import json import logging from unittest import case, SkipTest 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 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(): for info in self.fs.status().get_cluster(self.fs.id): 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) class TestStandbyReplay(CephFSTestCase): MDSS_REQUIRED = 4 REQUIRE_FILESYSTEM = False def set_standby_for(self, leader, follower, replay): self.set_conf("mds.{0}".format(follower), "mds_standby_for_name", leader) if replay: self.set_conf("mds.{0}".format(follower), "mds_standby_replay", "true") def get_info_by_name(self, mds_name): status = self.mds_cluster.status() info = status.get_mds(mds_name) if info is None: log.warn(str(status)) raise RuntimeError("MDS '{0}' not found".format(mds_name)) else: return info def test_standby_replay_unused(self): # Pick out exactly 3 daemons to be run during test use_daemons = sorted(self.mds_cluster.mds_ids[0:3]) mds_a, mds_b, mds_c = use_daemons log.info("Using MDS daemons: {0}".format(use_daemons)) # B and C should both follow A, but only one will # really get into standby replay state. self.set_standby_for(mds_a, mds_b, True) self.set_standby_for(mds_a, mds_c, True) # Create FS and start A fs_a = self.mds_cluster.newfs("alpha") self.mds_cluster.mds_restart(mds_a) fs_a.wait_for_daemons() self.assertEqual(fs_a.get_active_names(), [mds_a]) # Start B, he should go into standby replay self.mds_cluster.mds_restart(mds_b) self.wait_for_daemon_start([mds_b]) info_b = self.get_info_by_name(mds_b) self.assertEqual(info_b['state'], "up:standby-replay") self.assertEqual(info_b['standby_for_name'], mds_a) self.assertEqual(info_b['rank'], 0) # Start C, he should go into standby (*not* replay) self.mds_cluster.mds_restart(mds_c) self.wait_for_daemon_start([mds_c]) info_c = self.get_info_by_name(mds_c) self.assertEqual(info_c['state'], "up:standby") self.assertEqual(info_c['standby_for_name'], mds_a) self.assertEqual(info_c['rank'], -1) # Kill B, C should go into standby replay self.mds_cluster.mds_stop(mds_b) self.mds_cluster.mds_fail(mds_b) self.wait_until_equal( lambda: self.get_info_by_name(mds_c)['state'], "up:standby-replay", 60) info_c = self.get_info_by_name(mds_c) self.assertEqual(info_c['state'], "up:standby-replay") self.assertEqual(info_c['standby_for_name'], mds_a) self.assertEqual(info_c['rank'], 0) def test_standby_failure(self): """ That the failure of a standby-replay daemon happens cleanly and doesn't interrupt anything else. """ # Pick out exactly 2 daemons to be run during test use_daemons = sorted(self.mds_cluster.mds_ids[0:2]) mds_a, mds_b = use_daemons log.info("Using MDS daemons: {0}".format(use_daemons)) # Configure two pairs of MDSs that are standby for each other self.set_standby_for(mds_a, mds_b, True) self.set_standby_for(mds_b, mds_a, False) # Create FS alpha and get mds_a to come up as active fs_a = self.mds_cluster.newfs("alpha") self.mds_cluster.mds_restart(mds_a) fs_a.wait_for_daemons() self.assertEqual(fs_a.get_active_names(), [mds_a]) # Start the standbys self.mds_cluster.mds_restart(mds_b) self.wait_for_daemon_start([mds_b]) # See the standby come up as the correct rank info_b = self.get_info_by_name(mds_b) self.assertEqual(info_b['state'], "up:standby-replay") self.assertEqual(info_b['standby_for_name'], mds_a) self.assertEqual(info_b['rank'], 0) # Kill the standby self.mds_cluster.mds_stop(mds_b) self.mds_cluster.mds_fail(mds_b) # See that the standby is gone and the active remains self.assertEqual(fs_a.get_active_names(), [mds_a]) mds_map = fs_a.get_mds_map() self.assertEqual(len(mds_map['info']), 1) self.assertEqual(mds_map['failed'], []) self.assertEqual(mds_map['damaged'], []) self.assertEqual(mds_map['stopped'], []) def test_rank_stopped(self): """ That when a rank is STOPPED, standby replays for that rank get torn down """ # Pick out exactly 2 daemons to be run during test use_daemons = sorted(self.mds_cluster.mds_ids[0:4]) mds_a, mds_b, mds_a_s, mds_b_s = use_daemons log.info("Using MDS daemons: {0}".format(use_daemons)) # a and b both get a standby self.set_standby_for(mds_a, mds_a_s, True) self.set_standby_for(mds_b, mds_b_s, True) # Create FS alpha and get mds_a to come up as active fs_a = self.mds_cluster.newfs("alpha") fs_a.set_max_mds(2) self.mds_cluster.mds_restart(mds_a) self.wait_until_equal(lambda: fs_a.get_active_names(), [mds_a], 30) self.mds_cluster.mds_restart(mds_b) fs_a.wait_for_daemons() self.assertEqual(sorted(fs_a.get_active_names()), [mds_a, mds_b]) # Start the standbys self.mds_cluster.mds_restart(mds_b_s) self.wait_for_daemon_start([mds_b_s]) self.mds_cluster.mds_restart(mds_a_s) self.wait_for_daemon_start([mds_a_s]) info_b_s = self.get_info_by_name(mds_b_s) self.assertEqual(info_b_s['state'], "up:standby-replay") info_a_s = self.get_info_by_name(mds_a_s) self.assertEqual(info_a_s['state'], "up:standby-replay") # Shrink the cluster fs_a.set_max_mds(1) fs_a.mon_manager.raw_cluster_cmd("mds", "deactivate", "{0}:1".format(fs_a.name)) self.wait_until_equal( lambda: fs_a.get_active_names(), [mds_a], 60 ) # Both 'b' and 'b_s' should go back to being standbys self.wait_until_equal( lambda: self.mds_cluster.get_standby_daemons(), {mds_b, mds_b_s}, 60 ) 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) fs_b.deactivate(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) def test_standby_for_name(self): # Pick out exactly 4 daemons to be run during test use_daemons = sorted(self.mds_cluster.mds_ids[0:4]) mds_a, mds_b, mds_c, mds_d = use_daemons log.info("Using MDS daemons: {0}".format(use_daemons)) def set_standby_for(leader, follower, replay): self.set_conf("mds.{0}".format(follower), "mds_standby_for_name", leader) if replay: self.set_conf("mds.{0}".format(follower), "mds_standby_replay", "true") # Configure two pairs of MDSs that are standby for each other set_standby_for(mds_a, mds_b, True) set_standby_for(mds_b, mds_a, False) set_standby_for(mds_c, mds_d, True) set_standby_for(mds_d, mds_c, False) # Create FS alpha and get mds_a to come up as active fs_a = self.mds_cluster.newfs("alpha") self.mds_cluster.mds_restart(mds_a) fs_a.wait_for_daemons() self.assertEqual(fs_a.get_active_names(), [mds_a]) # Create FS bravo and get mds_c to come up as active fs_b = self.mds_cluster.newfs("bravo") self.mds_cluster.mds_restart(mds_c) fs_b.wait_for_daemons() self.assertEqual(fs_b.get_active_names(), [mds_c]) # Start the standbys self.mds_cluster.mds_restart(mds_b) self.mds_cluster.mds_restart(mds_d) self.wait_for_daemon_start([mds_b, mds_d]) def get_info_by_name(fs, mds_name): mds_map = fs.get_mds_map() for info in mds_map['info']: if info['name'] == mds_name: return info log.warn(json.dumps(mds_map, indent=2)) raise RuntimeError("MDS '{0}' not found in filesystem MDSMap".format(mds_name)) # See both standbys come up as standby replay for the correct ranks # mds_b should be in filesystem alpha following mds_a info_b = get_info_by_name(fs_a, mds_b) self.assertEqual(info_b['state'], "up:standby-replay") self.assertEqual(info_b['standby_for_name'], mds_a) self.assertEqual(info_b['rank'], 0) # mds_d should be in filesystem alpha following mds_c info_d = get_info_by_name(fs_b, mds_d) self.assertEqual(info_d['state'], "up:standby-replay") self.assertEqual(info_d['standby_for_name'], mds_c) self.assertEqual(info_d['rank'], 0) # Kill both active daemons self.mds_cluster.mds_stop(mds_a) self.mds_cluster.mds_fail(mds_a) self.mds_cluster.mds_stop(mds_c) self.mds_cluster.mds_fail(mds_c) # Wait for standbys to take over fs_a.wait_for_daemons() self.assertEqual(fs_a.get_active_names(), [mds_b]) fs_b.wait_for_daemons() self.assertEqual(fs_b.get_active_names(), [mds_d]) # Start the original active daemons up again self.mds_cluster.mds_restart(mds_a) self.mds_cluster.mds_restart(mds_c) self.wait_for_daemon_start([mds_a, mds_c]) self.assertEqual(set(self.mds_cluster.get_standby_daemons()), {mds_a, mds_c}) def test_standby_for_rank(self): use_daemons = sorted(self.mds_cluster.mds_ids[0:4]) mds_a, mds_b, mds_c, mds_d = use_daemons log.info("Using MDS daemons: {0}".format(use_daemons)) def set_standby_for(leader_rank, leader_fs, follower_id): self.set_conf("mds.{0}".format(follower_id), "mds_standby_for_rank", leader_rank) fscid = leader_fs.get_namespace_id() self.set_conf("mds.{0}".format(follower_id), "mds_standby_for_fscid", fscid) fs_a = self.mds_cluster.newfs("alpha") fs_b = self.mds_cluster.newfs("bravo") set_standby_for(0, fs_a, mds_a) set_standby_for(0, fs_a, mds_b) set_standby_for(0, fs_b, mds_c) set_standby_for(0, fs_b, mds_d) self.mds_cluster.mds_restart(mds_a) fs_a.wait_for_daemons() self.assertEqual(fs_a.get_active_names(), [mds_a]) self.mds_cluster.mds_restart(mds_c) fs_b.wait_for_daemons() self.assertEqual(fs_b.get_active_names(), [mds_c]) self.mds_cluster.mds_restart(mds_b) self.mds_cluster.mds_restart(mds_d) self.wait_for_daemon_start([mds_b, mds_d]) self.mds_cluster.mds_stop(mds_a) self.mds_cluster.mds_fail(mds_a) self.mds_cluster.mds_stop(mds_c) self.mds_cluster.mds_fail(mds_c) fs_a.wait_for_daemons() self.assertEqual(fs_a.get_active_names(), [mds_b]) fs_b.wait_for_daemons() self.assertEqual(fs_b.get_active_names(), [mds_d]) def test_standby_for_fscid(self): """ That I can set a standby FSCID with no rank, and the result is that daemons join any rank for that filesystem. """ use_daemons = sorted(self.mds_cluster.mds_ids[0:4]) mds_a, mds_b, mds_c, mds_d = use_daemons log.info("Using MDS daemons: {0}".format(use_daemons)) def set_standby_for(leader_fs, follower_id): fscid = leader_fs.get_namespace_id() self.set_conf("mds.{0}".format(follower_id), "mds_standby_for_fscid", fscid) # Create two filesystems which should have two ranks each fs_a = self.mds_cluster.newfs("alpha") fs_b = self.mds_cluster.newfs("bravo") fs_a.set_max_mds(2) fs_b.set_max_mds(2) # Set all the daemons to have a FSCID assignment but no other # standby preferences. set_standby_for(fs_a, mds_a) set_standby_for(fs_a, mds_b) set_standby_for(fs_b, mds_c) set_standby_for(fs_b, mds_d) # Now when we start all daemons at once, they should fall into # ranks in the right filesystem self.mds_cluster.mds_restart(mds_a) self.mds_cluster.mds_restart(mds_b) self.mds_cluster.mds_restart(mds_c) self.mds_cluster.mds_restart(mds_d) self.wait_for_daemon_start([mds_a, mds_b, mds_c, mds_d]) fs_a.wait_for_daemons() fs_b.wait_for_daemons() self.assertEqual(set(fs_a.get_active_names()), {mds_a, mds_b}) self.assertEqual(set(fs_b.get_active_names()), {mds_c, mds_d}) def test_standby_for_invalid_fscid(self): """ That an invalid standby_fscid does not cause a mon crash """ use_daemons = sorted(self.mds_cluster.mds_ids[0:3]) mds_a, mds_b, mds_c = use_daemons log.info("Using MDS daemons: {0}".format(use_daemons)) def set_standby_for_rank(leader_rank, follower_id): self.set_conf("mds.{0}".format(follower_id), "mds_standby_for_rank", leader_rank) # Create one fs fs_a = self.mds_cluster.newfs("cephfs") # Get configured mons in the cluster, so we can see if any # crashed later. configured_mons = fs_a.mon_manager.get_mon_quorum() # Set all the daemons to have a rank assignment but no other # standby preferences. set_standby_for_rank(0, mds_a) set_standby_for_rank(0, mds_b) # Set third daemon to have invalid fscid assignment and no other # standby preferences invalid_fscid = 123 self.set_conf("mds.{0}".format(mds_c), "mds_standby_for_fscid", invalid_fscid) #Restart all the daemons to make the standby preference applied self.mds_cluster.mds_restart(mds_a) self.mds_cluster.mds_restart(mds_b) self.mds_cluster.mds_restart(mds_c) self.wait_for_daemon_start([mds_a, mds_b, mds_c]) #Stop active mds daemon service of fs if (fs_a.get_active_names(), [mds_a]): self.mds_cluster.mds_stop(mds_a) self.mds_cluster.mds_fail(mds_a) fs_a.wait_for_daemons() else: self.mds_cluster.mds_stop(mds_b) self.mds_cluster.mds_fail(mds_b) fs_a.wait_for_daemons() #Get active mons from cluster active_mons = fs_a.mon_manager.get_mon_quorum() #Check for active quorum mon status and configured mon status self.assertEqual(active_mons, configured_mons, "Not all mons are in quorum Invalid standby invalid fscid test failed!")