if debug:
self.log('health:\n{h}'.format(h=out))
return json.loads(out)
+
+ ## metadata servers
+
+ def kill_mds(self, mds):
+ self.ctx.daemons.get_daemon('mds', mds).stop()
+
+ def kill_mds_by_rank(self, rank):
+ status = self.get_mds_status_by_rank(rank)
+ self.ctx.daemons.get_daemon('mds', status['name']).stop()
+
+ def revive_mds(self, mds, standby_for_rank=None):
+ args = []
+ if standby_for_rank:
+ args.extend(['--hot-standby', standby_for_rank])
+ self.ctx.daemons.get_daemon('mds', mds).restart(*args)
+
+ def revive_mds_by_rank(self, rank, standby_for_rank=None):
+ args = []
+ if standby_for_rank:
+ args.extend(['--hot-standby', standby_for_rank])
+ status = self.get_mds_status_by_rank(rank)
+ self.ctx.daemons.get_daemon('mds', status['name']).restart(*args)
+
+ def get_mds_status(self, mds):
+ out = self.raw_cluster_cmd('mds', 'dump', '--format=json')
+ j = json.loads(' '.join(out.splitlines()[1:]))
+ # collate; for dup ids, larger gid wins.
+ for info in j['info'].itervalues():
+ if info['name'] == mds:
+ return info
+ return None
+
+ def get_mds_status_by_rank(self, rank):
+ out = self.raw_cluster_cmd('mds', 'dump', '--format=json')
+ j = json.loads(' '.join(out.splitlines()[1:]))
+ # collate; for dup ids, larger gid wins.
+ for info in j['info'].itervalues():
+ if info['rank'] == rank:
+ return info
+ return None
+
+ def get_mds_status_all(self):
+ out = self.raw_cluster_cmd('mds', 'dump', '--format=json')
+ j = json.loads(' '.join(out.splitlines()[1:]))
+ return j
--- /dev/null
+import logging
+import contextlib
+import ceph_manager
+import random
+import time
+import gevent
+from teuthology import misc as teuthology
+
+log = logging.getLogger(__name__)
+
+class MDSThrasher:
+ """
+ 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):
+ self.ctx = ctx
+ self.manager = manager
+ self.manager.wait_for_clean()
+
+ self.stopping = False
+ 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.thread = gevent.spawn(self.do_thrash)
+
+ self.failure_group = failure_group
+ self.weight = weight
+
+ def log(self, x):
+ self.logger.info(x)
+
+ def do_join(self):
+ self.stopping = True
+ self.thread.get()
+
+ def do_thrash(self):
+ 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:
+ 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))
+ time.sleep(delay)
+
+ 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=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['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
+ status = {}
+ last_laggy_since = None
+ 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))
+ 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
+ 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
+
+ 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)
+ managers = {}
+ 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'),
+ )
+
+ statuses = {m : manager.get_mds_status(m) for m in mdslist}
+ statuses_by_rank = {s['rank'] : s for (_,s) in statuses.iteritems()}
+
+ log.info('Wait for all MDSs to reach steady state...')
+ # make sure everyone is in active, standby, or standby-replay
+ while True:
+ ready = filter(lambda (_,s): 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)
+
+ 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)
+ thrashers[active] = 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)
+ # 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].do_join()
+ log.info('done joining')
projects / ceph.git / commitdiff