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from textwrap import dedent
from tasks.cephfs.cephfs_test_case import CephFSTestCase
from tasks.cephfs.filesystem import ObjectNotFound, ROOT_INO
class TestFlush(CephFSTestCase):
def test_flush(self):
self.mount_a.run_shell(["mkdir", "mydir"])
self.mount_a.run_shell(["touch", "mydir/alpha"])
dir_ino = self.mount_a.path_to_ino("mydir")
file_ino = self.mount_a.path_to_ino("mydir/alpha")
# Unmount the client so that it isn't still holding caps
self.mount_a.umount_wait()
# Before flush, the dirfrag object does not exist
with self.assertRaises(ObjectNotFound):
self.fs.list_dirfrag(dir_ino)
# Before flush, the file's backtrace has not been written
with self.assertRaises(ObjectNotFound):
self.fs.read_backtrace(file_ino)
# Before flush, there are no dentries in the root
self.assertEqual(self.fs.list_dirfrag(ROOT_INO), [])
# Execute flush
flush_data = self.fs.mds_asok(["flush", "journal"])
self.assertEqual(flush_data['return_code'], 0)
# After flush, the dirfrag object has been created
dir_list = self.fs.list_dirfrag(dir_ino)
self.assertEqual(dir_list, ["alpha_head"])
# And the 'mydir' dentry is in the root
self.assertEqual(self.fs.list_dirfrag(ROOT_INO), ['mydir_head'])
# ...and the data object has its backtrace
backtrace = self.fs.read_backtrace(file_ino)
self.assertEqual(['alpha', 'mydir'], [a['dname'] for a in backtrace['ancestors']])
self.assertEqual([dir_ino, 1], [a['dirino'] for a in backtrace['ancestors']])
self.assertEqual(file_ino, backtrace['ino'])
# ...and the journal is truncated to just a single subtreemap from the
# newly created segment
summary_output = self.fs.journal_tool(["event", "get", "summary"], 0)
try:
self.assertEqual(summary_output,
dedent(
"""
Events by type:
SUBTREEMAP: 1
Errors: 0
"""
).strip())
except AssertionError:
# In some states, flushing the journal will leave you
# an extra event from locks a client held. This is
# correct behaviour: the MDS is flushing the journal,
# it's just that new events are getting added too.
# In this case, we should nevertheless see a fully
# empty journal after a second flush.
self.assertEqual(summary_output,
dedent(
"""
Events by type:
SUBTREEMAP: 1
UPDATE: 1
Errors: 0
"""
).strip())
flush_data = self.fs.mds_asok(["flush", "journal"])
self.assertEqual(flush_data['return_code'], 0)
self.assertEqual(self.fs.journal_tool(["event", "get", "summary"], 0),
dedent(
"""
Events by type:
SUBTREEMAP: 1
Errors: 0
"""
).strip())
# Now for deletion!
# We will count the RADOS deletions and MDS file purges, to verify that
# the expected behaviour is happening as a result of the purge
initial_dels = self.fs.mds_asok(['perf', 'dump', 'objecter'])['objecter']['osdop_delete']
initial_purges = self.fs.mds_asok(['perf', 'dump', 'mds_cache'])['mds_cache']['strays_enqueued']
# Use a client to delete a file
self.mount_a.mount_wait()
self.mount_a.run_shell(["rm", "-rf", "mydir"])
# Flush the journal so that the directory inode can be purged
flush_data = self.fs.mds_asok(["flush", "journal"])
self.assertEqual(flush_data['return_code'], 0)
# We expect to see a single file purge
self.wait_until_true(
lambda: self.fs.mds_asok(['perf', 'dump', 'mds_cache'])['mds_cache']['strays_enqueued'] - initial_purges >= 2,
60)
# We expect two deletions, one of the dirfrag and one of the backtrace
self.wait_until_true(
lambda: self.fs.mds_asok(['perf', 'dump', 'objecter'])['objecter']['osdop_delete'] - initial_dels >= 2,
60) # timeout is fairly long to allow for tick+rados latencies
with self.assertRaises(ObjectNotFound):
self.fs.list_dirfrag(dir_ino)
with self.assertRaises(ObjectNotFound):
self.fs.read_backtrace(file_ino)
self.assertEqual(self.fs.list_dirfrag(ROOT_INO), [])
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