import time
import signal
import json
import logging
from unittest import case, SkipTest
from random import randint
from cephfs_test_case import CephFSTestCase
from teuthology.exceptions import CommandFailedError
from teuthology import misc as teuthology
from tasks.cephfs.fuse_mount import FuseMount
log = logging.getLogger(__name__)
class TestClusterResize(CephFSTestCase):
CLIENTS_REQUIRED = 1
MDSS_REQUIRED = 3
def grow(self, n):
grace = float(self.fs.get_config("mds_beacon_grace", service_type="mon"))
fscid = self.fs.id
status = self.fs.status()
log.info("status = {0}".format(status))
original_ranks = set([info['gid'] for info in status.get_ranks(fscid)])
original_standbys = set([info['gid'] for info in status.get_standbys()])
oldmax = self.fs.get_var('max_mds')
self.assertTrue(n > oldmax)
self.fs.set_max_mds(n)
log.info("Waiting for cluster to grow.")
status = self.fs.wait_for_daemons(timeout=60+grace*2)
ranks = set([info['gid'] for info in status.get_ranks(fscid)])
self.assertTrue(original_ranks.issubset(ranks) and len(ranks) == n)
return status
def shrink(self, n):
grace = float(self.fs.get_config("mds_beacon_grace", service_type="mon"))
fscid = self.fs.id
status = self.fs.status()
log.info("status = {0}".format(status))
original_ranks = set([info['gid'] for info in status.get_ranks(fscid)])
original_standbys = set([info['gid'] for info in status.get_standbys()])
oldmax = self.fs.get_var('max_mds')
self.assertTrue(n < oldmax)
self.fs.set_max_mds(n)
# Wait until the monitor finishes stopping ranks >= n
log.info("Waiting for cluster to shink.")
status = self.fs.wait_for_daemons(timeout=60+grace*2)
ranks = set([info['gid'] for info in status.get_ranks(fscid)])
self.assertTrue(ranks.issubset(original_ranks) and len(ranks) == n)
return status
def test_grow(self):
"""
That the MDS cluster grows after increasing max_mds.
"""
# Need all my standbys up as well as the active daemons
# self.wait_for_daemon_start() necessary?
self.grow(2)
self.grow(3)
def test_shrink(self):
"""
That the MDS cluster shrinks automatically after decreasing max_mds.
"""
self.grow(3)
self.shrink(1)
def test_up_less_than_max(self):
"""
That a health warning is generated when max_mds is greater than active count.
"""
status = self.fs.status()
mdss = [info['gid'] for info in status.get_all()]
self.fs.set_max_mds(len(mdss)+1)
self.wait_for_health("MDS_UP_LESS_THAN_MAX", 30)
self.shrink(2)
self.wait_for_health_clear(30)
def test_down_health(self):
"""
That marking a FS down does not generate a health warning
"""
self.fs.set_down()
try:
self.wait_for_health("", 30)
raise RuntimeError("got health warning?")
except RuntimeError as e:
if "Timed out after" in str(e):
pass
else:
raise
def test_down_twice(self):
"""
That marking a FS down twice does not wipe old_max_mds.
"""
self.grow(2)
self.fs.set_down()
self.fs.wait_for_daemons()
self.fs.set_down(False)
self.assertEqual(self.fs.get_var("max_mds"), 2)
self.fs.wait_for_daemons(timeout=60)
def test_down_grow(self):
"""
That setting max_mds undoes down.
"""
self.fs.set_down()
self.fs.wait_for_daemons()
self.grow(2)
self.fs.wait_for_daemons()
def test_down(self):
"""
That down setting toggles and sets max_mds appropriately.
"""
self.fs.set_down()
self.fs.wait_for_daemons()
self.assertEqual(self.fs.get_var("max_mds"), 0)
self.fs.set_down(False)
self.assertEqual(self.fs.get_var("max_mds"), 1)
self.fs.wait_for_daemons()
self.assertEqual(self.fs.get_var("max_mds"), 1)
def test_hole(self):
"""
Test that a hole cannot be created in the FS ranks.
"""
fscid = self.fs.id
self.grow(2)
self.fs.set_max_mds(1)
log.info("status = {0}".format(self.fs.status()))
self.fs.set_max_mds(3)
# Don't wait for rank 1 to stop
self.fs.set_max_mds(2)
# Prevent another MDS from taking rank 1
# XXX This is a little racy because rank 1 may have stopped and a
# standby assigned to rank 1 before joinable=0 is set.
self.fs.set_joinable(False) # XXX keep in mind changing max_mds clears this flag
try:
status = self.fs.wait_for_daemons(timeout=90)
raise RuntimeError("should not be able to successfully shrink cluster!")
except:
# could not shrink to max_mds=2 and reach 2 actives (because joinable=False)
status = self.fs.status()
ranks = set([info['rank'] for info in status.get_ranks(fscid)])
self.assertTrue(ranks == set([0]))
finally:
log.info("status = {0}".format(status))
def test_thrash(self):
"""
Test that thrashing max_mds does not fail.
"""
max_mds = 2
for i in range(0, 100):
self.fs.set_max_mds(max_mds)
max_mds = (max_mds+1)%3+1
self.fs.wait_for_daemons(timeout=90)
class TestFailover(CephFSTestCase):
CLIENTS_REQUIRED = 1
MDSS_REQUIRED = 2
def test_simple(self):
"""
That when the active MDS is killed, a standby MDS is promoted into
its rank after the grace period.
This is just a simple unit test, the harder cases are covered
in thrashing tests.
"""
# Need all my standbys up as well as the active daemons
self.wait_for_daemon_start()
(original_active, ) = self.fs.get_active_names()
original_standbys = self.mds_cluster.get_standby_daemons()
# Kill the rank 0 daemon's physical process
self.fs.mds_stop(original_active)
grace = float(self.fs.get_config("mds_beacon_grace", service_type="mon"))
# Wait until the monitor promotes his replacement
def promoted():
active = self.fs.get_active_names()
return active and active[0] in original_standbys
log.info("Waiting for promotion of one of the original standbys {0}".format(
original_standbys))
self.wait_until_true(
promoted,
timeout=grace*2)
# Start the original rank 0 daemon up again, see that he becomes a standby
self.fs.mds_restart(original_active)
self.wait_until_true(
lambda: original_active in self.mds_cluster.get_standby_daemons(),
timeout=60 # Approximately long enough for MDS to start and mon to notice
)
def test_client_abort(self):
"""
That a client will respect fuse_require_active_mds and error out
when the cluster appears to be unavailable.
"""
if not isinstance(self.mount_a, FuseMount):
raise SkipTest("Requires FUSE client to inject client metadata")
require_active = self.fs.get_config("fuse_require_active_mds", service_type="mon").lower() == "true"
if not require_active:
raise case.SkipTest("fuse_require_active_mds is not set")
grace = float(self.fs.get_config("mds_beacon_grace", service_type="mon"))
# Check it's not laggy to begin with
(original_active, ) = self.fs.get_active_names()
self.assertNotIn("laggy_since", self.fs.status().get_mds(original_active))
self.mounts[0].umount_wait()
# Control: that we can mount and unmount usually, while the cluster is healthy
self.mounts[0].mount()
self.mounts[0].wait_until_mounted()
self.mounts[0].umount_wait()
# Stop the daemon processes
self.fs.mds_stop()
# Wait for everyone to go laggy
def laggy():
mdsmap = self.fs.get_mds_map()
for info in mdsmap['info'].values():
if "laggy_since" not in info:
return False
return True
self.wait_until_true(laggy, grace * 2)
with self.assertRaises(CommandFailedError):
self.mounts[0].mount()
def test_standby_count_wanted(self):
"""
That cluster health warnings are generated by insufficient standbys available.
"""
# Need all my standbys up as well as the active daemons
self.wait_for_daemon_start()
grace = float(self.fs.get_config("mds_beacon_grace", service_type="mon"))
standbys = self.mds_cluster.get_standby_daemons()
self.assertGreaterEqual(len(standbys), 1)
self.fs.mon_manager.raw_cluster_cmd('fs', 'set', self.fs.name, 'standby_count_wanted', str(len(standbys)))
# Kill a standby and check for warning
victim = standbys.pop()
self.fs.mds_stop(victim)
log.info("waiting for insufficient standby daemon warning")
self.wait_for_health("MDS_INSUFFICIENT_STANDBY", grace*2)
# restart the standby, see that he becomes a standby, check health clears
self.fs.mds_restart(victim)
self.wait_until_true(
lambda: victim in self.mds_cluster.get_standby_daemons(),
timeout=60 # Approximately long enough for MDS to start and mon to notice
)
self.wait_for_health_clear(timeout=30)
# Set it one greater than standbys ever seen
standbys = self.mds_cluster.get_standby_daemons()
self.assertGreaterEqual(len(standbys), 1)
self.fs.mon_manager.raw_cluster_cmd('fs', 'set', self.fs.name, 'standby_count_wanted', str(len(standbys)+1))
log.info("waiting for insufficient standby daemon warning")
self.wait_for_health("MDS_INSUFFICIENT_STANDBY", grace*2)
# Set it to 0
self.fs.mon_manager.raw_cluster_cmd('fs', 'set', self.fs.name, 'standby_count_wanted', '0')
self.wait_for_health_clear(timeout=30)
def test_discontinuous_mdsmap(self):
"""
That discontinuous mdsmap does not affect failover.
See http://tracker.ceph.com/issues/24856.
"""
self.fs.set_max_mds(2)
status = self.fs.wait_for_daemons()
self.mount_a.umount_wait()
grace = float(self.fs.get_config("mds_beacon_grace", service_type="mon"))
monc_timeout = float(self.fs.get_config("mon_client_ping_timeout", service_type="mds"))
mds_0 = self.fs.get_rank(rank=0, status=status)
self.fs.rank_freeze(True, rank=0) # prevent failover
self.fs.rank_signal(signal.SIGSTOP, rank=0, status=status)
self.wait_until_true(
lambda: "laggy_since" in self.fs.get_rank(),
timeout=grace * 2
)
self.fs.rank_fail(rank=1)
self.fs.wait_for_state('up:resolve', rank=1, timeout=30)
# Make sure of mds_0's monitor connection gets reset
time.sleep(monc_timeout * 2)
# Continue rank 0, it will get discontinuous mdsmap
self.fs.rank_signal(signal.SIGCONT, rank=0)
self.wait_until_true(
lambda: "laggy_since" not in self.fs.get_rank(rank=0),
timeout=grace * 2
)
# mds.b will be stuck at 'reconnect' state if snapserver gets confused
# by discontinuous mdsmap
self.fs.wait_for_state('up:active', rank=1, timeout=30)
self.assertEqual(mds_0['gid'], self.fs.get_rank(rank=0)['gid'])
self.fs.rank_freeze(False, rank=0)
class TestStandbyReplay(CephFSTestCase):
MDSS_REQUIRED = 4
def _confirm_no_replay(self):
status = self.fs.status()
standby_count = len(list(status.get_standbys()))
self.assertEqual(0, len(list(self.fs.get_replays(status=status))))
return status
def _confirm_single_replay(self, full=True, status=None):
status = self.fs.wait_for_daemons(status=status)
ranks = sorted(self.fs.get_mds_map(status=status)['in'])
replays = list(self.fs.get_replays(status=status))
checked_replays = set()
for rank in ranks:
has_replay = False
for replay in replays:
if replay['rank'] == rank:
self.assertFalse(has_replay)
has_replay = True
checked_replays.add(replay['gid'])
if full and not has_replay:
raise RuntimeError("rank "+str(rank)+" has no standby-replay follower")
self.assertEqual(checked_replays, set(info['gid'] for info in replays))
return status
def _check_replay_takeover(self, status, rank=0):
replay = self.fs.get_replay(rank=rank, status=status)
new_status = self.fs.wait_for_daemons()
new_active = self.fs.get_rank(rank=rank, status=new_status)
if replay:
self.assertEqual(replay['gid'], new_active['gid'])
else:
# double check takeover came from a standby (or some new daemon via restart)
found = False
for info in status.get_standbys():
if info['gid'] == new_active['gid']:
found = True
break
if not found:
for info in status.get_all():
self.assertNotEqual(info['gid'], new_active['gid'])
return new_status
def test_standby_replay_singleton(self):
"""
That only one MDS becomes standby-replay.
"""
self._confirm_no_replay()
self.fs.set_allow_standby_replay(True)
time.sleep(30)
self._confirm_single_replay()
def test_standby_replay_singleton_fail(self):
"""
That failures don't violate singleton constraint.
"""
self._confirm_no_replay()
self.fs.set_allow_standby_replay(True)
status = self._confirm_single_replay()
for i in range(10):
time.sleep(randint(1, 5))
self.fs.rank_restart(status=status)
status = self._check_replay_takeover(status)
status = self._confirm_single_replay(status=status)
for i in range(10):
time.sleep(randint(1, 5))
self.fs.rank_fail()
status = self._check_replay_takeover(status)
status = self._confirm_single_replay(status=status)
def test_standby_replay_singleton_fail_multimds(self):
"""
That failures don't violate singleton constraint with multiple actives.
"""
status = self._confirm_no_replay()
new_max_mds = randint(2, len(list(status.get_standbys())))
self.fs.set_max_mds(new_max_mds)
self.fs.wait_for_daemons() # wait for actives to come online!
self.fs.set_allow_standby_replay(True)
status = self._confirm_single_replay(full=False)
for i in range(10):
time.sleep(randint(1, 5))
victim = randint(0, new_max_mds-1)
self.fs.rank_restart(rank=victim, status=status)
status = self._check_replay_takeover(status, rank=victim)
status = self._confirm_single_replay(status=status, full=False)
for i in range(10):
time.sleep(randint(1, 5))
victim = randint(0, new_max_mds-1)
self.fs.rank_fail(rank=victim)
status = self._check_replay_takeover(status, rank=victim)
status = self._confirm_single_replay(status=status, full=False)
def test_standby_replay_failure(self):
"""
That the failure of a standby-replay daemon happens cleanly
and doesn't interrupt anything else.
"""
status = self._confirm_no_replay()
self.fs.set_max_mds(1)
self.fs.set_allow_standby_replay(True)
status = self._confirm_single_replay()
for i in range(10):
time.sleep(randint(1, 5))
victim = self.fs.get_replay(status=status)
self.fs.mds_restart(mds_id=victim['name'])
status = self._confirm_single_replay(status=status)
def test_rank_stopped(self):
"""
That when a rank is STOPPED, standby replays for
that rank get torn down
"""
status = self._confirm_no_replay()
standby_count = len(list(status.get_standbys()))
self.fs.set_max_mds(2)
self.fs.set_allow_standby_replay(True)
status = self._confirm_single_replay()
self.fs.set_max_mds(1) # stop rank 1
status = self._confirm_single_replay()
self.assertTrue(standby_count, len(list(status.get_standbys())))
class TestMultiFilesystems(CephFSTestCase):
CLIENTS_REQUIRED = 2
MDSS_REQUIRED = 4
# We'll create our own filesystems and start our own daemons
REQUIRE_FILESYSTEM = False
def setUp(self):
super(TestMultiFilesystems, self).setUp()
self.mds_cluster.mon_manager.raw_cluster_cmd("fs", "flag", "set",
"enable_multiple", "true",
"--yes-i-really-mean-it")
def _setup_two(self):
fs_a = self.mds_cluster.newfs("alpha")
fs_b = self.mds_cluster.newfs("bravo")
self.mds_cluster.mds_restart()
# Wait for both filesystems to go healthy
fs_a.wait_for_daemons()
fs_b.wait_for_daemons()
# Reconfigure client auth caps
for mount in self.mounts:
self.mds_cluster.mon_manager.raw_cluster_cmd_result(
'auth', 'caps', "client.{0}".format(mount.client_id),
'mds', 'allow',
'mon', 'allow r',
'osd', 'allow rw pool={0}, allow rw pool={1}'.format(
fs_a.get_data_pool_name(), fs_b.get_data_pool_name()))
return fs_a, fs_b
def test_clients(self):
fs_a, fs_b = self._setup_two()
# Mount a client on fs_a
self.mount_a.mount(mount_fs_name=fs_a.name)
self.mount_a.write_n_mb("pad.bin", 1)
self.mount_a.write_n_mb("test.bin", 2)
a_created_ino = self.mount_a.path_to_ino("test.bin")
self.mount_a.create_files()
# Mount a client on fs_b
self.mount_b.mount(mount_fs_name=fs_b.name)
self.mount_b.write_n_mb("test.bin", 1)
b_created_ino = self.mount_b.path_to_ino("test.bin")
self.mount_b.create_files()
# Check that a non-default filesystem mount survives an MDS
# failover (i.e. that map subscription is continuous, not
# just the first time), reproduces #16022
old_fs_b_mds = fs_b.get_active_names()[0]
self.mds_cluster.mds_stop(old_fs_b_mds)
self.mds_cluster.mds_fail(old_fs_b_mds)
fs_b.wait_for_daemons()
background = self.mount_b.write_background()
# Raise exception if the write doesn't finish (i.e. if client
# has not kept up with MDS failure)
try:
self.wait_until_true(lambda: background.finished, timeout=30)
except RuntimeError:
# The mount is stuck, we'll have to force it to fail cleanly
background.stdin.close()
self.mount_b.umount_wait(force=True)
raise
self.mount_a.umount_wait()
self.mount_b.umount_wait()
# See that the client's files went into the correct pool
self.assertTrue(fs_a.data_objects_present(a_created_ino, 1024 * 1024))
self.assertTrue(fs_b.data_objects_present(b_created_ino, 1024 * 1024))
def test_standby(self):
fs_a, fs_b = self._setup_two()
# Assert that the remaining two MDS daemons are now standbys
a_daemons = fs_a.get_active_names()
b_daemons = fs_b.get_active_names()
self.assertEqual(len(a_daemons), 1)
self.assertEqual(len(b_daemons), 1)
original_a = a_daemons[0]
original_b = b_daemons[0]
expect_standby_daemons = set(self.mds_cluster.mds_ids) - (set(a_daemons) | set(b_daemons))
# Need all my standbys up as well as the active daemons
self.wait_for_daemon_start()
self.assertEqual(expect_standby_daemons, self.mds_cluster.get_standby_daemons())
# Kill fs_a's active MDS, see a standby take over
self.mds_cluster.mds_stop(original_a)
self.mds_cluster.mon_manager.raw_cluster_cmd("mds", "fail", original_a)
self.wait_until_equal(lambda: len(fs_a.get_active_names()), 1, 30,
reject_fn=lambda v: v > 1)
# Assert that it's a *different* daemon that has now appeared in the map for fs_a
self.assertNotEqual(fs_a.get_active_names()[0], original_a)
# Kill fs_b's active MDS, see a standby take over
self.mds_cluster.mds_stop(original_b)
self.mds_cluster.mon_manager.raw_cluster_cmd("mds", "fail", original_b)
self.wait_until_equal(lambda: len(fs_b.get_active_names()), 1, 30,
reject_fn=lambda v: v > 1)
# Assert that it's a *different* daemon that has now appeared in the map for fs_a
self.assertNotEqual(fs_b.get_active_names()[0], original_b)
# Both of the original active daemons should be gone, and all standbys used up
self.assertEqual(self.mds_cluster.get_standby_daemons(), set())
# Restart the ones I killed, see them reappear as standbys
self.mds_cluster.mds_restart(original_a)
self.mds_cluster.mds_restart(original_b)
self.wait_until_true(
lambda: {original_a, original_b} == self.mds_cluster.get_standby_daemons(),
timeout=30
)
def test_grow_shrink(self):
# Usual setup...
fs_a, fs_b = self._setup_two()
# Increase max_mds on fs_b, see a standby take up the role
fs_b.set_max_mds(2)
self.wait_until_equal(lambda: len(fs_b.get_active_names()), 2, 30,
reject_fn=lambda v: v > 2 or v < 1)
# Increase max_mds on fs_a, see a standby take up the role
fs_a.set_max_mds(2)
self.wait_until_equal(lambda: len(fs_a.get_active_names()), 2, 30,
reject_fn=lambda v: v > 2 or v < 1)
# Shrink fs_b back to 1, see a daemon go back to standby
fs_b.set_max_mds(1)
self.wait_until_equal(lambda: len(fs_b.get_active_names()), 1, 30,
reject_fn=lambda v: v > 2 or v < 1)
# Grow fs_a up to 3, see the former fs_b daemon join it.
fs_a.set_max_mds(3)
self.wait_until_equal(lambda: len(fs_a.get_active_names()), 3, 60,
reject_fn=lambda v: v > 3 or v < 2)