: 4
|
|
|
|
"""
|
|
|
|
def __init__(self, ctx, manager, config, logger, failure_group, weight):
|
|
super(MDSThrasher, self).__init__()
|
|
|
|
self.ctx = ctx
|
|
self.manager = manager
|
|
assert self.manager.is_clean()
|
|
|
|
self.stopping = Event()
|
|
self.logger = logger
|
|
self.config = config
|
|
|
|
self.randomize = bool(self.config.get('randomize', True))
|
|
self.max_thrash_delay = float(self.config.get('thrash_delay', 30.0))
|
|
self.thrash_in_replay = float(self.config.get('thrash_in_replay', False))
|
|
assert self.thrash_in_replay >= 0.0 and self.thrash_in_replay <= 1.0, 'thrash_in_replay ({v}) must be between [0.0, 1.0]'.format(
|
|
v=self.thrash_in_replay)
|
|
|
|
self.max_replay_thrash_delay = float(self.config.get('max_replay_thrash_delay', 4.0))
|
|
|
|
self.max_revive_delay = float(self.config.get('max_revive_delay', 10.0))
|
|
|
|
self.failure_group = failure_group
|
|
self.weight = weight
|
|
|
|
def _run(self):
|
|
try:
|
|
self.do_thrash()
|
|
except:
|
|
# Log exceptions here so we get the full backtrace (it's lost
|
|
# by the time someone does a .get() on this greenlet)
|
|
self.logger.exception("Exception in do_thrash:")
|
|
raise
|
|
|
|
def log(self, x):
|
|
"""Write data to logger assigned to this MDThrasher"""
|
|
self.logger.info(x)
|
|
|
|
def stop(self):
|
|
self.stopping.set()
|
|
|
|
def do_thrash(self):
|
|
"""
|
|
Perform the random thrashing action
|
|
"""
|
|
self.log('starting mds_do_thrash for failure group: ' + ', '.join(
|
|
['mds.{_id}'.format(_id=_f) for _f in self.failure_group]))
|
|
while not self.stopping.is_set():
|
|
delay = self.max_thrash_delay
|
|
if self.randomize:
|
|
delay = random.randrange(0.0, self.max_thrash_delay)
|
|
|
|
if delay > 0.0:
|
|
self.log('waiting for {delay} secs before thrashing'.format(delay=delay))
|
|
self.stopping.wait(delay)
|
|
if self.stopping.is_set():
|
|
continue
|
|
|
|
skip = random.randrange(0.0, 1.0)
|
|
if self.weight < 1.0 and skip > self.weight:
|
|
self.log('skipping thrash iteration with skip ({skip}) > weight ({weight})'.format(skip=skip,
|
|
weight=self.weight))
|
|
continue
|
|
|
|
# find the active mds in the failure group
|
|
statuses = [self.manager.get_mds_status(m) for m in self.failure_group]
|
|
actives = filter(lambda s: s and s['state'] == 'up:active', statuses)
|
|
assert len(actives) == 1, 'Can only have one active in a failure group'
|
|
|
|
active_mds = actives[0]['name']
|
|
active_rank = actives[0]['rank']
|
|
|
|
self.log('kill mds.{id} (rank={r})'.format(id=active_mds, r=active_rank))
|
|
self.manager.kill_mds_by_rank(active_rank)
|
|
|
|
# wait for mon to report killed mds as crashed
|
|
last_laggy_since = None
|
|
itercount = 0
|
|
while True:
|
|
failed = self.manager.get_mds_status_all()['failed']
|
|
status = self.manager.get_mds_status(active_mds)
|
|
if not status:
|
|
break
|
|
if 'laggy_since' in status:
|
|
last_laggy_since = status['laggy_since']
|
|
break
|
|
if any([(f == active_mds) for f in failed]):
|
|
break
|
|
self.log(
|
|
'waiting till mds map indicates mds.{_id} is laggy/crashed, in failed state, or mds.{_id} is removed from mdsmap'.format(
|
|
_id=active_mds))
|
|
itercount = itercount + 1
|
|
if itercount > 10:
|
|
self.log('mds map: {status}'.format(status=self.manager.get_mds_status_all()))
|
|
time.sleep(2)
|
|
if last_laggy_since:
|
|
self.log(
|
|
'mds.{_id} reported laggy/crashed since: {since}'.format(_id=active_mds, since=last_laggy_since))
|
|
else:
|
|
self.log('mds.{_id} down, removed from mdsmap'.format(_id=active_mds, since=last_laggy_since))
|
|
|
|
# wait for a standby mds to takeover and become active
|
|
takeover_mds = None
|
|
takeover_rank = None
|
|
itercount = 0
|
|
while True:
|
|
statuses = [self.manager.get_mds_status(m) for m in self.failure_group]
|
|
actives = filter(lambda s: s and s['state'] == 'up:active', statuses)
|
|
if len(actives) > 0:
|
|
assert len(actives) == 1, 'Can only have one active in failure group'
|
|
takeover_mds = actives[0]['name']
|
|
takeover_rank = actives[0]['rank']
|
|
break
|
|
itercount = itercount + 1
|
|
if itercount > 10:
|
|
self.log('mds map: {status}'.format(status=self.manager.get_mds_status_all()))
|
|
|
|
self.log('New active mds is mds.{_id}'.format(_id=takeover_mds))
|
|
|
|
# wait for a while before restarting old active to become new
|
|
# standby
|
|
delay = self.max_revive_delay
|
|
if self.randomize:
|
|
delay = random.randrange(0.0, self.max_revive_delay)
|
|
|
|
self.log('waiting for {delay} secs before reviving mds.{id}'.format(
|
|
delay=delay, id=active_mds))
|
|
time.sleep(delay)
|
|
|
|
self.log('reviving mds.{id}'.format(id=active_mds))
|
|
self.manager.revive_mds(active_mds, standby_for_rank=takeover_rank)
|
|
|
|
status = {}
|
|
while True:
|
|
status = self.manager.get_mds_status(active_mds)
|
|
if status and (status['state'] == 'up:standby' or status['state'] == 'up:standby-replay'):
|
|
break
|
|
self.log(
|
|
'waiting till mds map indicates mds.{_id} is in standby or standby-replay'.format(_id=active_mds))
|
|
time.sleep(2)
|
|
self.log('mds.{_id} reported in {state} state'.format(_id=active_mds, state=status['state']))
|
|
|
|
# don't do replay thrashing right now
|
|
continue
|
|
# this might race with replay -> active transition...
|
|
if status['state'] == 'up:replay' and random.randrange(0.0, 1.0) < self.thrash_in_replay:
|
|
|
|
delay = self.max_replay_thrash_delay
|
|
if self.randomize:
|
|
delay = random.randrange(0.0, self.max_replay_thrash_delay)
|
|
time.sleep(delay)
|
|
self.log('kill replaying mds.{id}'.format(id=self.to_kill))
|
|
self.manager.kill_mds(self.to_kill)
|
|
|
|
delay = self.max_revive_delay
|
|
if self.randomize:
|
|
delay = random.randrange(0.0, self.max_revive_delay)
|
|
|
|
self.log('waiting for {delay} secs before reviving mds.{id}'.format(
|
|
delay=delay, id=self.to_kill))
|
|
time.sleep(delay)
|
|
|
|
self.log('revive mds.{id}'.format(id=self.to_kill))
|
|
self.manager.revive_mds(self.to_kill)
|
|
|
|
|
|
@contextlib.contextmanager
|
|
def task(ctx, config):
|
|
"""
|
|
Stress test the mds by thrashing while another task/workunit
|
|
is running.
|
|
|
|
Please refer to MDSThrasher class for further information on the
|
|
available options.
|
|
"""
|
|
if config is None:
|
|
config = {}
|
|
assert isinstance(config, dict), \
|
|
'mds_thrash task only accepts a dict for configuration'
|
|
mdslist = list(teuthology.all_roles_of_type(ctx.cluster, 'mds'))
|
|
assert len(mdslist) > 1, \
|
|
'mds_thrash task requires at least 2 metadata servers'
|
|
|
|
# choose random seed
|
|
seed = None
|
|
if 'seed' in config:
|
|
seed = int(config['seed'])
|
|
else:
|
|
seed = int(time.time())
|
|
log.info('mds thrasher using random seed: {seed}'.format(seed=seed))
|
|
random.seed(seed)
|
|
|
|
max_thrashers = config.get('max_thrash', 1)
|
|
thrashers = {}
|
|
|
|
(first,) = ctx.cluster.only('mds.{_id}'.format(_id=mdslist[0])).remotes.iterkeys()
|
|
manager = ceph_manager.CephManager(
|
|
first, ctx=ctx, logger=log.getChild('ceph_manager'),
|
|
)
|
|
|
|
# make sure everyone is in active, standby, or standby-replay
|
|
log.info('Wait for all MDSs to reach steady state...')
|
|
statuses = None
|
|
statuses_by_rank = None
|
|
while True:
|
|
statuses = {m: manager.get_mds_status(m) for m in mdslist}
|
|
statuses_by_rank = {}
|
|
for _, s in statuses.iteritems():
|
|
if isinstance(s, dict):
|
|
statuses_by_rank[s['rank']] = s
|
|
|
|
ready = filter(lambda (_, s): s is not None and (s['state'] == 'up:active'
|
|
or s['state'] == 'up:standby'
|
|
or s['state'] == 'up:standby-replay'),
|
|
statuses.items())
|
|
if len(ready) == len(statuses):
|
|
break
|
|
time.sleep(2)
|
|
log.info('Ready to start thrashing')
|
|
|
|
# setup failure groups
|
|
failure_groups = {}
|
|
actives = {s['name']: s for (_, s) in statuses.iteritems() if s['state'] == 'up:active'}
|
|
log.info('Actives is: {d}'.format(d=actives))
|
|
log.info('Statuses is: {d}'.format(d=statuses_by_rank))
|
|
for active in actives:
|
|
for (r, s) in statuses.iteritems():
|
|
if s['standby_for_name'] == active:
|
|
if not active in failure_groups:
|
|
failure_groups[active] = []
|
|
log.info('Assigning mds rank {r} to failure group {g}'.format(r=r, g=active))
|
|
failure_groups[active].append(r)
|
|
|
|
manager.wait_for_clean()
|
|
for (active, standbys) in failure_groups.iteritems():
|
|
weight = 1.0
|
|
if 'thrash_weights' in config:
|
|
weight = int(config['thrash_weights'].get('mds.{_id}'.format(_id=active), '0.0'))
|
|
|
|
failure_group = [active]
|
|
failure_group.extend(standbys)
|
|
|
|
thrasher = MDSThrasher(
|
|
ctx, manager, config,
|
|
logger=log.getChild('mds_thrasher.failure_group.[{a}, {sbs}]'.format(
|
|
a=active,
|
|
sbs=', '.join(standbys)
|
|
)
|
|
),
|
|
failure_group=failure_group,
|
|
weight=weight)
|
|
thrasher.start()
|
|
thrashers[active] = thrasher
|
|
|
|
# if thrash_weights isn't specified and we've reached max_thrash,
|
|
# we're done
|
|
if not 'thrash_weights' in config and len(thrashers) == max_thrashers:
|
|
break
|
|
|
|
try:
|
|
log.debug('Yielding')
|
|
yield
|
|
finally:
|
|
log.info('joining mds_thrashers')
|
|
for t in thrashers:
|
|
log.info('join thrasher for failure group [{fg}]'.format(fg=', '.join(failure_group)))
|
|
thrashers[t].stop()
|
|
thrashers[t].join()
|
|
log.info('done joining')
|