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"""
Task for thrashing cephfs-mirror daemons
"""
import contextlib
import logging
import random
import signal
import socket
import time
from gevent import sleep
from gevent.greenlet import Greenlet
from gevent.event import Event
from teuthology.exceptions import CommandFailedError
from teuthology.orchestra import run
from tasks.thrasher import Thrasher
log = logging.getLogger(__name__)
class CephFSMirrorThrasher(Thrasher, Greenlet):
"""
CephFSMirrorThrasher::
The CephFSMirrorThrasher thrashes cephfs-mirror daemons during execution of other
tasks (workunits, etc).
The config is optional. Many of the config parameters are a maximum value
to use when selecting a random value from a range. The config is a dict
containing some or all of:
cluster: [default: ceph] cluster to thrash
max_thrash: [default: 1] the maximum number of active cephfs-mirror daemons per
cluster will be thrashed at any given time.
min_thrash_delay: [default: 60] minimum number of seconds to delay before
thrashing again.
max_thrash_delay: [default: 120] maximum number of seconds to delay before
thrashing again.
max_revive_delay: [default: 10] maximum number of seconds to delay before
bringing back a thrashed cephfs-mirror daemon.
randomize: [default: true] enables randomization and use the max/min values
seed: [no default] seed the random number generator
Examples::
The following example disables randomization, and uses the max delay
values:
tasks:
- ceph:
- cephfs_mirror_thrash:
randomize: False
max_thrash_delay: 10
"""
def __init__(self, ctx, config, cluster, daemons):
super(CephFSMirrorThrasher, self).__init__()
self.ctx = ctx
self.config = config
self.cluster = cluster
self.daemons = daemons
self.logger = log
self.name = 'thrasher.cephfs_mirror.[{cluster}]'.format(cluster = cluster)
self.stopping = Event()
self.randomize = bool(self.config.get('randomize', True))
self.max_thrash = int(self.config.get('max_thrash', 1))
self.min_thrash_delay = float(self.config.get('min_thrash_delay', 5.0))
self.max_thrash_delay = float(self.config.get('max_thrash_delay', 10))
self.max_revive_delay = float(self.config.get('max_revive_delay', 15.0))
def _run(self):
try:
self.do_thrash()
except Exception as e:
# See _run exception comment for MDSThrasher
self.set_thrasher_exception(e)
self.logger.exception("exception:")
# Allow successful completion so gevent doesn't see an exception.
# The DaemonWatchdog will observe the error and tear down the test.
def log(self, x):
"""Write data to logger assigned to this CephFSMirrorThrasher"""
self.logger.info(x)
def stop(self):
self.stopping.set()
def do_thrash(self):
"""
Perform the random thrashing action
"""
self.log('starting thrash for cluster {cluster}'.format(cluster=self.cluster))
stats = {
"kill": 0,
}
while not self.stopping.is_set():
delay = self.max_thrash_delay
if self.randomize:
delay = random.randrange(self.min_thrash_delay, self.max_thrash_delay)
if delay > 0.0:
self.log('waiting for {delay} secs before thrashing'.format(delay=delay))
self.stopping.wait(delay)
if self.stopping.is_set():
continue
killed_daemons = []
weight = 1.0 / len(self.daemons)
count = 0
for daemon in self.daemons:
skip = random.uniform(0.0, 1.0)
if weight <= skip:
self.log('skipping daemon {label} with skip ({skip}) > weight ({weight})'.format(
label=daemon.id_, skip=skip, weight=weight))
continue
self.log('kill {label}'.format(label=daemon.id_))
try:
daemon.signal(signal.SIGTERM)
except Exception as e:
self.log(f'exception when stopping mirror daemon: {e}')
else:
killed_daemons.append(daemon)
stats['kill'] += 1
# if we've reached max_thrash, we're done
count += 1
if count >= self.max_thrash:
break
if killed_daemons:
# wait for a while before restarting
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 daemons'.format(delay=delay))
sleep(delay)
for daemon in killed_daemons:
self.log('waiting for {label}'.format(label=daemon.id_))
try:
run.wait([daemon.proc], timeout=600)
except CommandFailedError:
pass
except:
self.log('Failed to stop {label}'.format(label=daemon.id_))
try:
# try to capture a core dump
daemon.signal(signal.SIGABRT)
except socket.error:
pass
raise
finally:
daemon.reset()
for daemon in killed_daemons:
self.log('reviving {label}'.format(label=daemon.id_))
daemon.start()
for stat in stats:
self.log("stat['{key}'] = {value}".format(key = stat, value = stats[stat]))
@contextlib.contextmanager
def task(ctx, config):
"""
Stress test the cephfs-mirror by thrashing while another task/workunit
is running.
Please refer to CephFSMirrorThrasher class for further information on the
available options.
"""
if config is None:
config = {}
assert isinstance(config, dict), \
'cephfs_mirror_thrash task only accepts a dict for configuration'
cluster = config.get('cluster', 'ceph')
daemons = list(ctx.daemons.iter_daemons_of_role('cephfs-mirror', cluster))
assert len(daemons) > 0, \
'cephfs_mirror_thrash task requires at least 1 cephfs-mirror daemon'
# choose random seed
if 'seed' in config:
seed = int(config['seed'])
else:
seed = int(time.time())
log.info('cephfs_mirror_thrash using random seed: {seed}'.format(seed=seed))
random.seed(seed)
thrasher = CephFSMirrorThrasher(ctx, config, cluster, daemons)
thrasher.start()
ctx.ceph[cluster].thrashers.append(thrasher)
try:
log.debug('Yielding')
yield
finally:
log.info('joining cephfs_mirror_thrash')
thrasher.stop()
if thrasher.exception is not None:
raise RuntimeError('error during thrashing')
thrasher.join()
log.info('done joining')
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