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from StringIO import StringIO
import json
import logging
from unittest import SkipTest
from tasks.cephfs.fuse_mount import FuseMount
from teuthology.exceptions import CommandFailedError
from tasks.cephfs.cephfs_test_case import CephFSTestCase
log = logging.getLogger(__name__)
class TestSessionMap(CephFSTestCase):
CLIENTS_REQUIRED = 2
MDSS_REQUIRED = 2
def test_tell_session_drop(self):
"""
That when a `tell` command is sent using the python CLI,
its MDS session is gone after it terminates
"""
self.mount_a.umount_wait()
self.mount_b.umount_wait()
mds_id = self.fs.get_lone_mds_id()
self.fs.mon_manager.raw_cluster_cmd("tell", "mds.{0}".format(mds_id), "session", "ls")
ls_data = self.fs.mds_asok(['session', 'ls'])
self.assertEqual(len(ls_data), 0)
def _get_thread_count(self, mds_id):
remote = self.fs.mds_daemons[mds_id].remote
ps_txt = remote.run(
args=["ps", "-ww", "axo", "nlwp,cmd"],
stdout=StringIO()
).stdout.getvalue().strip()
lines = ps_txt.split("\n")[1:]
for line in lines:
if "ceph-mds" in line and not "daemon-helper" in line:
if line.find("-i {0}".format(mds_id)) != -1:
log.info("Found ps line for daemon: {0}".format(line))
return int(line.split()[0])
raise RuntimeError("No process found in ps output for MDS {0}: {1}".format(
mds_id, ps_txt
))
def test_tell_conn_close(self):
"""
That when a `tell` command is sent using the python CLI,
the thread count goes back to where it started (i.e. we aren't
leaving connections open)
"""
self.mount_a.umount_wait()
self.mount_b.umount_wait()
mds_id = self.fs.get_lone_mds_id()
initial_thread_count = self._get_thread_count(mds_id)
self.fs.mon_manager.raw_cluster_cmd("tell", "mds.{0}".format(mds_id), "session", "ls")
final_thread_count = self._get_thread_count(mds_id)
self.assertEqual(initial_thread_count, final_thread_count)
def test_mount_conn_close(self):
"""
That when a client unmounts, the thread count on the MDS goes back
to what it was before the client mounted
"""
self.mount_a.umount_wait()
self.mount_b.umount_wait()
mds_id = self.fs.get_lone_mds_id()
initial_thread_count = self._get_thread_count(mds_id)
self.mount_a.mount()
self.mount_a.wait_until_mounted()
self.assertGreater(self._get_thread_count(mds_id), initial_thread_count)
self.mount_a.umount_wait()
final_thread_count = self._get_thread_count(mds_id)
self.assertEqual(initial_thread_count, final_thread_count)
def test_version_splitting(self):
"""
That when many sessions are updated, they are correctly
split into multiple versions to obey mds_sessionmap_keys_per_op
"""
# Start umounted
self.mount_a.umount_wait()
self.mount_b.umount_wait()
# Configure MDS to write one OMAP key at once
self.set_conf('mds', 'mds_sessionmap_keys_per_op', 1)
self.fs.mds_fail_restart()
self.fs.wait_for_daemons()
# I would like two MDSs, so that I can do an export dir later
self.fs.set_max_mds(2)
self.fs.wait_for_daemons()
active_mds_names = self.fs.get_active_names()
rank_0_id = active_mds_names[0]
rank_1_id = active_mds_names[1]
log.info("Ranks 0 and 1 are {0} and {1}".format(
rank_0_id, rank_1_id))
# Bring the clients back
self.mount_a.mount()
self.mount_b.mount()
self.mount_a.create_files() # Kick the client into opening sessions
self.mount_b.create_files()
# See that they've got sessions
self.assert_session_count(2, mds_id=rank_0_id)
# See that we persist their sessions
self.fs.mds_asok(["flush", "journal"], rank_0_id)
table_json = json.loads(self.fs.table_tool(["0", "show", "session"]))
log.info("SessionMap: {0}".format(json.dumps(table_json, indent=2)))
self.assertEqual(table_json['0']['result'], 0)
self.assertEqual(len(table_json['0']['data']['Sessions']), 2)
# Now, induce a "force_open_sessions" event by exporting a dir
self.mount_a.run_shell(["mkdir", "bravo"])
self.mount_a.run_shell(["touch", "bravo/file"])
self.mount_b.run_shell(["ls", "-l", "bravo/file"])
def get_omap_wrs():
return self.fs.mds_asok(['perf', 'dump', 'objecter'], rank_1_id)['objecter']['omap_wr']
# Flush so that there are no dirty sessions on rank 1
self.fs.mds_asok(["flush", "journal"], rank_1_id)
# Export so that we get a force_open to rank 1 for the two sessions from rank 0
initial_omap_wrs = get_omap_wrs()
self.fs.mds_asok(['export', 'dir', '/bravo', '1'], rank_0_id)
# This is the critical (if rather subtle) check: that in the process of doing an export dir,
# we hit force_open_sessions, and as a result we end up writing out the sessionmap. There
# will be two sessions dirtied here, and because we have set keys_per_op to 1, we should see
# a single session get written out (the first of the two, triggered by the second getting marked
# dirty)
# The number of writes is two per session, because the header (sessionmap version) update and
# KV write both count.
self.wait_until_true(
lambda: get_omap_wrs() - initial_omap_wrs == 2,
timeout=10 # Long enough for an export to get acked
)
# Now end our sessions and check the backing sessionmap is updated correctly
self.mount_a.umount_wait()
self.mount_b.umount_wait()
# In-memory sessionmap check
self.assert_session_count(0, mds_id=rank_0_id)
# On-disk sessionmap check
self.fs.mds_asok(["flush", "journal"], rank_0_id)
table_json = json.loads(self.fs.table_tool(["0", "show", "session"]))
log.info("SessionMap: {0}".format(json.dumps(table_json, indent=2)))
self.assertEqual(table_json['0']['result'], 0)
self.assertEqual(len(table_json['0']['data']['Sessions']), 0)
def _sudo_write_file(self, remote, path, data):
"""
Write data to a remote file as super user
:param remote: Remote site.
:param path: Path on the remote being written to.
:param data: Data to be written.
Both perms and owner are passed directly to chmod.
"""
remote.run(
args=[
'sudo',
'python',
'-c',
'import shutil, sys; shutil.copyfileobj(sys.stdin, file(sys.argv[1], "wb"))',
path,
],
stdin=data,
)
def _configure_auth(self, mount, id_name, mds_caps, osd_caps=None, mon_caps=None):
"""
Set up auth credentials for a client mount, and write out the keyring
for the client to use.
"""
if osd_caps is None:
osd_caps = "allow rw"
if mon_caps is None:
mon_caps = "allow r"
out = self.fs.mon_manager.raw_cluster_cmd(
"auth", "get-or-create", "client.{name}".format(name=id_name),
"mds", mds_caps,
"osd", osd_caps,
"mon", mon_caps
)
mount.client_id = id_name
self._sudo_write_file(mount.client_remote, mount.get_keyring_path(), out)
self.set_conf("client.{name}".format(name=id_name), "keyring", mount.get_keyring_path())
def test_session_reject(self):
if not isinstance(self.mount_a, FuseMount):
raise SkipTest("Requires FUSE client to inject client metadata")
self.mount_a.run_shell(["mkdir", "foo"])
self.mount_a.run_shell(["mkdir", "foo/bar"])
self.mount_a.umount_wait()
# Mount B will be my rejected client
self.mount_b.umount_wait()
# Configure a client that is limited to /foo/bar
self._configure_auth(self.mount_b, "badguy", "allow rw path=/foo/bar")
# Check he can mount that dir and do IO
self.mount_b.mount(mount_path="/foo/bar")
self.mount_b.wait_until_mounted()
self.mount_b.create_destroy()
self.mount_b.umount_wait()
# Configure the client to claim that its mount point metadata is /baz
self.set_conf("client.badguy", "client_metadata", "root=/baz")
# Try to mount the client, see that it fails
with self.assert_cluster_log("client session with invalid root '/baz' denied"):
with self.assertRaises(CommandFailedError):
self.mount_b.mount(mount_path="/foo/bar")
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