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import logging
import contextlib
import time
import ceph_manager
from teuthology import misc
from teuthology.orchestra.run import CommandFailedError, Raw
log = logging.getLogger(__name__)
@contextlib.contextmanager
def task(ctx, config):
"""
Go through filesystem creation with a synthetic failure in an MDS
in its 'up:creating' state, to exercise the retry behaviour.
"""
# Grab handles to the teuthology objects of interest
mdslist = list(misc.all_roles_of_type(ctx.cluster, 'mds'))
if len(mdslist) != 1:
# Require exactly one MDS, the code path for creation failure when
# a standby is available is different
raise RuntimeError("This task requires exactly one MDS")
mds_id = mdslist[0]
(mds_remote,) = ctx.cluster.only('mds.{_id}'.format(_id=mds_id)).remotes.iterkeys()
manager = ceph_manager.CephManager(
mds_remote, ctx=ctx, logger=log.getChild('ceph_manager'),
)
# Stop MDS
manager.raw_cluster_cmd('mds', 'set', "max_mds", "0")
mds = ctx.daemons.get_daemon('mds', mds_id)
mds.stop()
manager.raw_cluster_cmd('mds', 'fail', mds_id)
# Reset the filesystem so that next start will go into CREATING
manager.raw_cluster_cmd('fs', 'rm', "default", "--yes-i-really-mean-it")
manager.raw_cluster_cmd('fs', 'new', "default", "metadata", "data")
# Start the MDS with mds_kill_create_at set, it will crash during creation
mds.restart_with_args(["--mds_kill_create_at=1"])
try:
mds.wait_for_exit()
except CommandFailedError as e:
if e.exitstatus == 1:
log.info("MDS creation killed as expected")
else:
log.error("Unexpected status code %s" % e.exitstatus)
raise
# Since I have intentionally caused a crash, I will clean up the resulting core
# file to avoid task.internal.coredump seeing it as a failure.
log.info("Removing core file from synthetic MDS failure")
mds_remote.run(args=['rm', '-f', Raw("{archive}/coredump/*.core".format(archive=misc.get_archive_dir(ctx)))])
# It should have left the MDS map state still in CREATING
status = manager.get_mds_status(mds_id)
assert status['state'] == 'up:creating'
# Start the MDS again without the kill flag set, it should proceed with creation successfully
mds.restart()
# Wait for state ACTIVE
t = 0
create_timeout = 120
while True:
status = manager.get_mds_status(mds_id)
if status['state'] == 'up:active':
log.info("MDS creation completed successfully")
break
elif status['state'] == 'up:creating':
log.info("MDS still in creating state")
if t > create_timeout:
log.error("Creating did not complete within %ss" % create_timeout)
raise RuntimeError("Creating did not complete within %ss" % create_timeout)
t += 1
time.sleep(1)
else:
log.error("Unexpected MDS state: %s" % status['state'])
assert(status['state'] in ['up:active', 'up:creating'])
# The system should be back up in a happy healthy state, go ahead and run any further tasks
# inside this context.
yield
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