mirror of
https://github.com/ceph/ceph
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556 lines
23 KiB
Python
556 lines
23 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 itertools
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import random
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import signal
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import time
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from gevent import sleep
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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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from tasks.cephfs.filesystem import MDSCluster, Filesystem
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log = logging.getLogger(__name__)
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class DaemonWatchdog(Greenlet):
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"""
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DaemonWatchdog::
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Watch Ceph daemons for failures. If an extended failure is detected (i.e.
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not intentional), then the watchdog will unmount file systems and send
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SIGTERM to all daemons. The duration of an extended failure is configurable
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with watchdog_daemon_timeout.
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watchdog_daemon_timeout [default: 300]: number of seconds a daemon
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is allowed to be failed before the watchdog will bark.
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"""
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def __init__(self, ctx, manager, config, thrashers):
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Greenlet.__init__(self)
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self.ctx = ctx
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self.config = config
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self.e = None
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self.logger = log.getChild('daemon_watchdog')
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self.manager = manager
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self.name = 'watchdog'
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self.stopping = Event()
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self.thrashers = thrashers
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def _run(self):
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try:
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self.watch()
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except Exception as e:
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# See _run exception comment for MDSThrasher
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self.e = 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 logger"""
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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 bark(self):
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self.log("BARK! unmounting mounts and killing all daemons")
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for mount in self.ctx.mounts.values():
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try:
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mount.umount_wait(force=True)
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except:
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self.logger.exception("ignoring exception:")
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daemons = []
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daemons.extend(filter(lambda daemon: daemon.running() and not daemon.proc.finished, self.ctx.daemons.iter_daemons_of_role('mds', cluster=self.manager.cluster)))
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daemons.extend(filter(lambda daemon: daemon.running() and not daemon.proc.finished, self.ctx.daemons.iter_daemons_of_role('mon', cluster=self.manager.cluster)))
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for daemon in daemons:
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try:
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daemon.signal(signal.SIGTERM)
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except:
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self.logger.exception("ignoring exception:")
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def watch(self):
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self.log("watchdog starting")
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daemon_timeout = int(self.config.get('watchdog_daemon_timeout', 300))
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daemon_failure_time = {}
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while not self.stopping.is_set():
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bark = False
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now = time.time()
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mons = self.ctx.daemons.iter_daemons_of_role('mon', cluster=self.manager.cluster)
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mdss = self.ctx.daemons.iter_daemons_of_role('mds', cluster=self.manager.cluster)
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clients = self.ctx.daemons.iter_daemons_of_role('client', cluster=self.manager.cluster)
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#for daemon in mons:
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# self.log("mon daemon {role}.{id}: running={r}".format(role=daemon.role, id=daemon.id_, r=daemon.running() and not daemon.proc.finished))
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#for daemon in mdss:
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# self.log("mds daemon {role}.{id}: running={r}".format(role=daemon.role, id=daemon.id_, r=daemon.running() and not daemon.proc.finished))
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daemon_failures = []
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daemon_failures.extend(filter(lambda daemon: daemon.running() and daemon.proc.finished, mons))
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daemon_failures.extend(filter(lambda daemon: daemon.running() and daemon.proc.finished, mdss))
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for daemon in daemon_failures:
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name = daemon.role + '.' + daemon.id_
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dt = daemon_failure_time.setdefault(name, (daemon, now))
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assert dt[0] is daemon
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delta = now-dt[1]
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self.log("daemon {name} is failed for ~{t:.0f}s".format(name=name, t=delta))
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if delta > daemon_timeout:
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bark = True
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# If a daemon is no longer failed, remove it from tracking:
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for name in daemon_failure_time.keys():
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if name not in [d.role + '.' + d.id_ for d in daemon_failures]:
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self.log("daemon {name} has been restored".format(name=name))
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del daemon_failure_time[name]
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for thrasher in self.thrashers:
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if thrasher.e is not None:
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self.log("thrasher on fs.{name} failed".format(name=thrasher.fs.name))
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bark = True
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if bark:
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self.bark()
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return
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sleep(5)
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self.log("watchdog finished")
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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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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]. When reduced, randomly selected MDSs other than rank 0 will be
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deactivated to reach the new 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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Greenlet.__init__(self)
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self.config = config
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self.ctx = ctx
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self.e = None
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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.stopping = Event()
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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 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.e = 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 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 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.iterkeys())
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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, standby_for_rank=None):
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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 (using --hot-standby if specified.
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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.iterkeys())
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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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if standby_for_rank:
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args.extend(['--hot-standby', standby_for_rank])
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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 = filter(lambda info: "up:stopping" == info['state'], ranks)
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actives = filter(lambda info: "up:active" == info['state'] and "laggy_since" not in info, ranks)
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if not bool(self.config.get('thrash_while_stopping', False)) and len(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 len(actives) >= max_mds:
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# no replacement can occur!
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self.log("cluster has %d actives (max_mds is %d), no MDS can replace rank %d".format(len(actives), max_mds, rank))
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return status
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else:
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if len(actives) >= max_mds:
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self.log('mds cluster has {count} alive and active, now stable!'.format(count = len(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.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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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 = range(1, max_mds)+range(max_mds+1, self.max_mds+1)
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if len(options) > 0:
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sample = random.sample(options, 1)
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new_max_mds = sample[0]
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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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targets = filter(lambda r: r['rank'] >= new_max_mds, status.get_ranks(self.fs.id))
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if len(targets) > 0:
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# deactivate mds in decending order
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targets = sorted(targets, key=lambda r: r['rank'], reverse=True)
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for target in targets:
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self.log("deactivating rank %d" % target['rank'])
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self.fs.deactivate(target['rank'])
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stats['deactivate'] += 1
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status = self.wait_for_stable()[0]
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else:
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status = self.wait_for_stable()[0]
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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.randrange(0.0, 1.0)
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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, since=last_laggy_since))
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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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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.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...')
|
|
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')
|
|
|
|
thrashers = []
|
|
|
|
watchdog = DaemonWatchdog(ctx, manager, config, thrashers)
|
|
watchdog.start()
|
|
|
|
manager.wait_for_clean()
|
|
assert manager.is_clean()
|
|
for fs in status.get_filesystems():
|
|
thrasher = MDSThrasher(ctx, manager, config, Filesystem(ctx, fs['id']), fs['mdsmap']['max_mds'])
|
|
thrasher.start()
|
|
thrashers.append(thrasher)
|
|
|
|
try:
|
|
log.debug('Yielding')
|
|
yield
|
|
finally:
|
|
log.info('joining mds_thrashers')
|
|
for thrasher in thrashers:
|
|
thrasher.stop()
|
|
if thrasher.e:
|
|
raise RuntimeError('error during thrashing')
|
|
thrasher.join()
|
|
log.info('done joining')
|
|
|
|
watchdog.stop()
|
|
watchdog.join()
|