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Diffstat (limited to 'qa/tasks/mds_thrash.py')
| -rw-r--r-- | qa/tasks/mds_thrash.py | 434 |
1 files changed, 434 insertions, 0 deletions
diff --git a/qa/tasks/mds_thrash.py b/qa/tasks/mds_thrash.py new file mode 100644 index 000000000..7b7b420f9 --- /dev/null +++ b/qa/tasks/mds_thrash.py @@ -0,0 +1,434 @@ +""" +Thrash mds by simulating failures +""" +import logging +import contextlib +import itertools +import random +import time + +from gevent import sleep +from gevent.greenlet import Greenlet +from gevent.event import Event +from teuthology import misc as teuthology + +from tasks import ceph_manager +from tasks.cephfs.filesystem import MDSCluster, Filesystem, FSMissing +from tasks.thrasher import Thrasher + +log = logging.getLogger(__name__) + +class MDSThrasher(Thrasher, 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: + + max_thrash: [default: 1] the maximum number of active MDSs per FS that will be thrashed at + any given time. + + max_thrash_delay: [default: 30] maximum number of seconds to delay before + thrashing again. + + max_replay_thrash_delay: [default: 4] maximum number of seconds to delay while in + the replay state before thrashing. + + max_revive_delay: [default: 10] maximum number of seconds to delay before + bringing back a thrashed MDS. + + randomize: [default: true] enables randomization and use the max/min values + + seed: [no default] seed the random number generator + + thrash_in_replay: [default: 0.0] likelihood that the MDS will be thrashed + during replay. Value should be between 0.0 and 1.0. + + thrash_max_mds: [default: 0.05] likelihood that the max_mds of the mds + cluster will be modified to a value [1, current) or (current, starting + max_mds]. Value should be between 0.0 and 1.0. + + thrash_while_stopping: [default: false] thrash an MDS while there + are MDS in up:stopping (because max_mds was changed and some + MDS were deactivated). + + 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 (not thrashed). + 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, fs, max_mds): + super(MDSThrasher, self).__init__() + + self.config = config + self.ctx = ctx + self.logger = log.getChild('fs.[{f}]'.format(f = fs.name)) + self.fs = fs + self.manager = manager + self.max_mds = max_mds + self.name = 'thrasher.fs.[{f}]'.format(f = fs.name) + self.stopping = Event() + + self.randomize = bool(self.config.get('randomize', True)) + self.thrash_max_mds = float(self.config.get('thrash_max_mds', 0.05)) + self.max_thrash = int(self.config.get('max_thrash', 1)) + self.max_thrash_delay = float(self.config.get('thrash_delay', 120.0)) + 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)) + + def _run(self): + try: + self.do_thrash() + except FSMissing: + pass + except Exception as e: + # Log exceptions here so we get the full backtrace (gevent loses them). + # Also allow successful completion as gevent exception handling is a broken mess: + # + # 2017-02-03T14:34:01.259 CRITICAL:root: File "gevent.libev.corecext.pyx", line 367, in gevent.libev.corecext.loop.handle_error (src/gevent/libev/gevent.corecext.c:5051) + # File "/home/teuthworker/src/git.ceph.com_git_teuthology_master/virtualenv/local/lib/python2.7/site-packages/gevent/hub.py", line 558, in handle_error + # self.print_exception(context, type, value, tb) + # File "/home/teuthworker/src/git.ceph.com_git_teuthology_master/virtualenv/local/lib/python2.7/site-packages/gevent/hub.py", line 605, in print_exception + # traceback.print_exception(type, value, tb, file=errstream) + # File "/usr/lib/python2.7/traceback.py", line 124, in print_exception + # _print(file, 'Traceback (most recent call last):') + # File "/usr/lib/python2.7/traceback.py", line 13, in _print + # file.write(str+terminator) + # 2017-02-03T14:34:01.261 CRITICAL:root:IOError + self.set_thrasher_exception(e) + self.logger.exception("exception:") + # allow successful completion so gevent doesn't see an exception... + + def log(self, x): + """Write data to the logger assigned to MDSThrasher""" + self.logger.info(x) + + def stop(self): + self.stopping.set() + + def kill_mds(self, mds): + if self.config.get('powercycle'): + (remote,) = (self.ctx.cluster.only('mds.{m}'.format(m=mds)). + remotes.keys()) + self.log('kill_mds on mds.{m} doing powercycle of {s}'. + format(m=mds, s=remote.name)) + self._assert_ipmi(remote) + remote.console.power_off() + else: + self.ctx.daemons.get_daemon('mds', mds).stop() + + @staticmethod + def _assert_ipmi(remote): + assert remote.console.has_ipmi_credentials, ( + "powercycling requested but RemoteConsole is not " + "initialized. Check ipmi config.") + + def revive_mds(self, mds): + """ + Revive mds -- do an ipmpi powercycle (if indicated by the config) + and then restart. + """ + if self.config.get('powercycle'): + (remote,) = (self.ctx.cluster.only('mds.{m}'.format(m=mds)). + remotes.keys()) + self.log('revive_mds on mds.{m} doing powercycle of {s}'. + format(m=mds, s=remote.name)) + self._assert_ipmi(remote) + remote.console.power_on() + self.manager.make_admin_daemon_dir(self.ctx, remote) + args = [] + self.ctx.daemons.get_daemon('mds', mds).restart(*args) + + def wait_for_stable(self, rank = None, gid = None): + self.log('waiting for mds cluster to stabilize...') + for itercount in itertools.count(): + status = self.fs.status() + max_mds = status.get_fsmap(self.fs.id)['mdsmap']['max_mds'] + ranks = list(status.get_ranks(self.fs.id)) + stopping = sum(1 for _ in ranks if "up:stopping" == _['state']) + actives = sum(1 for _ in ranks + if "up:active" == _['state'] and "laggy_since" not in _) + + if not bool(self.config.get('thrash_while_stopping', False)) and stopping > 0: + if itercount % 5 == 0: + self.log('cluster is considered unstable while MDS are in up:stopping (!thrash_while_stopping)') + else: + if rank is not None: + try: + info = status.get_rank(self.fs.id, rank) + if info['gid'] != gid and "up:active" == info['state']: + self.log('mds.{name} has gained rank={rank}, replacing gid={gid}'.format(name = info['name'], rank = rank, gid = gid)) + return status + except: + pass # no rank present + if actives >= max_mds: + # no replacement can occur! + self.log("cluster has {actives} actives (max_mds is {max_mds}), no MDS can replace rank {rank}".format( + actives=actives, max_mds=max_mds, rank=rank)) + return status + else: + if actives == max_mds: + self.log('mds cluster has {count} alive and active, now stable!'.format(count = actives)) + return status, None + if itercount > 300/2: # 5 minutes + raise RuntimeError('timeout waiting for cluster to stabilize') + elif itercount % 5 == 0: + self.log('mds map: {status}'.format(status=status)) + else: + self.log('no change') + sleep(2) + + def do_thrash(self): + """ + Perform the random thrashing action + """ + + self.log('starting mds_do_thrash for fs {fs}'.format(fs = self.fs.name)) + stats = { + "max_mds": 0, + "deactivate": 0, + "kill": 0, + } + + 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 + + status = self.fs.status() + + if random.random() <= self.thrash_max_mds: + max_mds = status.get_fsmap(self.fs.id)['mdsmap']['max_mds'] + options = [i for i in range(1, self.max_mds + 1) if i != max_mds] + if len(options) > 0: + new_max_mds = random.choice(options) + self.log('thrashing max_mds: %d -> %d' % (max_mds, new_max_mds)) + self.fs.set_max_mds(new_max_mds) + stats['max_mds'] += 1 + self.wait_for_stable() + + count = 0 + for info in status.get_ranks(self.fs.id): + name = info['name'] + label = 'mds.' + name + rank = info['rank'] + gid = info['gid'] + + # if thrash_weights isn't specified and we've reached max_thrash, + # we're done + count = count + 1 + if 'thrash_weights' not in self.config and count > self.max_thrash: + break + + weight = 1.0 + if 'thrash_weights' in self.config: + weight = self.config['thrash_weights'].get(label, '0.0') + skip = random.random() + if weight <= skip: + self.log('skipping thrash iteration with skip ({skip}) > weight ({weight})'.format(skip=skip, weight=weight)) + continue + + self.log('kill {label} (rank={rank})'.format(label=label, rank=rank)) + self.kill_mds(name) + stats['kill'] += 1 + + # wait for mon to report killed mds as crashed + last_laggy_since = None + itercount = 0 + while True: + status = self.fs.status() + info = status.get_mds(name) + if not info: + break + if 'laggy_since' in info: + last_laggy_since = info['laggy_since'] + break + if any([(f == name) for f in status.get_fsmap(self.fs.id)['mdsmap']['failed']]): + break + self.log( + 'waiting till mds map indicates {label} is laggy/crashed, in failed state, or {label} is removed from mdsmap'.format( + label=label)) + itercount = itercount + 1 + if itercount > 10: + self.log('mds map: {status}'.format(status=status)) + sleep(2) + + if last_laggy_since: + self.log( + '{label} reported laggy/crashed since: {since}'.format(label=label, since=last_laggy_since)) + else: + self.log('{label} down, removed from mdsmap'.format(label=label)) + + # wait for a standby mds to takeover and become active + status = self.wait_for_stable(rank, gid) + + # 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 {label}'.format( + delay=delay, label=label)) + sleep(delay) + + self.log('reviving {label}'.format(label=label)) + self.revive_mds(name) + + for itercount in itertools.count(): + if itercount > 300/2: # 5 minutes + raise RuntimeError('timeout waiting for MDS to revive') + status = self.fs.status() + info = status.get_mds(name) + if info and info['state'] in ('up:standby', 'up:standby-replay', 'up:active'): + self.log('{label} reported in {state} state'.format(label=label, state=info['state'])) + break + self.log( + 'waiting till mds map indicates {label} is in active, standby or standby-replay'.format(label=label)) + sleep(2) + + for stat in stats: + self.log("stat['{key}'] = {value}".format(key = stat, value = stats[stat])) + + # don't do replay thrashing right now +# for info in status.get_replays(self.fs.id): +# # 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) +# sleep(delay) +# self.log('kill replaying mds.{id}'.format(id=self.to_kill)) +# self.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)) +# sleep(delay) +# +# self.log('revive mds.{id}'.format(id=self.to_kill)) +# self.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. + """ + + mds_cluster = MDSCluster(ctx) + + 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 + 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) + + (first,) = ctx.cluster.only('mds.{_id}'.format(_id=mdslist[0])).remotes.keys() + 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...') + status = mds_cluster.status() + while True: + steady = True + for info in status.get_all(): + state = info['state'] + if state not in ('up:active', 'up:standby', 'up:standby-replay'): + steady = False + break + if steady: + break + sleep(2) + status = mds_cluster.status() + log.info('Ready to start thrashing') + + manager.wait_for_clean() + assert manager.is_clean() + + if 'cluster' not in config: + config['cluster'] = 'ceph' + + for fs in status.get_filesystems(): + thrasher = MDSThrasher(ctx, manager, config, Filesystem(ctx, fscid=fs['id']), fs['mdsmap']['max_mds']) + thrasher.start() + ctx.ceph[config['cluster']].thrashers.append(thrasher) + + try: + log.debug('Yielding') + yield + finally: + log.info('joining mds_thrasher') + thrasher.stop() + if thrasher.exception is not None: + raise RuntimeError('error during thrashing') + thrasher.join() + log.info('done joining') |