+++ /dev/null
-
-
-from tasks.cephfs.cephfs_test_case import CephFSTestCase
-from teuthology.orchestra import run
-
-import logging
-log = logging.getLogger(__name__)
-
-
-class TestFragmentation(CephFSTestCase):
- CLIENTS_REQUIRED = 1
- MDSS_REQUIRED = 1
-
- def get_splits(self):
- return self.fs.mds_asok(['perf', 'dump', 'mds'])['mds']['dir_split']
-
- def get_merges(self):
- return self.fs.mds_asok(['perf', 'dump', 'mds'])['mds']['dir_merge']
-
- def get_dir_ino(self, path):
- dir_cache = self.fs.read_cache(path, 0)
- dir_ino = None
- dir_inono = self.mount_a.path_to_ino(path.strip("/"))
- for ino in dir_cache:
- if ino['ino'] == dir_inono:
- dir_ino = ino
- break
- self.assertIsNotNone(dir_ino)
- return dir_ino
-
- def _configure(self, **kwargs):
- """
- Apply kwargs as MDS configuration settings, enable dirfrags
- and restart the MDSs.
- """
- kwargs['mds_bal_frag'] = "true"
-
- for k, v in kwargs.items():
- self.ceph_cluster.set_ceph_conf("mds", k, v.__str__())
-
- self.fs.set_allow_dirfrags(True)
-
- self.mds_cluster.mds_fail_restart()
- self.fs.wait_for_daemons()
-
- def test_oversize(self):
- """
- That a directory is split when it becomes too large.
- """
-
- split_size = 20
- merge_size = 5
-
- self._configure(
- mds_bal_split_size=split_size,
- mds_bal_merge_size=merge_size,
- mds_bal_split_bits=1
- )
-
- self.assertEqual(self.get_splits(), 0)
-
- self.mount_a.create_n_files("splitdir/file", split_size + 1)
-
- self.wait_until_true(
- lambda: self.get_splits() == 1,
- timeout=30
- )
-
- frags = self.get_dir_ino("/splitdir")['dirfrags']
- self.assertEqual(len(frags), 2)
- self.assertEqual(frags[0]['dirfrag'], "0x10000000000.0*")
- self.assertEqual(frags[1]['dirfrag'], "0x10000000000.1*")
- self.assertEqual(
- sum([len(f['dentries']) for f in frags]),
- split_size + 1
- )
-
- self.assertEqual(self.get_merges(), 0)
-
- self.mount_a.run_shell(["rm", "-f", run.Raw("splitdir/file*")])
-
- self.wait_until_true(
- lambda: self.get_merges() == 1,
- timeout=30
- )
-
- self.assertEqual(len(self.get_dir_ino("/splitdir")["dirfrags"]), 1)
-
- def test_rapid_creation(self):
- """
- That the fast-splitting limit of 1.5x normal limit is
- applied when creating dentries quickly.
- """
-
- split_size = 100
- merge_size = 1
-
- self._configure(
- mds_bal_split_size=split_size,
- mds_bal_merge_size=merge_size,
- mds_bal_split_bits=3,
- mds_bal_fragment_size_max=int(split_size * 1.5 + 2)
- )
-
- # We test this only at a single split level. If a client was sending
- # IO so fast that it hit a second split before the first split
- # was complete, it could violate mds_bal_fragment_size_max -- there
- # is a window where the child dirfrags of a split are unfrozen
- # (so they can grow), but still have STATE_FRAGMENTING (so they
- # can't be split).
-
- # By writing 4x the split size when the split bits are set
- # to 3 (i.e. 4-ways), I am reasonably sure to see precisely
- # one split. The test is to check whether that split
- # happens soon enough that the client doesn't exceed
- # 2x the split_size (the "immediate" split mode should
- # kick in at 1.5x the split size).
-
- self.assertEqual(self.get_splits(), 0)
- self.mount_a.create_n_files("splitdir/file", split_size * 4)
- self.wait_until_equal(
- self.get_splits,
- 1,
- reject_fn=lambda s: s > 1,
- timeout=30
- )
-
- def test_deep_split(self):
- """
- That when the directory grows many times larger than split size,
- the fragments get split again.
- """
-
- split_size = 100
- merge_size = 1 # i.e. don't merge frag unless its empty
- split_bits = 1
-
- branch_factor = 2**split_bits
-
- # Arbitrary: how many levels shall we try fragmenting before
- # ending the test?
- max_depth = 5
-
- self._configure(
- mds_bal_split_size=split_size,
- mds_bal_merge_size=merge_size,
- mds_bal_split_bits=split_bits
- )
-
- # Each iteration we will create another level of fragments. The
- # placement of dentries into fragments is by hashes (i.e. pseudo
- # random), so we rely on statistics to get the behaviour that
- # by writing about 1.5x as many dentries as the split_size times
- # the number of frags, we will get them all to exceed their
- # split size and trigger a split.
- depth = 0
- files_written = 0
- splits_expected = 0
- while depth < max_depth:
- log.info("Writing files for depth {0}".format(depth))
- target_files = branch_factor**depth * int(split_size * 1.5)
- create_files = target_files - files_written
-
- self.ceph_cluster.mon_manager.raw_cluster_cmd("log",
- "{0} Writing {1} files (depth={2})".format(
- self.__class__.__name__, create_files, depth
- ))
- self.mount_a.create_n_files("splitdir/file_{0}".format(depth),
- create_files)
- self.ceph_cluster.mon_manager.raw_cluster_cmd("log",
- "{0} Done".format(self.__class__.__name__))
-
- files_written += create_files
- log.info("Now have {0} files".format(files_written))
-
- splits_expected += branch_factor**depth
- log.info("Waiting to see {0} splits".format(splits_expected))
- try:
- self.wait_until_equal(
- self.get_splits,
- splits_expected,
- timeout=30,
- reject_fn=lambda x: x > splits_expected
- )
-
- frags = self.get_dir_ino("/splitdir")['dirfrags']
- self.assertEqual(len(frags), branch_factor**(depth+1))
- self.assertEqual(
- sum([len(f['dentries']) for f in frags]),
- target_files
- )
- except:
- # On failures, log what fragmentation we actually ended
- # up with. This block is just for logging, at the end
- # we raise the exception again.
- frags = self.get_dir_ino("/splitdir")['dirfrags']
- log.info("depth={0} splits_expected={1} files_written={2}".format(
- depth, splits_expected, files_written
- ))
- log.info("Dirfrags:")
- for f in frags:
- log.info("{0}: {1}".format(
- f['dirfrag'], len(f['dentries'])
- ))
- raise
-
- depth += 1
-
- # Remember the inode number because we will be checking for
- # objects later.
- dir_inode_no = self.mount_a.path_to_ino("splitdir")
-
- self.mount_a.run_shell(["rm", "-rf", "splitdir/"])
- self.mount_a.umount_wait()
-
- self.fs.mds_asok(['flush', 'journal'])
-
- # Wait for all strays to purge
- self.wait_until_equal(
- lambda: self.fs.mds_asok(['perf', 'dump', 'mds_cache']
- )['mds_cache']['num_strays'],
- 0,
- timeout=1200
- )
- # Check that the metadata pool objects for all the myriad
- # child fragments are gone
- metadata_objs = self.fs.rados(["ls"])
- frag_objs = []
- for o in metadata_objs:
- if o.startswith("{0:x}.".format(dir_inode_no)):
- frag_objs.append(o)
- self.assertListEqual(frag_objs, [])
Code Review / stor4nfv.git / blobdiff