mirror of
https://github.com/ceph/ceph
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6af2ae80d3
Test recovering metadata in to a separate RADOS pool with cephfs_data_scan and friends. Signed-off-by: Douglas Fuller <dfuller@redhat.com>
221 lines
8.6 KiB
Python
221 lines
8.6 KiB
Python
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"""
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Test our tools for recovering metadata from the data pool into an alternate pool
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"""
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import json
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import logging
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import os
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from textwrap import dedent
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import traceback
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from collections import namedtuple, defaultdict
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from teuthology.orchestra.run import CommandFailedError
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from tasks.cephfs.cephfs_test_case import CephFSTestCase, for_teuthology
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log = logging.getLogger(__name__)
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ValidationError = namedtuple("ValidationError", ["exception", "backtrace"])
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class OverlayWorkload(object):
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def __init__(self, orig_fs, recovery_fs, orig_mount, recovery_mount):
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self._orig_fs = orig_fs
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self._recovery_fs = recovery_fs
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self._orig_mount = orig_mount
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self._recovery_mount = recovery_mount
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self._initial_state = None
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# Accumulate backtraces for every failed validation, and return them. Backtraces
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# are rather verbose, but we only see them when something breaks, and they
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# let us see which check failed without having to decorate each check with
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# a string
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self._errors = []
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def assert_equal(self, a, b):
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try:
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if a != b:
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raise AssertionError("{0} != {1}".format(a, b))
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except AssertionError as e:
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self._errors.append(
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ValidationError(e, traceback.format_exc(3))
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)
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def write(self):
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"""
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Write the workload files to the mount
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"""
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raise NotImplementedError()
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def validate(self):
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"""
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Read from the mount and validate that the workload files are present (i.e. have
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survived or been reconstructed from the test scenario)
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"""
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raise NotImplementedError()
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def damage(self):
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"""
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Damage the filesystem pools in ways that will be interesting to recover from. By
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default just wipe everything in the metadata pool
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"""
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# Delete every object in the metadata pool
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objects = self._orig_fs.rados(["ls"]).split("\n")
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for o in objects:
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self._orig_fs.rados(["rm", o])
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def flush(self):
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"""
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Called after client unmount, after write: flush whatever you want
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"""
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self._orig_fs.mds_asok(["flush", "journal"])
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self._recovery_fs.mds_asok(["flush", "journal"])
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class SimpleOverlayWorkload(OverlayWorkload):
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"""
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Single file, single directory, check that it gets recovered and so does its size
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"""
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def write(self):
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self._orig_mount.run_shell(["mkdir", "subdir"])
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self._orig_mount.write_n_mb("subdir/sixmegs", 6)
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self._initial_state = self._orig_mount.stat("subdir/sixmegs")
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def validate(self):
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self._recovery_mount.run_shell(["ls", "subdir"])
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st = self._recovery_mount.stat("subdir/sixmegs")
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self.assert_equal(st['st_size'], self._initial_state['st_size'])
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return self._errors
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class TestRecoveryPool(CephFSTestCase):
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MDSS_REQUIRED = 2
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CLIENTS_REQUIRED = 2
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REQUIRE_RECOVERY_FILESYSTEM = True
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def is_marked_damaged(self, rank):
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mds_map = self.fs.get_mds_map()
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return rank in mds_map['damaged']
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def _rebuild_metadata(self, workload, other_pool=None, workers=1):
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"""
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That when all objects in metadata pool are removed, we can rebuild a metadata pool
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based on the contents of a data pool, and a client can see and read our files.
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"""
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# First, inject some files
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workload.write()
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# Unmount the client and flush the journal: the tool should also cope with
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# situations where there is dirty metadata, but we'll test that separately
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self.mount_a.umount_wait()
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self.mount_b.umount_wait()
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workload.flush()
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# Create the alternate pool if requested
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recovery_fs = self.recovery_fs.name
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recovery_pool = self.recovery_fs.get_metadata_pool_name()
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self.recovery_fs.data_scan(['init', '--force-init',
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'--filesystem', recovery_fs,
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'--alternate-pool', recovery_pool])
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self.recovery_fs.mon_manager.raw_cluster_cmd('-s')
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self.recovery_fs.table_tool([recovery_fs + ":0", "reset", "session"])
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self.recovery_fs.table_tool([recovery_fs + ":0", "reset", "snap"])
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self.recovery_fs.table_tool([recovery_fs + ":0", "reset", "inode"])
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# Stop the MDS
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self.fs.mds_stop()
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self.fs.mds_fail()
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# After recovery, we need the MDS to not be strict about stats (in production these options
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# are off by default, but in QA we need to explicitly disable them)
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self.fs.set_ceph_conf('mds', 'mds verify scatter', False)
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self.fs.set_ceph_conf('mds', 'mds debug scatterstat', False)
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# Apply any data damage the workload wants
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workload.damage()
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# Reset the MDS map in case multiple ranks were in play: recovery procedure
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# only understands how to rebuild metadata under rank 0
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self.fs.mon_manager.raw_cluster_cmd('fs', 'reset', self.fs.name,
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'--yes-i-really-mean-it')
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def get_state(mds_id):
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info = self.mds_cluster.get_mds_info(mds_id)
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return info['state'] if info is not None else None
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self.fs.table_tool([self.fs.name + ":0", "reset", "session"])
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self.fs.table_tool([self.fs.name + ":0", "reset", "snap"])
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self.fs.table_tool([self.fs.name + ":0", "reset", "inode"])
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# Run the recovery procedure
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if False:
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with self.assertRaises(CommandFailedError):
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# Normal reset should fail when no objects are present, we'll use --force instead
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self.fs.journal_tool(["journal", "reset"])
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self.fs.mds_stop()
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self.fs.data_scan(['scan_extents', '--alternate-pool',
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recovery_pool, '--filesystem', self.fs.name,
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self.fs.get_data_pool_name()])
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self.fs.data_scan(['scan_inodes', '--alternate-pool',
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recovery_pool, '--filesystem', self.fs.name,
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'--force-corrupt', '--force-init',
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self.fs.get_data_pool_name()])
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self.fs.journal_tool(['--rank=' + self.fs.name + ":0", 'event',
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'recover_dentries', 'list',
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'--alternate-pool', recovery_pool])
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self.fs.data_scan(['init', '--force-init', '--filesystem',
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self.fs.name])
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self.fs.data_scan(['scan_inodes', '--filesystem', self.fs.name,
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'--force-corrupt', '--force-init',
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self.fs.get_data_pool_name()])
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self.fs.journal_tool(['--rank=' + self.fs.name + ":0", 'event',
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'recover_dentries', 'list'])
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self.fs.journal_tool(['--rank=' + recovery_fs + ":0", 'journal',
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'reset', '--force'])
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self.fs.journal_tool(['--rank=' + self.fs.name + ":0", 'journal',
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'reset', '--force'])
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self.fs.mon_manager.raw_cluster_cmd('mds', 'repaired',
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recovery_fs + ":0")
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# Mark the MDS repaired
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self.fs.mon_manager.raw_cluster_cmd('mds', 'repaired', '0')
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# Start the MDS
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self.fs.mds_restart()
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self.recovery_fs.mds_restart()
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self.fs.wait_for_daemons()
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self.recovery_fs.wait_for_daemons()
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for mds_id in self.recovery_fs.mds_ids:
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self.fs.mon_manager.raw_cluster_cmd('tell', "mds." + mds_id,
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'injectargs', '--debug-mds=20')
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self.fs.mon_manager.raw_cluster_cmd('daemon', "mds." + mds_id,
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'scrub_path', '/',
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'recursive', 'repair')
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log.info(str(self.mds_cluster.status()))
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# Mount a client
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self.mount_a.mount()
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self.mount_b.mount(mount_fs_name=recovery_fs)
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self.mount_a.wait_until_mounted()
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self.mount_b.wait_until_mounted()
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# See that the files are present and correct
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errors = workload.validate()
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if errors:
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log.error("Validation errors found: {0}".format(len(errors)))
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for e in errors:
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log.error(e.exception)
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log.error(e.backtrace)
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raise AssertionError("Validation failed, first error: {0}\n{1}".format(
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errors[0].exception, errors[0].backtrace
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))
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def test_rebuild_simple(self):
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self._rebuild_metadata(SimpleOverlayWorkload(self.fs, self.recovery_fs,
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self.mount_a, self.mount_b))
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