ceph/qa/tasks/cephfs/test_failover.py

   1 import json
   2 import logging
   3 from unittest import case, SkipTest
   4
   5 from cephfs_test_case import CephFSTestCase
   6 from teuthology.exceptions import CommandFailedError
   7 from teuthology import misc as teuthology
   8 from tasks.cephfs.fuse_mount import FuseMount
   9
  10 log = logging.getLogger(__name__)
  11
  12
  13 class TestFailover(CephFSTestCase):
  14     CLIENTS_REQUIRED = 1
  15     MDSS_REQUIRED = 2
  16
  17     def test_simple(self):
  18         """
  19         That when the active MDS is killed, a standby MDS is promoted into
  20         its rank after the grace period.
  21
  22         This is just a simple unit test, the harder cases are covered
  23         in thrashing tests.
  24         """
  25
  26         # Need all my standbys up as well as the active daemons
  27         self.wait_for_daemon_start()
  28
  29         (original_active, ) = self.fs.get_active_names()
  30         original_standbys = self.mds_cluster.get_standby_daemons()
  31
  32         # Kill the rank 0 daemon's physical process
  33         self.fs.mds_stop(original_active)
  34
  35         grace = int(self.fs.get_config("mds_beacon_grace", service_type="mon"))
  36
  37         # Wait until the monitor promotes his replacement
  38         def promoted():
  39             active = self.fs.get_active_names()
  40             return active and active[0] in original_standbys
  41
  42         log.info("Waiting for promotion of one of the original standbys {0}".format(
  43             original_standbys))
  44         self.wait_until_true(
  45             promoted,
  46             timeout=grace*2)
  47
  48         # Start the original rank 0 daemon up again, see that he becomes a standby
  49         self.fs.mds_restart(original_active)
  50         self.wait_until_true(
  51             lambda: original_active in self.mds_cluster.get_standby_daemons(),
  52             timeout=60  # Approximately long enough for MDS to start and mon to notice
  53         )
  54
  55     def test_client_abort(self):
  56         """
  57         That a client will respect fuse_require_active_mds and error out
  58         when the cluster appears to be unavailable.
  59         """
  60
  61         if not isinstance(self.mount_a, FuseMount):
  62             raise SkipTest("Requires FUSE client to inject client metadata")
  63
  64         require_active = self.fs.get_config("fuse_require_active_mds", service_type="mon").lower() == "true"
  65         if not require_active:
  66             raise case.SkipTest("fuse_require_active_mds is not set")
  67
  68         grace = int(self.fs.get_config("mds_beacon_grace", service_type="mon"))
  69
  70         # Check it's not laggy to begin with
  71         (original_active, ) = self.fs.get_active_names()
  72         self.assertNotIn("laggy_since", self.fs.mon_manager.get_mds_status(original_active))
  73
  74         self.mounts[0].umount_wait()
  75
  76         # Control: that we can mount and unmount usually, while the cluster is healthy
  77         self.mounts[0].mount()
  78         self.mounts[0].wait_until_mounted()
  79         self.mounts[0].umount_wait()
  80
  81         # Stop the daemon processes
  82         self.fs.mds_stop()
  83
  84         # Wait for everyone to go laggy
  85         def laggy():
  86             mdsmap = self.fs.get_mds_map()
  87             for info in mdsmap['info'].values():
  88                 if "laggy_since" not in info:
  89                     return False
  90
  91             return True
  92
  93         self.wait_until_true(laggy, grace * 2)
  94         with self.assertRaises(CommandFailedError):
  95             self.mounts[0].mount()
  96
  97     def test_standby_count_wanted(self):
  98         """
  99         That cluster health warnings are generated by insufficient standbys available.
 100         """
 101
 102         # Need all my standbys up as well as the active daemons
 103         self.wait_for_daemon_start()
 104
 105         grace = int(self.fs.get_config("mds_beacon_grace", service_type="mon"))
 106
 107         standbys = self.mds_cluster.get_standby_daemons()
 108         self.assertGreaterEqual(len(standbys), 1)
 109         self.fs.mon_manager.raw_cluster_cmd('fs', 'set', self.fs.name, 'standby_count_wanted', str(len(standbys)))
 110
 111         # Kill a standby and check for warning
 112         victim = standbys.pop()
 113         self.fs.mds_stop(victim)
 114         log.info("waiting for insufficient standby daemon warning")
 115         self.wait_for_health("MDS_INSUFFICIENT_STANDBY", grace*2)
 116
 117         # restart the standby, see that he becomes a standby, check health clears
 118         self.fs.mds_restart(victim)
 119         self.wait_until_true(
 120             lambda: victim in self.mds_cluster.get_standby_daemons(),
 121             timeout=60  # Approximately long enough for MDS to start and mon to notice
 122         )
 123         self.wait_for_health_clear(timeout=30)
 124
 125         # Set it one greater than standbys ever seen
 126         standbys = self.mds_cluster.get_standby_daemons()
 127         self.assertGreaterEqual(len(standbys), 1)
 128         self.fs.mon_manager.raw_cluster_cmd('fs', 'set', self.fs.name, 'standby_count_wanted', str(len(standbys)+1))
 129         log.info("waiting for insufficient standby daemon warning")
 130         self.wait_for_health("MDS_INSUFFICIENT_STANDBY", grace*2)
 131
 132         # Set it to 0
 133         self.fs.mon_manager.raw_cluster_cmd('fs', 'set', self.fs.name, 'standby_count_wanted', '0')
 134         self.wait_for_health_clear(timeout=30)
 135
 136
 137
 138
 139 class TestStandbyReplay(CephFSTestCase):
 140     MDSS_REQUIRED = 4
 141     REQUIRE_FILESYSTEM = False
 142
 143     def set_standby_for(self, leader, follower, replay):
 144         self.set_conf("mds.{0}".format(follower), "mds_standby_for_name", leader)
 145         if replay:
 146             self.set_conf("mds.{0}".format(follower), "mds_standby_replay", "true")
 147
 148     def get_info_by_name(self, mds_name):
 149         status = self.mds_cluster.status()
 150         info = status.get_mds(mds_name)
 151         if info is None:
 152             log.warn(str(status))
 153             raise RuntimeError("MDS '{0}' not found".format(mds_name))
 154         else:
 155             return info
 156
 157     def test_standby_replay_unused(self):
 158         # Pick out exactly 3 daemons to be run during test
 159         use_daemons = sorted(self.mds_cluster.mds_ids[0:3])
 160         mds_a, mds_b, mds_c = use_daemons
 161         log.info("Using MDS daemons: {0}".format(use_daemons))
 162
 163         # B and C should both follow A, but only one will
 164         # really get into standby replay state.
 165         self.set_standby_for(mds_a, mds_b, True)
 166         self.set_standby_for(mds_a, mds_c, True)
 167
 168         # Create FS and start A
 169         fs_a = self.mds_cluster.newfs("alpha")
 170         self.mds_cluster.mds_restart(mds_a)
 171         fs_a.wait_for_daemons()
 172         self.assertEqual(fs_a.get_active_names(), [mds_a])
 173
 174         # Start B, he should go into standby replay
 175         self.mds_cluster.mds_restart(mds_b)
 176         self.wait_for_daemon_start([mds_b])
 177         info_b = self.get_info_by_name(mds_b)
 178         self.assertEqual(info_b['state'], "up:standby-replay")
 179         self.assertEqual(info_b['standby_for_name'], mds_a)
 180         self.assertEqual(info_b['rank'], 0)
 181
 182         # Start C, he should go into standby (*not* replay)
 183         self.mds_cluster.mds_restart(mds_c)
 184         self.wait_for_daemon_start([mds_c])
 185         info_c = self.get_info_by_name(mds_c)
 186         self.assertEqual(info_c['state'], "up:standby")
 187         self.assertEqual(info_c['standby_for_name'], mds_a)
 188         self.assertEqual(info_c['rank'], -1)
 189
 190         # Kill B, C should go into standby replay
 191         self.mds_cluster.mds_stop(mds_b)
 192         self.mds_cluster.mds_fail(mds_b)
 193         self.wait_until_equal(
 194                 lambda: self.get_info_by_name(mds_c)['state'],
 195                 "up:standby-replay",
 196                 60)
 197         info_c = self.get_info_by_name(mds_c)
 198         self.assertEqual(info_c['state'], "up:standby-replay")
 199         self.assertEqual(info_c['standby_for_name'], mds_a)
 200         self.assertEqual(info_c['rank'], 0)
 201
 202     def test_standby_failure(self):
 203         """
 204         That the failure of a standby-replay daemon happens cleanly
 205         and doesn't interrupt anything else.
 206         """
 207         # Pick out exactly 2 daemons to be run during test
 208         use_daemons = sorted(self.mds_cluster.mds_ids[0:2])
 209         mds_a, mds_b = use_daemons
 210         log.info("Using MDS daemons: {0}".format(use_daemons))
 211
 212         # Configure two pairs of MDSs that are standby for each other
 213         self.set_standby_for(mds_a, mds_b, True)
 214         self.set_standby_for(mds_b, mds_a, False)
 215
 216         # Create FS alpha and get mds_a to come up as active
 217         fs_a = self.mds_cluster.newfs("alpha")
 218         self.mds_cluster.mds_restart(mds_a)
 219         fs_a.wait_for_daemons()
 220         self.assertEqual(fs_a.get_active_names(), [mds_a])
 221
 222         # Start the standbys
 223         self.mds_cluster.mds_restart(mds_b)
 224         self.wait_for_daemon_start([mds_b])
 225
 226         # See the standby come up as the correct rank
 227         info_b = self.get_info_by_name(mds_b)
 228         self.assertEqual(info_b['state'], "up:standby-replay")
 229         self.assertEqual(info_b['standby_for_name'], mds_a)
 230         self.assertEqual(info_b['rank'], 0)
 231
 232         # Kill the standby
 233         self.mds_cluster.mds_stop(mds_b)
 234         self.mds_cluster.mds_fail(mds_b)
 235
 236         # See that the standby is gone and the active remains
 237         self.assertEqual(fs_a.get_active_names(), [mds_a])
 238         mds_map = fs_a.get_mds_map()
 239         self.assertEqual(len(mds_map['info']), 1)
 240         self.assertEqual(mds_map['failed'], [])
 241         self.assertEqual(mds_map['damaged'], [])
 242         self.assertEqual(mds_map['stopped'], [])
 243
 244     def test_rank_stopped(self):
 245         """
 246         That when a rank is STOPPED, standby replays for
 247         that rank get torn down
 248         """
 249         # Pick out exactly 2 daemons to be run during test
 250         use_daemons = sorted(self.mds_cluster.mds_ids[0:4])
 251         mds_a, mds_b, mds_a_s, mds_b_s = use_daemons
 252         log.info("Using MDS daemons: {0}".format(use_daemons))
 253
 254         # a and b both get a standby
 255         self.set_standby_for(mds_a, mds_a_s, True)
 256         self.set_standby_for(mds_b, mds_b_s, True)
 257
 258         # Create FS alpha and get mds_a to come up as active
 259         fs_a = self.mds_cluster.newfs("alpha")
 260         fs_a.set_max_mds(2)
 261
 262         self.mds_cluster.mds_restart(mds_a)
 263         self.wait_until_equal(lambda: fs_a.get_active_names(), [mds_a], 30)
 264         self.mds_cluster.mds_restart(mds_b)
 265         fs_a.wait_for_daemons()
 266         self.assertEqual(sorted(fs_a.get_active_names()), [mds_a, mds_b])
 267
 268         # Start the standbys
 269         self.mds_cluster.mds_restart(mds_b_s)
 270         self.wait_for_daemon_start([mds_b_s])
 271         self.mds_cluster.mds_restart(mds_a_s)
 272         self.wait_for_daemon_start([mds_a_s])
 273         info_b_s = self.get_info_by_name(mds_b_s)
 274         self.assertEqual(info_b_s['state'], "up:standby-replay")
 275         info_a_s = self.get_info_by_name(mds_a_s)
 276         self.assertEqual(info_a_s['state'], "up:standby-replay")
 277
 278         # Shrink the cluster
 279         fs_a.set_max_mds(1)
 280         fs_a.mon_manager.raw_cluster_cmd("mds", "stop", "{0}:1".format(fs_a.name))
 281         self.wait_until_equal(
 282             lambda: fs_a.get_active_names(), [mds_a],
 283             60
 284         )
 285
 286         # Both 'b' and 'b_s' should go back to being standbys
 287         self.wait_until_equal(
 288             lambda: self.mds_cluster.get_standby_daemons(), {mds_b, mds_b_s},
 289             60
 290         )
 291
 292
 293 class TestMultiFilesystems(CephFSTestCase):
 294     CLIENTS_REQUIRED = 2
 295     MDSS_REQUIRED = 4
 296
 297     # We'll create our own filesystems and start our own daemons
 298     REQUIRE_FILESYSTEM = False
 299
 300     def setUp(self):
 301         super(TestMultiFilesystems, self).setUp()
 302         self.mds_cluster.mon_manager.raw_cluster_cmd("fs", "flag", "set",
 303             "enable_multiple", "true",
 304             "--yes-i-really-mean-it")
 305
 306     def _setup_two(self):
 307         fs_a = self.mds_cluster.newfs("alpha")
 308         fs_b = self.mds_cluster.newfs("bravo")
 309
 310         self.mds_cluster.mds_restart()
 311
 312         # Wait for both filesystems to go healthy
 313         fs_a.wait_for_daemons()
 314         fs_b.wait_for_daemons()
 315
 316         # Reconfigure client auth caps
 317         for mount in self.mounts:
 318             self.mds_cluster.mon_manager.raw_cluster_cmd_result(
 319                 'auth', 'caps', "client.{0}".format(mount.client_id),
 320                 'mds', 'allow',
 321                 'mon', 'allow r',
 322                 'osd', 'allow rw pool={0}, allow rw pool={1}'.format(
 323                     fs_a.get_data_pool_name(), fs_b.get_data_pool_name()))
 324
 325         return fs_a, fs_b
 326
 327     def test_clients(self):
 328         fs_a, fs_b = self._setup_two()
 329
 330         # Mount a client on fs_a
 331         self.mount_a.mount(mount_fs_name=fs_a.name)
 332         self.mount_a.write_n_mb("pad.bin", 1)
 333         self.mount_a.write_n_mb("test.bin", 2)
 334         a_created_ino = self.mount_a.path_to_ino("test.bin")
 335         self.mount_a.create_files()
 336
 337         # Mount a client on fs_b
 338         self.mount_b.mount(mount_fs_name=fs_b.name)
 339         self.mount_b.write_n_mb("test.bin", 1)
 340         b_created_ino = self.mount_b.path_to_ino("test.bin")
 341         self.mount_b.create_files()
 342
 343         # Check that a non-default filesystem mount survives an MDS
 344         # failover (i.e. that map subscription is continuous, not
 345         # just the first time), reproduces #16022
 346         old_fs_b_mds = fs_b.get_active_names()[0]
 347         self.mds_cluster.mds_stop(old_fs_b_mds)
 348         self.mds_cluster.mds_fail(old_fs_b_mds)
 349         fs_b.wait_for_daemons()
 350         background = self.mount_b.write_background()
 351         # Raise exception if the write doesn't finish (i.e. if client
 352         # has not kept up with MDS failure)
 353         try:
 354             self.wait_until_true(lambda: background.finished, timeout=30)
 355         except RuntimeError:
 356             # The mount is stuck, we'll have to force it to fail cleanly
 357             background.stdin.close()
 358             self.mount_b.umount_wait(force=True)
 359             raise
 360
 361         self.mount_a.umount_wait()
 362         self.mount_b.umount_wait()
 363
 364         # See that the client's files went into the correct pool
 365         self.assertTrue(fs_a.data_objects_present(a_created_ino, 1024 * 1024))
 366         self.assertTrue(fs_b.data_objects_present(b_created_ino, 1024 * 1024))
 367
 368     def test_standby(self):
 369         fs_a, fs_b = self._setup_two()
 370
 371         # Assert that the remaining two MDS daemons are now standbys
 372         a_daemons = fs_a.get_active_names()
 373         b_daemons = fs_b.get_active_names()
 374         self.assertEqual(len(a_daemons), 1)
 375         self.assertEqual(len(b_daemons), 1)
 376         original_a = a_daemons[0]
 377         original_b = b_daemons[0]
 378         expect_standby_daemons = set(self.mds_cluster.mds_ids) - (set(a_daemons) | set(b_daemons))
 379
 380         # Need all my standbys up as well as the active daemons
 381         self.wait_for_daemon_start()
 382         self.assertEqual(expect_standby_daemons, self.mds_cluster.get_standby_daemons())
 383
 384         # Kill fs_a's active MDS, see a standby take over
 385         self.mds_cluster.mds_stop(original_a)
 386         self.mds_cluster.mon_manager.raw_cluster_cmd("mds", "fail", original_a)
 387         self.wait_until_equal(lambda: len(fs_a.get_active_names()), 1, 30,
 388                               reject_fn=lambda v: v > 1)
 389         # Assert that it's a *different* daemon that has now appeared in the map for fs_a
 390         self.assertNotEqual(fs_a.get_active_names()[0], original_a)
 391
 392         # Kill fs_b's active MDS, see a standby take over
 393         self.mds_cluster.mds_stop(original_b)
 394         self.mds_cluster.mon_manager.raw_cluster_cmd("mds", "fail", original_b)
 395         self.wait_until_equal(lambda: len(fs_b.get_active_names()), 1, 30,
 396                               reject_fn=lambda v: v > 1)
 397         # Assert that it's a *different* daemon that has now appeared in the map for fs_a
 398         self.assertNotEqual(fs_b.get_active_names()[0], original_b)
 399
 400         # Both of the original active daemons should be gone, and all standbys used up
 401         self.assertEqual(self.mds_cluster.get_standby_daemons(), set())
 402
 403         # Restart the ones I killed, see them reappear as standbys
 404         self.mds_cluster.mds_restart(original_a)
 405         self.mds_cluster.mds_restart(original_b)
 406         self.wait_until_true(
 407             lambda: {original_a, original_b} == self.mds_cluster.get_standby_daemons(),
 408             timeout=30
 409         )
 410
 411     def test_grow_shrink(self):
 412         # Usual setup...
 413         fs_a, fs_b = self._setup_two()
 414
 415         # Increase max_mds on fs_b, see a standby take up the role
 416         fs_b.set_max_mds(2)
 417         self.wait_until_equal(lambda: len(fs_b.get_active_names()), 2, 30,
 418                               reject_fn=lambda v: v > 2 or v < 1)
 419
 420         # Increase max_mds on fs_a, see a standby take up the role
 421         fs_a.set_max_mds(2)
 422         self.wait_until_equal(lambda: len(fs_a.get_active_names()), 2, 30,
 423                               reject_fn=lambda v: v > 2 or v < 1)
 424
 425         # Shrink fs_b back to 1, see a daemon go back to standby
 426         fs_b.set_max_mds(1)
 427         fs_b.deactivate(1)
 428         self.wait_until_equal(lambda: len(fs_b.get_active_names()), 1, 30,
 429                               reject_fn=lambda v: v > 2 or v < 1)
 430
 431         # Grow fs_a up to 3, see the former fs_b daemon join it.
 432         fs_a.set_max_mds(3)
 433         self.wait_until_equal(lambda: len(fs_a.get_active_names()), 3, 60,
 434                               reject_fn=lambda v: v > 3 or v < 2)
 435
 436     def test_standby_for_name(self):
 437         # Pick out exactly 4 daemons to be run during test
 438         use_daemons = sorted(self.mds_cluster.mds_ids[0:4])
 439         mds_a, mds_b, mds_c, mds_d = use_daemons
 440         log.info("Using MDS daemons: {0}".format(use_daemons))
 441
 442         def set_standby_for(leader, follower, replay):
 443             self.set_conf("mds.{0}".format(follower), "mds_standby_for_name", leader)
 444             if replay:
 445                 self.set_conf("mds.{0}".format(follower), "mds_standby_replay", "true")
 446
 447         # Configure two pairs of MDSs that are standby for each other
 448         set_standby_for(mds_a, mds_b, True)
 449         set_standby_for(mds_b, mds_a, False)
 450         set_standby_for(mds_c, mds_d, True)
 451         set_standby_for(mds_d, mds_c, False)
 452
 453         # Create FS alpha and get mds_a to come up as active
 454         fs_a = self.mds_cluster.newfs("alpha")
 455         self.mds_cluster.mds_restart(mds_a)
 456         fs_a.wait_for_daemons()
 457         self.assertEqual(fs_a.get_active_names(), [mds_a])
 458
 459         # Create FS bravo and get mds_c to come up as active
 460         fs_b = self.mds_cluster.newfs("bravo")
 461         self.mds_cluster.mds_restart(mds_c)
 462         fs_b.wait_for_daemons()
 463         self.assertEqual(fs_b.get_active_names(), [mds_c])
 464
 465         # Start the standbys
 466         self.mds_cluster.mds_restart(mds_b)
 467         self.mds_cluster.mds_restart(mds_d)
 468         self.wait_for_daemon_start([mds_b, mds_d])
 469
 470         def get_info_by_name(fs, mds_name):
 471             mds_map = fs.get_mds_map()
 472             for gid_str, info in mds_map['info'].items():
 473                 if info['name'] == mds_name:
 474                     return info
 475
 476             log.warn(json.dumps(mds_map, indent=2))
 477             raise RuntimeError("MDS '{0}' not found in filesystem MDSMap".format(mds_name))
 478
 479         # See both standbys come up as standby replay for the correct ranks
 480         # mds_b should be in filesystem alpha following mds_a
 481         info_b = get_info_by_name(fs_a, mds_b)
 482         self.assertEqual(info_b['state'], "up:standby-replay")
 483         self.assertEqual(info_b['standby_for_name'], mds_a)
 484         self.assertEqual(info_b['rank'], 0)
 485         # mds_d should be in filesystem alpha following mds_c
 486         info_d = get_info_by_name(fs_b, mds_d)
 487         self.assertEqual(info_d['state'], "up:standby-replay")
 488         self.assertEqual(info_d['standby_for_name'], mds_c)
 489         self.assertEqual(info_d['rank'], 0)
 490
 491         # Kill both active daemons
 492         self.mds_cluster.mds_stop(mds_a)
 493         self.mds_cluster.mds_fail(mds_a)
 494         self.mds_cluster.mds_stop(mds_c)
 495         self.mds_cluster.mds_fail(mds_c)
 496
 497         # Wait for standbys to take over
 498         fs_a.wait_for_daemons()
 499         self.assertEqual(fs_a.get_active_names(), [mds_b])
 500         fs_b.wait_for_daemons()
 501         self.assertEqual(fs_b.get_active_names(), [mds_d])
 502
 503         # Start the original active daemons up again
 504         self.mds_cluster.mds_restart(mds_a)
 505         self.mds_cluster.mds_restart(mds_c)
 506         self.wait_for_daemon_start([mds_a, mds_c])
 507
 508         self.assertEqual(set(self.mds_cluster.get_standby_daemons()),
 509                          {mds_a, mds_c})
 510
 511     def test_standby_for_rank(self):
 512         use_daemons = sorted(self.mds_cluster.mds_ids[0:4])
 513         mds_a, mds_b, mds_c, mds_d = use_daemons
 514         log.info("Using MDS daemons: {0}".format(use_daemons))
 515
 516         def set_standby_for(leader_rank, leader_fs, follower_id):
 517             self.set_conf("mds.{0}".format(follower_id),
 518                           "mds_standby_for_rank", leader_rank)
 519
 520             fscid = leader_fs.get_namespace_id()
 521             self.set_conf("mds.{0}".format(follower_id),
 522                           "mds_standby_for_fscid", fscid)
 523
 524         fs_a = self.mds_cluster.newfs("alpha")
 525         fs_b = self.mds_cluster.newfs("bravo")
 526         set_standby_for(0, fs_a, mds_a)
 527         set_standby_for(0, fs_a, mds_b)
 528         set_standby_for(0, fs_b, mds_c)
 529         set_standby_for(0, fs_b, mds_d)
 530
 531         self.mds_cluster.mds_restart(mds_a)
 532         fs_a.wait_for_daemons()
 533         self.assertEqual(fs_a.get_active_names(), [mds_a])
 534
 535         self.mds_cluster.mds_restart(mds_c)
 536         fs_b.wait_for_daemons()
 537         self.assertEqual(fs_b.get_active_names(), [mds_c])
 538
 539         self.mds_cluster.mds_restart(mds_b)
 540         self.mds_cluster.mds_restart(mds_d)
 541         self.wait_for_daemon_start([mds_b, mds_d])
 542
 543         self.mds_cluster.mds_stop(mds_a)
 544         self.mds_cluster.mds_fail(mds_a)
 545         self.mds_cluster.mds_stop(mds_c)
 546         self.mds_cluster.mds_fail(mds_c)
 547
 548         fs_a.wait_for_daemons()
 549         self.assertEqual(fs_a.get_active_names(), [mds_b])
 550         fs_b.wait_for_daemons()
 551         self.assertEqual(fs_b.get_active_names(), [mds_d])
 552
 553     def test_standby_for_fscid(self):
 554         """
 555         That I can set a standby FSCID with no rank, and the result is
 556         that daemons join any rank for that filesystem.
 557         """
 558         use_daemons = sorted(self.mds_cluster.mds_ids[0:4])
 559         mds_a, mds_b, mds_c, mds_d = use_daemons
 560
 561         log.info("Using MDS daemons: {0}".format(use_daemons))
 562
 563         def set_standby_for(leader_fs, follower_id):
 564             fscid = leader_fs.get_namespace_id()
 565             self.set_conf("mds.{0}".format(follower_id),
 566                           "mds_standby_for_fscid", fscid)
 567
 568         # Create two filesystems which should have two ranks each
 569         fs_a = self.mds_cluster.newfs("alpha")
 570
 571         fs_b = self.mds_cluster.newfs("bravo")
 572
 573         fs_a.set_max_mds(2)
 574         fs_b.set_max_mds(2)
 575
 576         # Set all the daemons to have a FSCID assignment but no other
 577         # standby preferences.
 578         set_standby_for(fs_a, mds_a)
 579         set_standby_for(fs_a, mds_b)
 580         set_standby_for(fs_b, mds_c)
 581         set_standby_for(fs_b, mds_d)
 582
 583         # Now when we start all daemons at once, they should fall into
 584         # ranks in the right filesystem
 585         self.mds_cluster.mds_restart(mds_a)
 586         self.mds_cluster.mds_restart(mds_b)
 587         self.mds_cluster.mds_restart(mds_c)
 588         self.mds_cluster.mds_restart(mds_d)
 589         self.wait_for_daemon_start([mds_a, mds_b, mds_c, mds_d])
 590         fs_a.wait_for_daemons()
 591         fs_b.wait_for_daemons()
 592         self.assertEqual(set(fs_a.get_active_names()), {mds_a, mds_b})
 593         self.assertEqual(set(fs_b.get_active_names()), {mds_c, mds_d})
 594
 595     def test_standby_for_invalid_fscid(self):
 596         """
 597         That an invalid standby_fscid does not cause a mon crash
 598         """
 599         use_daemons = sorted(self.mds_cluster.mds_ids[0:3])
 600         mds_a, mds_b, mds_c = use_daemons
 601         log.info("Using MDS daemons: {0}".format(use_daemons))
 602
 603         def set_standby_for_rank(leader_rank, follower_id):
 604             self.set_conf("mds.{0}".format(follower_id),
 605                           "mds_standby_for_rank", leader_rank)
 606
 607         # Create one fs
 608         fs_a = self.mds_cluster.newfs("cephfs")
 609
 610         # Get configured mons in the cluster, so we can see if any
 611         # crashed later.
 612         configured_mons = fs_a.mon_manager.get_mon_quorum()
 613
 614         # Set all the daemons to have a rank assignment but no other
 615         # standby preferences.
 616         set_standby_for_rank(0, mds_a)
 617         set_standby_for_rank(0, mds_b)
 618
 619         # Set third daemon to have invalid fscid assignment and no other
 620         # standby preferences
 621         invalid_fscid = 123
 622         self.set_conf("mds.{0}".format(mds_c), "mds_standby_for_fscid", invalid_fscid)
 623
 624         #Restart all the daemons to make the standby preference applied
 625         self.mds_cluster.mds_restart(mds_a)
 626         self.mds_cluster.mds_restart(mds_b)
 627         self.mds_cluster.mds_restart(mds_c)
 628         self.wait_for_daemon_start([mds_a, mds_b, mds_c])
 629
 630         #Stop active mds daemon service of fs
 631         if (fs_a.get_active_names(), [mds_a]):
 632             self.mds_cluster.mds_stop(mds_a)
 633             self.mds_cluster.mds_fail(mds_a)
 634             fs_a.wait_for_daemons()
 635         else:
 636             self.mds_cluster.mds_stop(mds_b)
 637             self.mds_cluster.mds_fail(mds_b)
 638             fs_a.wait_for_daemons()
 639
 640         #Get active mons from cluster
 641         active_mons = fs_a.mon_manager.get_mon_quorum()
 642
 643         #Check for active quorum mon status and configured mon status
 644         self.assertEqual(active_mons, configured_mons,
 645                 "Not all mons are in quorum Invalid standby invalid fscid test failed!")