mirror of
https://github.com/ceph/ceph
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427 lines
17 KiB
Python
427 lines
17 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 itertools
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import random
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import time
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from gevent import sleep
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from teuthology import misc as teuthology
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from tasks import ceph_manager
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from tasks.cephfs.filesystem import MDSCluster, Filesystem, FSMissing
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from tasks.thrasher import ThrasherGreenlet
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log = logging.getLogger(__name__)
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class MDSThrasher(ThrasherGreenlet):
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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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max_thrash: [default: 1] the maximum number of active MDSs per FS 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_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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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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randomize: [default: true] enables randomization and use the max/min values
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seed: [no default] seed the random number generator
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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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thrash_max_mds: [default: 0.05] likelihood that the max_mds of the mds
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cluster will be modified to a value [1, current) or (current, starting
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max_mds]. Value should be between 0.0 and 1.0.
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thrash_while_stopping: [default: false] thrash an MDS while there
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are MDS in up:stopping (because max_mds was changed and some
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MDS were deactivated).
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thrash_weights: allows specific MDSs to be thrashed more/less frequently.
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This option overrides anything specified by max_thrash. This option is a
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dict containing mds.x: weight pairs. For example, [mds.a: 0.7, mds.b:
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0.3, mds.c: 0.0]. Each weight is a value from 0.0 to 1.0. Any MDSs not
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specified will be automatically given a weight of 0.0 (not thrashed).
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For a given MDS, by default the trasher delays for up to
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max_thrash_delay, trashes, waits for the MDS to recover, and iterates.
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If a non-zero weight is specified for an MDS, for each iteration the
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thrasher chooses whether to thrash during that iteration based on a
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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, fs, max_mds):
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super(MDSThrasher, self).__init__()
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self.config = config
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self.ctx = ctx
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self.logger = log.getChild('fs.[{f}]'.format(f = fs.name))
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self.fs = fs
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self.manager = manager
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self.max_mds = max_mds
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self.name = 'thrasher.fs.[{f}]'.format(f = fs.name)
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self.randomize = bool(self.config.get('randomize', True))
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self.thrash_max_mds = float(self.config.get('thrash_max_mds', 0.05))
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self.max_thrash = int(self.config.get('max_thrash', 1))
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self.max_thrash_delay = float(self.config.get('thrash_delay', 120.0))
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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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def _run(self):
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try:
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self.do_thrash()
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except FSMissing:
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pass
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except Exception as e:
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# Log exceptions here so we get the full backtrace (gevent loses them).
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# Also allow successful completion as gevent exception handling is a broken mess:
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#
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# 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)
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# 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
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# self.print_exception(context, type, value, tb)
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# 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
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# traceback.print_exception(type, value, tb, file=errstream)
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# File "/usr/lib/python2.7/traceback.py", line 124, in print_exception
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# _print(file, 'Traceback (most recent call last):')
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# File "/usr/lib/python2.7/traceback.py", line 13, in _print
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# file.write(str+terminator)
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# 2017-02-03T14:34:01.261 CRITICAL:root:IOError
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self.set_thrasher_exception(e)
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self.logger.exception("exception:")
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# allow successful completion so gevent doesn't see an exception...
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def log(self, x):
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"""Write data to the logger assigned to MDSThrasher"""
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self.logger.info(x)
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def kill_mds(self, mds):
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if self.config.get('powercycle'):
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(remote,) = (self.ctx.cluster.only('mds.{m}'.format(m=mds)).
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remotes.keys())
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self.log('kill_mds on mds.{m} doing powercycle of {s}'.
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format(m=mds, s=remote.name))
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self._assert_ipmi(remote)
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remote.console.power_off()
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else:
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self.ctx.daemons.get_daemon('mds', mds).stop()
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@staticmethod
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def _assert_ipmi(remote):
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assert remote.console.has_ipmi_credentials, (
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"powercycling requested but RemoteConsole is not "
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"initialized. Check ipmi config.")
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def revive_mds(self, mds):
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"""
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Revive mds -- do an ipmpi powercycle (if indicated by the config)
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and then restart.
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"""
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if self.config.get('powercycle'):
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(remote,) = (self.ctx.cluster.only('mds.{m}'.format(m=mds)).
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remotes.keys())
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self.log('revive_mds on mds.{m} doing powercycle of {s}'.
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format(m=mds, s=remote.name))
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self._assert_ipmi(remote)
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remote.console.power_on()
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self.manager.make_admin_daemon_dir(self.ctx, remote)
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args = []
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self.ctx.daemons.get_daemon('mds', mds).restart(*args)
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def wait_for_stable(self, rank = None, gid = None):
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self.log('waiting for mds cluster to stabilize...')
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for itercount in itertools.count():
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status = self.fs.status()
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max_mds = status.get_fsmap(self.fs.id)['mdsmap']['max_mds']
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ranks = list(status.get_ranks(self.fs.id))
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stopping = sum(1 for _ in ranks if "up:stopping" == _['state'])
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actives = sum(1 for _ in ranks
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if "up:active" == _['state'] and "laggy_since" not in _)
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if not bool(self.config.get('thrash_while_stopping', False)) and stopping > 0:
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if itercount % 5 == 0:
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self.log('cluster is considered unstable while MDS are in up:stopping (!thrash_while_stopping)')
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else:
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if rank is not None:
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try:
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info = status.get_rank(self.fs.id, rank)
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if info['gid'] != gid and "up:active" == info['state']:
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self.log('mds.{name} has gained rank={rank}, replacing gid={gid}'.format(name = info['name'], rank = rank, gid = gid))
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return status
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except:
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pass # no rank present
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if actives >= max_mds:
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# no replacement can occur!
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self.log("cluster has {actives} actives (max_mds is {max_mds}), no MDS can replace rank {rank}".format(
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actives=actives, max_mds=max_mds, rank=rank))
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return status
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else:
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if actives == max_mds:
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self.log('mds cluster has {count} alive and active, now stable!'.format(count = actives))
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return status, None
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if itercount > 300/2: # 5 minutes
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raise RuntimeError('timeout waiting for cluster to stabilize')
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elif itercount % 5 == 0:
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self.log('mds map: {status}'.format(status=status))
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else:
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self.log('no change')
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sleep(2)
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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 fs {fs}'.format(fs = self.fs.name))
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stats = {
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"max_mds": 0,
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"deactivate": 0,
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"kill": 0,
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}
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while not self.is_stopped:
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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.sleep_unless_stopped(delay)
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status = self.fs.status()
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if random.random() <= self.thrash_max_mds:
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max_mds = status.get_fsmap(self.fs.id)['mdsmap']['max_mds']
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options = [i for i in range(1, self.max_mds + 1) if i != max_mds]
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if len(options) > 0:
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new_max_mds = random.choice(options)
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self.log('thrashing max_mds: %d -> %d' % (max_mds, new_max_mds))
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self.fs.set_max_mds(new_max_mds)
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stats['max_mds'] += 1
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self.wait_for_stable()
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count = 0
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for info in status.get_ranks(self.fs.id):
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name = info['name']
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label = 'mds.' + name
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rank = info['rank']
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gid = info['gid']
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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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count = count + 1
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if 'thrash_weights' not in self.config and count > self.max_thrash:
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break
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weight = 1.0
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if 'thrash_weights' in self.config:
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weight = self.config['thrash_weights'].get(label, '0.0')
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skip = random.random()
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if weight <= skip:
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self.log('skipping thrash iteration with skip ({skip}) > weight ({weight})'.format(skip=skip, weight=weight))
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continue
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self.log('kill {label} (rank={rank})'.format(label=label, rank=rank))
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self.kill_mds(name)
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stats['kill'] += 1
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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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status = self.fs.status()
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info = status.get_mds(name)
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if not info:
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break
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if 'laggy_since' in info:
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last_laggy_since = info['laggy_since']
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break
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if any([(f == name) for f in status.get_fsmap(self.fs.id)['mdsmap']['failed']]):
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break
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self.log(
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'waiting till mds map indicates {label} is laggy/crashed, in failed state, or {label} is removed from mdsmap'.format(
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label=label))
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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=status))
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sleep(2)
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if last_laggy_since:
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self.log(
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'{label} reported laggy/crashed since: {since}'.format(label=label, since=last_laggy_since))
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else:
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self.log('{label} down, removed from mdsmap'.format(label=label))
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# wait for a standby mds to takeover and become active
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status = self.wait_for_stable(rank, gid)
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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 {label}'.format(
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delay=delay, label=label))
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self.sleep_unless_stopped(delay)
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self.log('reviving {label}'.format(label=label))
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self.revive_mds(name)
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for itercount in itertools.count():
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if itercount > 300/2: # 5 minutes
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raise RuntimeError('timeout waiting for MDS to revive')
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status = self.fs.status()
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info = status.get_mds(name)
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if info and info['state'] in ('up:standby', 'up:standby-replay', 'up:active'):
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self.log('{label} reported in {state} state'.format(label=label, state=info['state']))
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break
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self.log(
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'waiting till mds map indicates {label} is in active, standby or standby-replay'.format(label=label))
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self.sleep_unless_stopped(2)
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for stat in stats:
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self.log("stat['{key}'] = {value}".format(key = stat, value = stats[stat]))
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# don't do replay thrashing right now
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# for info in status.get_replays(self.fs.id):
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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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# sleep(delay)
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# self.log('kill replaying mds.{id}'.format(id=self.to_kill))
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# self.kill_mds(self.to_kill)
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#
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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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#
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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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# sleep(delay)
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#
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# self.log('revive mds.{id}'.format(id=self.to_kill))
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# self.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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mds_cluster = MDSCluster(ctx)
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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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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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(first,) = ctx.cluster.only('mds.{_id}'.format(_id=mdslist[0])).remotes.keys()
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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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status = mds_cluster.status()
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while True:
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steady = True
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for info in status.get_all():
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state = info['state']
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if state not in ('up:active', 'up:standby', 'up:standby-replay'):
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steady = False
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break
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if steady:
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break
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sleep(2)
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status = mds_cluster.status()
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log.info('Ready to start thrashing')
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manager.wait_for_clean()
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assert manager.is_clean()
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if 'cluster' not in config:
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config['cluster'] = 'ceph'
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for fs in status.get_filesystems():
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thrasher = MDSThrasher(ctx, manager, config, Filesystem(ctx, fscid=fs['id']), fs['mdsmap']['max_mds'])
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thrasher.start()
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ctx.ceph[config['cluster']].thrashers.append(thrasher)
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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_thrasher')
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thrasher.stop()
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if thrasher.exception is not None:
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raise RuntimeError('error during thrashing')
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thrasher.join()
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log.info('done joining')
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