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"""
Thrash mds by simulating failures
"""
import logging
import contextlib
from gevent import sleep, GreenletExit
from gevent.greenlet import Greenlet
from gevent.event import Event
from teuthology import misc as teuthology
from tasks import ceph_manager
from tasks.cephfs.filesystem import MDSCluster, Filesystem
from tasks.thrasher import Thrasher
log = logging.getLogger(__name__)
class ForwardScrubber(Thrasher, Greenlet):
"""
ForwardScrubber::
The ForwardScrubber does forward scrubbing of file-systems during execution
of other tasks (workunits, etc).
"""
def __init__(self, fs, scrub_timeout=300, sleep_between_iterations=1):
super(ForwardScrubber, self).__init__()
self.logger = log.getChild('fs.[{f}]'.format(f=fs.name))
self.fs = fs
self.name = 'thrasher.fs.[{f}]'.format(f=fs.name)
self.stopping = Event()
self.scrub_timeout = scrub_timeout
self.sleep_between_iterations = sleep_between_iterations
def _run(self):
try:
self.do_scrub()
except Exception as e:
self.set_thrasher_exception(e)
self.logger.exception("exception:")
# allow successful completion so gevent doesn't see an exception...
def stop(self):
self.stopping.set()
def do_scrub(self):
"""
Perform the file-system scrubbing
"""
self.logger.info(f'start scrubbing fs: {self.fs.name}')
try:
while not self.stopping.is_set():
self._scrub()
sleep(self.sleep_between_iterations)
except GreenletExit:
pass
self.logger.info(f'end scrubbing fs: {self.fs.name}')
def _scrub(self, path="/", recursive=True):
self.logger.info(f"scrubbing fs: {self.fs.name}")
scrubopts = ["force"]
if recursive:
scrubopts.append("recursive")
out_json = self.fs.run_scrub(["start", path, ",".join(scrubopts)])
assert out_json is not None
tag = out_json['scrub_tag']
assert tag is not None
assert out_json['return_code'] == 0
assert out_json['mode'] == 'asynchronous'
return self.fs.wait_until_scrub_complete(tag=tag, sleep=30,
timeout=self.scrub_timeout)
def stop_all_fwd_scrubbers(thrashers):
for thrasher in thrashers:
if not isinstance(thrasher, ForwardScrubber):
continue
thrasher.stop()
thrasher.join()
if thrasher.exception is not None:
raise RuntimeError(f"error during scrub thrashing: {thrasher.exception}")
@contextlib.contextmanager
def task(ctx, config):
"""
Stress test the mds by running scrub iterations while another task/workunit
is running.
Example config:
- fwd_scrub:
scrub_timeout: 300
sleep_between_iterations: 1
"""
mds_cluster = MDSCluster(ctx)
if config is None:
config = {}
assert isinstance(config, dict), \
'fwd_scrub task only accepts a dict for configuration'
mdslist = list(teuthology.all_roles_of_type(ctx.cluster, 'mds'))
assert len(mdslist) > 0, \
'fwd_scrub task requires at least 1 metadata server'
(first,) = ctx.cluster.only(f'mds.{mdslist[0]}').remotes.keys()
manager = ceph_manager.CephManager(
first, ctx=ctx, logger=log.getChild('ceph_manager'),
)
# make sure everyone is in active, standby, or standby-replay
log.info('Wait for all MDSs to reach steady state...')
status = mds_cluster.status()
while True:
steady = True
for info in status.get_all():
state = info['state']
if state not in ('up:active', 'up:standby', 'up:standby-replay'):
steady = False
break
if steady:
break
sleep(2)
status = mds_cluster.status()
log.info('Ready to start scrub thrashing')
manager.wait_for_clean()
assert manager.is_clean()
if 'cluster' not in config:
config['cluster'] = 'ceph'
for fs in status.get_filesystems():
fwd_scrubber = ForwardScrubber(Filesystem(ctx, fscid=fs['id']),
config['scrub_timeout'],
config['sleep_between_iterations'])
fwd_scrubber.start()
ctx.ceph[config['cluster']].thrashers.append(fwd_scrubber)
try:
log.debug('Yielding')
yield
finally:
log.info('joining ForwardScrubbers')
stop_all_fwd_scrubbers(ctx.ceph[config['cluster']].thrashers)
log.info('done joining')
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