mirror of
https://github.com/ceph/ceph
synced 2024-12-26 21:43:10 +00:00
353 lines
14 KiB
Python
353 lines
14 KiB
Python
"""
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Thrash mds by simulating failures
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"""
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import logging
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import contextlib
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import ceph_manager
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import random
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import time
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from gevent.greenlet import Greenlet
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from gevent.event import Event
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from teuthology import misc as teuthology
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log = logging.getLogger(__name__)
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class MDSThrasher(Greenlet):
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"""
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MDSThrasher::
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The MDSThrasher thrashes MDSs during execution of other tasks (workunits, etc).
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The config is optional. Many of the config parameters are a a maximum value
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to use when selecting a random value from a range. To always use the maximum
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value, set no_random to true. The config is a dict containing some or all of:
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seed: [no default] seed the random number generator
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randomize: [default: true] enables randomization and use the max/min values
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max_thrash: [default: 1] the maximum number of MDSs that will be thrashed at
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any given time.
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max_thrash_delay: [default: 30] maximum number of seconds to delay before
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thrashing again.
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max_revive_delay: [default: 10] maximum number of seconds to delay before
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bringing back a thrashed MDS
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thrash_in_replay: [default: 0.0] likelihood that the MDS will be thrashed
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during replay. Value should be between 0.0 and 1.0
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max_replay_thrash_delay: [default: 4] maximum number of seconds to delay while in
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the replay state before thrashing
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thrash_weights: allows specific MDSs to be thrashed more/less frequently. This option
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overrides anything specified by max_thrash. This option is a dict containing
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mds.x: weight pairs. For example, [mds.a: 0.7, mds.b: 0.3, mds.c: 0.0]. Each weight
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is a value from 0.0 to 1.0. Any MDSs not specified will be automatically
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given a weight of 0.0. For a given MDS, by default the trasher delays for up
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to max_thrash_delay, trashes, waits for the MDS to recover, and iterates. If a non-zero
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weight is specified for an MDS, for each iteration the thrasher chooses whether to thrash
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during that iteration based on a random value [0-1] not exceeding the weight of that MDS.
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Examples::
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The following example sets the likelihood that mds.a will be thrashed
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to 80%, mds.b to 20%, and other MDSs will not be thrashed. It also sets the
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likelihood that an MDS will be thrashed in replay to 40%.
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Thrash weights do not have to sum to 1.
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tasks:
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- ceph:
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- mds_thrash:
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thrash_weights:
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- mds.a: 0.8
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- mds.b: 0.2
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thrash_in_replay: 0.4
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- ceph-fuse:
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- workunit:
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clients:
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all: [suites/fsx.sh]
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The following example disables randomization, and uses the max delay values:
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tasks:
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- ceph:
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- mds_thrash:
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max_thrash_delay: 10
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max_revive_delay: 1
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max_replay_thrash_delay: 4
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"""
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def __init__(self, ctx, manager, config, logger, failure_group, weight):
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super(MDSThrasher, self).__init__()
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self.ctx = ctx
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self.manager = manager
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assert self.manager.is_clean()
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self.stopping = Event()
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self.logger = logger
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self.config = config
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self.randomize = bool(self.config.get('randomize', True))
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self.max_thrash_delay = float(self.config.get('thrash_delay', 30.0))
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self.thrash_in_replay = float(self.config.get('thrash_in_replay', False))
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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(
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v=self.thrash_in_replay)
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self.max_replay_thrash_delay = float(self.config.get('max_replay_thrash_delay', 4.0))
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self.max_revive_delay = float(self.config.get('max_revive_delay', 10.0))
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self.failure_group = failure_group
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self.weight = weight
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def _run(self):
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try:
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self.do_thrash()
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except:
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# Log exceptions here so we get the full backtrace (it's lost
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# by the time someone does a .get() on this greenlet)
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self.logger.exception("Exception in do_thrash:")
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raise
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def log(self, x):
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"""Write data to logger assigned to this MDThrasher"""
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self.logger.info(x)
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def stop(self):
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self.stopping.set()
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def do_thrash(self):
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"""
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Perform the random thrashing action
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"""
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self.log('starting mds_do_thrash for failure group: ' + ', '.join(
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['mds.{_id}'.format(_id=_f) for _f in self.failure_group]))
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while not self.stopping.is_set():
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delay = self.max_thrash_delay
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if self.randomize:
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delay = random.randrange(0.0, self.max_thrash_delay)
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if delay > 0.0:
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self.log('waiting for {delay} secs before thrashing'.format(delay=delay))
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self.stopping.wait(delay)
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if self.stopping.is_set():
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continue
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skip = random.randrange(0.0, 1.0)
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if self.weight < 1.0 and skip > self.weight:
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self.log('skipping thrash iteration with skip ({skip}) > weight ({weight})'.format(skip=skip,
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weight=self.weight))
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continue
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# find the active mds in the failure group
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statuses = [self.manager.get_mds_status(m) for m in self.failure_group]
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actives = filter(lambda s: s and s['state'] == 'up:active', statuses)
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assert len(actives) == 1, 'Can only have one active in a failure group'
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active_mds = actives[0]['name']
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active_rank = actives[0]['rank']
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self.log('kill mds.{id} (rank={r})'.format(id=active_mds, r=active_rank))
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self.manager.kill_mds_by_rank(active_rank)
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# wait for mon to report killed mds as crashed
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last_laggy_since = None
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itercount = 0
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while True:
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failed = self.manager.get_mds_status_all()['failed']
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status = self.manager.get_mds_status(active_mds)
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if not status:
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break
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if 'laggy_since' in status:
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last_laggy_since = status['laggy_since']
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break
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if any([(f == active_mds) for f in failed]):
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break
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self.log(
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'waiting till mds map indicates mds.{_id} is laggy/crashed, in failed state, or mds.{_id} is removed from mdsmap'.format(
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_id=active_mds))
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itercount = itercount + 1
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if itercount > 10:
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self.log('mds map: {status}'.format(status=self.manager.get_mds_status_all()))
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time.sleep(2)
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if last_laggy_since:
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self.log(
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'mds.{_id} reported laggy/crashed since: {since}'.format(_id=active_mds, since=last_laggy_since))
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else:
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self.log('mds.{_id} down, removed from mdsmap'.format(_id=active_mds, since=last_laggy_since))
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# wait for a standby mds to takeover and become active
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takeover_mds = None
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takeover_rank = None
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itercount = 0
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while True:
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statuses = [self.manager.get_mds_status(m) for m in self.failure_group]
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actives = filter(lambda s: s and s['state'] == 'up:active', statuses)
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if len(actives) > 0:
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assert len(actives) == 1, 'Can only have one active in failure group'
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takeover_mds = actives[0]['name']
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takeover_rank = actives[0]['rank']
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break
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itercount = itercount + 1
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if itercount > 10:
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self.log('mds map: {status}'.format(status=self.manager.get_mds_status_all()))
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self.log('New active mds is mds.{_id}'.format(_id=takeover_mds))
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# wait for a while before restarting old active to become new
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# standby
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delay = self.max_revive_delay
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if self.randomize:
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delay = random.randrange(0.0, self.max_revive_delay)
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self.log('waiting for {delay} secs before reviving mds.{id}'.format(
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delay=delay, id=active_mds))
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time.sleep(delay)
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self.log('reviving mds.{id}'.format(id=active_mds))
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self.manager.revive_mds(active_mds, standby_for_rank=takeover_rank)
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status = {}
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while True:
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status = self.manager.get_mds_status(active_mds)
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if status and (status['state'] == 'up:standby' or status['state'] == 'up:standby-replay'):
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break
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self.log(
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'waiting till mds map indicates mds.{_id} is in standby or standby-replay'.format(_id=active_mds))
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time.sleep(2)
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self.log('mds.{_id} reported in {state} state'.format(_id=active_mds, state=status['state']))
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# don't do replay thrashing right now
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continue
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# this might race with replay -> active transition...
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if status['state'] == 'up:replay' and random.randrange(0.0, 1.0) < self.thrash_in_replay:
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delay = self.max_replay_thrash_delay
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if self.randomize:
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delay = random.randrange(0.0, self.max_replay_thrash_delay)
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time.sleep(delay)
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self.log('kill replaying mds.{id}'.format(id=self.to_kill))
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self.manager.kill_mds(self.to_kill)
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delay = self.max_revive_delay
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if self.randomize:
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delay = random.randrange(0.0, self.max_revive_delay)
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self.log('waiting for {delay} secs before reviving mds.{id}'.format(
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delay=delay, id=self.to_kill))
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time.sleep(delay)
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self.log('revive mds.{id}'.format(id=self.to_kill))
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self.manager.revive_mds(self.to_kill)
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@contextlib.contextmanager
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def task(ctx, config):
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"""
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Stress test the mds by thrashing while another task/workunit
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is running.
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Please refer to MDSThrasher class for further information on the
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available options.
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"""
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if config is None:
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config = {}
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assert isinstance(config, dict), \
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'mds_thrash task only accepts a dict for configuration'
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mdslist = list(teuthology.all_roles_of_type(ctx.cluster, 'mds'))
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assert len(mdslist) > 1, \
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'mds_thrash task requires at least 2 metadata servers'
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# choose random seed
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seed = None
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if 'seed' in config:
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seed = int(config['seed'])
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else:
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seed = int(time.time())
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log.info('mds thrasher using random seed: {seed}'.format(seed=seed))
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random.seed(seed)
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max_thrashers = config.get('max_thrash', 1)
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thrashers = {}
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(first,) = ctx.cluster.only('mds.{_id}'.format(_id=mdslist[0])).remotes.iterkeys()
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manager = ceph_manager.CephManager(
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first, ctx=ctx, logger=log.getChild('ceph_manager'),
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)
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# make sure everyone is in active, standby, or standby-replay
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log.info('Wait for all MDSs to reach steady state...')
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statuses = None
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statuses_by_rank = None
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while True:
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statuses = {m: manager.get_mds_status(m) for m in mdslist}
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statuses_by_rank = {}
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for _, s in statuses.iteritems():
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if isinstance(s, dict):
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statuses_by_rank[s['rank']] = s
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ready = filter(lambda (_, s): s is not None and (s['state'] == 'up:active'
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or s['state'] == 'up:standby'
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or s['state'] == 'up:standby-replay'),
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statuses.items())
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if len(ready) == len(statuses):
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break
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time.sleep(2)
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log.info('Ready to start thrashing')
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# setup failure groups
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failure_groups = {}
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actives = {s['name']: s for (_, s) in statuses.iteritems() if s['state'] == 'up:active'}
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log.info('Actives is: {d}'.format(d=actives))
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log.info('Statuses is: {d}'.format(d=statuses_by_rank))
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for active in actives:
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for (r, s) in statuses.iteritems():
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if s['standby_for_name'] == active:
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if not active in failure_groups:
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failure_groups[active] = []
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log.info('Assigning mds rank {r} to failure group {g}'.format(r=r, g=active))
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failure_groups[active].append(r)
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manager.wait_for_clean()
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for (active, standbys) in failure_groups.iteritems():
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weight = 1.0
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if 'thrash_weights' in config:
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weight = int(config['thrash_weights'].get('mds.{_id}'.format(_id=active), '0.0'))
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failure_group = [active]
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failure_group.extend(standbys)
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thrasher = MDSThrasher(
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ctx, manager, config,
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logger=log.getChild('mds_thrasher.failure_group.[{a}, {sbs}]'.format(
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a=active,
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sbs=', '.join(standbys)
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)
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),
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failure_group=failure_group,
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weight=weight)
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thrasher.start()
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thrashers[active] = thrasher
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# if thrash_weights isn't specified and we've reached max_thrash,
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# we're done
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if not 'thrash_weights' in config and len(thrashers) == max_thrashers:
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break
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try:
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log.debug('Yielding')
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yield
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finally:
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log.info('joining mds_thrashers')
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for t in thrashers:
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log.info('join thrasher for failure group [{fg}]'.format(fg=', '.join(failure_group)))
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thrashers[t].stop()
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thrashers[t].join()
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log.info('done joining')
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