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Diffstat (limited to 'src/ceph/qa/tasks/cephfs/test_full.py')
| -rw-r--r-- | src/ceph/qa/tasks/cephfs/test_full.py | 414 |
1 files changed, 414 insertions, 0 deletions
diff --git a/src/ceph/qa/tasks/cephfs/test_full.py b/src/ceph/qa/tasks/cephfs/test_full.py new file mode 100644 index 0000000..e69ccb3 --- /dev/null +++ b/src/ceph/qa/tasks/cephfs/test_full.py @@ -0,0 +1,414 @@ + + +import json +import logging +import os +from textwrap import dedent +import time +from teuthology.orchestra.run import CommandFailedError +from tasks.cephfs.fuse_mount import FuseMount +from tasks.cephfs.cephfs_test_case import CephFSTestCase + + +log = logging.getLogger(__name__) + + +class FullnessTestCase(CephFSTestCase): + CLIENTS_REQUIRED = 2 + + # Subclasses define whether they're filling whole cluster or just data pool + data_only = False + + # Subclasses define how many bytes should be written to achieve fullness + pool_capacity = None + fill_mb = None + + # Subclasses define what fullness means to them + def is_full(self): + raise NotImplementedError() + + def setUp(self): + CephFSTestCase.setUp(self) + + # These tests just use a single active MDS throughout, so remember its ID + # for use in mds_asok calls + self.active_mds_id = self.fs.get_active_names()[0] + + # Capture the initial OSD map epoch for later use + self.initial_osd_epoch = json.loads( + self.fs.mon_manager.raw_cluster_cmd("osd", "dump", "--format=json").strip() + )['epoch'] + + # Check the initial barrier epoch on the MDS: this should be + # set to the latest map at MDS startup. We do this check in + # setUp to get in there before subclasses might touch things + # in their own setUp functions. + self.assertGreaterEqual(self.fs.mds_asok(["status"], mds_id=self.active_mds_id)['osdmap_epoch_barrier'], + self.initial_osd_epoch) + + def test_barrier(self): + """ + That when an OSD epoch barrier is set on an MDS, subsequently + issued capabilities cause clients to update their OSD map to that + epoch. + """ + + # Sync up clients with initial MDS OSD map barrier + self.mount_a.open_no_data("foo") + self.mount_b.open_no_data("bar") + + # Grab mounts' initial OSD epochs: later we will check that + # it hasn't advanced beyond this point. + mount_a_initial_epoch = self.mount_a.get_osd_epoch()[0] + mount_b_initial_epoch = self.mount_b.get_osd_epoch()[0] + + # Freshly mounted at start of test, should be up to date with OSD map + self.assertGreaterEqual(mount_a_initial_epoch, self.initial_osd_epoch) + self.assertGreaterEqual(mount_b_initial_epoch, self.initial_osd_epoch) + + # Set and unset a flag to cause OSD epoch to increment + self.fs.mon_manager.raw_cluster_cmd("osd", "set", "pause") + self.fs.mon_manager.raw_cluster_cmd("osd", "unset", "pause") + + out = self.fs.mon_manager.raw_cluster_cmd("osd", "dump", "--format=json").strip() + new_epoch = json.loads(out)['epoch'] + self.assertNotEqual(self.initial_osd_epoch, new_epoch) + + # Do a metadata operation on clients, witness that they end up with + # the old OSD map from startup time (nothing has prompted client + # to update its map) + self.mount_a.open_no_data("alpha") + self.mount_b.open_no_data("bravo1") + + # Sleep long enough that if the OSD map was propagating it would + # have done so (this is arbitrary because we are 'waiting' for something + # to *not* happen). + time.sleep(30) + + mount_a_epoch, mount_a_barrier = self.mount_a.get_osd_epoch() + self.assertEqual(mount_a_epoch, mount_a_initial_epoch) + mount_b_epoch, mount_b_barrier = self.mount_b.get_osd_epoch() + self.assertEqual(mount_b_epoch, mount_b_initial_epoch) + + # Set a barrier on the MDS + self.fs.mds_asok(["osdmap", "barrier", new_epoch.__str__()], mds_id=self.active_mds_id) + + # Do an operation on client B, witness that it ends up with + # the latest OSD map from the barrier. This shouldn't generate any + # cap revokes to A because B was already the last one to touch + # a file in root. + self.mount_b.run_shell(["touch", "bravo2"]) + self.mount_b.open_no_data("bravo2") + + # Some time passes here because the metadata part of the operation + # completes immediately, while the resulting OSD map update happens + # asynchronously (it's an Objecter::_maybe_request_map) as a result + # of seeing the new epoch barrier. + self.wait_until_equal( + lambda: self.mount_b.get_osd_epoch(), + (new_epoch, new_epoch), + 30, + lambda x: x[0] > new_epoch or x[1] > new_epoch) + + # ...and none of this should have affected the oblivious mount a, + # because it wasn't doing any data or metadata IO + mount_a_epoch, mount_a_barrier = self.mount_a.get_osd_epoch() + self.assertEqual(mount_a_epoch, mount_a_initial_epoch) + + def _data_pool_name(self): + data_pool_names = self.fs.get_data_pool_names() + if len(data_pool_names) > 1: + raise RuntimeError("This test can't handle multiple data pools") + else: + return data_pool_names[0] + + def _test_full(self, easy_case): + """ + - That a client trying to write data to a file is prevented + from doing so with an -EFULL result + - That they are also prevented from creating new files by the MDS. + - That they may delete another file to get the system healthy again + + :param easy_case: if true, delete a successfully written file to + free up space. else, delete the file that experienced + the failed write. + """ + + osd_mon_report_interval_max = int(self.fs.get_config("osd_mon_report_interval_max", service_type='osd')) + + log.info("Writing {0}MB should fill this cluster".format(self.fill_mb)) + + # Fill up the cluster. This dd may or may not fail, as it depends on + # how soon the cluster recognises its own fullness + self.mount_a.write_n_mb("large_file_a", self.fill_mb / 2) + try: + self.mount_a.write_n_mb("large_file_b", self.fill_mb / 2) + except CommandFailedError: + log.info("Writing file B failed (full status happened already)") + assert self.is_full() + else: + log.info("Writing file B succeeded (full status will happen soon)") + self.wait_until_true(lambda: self.is_full(), + timeout=osd_mon_report_interval_max * 5) + + # Attempting to write more data should give me ENOSPC + with self.assertRaises(CommandFailedError) as ar: + self.mount_a.write_n_mb("large_file_b", 50, seek=self.fill_mb / 2) + self.assertEqual(ar.exception.exitstatus, 1) # dd returns 1 on "No space" + + # Wait for the MDS to see the latest OSD map so that it will reliably + # be applying the policy of rejecting non-deletion metadata operations + # while in the full state. + osd_epoch = json.loads(self.fs.mon_manager.raw_cluster_cmd("osd", "dump", "--format=json-pretty"))['epoch'] + self.wait_until_true( + lambda: self.fs.mds_asok(['status'], mds_id=self.active_mds_id)['osdmap_epoch'] >= osd_epoch, + timeout=10) + + if not self.data_only: + with self.assertRaises(CommandFailedError): + self.mount_a.write_n_mb("small_file_1", 0) + + # Clear out some space + if easy_case: + self.mount_a.run_shell(['rm', '-f', 'large_file_a']) + self.mount_a.run_shell(['rm', '-f', 'large_file_b']) + else: + # In the hard case it is the file that filled the system. + # Before the new #7317 (ENOSPC, epoch barrier) changes, this + # would fail because the last objects written would be + # stuck in the client cache as objecter operations. + self.mount_a.run_shell(['rm', '-f', 'large_file_b']) + self.mount_a.run_shell(['rm', '-f', 'large_file_a']) + + # Here we are waiting for two things to happen: + # * The MDS to purge the stray folder and execute object deletions + # * The OSDs to inform the mon that they are no longer full + self.wait_until_true(lambda: not self.is_full(), + timeout=osd_mon_report_interval_max * 5) + + # Wait for the MDS to see the latest OSD map so that it will reliably + # be applying the free space policy + osd_epoch = json.loads(self.fs.mon_manager.raw_cluster_cmd("osd", "dump", "--format=json-pretty"))['epoch'] + self.wait_until_true( + lambda: self.fs.mds_asok(['status'], mds_id=self.active_mds_id)['osdmap_epoch'] >= osd_epoch, + timeout=10) + + # Now I should be able to write again + self.mount_a.write_n_mb("large_file", 50, seek=0) + + # Ensure that the MDS keeps its OSD epoch barrier across a restart + + def test_full_different_file(self): + self._test_full(True) + + def test_full_same_file(self): + self._test_full(False) + + def _remote_write_test(self, template): + """ + Run some remote python in a way that's useful for + testing free space behaviour (see test_* methods using this) + """ + file_path = os.path.join(self.mount_a.mountpoint, "full_test_file") + + # Enough to trip the full flag + osd_mon_report_interval_max = int(self.fs.get_config("osd_mon_report_interval_max", service_type='osd')) + mon_tick_interval = int(self.fs.get_config("mon_tick_interval", service_type="mon")) + + # Sufficient data to cause RADOS cluster to go 'full' + log.info("pool capacity {0}, {1}MB should be enough to fill it".format(self.pool_capacity, self.fill_mb)) + + # Long enough for RADOS cluster to notice it is full and set flag on mons + # (report_interval for mon to learn PG stats, tick interval for it to update OSD map, + # factor of 1.5 for I/O + network latency in committing OSD map and distributing it + # to the OSDs) + full_wait = (osd_mon_report_interval_max + mon_tick_interval) * 1.5 + + # Configs for this test should bring this setting down in order to + # run reasonably quickly + if osd_mon_report_interval_max > 10: + log.warn("This test may run rather slowly unless you decrease" + "osd_mon_report_interval_max (5 is a good setting)!") + + self.mount_a.run_python(template.format( + fill_mb=self.fill_mb, + file_path=file_path, + full_wait=full_wait, + is_fuse=isinstance(self.mount_a, FuseMount) + )) + + def test_full_fclose(self): + # A remote script which opens a file handle, fills up the filesystem, and then + # checks that ENOSPC errors on buffered writes appear correctly as errors in fsync + remote_script = dedent(""" + import time + import datetime + import subprocess + import os + + # Write some buffered data through before going full, all should be well + print "writing some data through which we expect to succeed" + bytes = 0 + f = os.open("{file_path}", os.O_WRONLY | os.O_CREAT) + bytes += os.write(f, 'a' * 4096) + os.fsync(f) + print "fsync'ed data successfully, will now attempt to fill fs" + + # Okay, now we're going to fill up the filesystem, and then keep + # writing until we see an error from fsync. As long as we're doing + # buffered IO, the error should always only appear from fsync and not + # from write + full = False + + for n in range(0, {fill_mb}): + bytes += os.write(f, 'x' * 1024 * 1024) + print "wrote bytes via buffered write, may repeat" + print "done writing bytes" + + # OK, now we should sneak in under the full condition + # due to the time it takes the OSDs to report to the + # mons, and get a successful fsync on our full-making data + os.fsync(f) + print "successfully fsync'ed prior to getting full state reported" + + # Now wait for the full flag to get set so that our + # next flush IO will fail + time.sleep(30) + + # A buffered IO, should succeed + print "starting buffered write we expect to succeed" + os.write(f, 'x' * 4096) + print "wrote, now waiting 30s and then doing a close we expect to fail" + + # Wait long enough for a background flush that should fail + time.sleep(30) + + if {is_fuse}: + # ...and check that the failed background flush is reflected in fclose + try: + os.close(f) + except OSError: + print "close() returned an error as expected" + else: + raise RuntimeError("close() failed to raise error") + else: + # The kernel cephfs client does not raise errors on fclose + os.close(f) + + os.unlink("{file_path}") + """) + self._remote_write_test(remote_script) + + def test_full_fsync(self): + """ + That when the full flag is encountered during asynchronous + flushes, such that an fwrite() succeeds but an fsync/fclose() + should return the ENOSPC error. + """ + + # A remote script which opens a file handle, fills up the filesystem, and then + # checks that ENOSPC errors on buffered writes appear correctly as errors in fsync + remote_script = dedent(""" + import time + import datetime + import subprocess + import os + + # Write some buffered data through before going full, all should be well + print "writing some data through which we expect to succeed" + bytes = 0 + f = os.open("{file_path}", os.O_WRONLY | os.O_CREAT) + bytes += os.write(f, 'a' * 4096) + os.fsync(f) + print "fsync'ed data successfully, will now attempt to fill fs" + + # Okay, now we're going to fill up the filesystem, and then keep + # writing until we see an error from fsync. As long as we're doing + # buffered IO, the error should always only appear from fsync and not + # from write + full = False + + for n in range(0, {fill_mb} + 1): + try: + bytes += os.write(f, 'x' * 1024 * 1024) + print "wrote bytes via buffered write, moving on to fsync" + except OSError as e: + print "Unexpected error %s from write() instead of fsync()" % e + raise + + try: + os.fsync(f) + print "fsync'ed successfully" + except OSError as e: + print "Reached fullness after %.2f MB" % (bytes / (1024.0 * 1024.0)) + full = True + break + else: + print "Not full yet after %.2f MB" % (bytes / (1024.0 * 1024.0)) + + if n > {fill_mb} * 0.8: + # Be cautious in the last region where we expect to hit + # the full condition, so that we don't overshoot too dramatically + print "sleeping a bit as we've exceeded 80% of our expected full ratio" + time.sleep({full_wait}) + + if not full: + raise RuntimeError("Failed to reach fullness after writing %d bytes" % bytes) + + # close() should not raise an error because we already caught it in + # fsync. There shouldn't have been any more writeback errors + # since then because all IOs got cancelled on the full flag. + print "calling close" + os.close(f) + print "close() did not raise error" + + os.unlink("{file_path}") + """) + + self._remote_write_test(remote_script) + + +class TestQuotaFull(FullnessTestCase): + """ + Test per-pool fullness, which indicates quota limits exceeded + """ + pool_capacity = 1024 * 1024 * 32 # arbitrary low-ish limit + fill_mb = pool_capacity / (1024 * 1024) + + # We are only testing quota handling on the data pool, not the metadata + # pool. + data_only = True + + def setUp(self): + super(TestQuotaFull, self).setUp() + + pool_name = self.fs.get_data_pool_name() + self.fs.mon_manager.raw_cluster_cmd("osd", "pool", "set-quota", pool_name, + "max_bytes", "{0}".format(self.pool_capacity)) + + def is_full(self): + return self.fs.is_pool_full(self.fs.get_data_pool_name()) + + +class TestClusterFull(FullnessTestCase): + """ + Test cluster-wide fullness, which indicates that an OSD has become too full + """ + pool_capacity = None + REQUIRE_MEMSTORE = True + + def setUp(self): + super(TestClusterFull, self).setUp() + + if self.pool_capacity is None: + # This is a hack to overcome weird fluctuations in the reported + # `max_avail` attribute of pools that sometimes occurs in between + # tests (reason as yet unclear, but this dodges the issue) + TestClusterFull.pool_capacity = self.fs.get_pool_df(self._data_pool_name())['max_avail'] + TestClusterFull.fill_mb = int(1.05 * (self.pool_capacity / (1024.0 * 1024.0))) + + def is_full(self): + return self.fs.is_full() + +# Hide the parent class so that unittest.loader doesn't try to run it. +del globals()['FullnessTestCase'] |