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"""
Test our tools for recovering metadata from the data pool into an alternate pool
"""
import logging
import traceback
from collections import namedtuple
from teuthology.exceptions import CommandFailedError
from tasks.cephfs.cephfs_test_case import CephFSTestCase
log = logging.getLogger(__name__)
ValidationError = namedtuple("ValidationError", ["exception", "backtrace"])
class OverlayWorkload(object):
def __init__(self):
self._initial_state = None
# Accumulate backtraces for every failed validation, and return them. Backtraces
# are rather verbose, but we only see them when something breaks, and they
# let us see which check failed without having to decorate each check with
# a string
self._errors = []
def assert_equal(self, a, b):
try:
if a != b:
raise AssertionError("{0} != {1}".format(a, b))
except AssertionError as e:
self._errors.append(
ValidationError(e, traceback.format_exc(3))
)
def write(self):
"""
Write the workload files to the mount
"""
raise NotImplementedError()
def validate(self):
"""
Read from the mount and validate that the workload files are present (i.e. have
survived or been reconstructed from the test scenario)
"""
raise NotImplementedError()
def damage(self, fs):
"""
Damage the filesystem pools in ways that will be interesting to recover from. By
default just wipe everything in the metadata pool
"""
pool = fs.get_metadata_pool_name()
fs.rados(["purge", pool, '--yes-i-really-really-mean-it'])
def flush(self, fs):
"""
Called after client unmount, after write: flush whatever you want
"""
fs.rank_asok(["flush", "journal"])
class SimpleOverlayWorkload(OverlayWorkload):
"""
Single file, single directory, check that it gets recovered and so does its size
"""
def write(self, mount):
mount.run_shell(["mkdir", "subdir"])
mount.write_n_mb("subdir/sixmegs", 6)
self._initial_state = mount.stat("subdir/sixmegs")
def validate(self, recovery_mount):
recovery_mount.run_shell(["ls", "subdir"])
st = recovery_mount.stat("subdir/sixmegs")
self.assert_equal(st['st_size'], self._initial_state['st_size'])
return self._errors
class TestRecoveryPool(CephFSTestCase):
MDSS_REQUIRED = 2
CLIENTS_REQUIRED = 1
REQUIRE_RECOVERY_FILESYSTEM = True
def is_marked_damaged(self, rank):
mds_map = self.fs.get_mds_map()
return rank in mds_map['damaged']
def _rebuild_metadata(self, workload, other_pool=None, workers=1):
"""
That when all objects in metadata pool are removed, we can rebuild a metadata pool
based on the contents of a data pool, and a client can see and read our files.
"""
# First, inject some files
workload.write(self.mount_a)
# Unmount the client and flush the journal: the tool should also cope with
# situations where there is dirty metadata, but we'll test that separately
self.mount_a.umount_wait()
workload.flush(self.fs)
self.fs.fail()
# After recovery, we need the MDS to not be strict about stats (in production these options
# are off by default, but in QA we need to explicitly disable them)
# Note: these have to be written to ceph.conf to override existing ceph.conf values.
self.fs.set_ceph_conf('mds', 'mds verify scatter', False)
self.fs.set_ceph_conf('mds', 'mds debug scatterstat', False)
self.fs.mds_restart()
# Apply any data damage the workload wants
workload.damage(self.fs)
# Create the alternate pool if requested
recovery_fs = self.mds_cluster.newfs(name="recovery_fs", create=False)
recovery_fs.set_data_pool_name(self.fs.get_data_pool_name())
recovery_fs.create(recover=True, metadata_overlay=True)
recovery_pool = recovery_fs.get_metadata_pool_name()
recovery_fs.mon_manager.raw_cluster_cmd('-s')
# Reset the MDS map in case multiple ranks were in play: recovery procedure
# only understands how to rebuild metadata under rank 0
#self.fs.reset()
#self.fs.table_tool([self.fs.name + ":0", "reset", "session"])
#self.fs.table_tool([self.fs.name + ":0", "reset", "snap"])
#self.fs.table_tool([self.fs.name + ":0", "reset", "inode"])
# Run the recovery procedure
recovery_fs.data_scan(['init', '--force-init',
'--filesystem', recovery_fs.name,
'--alternate-pool', recovery_pool])
recovery_fs.table_tool([recovery_fs.name + ":0", "reset", "session"])
recovery_fs.table_tool([recovery_fs.name + ":0", "reset", "snap"])
recovery_fs.table_tool([recovery_fs.name + ":0", "reset", "inode"])
if False:
with self.assertRaises(CommandFailedError):
# Normal reset should fail when no objects are present, we'll use --force instead
self.fs.journal_tool(["journal", "reset"], 0)
recovery_fs.data_scan(['scan_extents', '--alternate-pool',
recovery_pool, '--filesystem', self.fs.name,
self.fs.get_data_pool_name()])
recovery_fs.data_scan(['scan_inodes', '--alternate-pool',
recovery_pool, '--filesystem', self.fs.name,
'--force-corrupt', '--force-init',
self.fs.get_data_pool_name()])
recovery_fs.data_scan(['scan_links', '--filesystem', recovery_fs.name])
recovery_fs.journal_tool(['event', 'recover_dentries', 'list',
'--alternate-pool', recovery_pool], 0)
recovery_fs.journal_tool(["journal", "reset", "--force"], 0)
# Start the MDS
recovery_fs.set_joinable()
status = recovery_fs.wait_for_daemons()
self.config_set('mds', 'debug_mds', '20')
for rank in recovery_fs.get_ranks(status=status):
recovery_fs.rank_tell(['scrub', 'start', '/', 'force,recursive,repair'], rank=rank['rank'], status=status)
log.info(str(recovery_fs.status()))
# Mount a client
self.mount_a.mount_wait(cephfs_name=recovery_fs.name)
# See that the files are present and correct
errors = workload.validate(self.mount_a)
if errors:
log.error("Validation errors found: {0}".format(len(errors)))
for e in errors:
log.error(e.exception)
log.error(e.backtrace)
raise AssertionError("Validation failed, first error: {0}\n{1}".format(
errors[0].exception, errors[0].backtrace
))
def test_rebuild_simple(self):
self._rebuild_metadata(SimpleOverlayWorkload())
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