ceph/tasks/cephfs/test_damage.py
John Spray 1ed6272d93 tasks/cephfs: mark some tests as @long_running
Signed-off-by: John Spray <john.spray@redhat.com>
2015-10-02 17:41:16 +01:00

280 lines
10 KiB
Python

import logging
import re
from teuthology.contextutil import MaxWhileTries
from teuthology.orchestra.run import wait
from tasks.cephfs.cephfs_test_case import CephFSTestCase, long_running
DAMAGED_ON_START = "damaged_on_start"
DAMAGED_ON_LS = "damaged_on_ls"
CRASHED = "server crashed"
NO_DAMAGE = "no damage"
FAILED_CLIENT = "client failed"
FAILED_SERVER = "server failed"
log = logging.getLogger(__name__)
class TestDamage(CephFSTestCase):
def _simple_workload_write(self):
self.mount_a.run_shell(["mkdir", "subdir"])
self.mount_a.write_n_mb("subdir/sixmegs", 6)
return self.mount_a.stat("subdir/sixmegs")
def is_marked_damaged(self, rank):
mds_map = self.fs.get_mds_map()
return rank in mds_map['damaged']
@long_running #459s
def test_object_deletion(self):
"""
That the MDS has a clean 'damaged' response to loss of any single metadata object
"""
self._simple_workload_write()
# Hmm, actually it would be nice to permute whether the metadata pool
# state contains sessions or not, but for the moment close this session
# to avoid waiting through reconnect on every MDS start.
self.mount_a.umount_wait()
for mds_name in self.fs.get_active_names():
self.fs.mds_asok(["flush", "journal"], mds_name)
self.fs.mds_stop()
self.fs.mds_fail()
self.fs.rados(['export', '/tmp/metadata.bin'])
def is_ignored(obj_id):
"""
A filter to avoid redundantly mutating many similar objects (e.g.
stray dirfrags)
"""
if re.match("60.\.00000000", obj_id) and obj_id != "600.00000000":
return True
return False
objects = self.fs.rados(["ls"]).split("\n")
objects = [o for o in objects if not is_ignored(o)]
# Find all objects with an OMAP header
omap_header_objs = []
for o in objects:
header = self.fs.rados(["getomapheader", o])
# The rados CLI wraps the header output in a hex-printed style
header_bytes = int(re.match("header \((.+) bytes\)", header).group(1))
if header_bytes > 0:
omap_header_objs.append(o)
# Find all OMAP key/vals
omap_keys = []
for o in objects:
keys_str = self.fs.rados(["listomapkeys", o])
if keys_str:
for key in keys_str.split("\n"):
omap_keys.append((o, key))
# Find objects that have data in their bodies
data_objects = []
for obj_id in objects:
stat_out = self.fs.rados(["stat", obj_id])
size = int(re.match(".+, size (.+)$", stat_out).group(1))
if size > 0:
data_objects.append(obj_id)
# Define the various forms of damage we will inflict
class MetadataMutation(object):
def __init__(self, obj_id_, desc_, mutate_fn_, expectation_):
self.obj_id = obj_id_
self.desc = desc_
self.mutate_fn = mutate_fn_
self.expectation = expectation_
def __eq__(self, other):
return self.desc == other.desc
def __hash__(self):
return hash(self.desc)
# Removals
mutations = []
for obj_id in objects:
if obj_id in [
"400.00000000",
"100.00000000",
"10000000000.00000000",
"1.00000000"
]:
expectation = NO_DAMAGE
else:
expectation = DAMAGED_ON_START
log.info("Expectation on rm '{0}' will be '{1}'".format(
obj_id, expectation
))
mutations.append(MetadataMutation(
obj_id,
"Delete {0}".format(obj_id),
lambda o=obj_id: self.fs.rados(["rm", o]),
expectation
))
junk = "deadbeef" * 10
# Blatant corruptions
mutations.extend([
MetadataMutation(
o,
"Corrupt {0}".format(o),
lambda o=o: self.fs.rados(["put", o, "-"], stdin_data=junk),
DAMAGED_ON_START
) for o in data_objects
])
# Truncations
mutations.extend([
MetadataMutation(
o,
"Truncate {0}".format(o),
lambda o=o: self.fs.rados(["truncate", o, "0"]),
DAMAGED_ON_START
) for o in data_objects
])
# OMAP value corruptions
for o, k in omap_keys:
if o.startswith("1.") or o.startswith("100."):
expectation = DAMAGED_ON_START
else:
expectation = DAMAGED_ON_LS
mutations.append(
MetadataMutation(
o,
"Corrupt omap key {0}:{1}".format(o, k),
lambda o=o: self.fs.rados(["setomapval", o, k, junk]),
expectation
)
)
# OMAP header corruptions
for obj_id in omap_header_objs:
if obj_id == "mds0_sessionmap" or re.match("60.\.00000000", obj_id):
expectation = DAMAGED_ON_START
else:
expectation = NO_DAMAGE
log.info("Expectation on corrupt header '{0}' will be '{1}'".format(
obj_id, expectation
))
mutations.append(
MetadataMutation(
obj_id,
"Corrupt omap header on {0}".format(obj_id),
lambda o=obj_id: self.fs.rados(["setomapheader", o, junk]),
expectation
)
)
results = {}
for mutation in mutations:
log.info("Applying mutation '{0}'".format(mutation.desc))
# Reset MDS state
self.mount_a.umount_wait(force=True)
self.fs.mds_stop()
self.fs.mds_fail()
self.fs.mon_manager.raw_cluster_cmd('mds', 'repaired', '0')
# Reset RADOS pool state
self.fs.rados(['import', '/tmp/metadata.bin'])
# Inject the mutation
mutation.mutate_fn()
# Try starting the MDS
self.fs.mds_restart()
if mutation.expectation not in (DAMAGED_ON_LS, NO_DAMAGE):
# Wait for MDS to either come up or go into damaged state
try:
self.wait_until_true(lambda: self.is_marked_damaged(0) or self.fs.are_daemons_healthy(), 60)
except RuntimeError:
crashed = False
# Didn't make it to healthy or damaged, did it crash?
for daemon_id, daemon in self.fs.mds_daemons.items():
if daemon.proc.finished:
crashed = True
log.error("Daemon {0} crashed!".format(daemon_id))
daemon.proc = None # So that subsequent stop() doesn't raise error
if not crashed:
# Didn't go health, didn't go damaged, didn't crash, so what?
raise
else:
log.info("Result: Mutation '{0}' led to crash".format(mutation.desc))
results[mutation] = CRASHED
continue
if self.is_marked_damaged(0):
log.info("Result: Mutation '{0}' led to DAMAGED state".format(mutation.desc))
results[mutation] = DAMAGED_ON_START
continue
else:
log.info("Mutation '{0}' did not prevent MDS startup, attempting ls...".format(mutation.desc))
else:
try:
self.wait_until_true(self.fs.are_daemons_healthy, 60)
except RuntimeError:
log.info("Result: Mutation '{0}' should have left us healthy, actually not.".format(mutation.desc))
if self.is_marked_damaged(0):
results[mutation] = DAMAGED_ON_START
else:
results[mutation] = FAILED_SERVER
continue
log.info("Daemons came up after mutation '{0}', proceeding to ls".format(mutation.desc))
# MDS is up, should go damaged on ls or client mount
self.mount_a.mount()
self.mount_a.wait_until_mounted()
proc = self.mount_a.run_shell(["ls", "-R"], wait=False)
if mutation.expectation == DAMAGED_ON_LS:
try:
self.wait_until_true(lambda: self.is_marked_damaged(0), 60)
log.info("Result: Mutation '{0}' led to DAMAGED state after ls".format(mutation.desc))
results[mutation] = DAMAGED_ON_LS
except RuntimeError:
if self.fs.are_daemons_healthy():
log.error("Result: Failed to go damaged on mutation '{0}', actually went active".format(
mutation.desc))
results[mutation] = NO_DAMAGE
else:
log.error("Result: Failed to go damaged on mutation '{0}'".format(mutation.desc))
results[mutation] = FAILED_SERVER
else:
try:
wait([proc], 20)
log.info("Result: As expected, mutation '{0}' did not caused DAMAGED state".format(mutation.desc))
results[mutation] = NO_DAMAGE
except MaxWhileTries:
log.info("Result: Failed to complete client IO on mutation '{0}'".format(mutation.desc))
results[mutation] = FAILED_CLIENT
failures = [(mutation, result) for (mutation, result) in results.items() if mutation.expectation != result]
if failures:
log.error("{0} mutations had unexpected outcomes:".format(len(failures)))
for mutation, result in failures:
log.error(" Expected '{0}' actually '{1}' from '{2}'".format(
mutation.expectation, result, mutation.desc
))
raise RuntimeError("{0} mutations had unexpected outcomes".format(len(failures)))
else:
log.info("All mutations had expected outcomes")