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# Copyright (C) 2017-2020 Red Hat, Inc. <http://www.redhat.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
from random import choice
from glusto.core import Glusto as g
from glustolibs.gluster.brick_libs import (bring_bricks_offline,
bring_bricks_online)
from glustolibs.gluster.exceptions import ExecutionError
from glustolibs.gluster.gluster_base_class import GlusterBaseClass, runs_on
from glustolibs.gluster.glusterdir import mkdir
from glustolibs.gluster.heal_libs import (
is_volume_in_split_brain, monitor_heal_completion,
wait_for_self_heal_daemons_to_be_online)
from glustolibs.gluster.heal_ops import (enable_self_heal_daemon, trigger_heal,
trigger_heal_full)
from glustolibs.gluster.lib_utils import collect_bricks_arequal, list_files
from glustolibs.gluster.volume_libs import get_subvols
from glustolibs.gluster.volume_ops import set_volume_options
# pylint: disable=stop-iteration-return, too-many-locals, too-many-statements
@runs_on([[
'replicated', 'distributed-replicated', 'arbiter', 'distributed-arbiter'
], ['glusterfs']])
class TestSelfHeal(GlusterBaseClass):
def setUp(self):
self.get_super_method(self, 'setUp')()
# A single mount is enough for the test
self.mounts = self.mounts[0::-1]
if not self.setup_volume_and_mount_volume(mounts=self.mounts):
raise ExecutionError('Failed to setup and mount '
'{}'.format(self.volname))
def tearDown(self):
if not self.unmount_volume_and_cleanup_volume(mounts=self.mounts):
raise ExecutionError('Not able to unmount and cleanup '
'{}'.format(self.volname))
self.get_super_method(self, 'tearDown')()
@staticmethod
def _get_two_bricks(subvols, arbiter):
"""
Yields two bricks from each subvol for dist/pure X arb/repl volumes
"""
# Get an iterator for py2/3 compatibility
brick_iter = iter(zip(*subvols))
prev_brick = next(brick_iter)
first_brick = prev_brick
for index, curr_brick in enumerate(brick_iter, 1):
# `yield` should contain arbiter brick for arbiter type vols
if not (index == 1 and arbiter):
yield prev_brick + curr_brick
prev_brick = curr_brick
# At the end yield first and last brick from a subvol
yield prev_brick + first_brick
def _get_files_in_brick(self, brick_path, dir_path):
"""
Returns files in format of `dir_path/file_name` from the given brick
path
"""
node, path = brick_path.split(':')
files = list_files(node, path, dir_path)
self.assertIsNotNone(
files, 'Unable to get list of files from {}'.format(brick_path))
files = [file_name.rsplit('/', 1)[-1] for file_name in files]
return [
each_file for each_file in files
if each_file in ('file1', 'file2', 'file3')
]
def _run_cmd_and_assert(self, cmd):
"""
Run `cmd` on `mnode` and assert for success
"""
ret, _, err = g.run(self.mnode, cmd)
self.assertEqual(ret, 0, '`{}` failed with {}'.format(cmd, err))
def test_gfid_split_brain_resolution(self):
"""
Description: Simulates gfid split brain on multiple files in a dir and
resolve them via `bigger-file`, `mtime` and `source-brick` methods
Steps:
- Create and mount a replicated volume, create a dir and ~10 data files
- Simulate gfid splits in 9 of the files
- Resolve each 3 set of files using `bigger-file`, `mtime` and
`source-bricks` split-brain resoultion methods
- Trigger and monitor for heal completion
- Validate all the files are healed and arequal matches for bricks in
subvols
"""
io_cmd = 'cat /dev/urandom | tr -dc [:space:][:print:] | head -c '
client, m_point = (self.mounts[0].client_system,
self.mounts[0].mountpoint)
arbiter = self.volume_type.find('arbiter') >= 0
# Disable self-heal daemon and set `quorum-type` option to `none`
ret = set_volume_options(self.mnode, self.volname, {
'self-heal-daemon': 'off',
'cluster.quorum-type': 'none'
})
self.assertTrue(
ret, 'Not able to disable `quorum-type` and '
'`self-heal` daemon volume options')
# Create required dir and files from the mount
split_dir = 'gfid_split_dir'
file_io = ('cd %s; for i in {1..10}; do ' + io_cmd +
' 1M > %s/file$i; done;')
ret = mkdir(client, '{}/{}'.format(m_point, split_dir))
self.assertTrue(ret, 'Unable to create a directory from mount point')
ret, _, _ = g.run(client, file_io % (m_point, split_dir))
# `file{4,5,6}` are re-created every time to be used in `bigger-file`
# resolution method
cmd = 'rm -rf {0}/file{1} && {2} {3}M > {0}/file{1}'
split_cmds = {
1:
';'.join(cmd.format(split_dir, i, io_cmd, 2) for i in range(1, 7)),
2:
';'.join(cmd.format(split_dir, i, io_cmd, 3) for i in range(4, 7)),
3: ';'.join(
cmd.format(split_dir, i, io_cmd, 1) for i in range(4, 10)),
4: ';'.join(
cmd.format(split_dir, i, io_cmd, 1) for i in range(7, 10)),
}
# Get subvols and simulate entry split brain
subvols = get_subvols(self.mnode, self.volname)['volume_subvols']
self.assertTrue(subvols, 'Not able to get list of subvols')
msg = ('Unable to bring files under {} dir to entry split brain while '
'{} are down')
for index, bricks in enumerate(self._get_two_bricks(subvols, arbiter),
1):
# Bring down two bricks from each subvol
ret = bring_bricks_offline(self.volname, list(bricks))
self.assertTrue(ret, 'Unable to bring {} offline'.format(bricks))
ret, _, _ = g.run(client,
'cd {}; {}'.format(m_point, split_cmds[index]))
self.assertEqual(ret, 0, msg.format(split_dir, bricks))
# Bricks will be brought down only two times in case of arbiter and
# bringing remaining files into split brain for `latest-mtime` heal
if arbiter and index == 2:
ret, _, _ = g.run(client,
'cd {}; {}'.format(m_point, split_cmds[4]))
self.assertEqual(ret, 0, msg.format(split_dir, bricks))
# Bring offline bricks online
ret = bring_bricks_online(
self.mnode,
self.volname,
bricks,
bring_bricks_online_methods='volume_start_force')
self.assertTrue(ret, 'Unable to bring {} online'.format(bricks))
# Enable self-heal daemon, trigger heal and assert volume is in split
# brain condition
ret = enable_self_heal_daemon(self.mnode, self.volname)
self.assertTrue(ret, 'Failed to enable self heal daemon')
ret = wait_for_self_heal_daemons_to_be_online(self.mnode, self.volname)
self.assertTrue(ret, 'Not all self heal daemons are online')
ret = trigger_heal(self.mnode, self.volname)
self.assertTrue(ret, 'Unable to trigger index heal on the volume')
ret = is_volume_in_split_brain(self.mnode, self.volname)
self.assertTrue(ret, 'Volume should be in split brain condition')
# Select source brick and take note of files in source brick
stop = len(subvols[0]) - 1 if arbiter else len(subvols[0])
source_bricks = [choice(subvol[0:stop]) for subvol in subvols]
files = [
self._get_files_in_brick(path, split_dir) for path in source_bricks
]
# Resolve `file1, file2, file3` gfid split files using `source-brick`
cmd = ('gluster volume heal ' + self.volname + ' split-brain '
'source-brick {} /' + split_dir + '/{}')
for index, source_brick in enumerate(source_bricks):
for each_file in files[index]:
run_cmd = cmd.format(source_brick, each_file)
self._run_cmd_and_assert(run_cmd)
# Resolve `file4, file5, file6` gfid split files using `bigger-file`
cmd = ('gluster volume heal ' + self.volname +
' split-brain bigger-file /' + split_dir + '/{}')
for each_file in ('file4', 'file5', 'file6'):
run_cmd = cmd.format(each_file)
self._run_cmd_and_assert(run_cmd)
# Resolve `file7, file8, file9` gfid split files using `latest-mtime`
cmd = ('gluster volume heal ' + self.volname +
' split-brain latest-mtime /' + split_dir + '/{}')
for each_file in ('file7', 'file8', 'file9'):
run_cmd = cmd.format(each_file)
self._run_cmd_and_assert(run_cmd)
# Unless `shd` is triggered manually/automatically files will still
# appear in `heal info`
ret = trigger_heal_full(self.mnode, self.volname)
self.assertTrue(ret, 'Unable to trigger full self heal')
# Monitor heal completion
ret = monitor_heal_completion(self.mnode, self.volname)
self.assertTrue(
ret, 'All files in volume should be healed after healing files via'
' `source-brick`, `bigger-file`, `latest-mtime` methods manually')
# Validate normal file `file10` and healed files don't differ in
# subvols via an `arequal`
for subvol in subvols:
# Disregard last brick if volume is of arbiter type
ret, arequal = collect_bricks_arequal(subvol[0:stop])
self.assertTrue(
ret, 'Unable to get `arequal` checksum on '
'{}'.format(subvol[0:stop]))
self.assertEqual(
len(set(arequal)), 1, 'Mismatch of `arequal` '
'checksum among {} is identified'.format(subvol[0:stop]))
g.log.info('Pass: Resolution of gfid split-brain via `source-brick`, '
'`bigger-file` and `latest-mtime` methods is complete')
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