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# Copyright (C) 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.
# pylint: disable=too-many-statements, too-many-locals
from glusto.core import Glusto as g
from glustolibs.gluster.exceptions import ExecutionError
from glustolibs.gluster.gluster_base_class import GlusterBaseClass, runs_on
from glustolibs.gluster.brick_libs import (bring_bricks_offline,
bring_bricks_online,
wait_for_bricks_to_be_online)
from glustolibs.misc.misc_libs import upload_scripts
from glustolibs.gluster.volume_ops import set_volume_options
from glustolibs.io.utils import validate_io_procs
from glustolibs.gluster.heal_libs import is_volume_in_split_brain
from glustolibs.gluster.volume_libs import get_subvols
@runs_on([['arbiter', 'distributed-arbiter'], ['glusterfs']])
class TestSplitBrain(GlusterBaseClass):
@classmethod
def setUpClass(cls):
# Calling GlusterBaseClass setUpClass
cls.get_super_method(cls, 'setUpClass')()
# Upload io scripts for running IO on mounts
cls.script_upload_path = ("/usr/share/glustolibs/io/scripts/"
"file_dir_ops.py")
ret = upload_scripts(cls.clients, cls.script_upload_path)
if not ret:
raise ExecutionError("Failed to upload IO scripts "
"to clients %s" % cls.clients)
# Setup Volume and Mount Volume
ret = cls.setup_volume_and_mount_volume(cls.mounts, True)
if not ret:
raise ExecutionError("Failed to Setup_Volume and Mount_Volume")
@classmethod
def tearDownClass(cls):
"""
Cleanup Volume
"""
ret = cls.unmount_volume_and_cleanup_volume(cls.mounts)
if not ret:
raise ExecutionError("Failed to create volume")
cls.get_super_method(cls, 'tearDownClass')()
def _bring_bricks_online(self):
"""
Bring bricks online and monitor heal completion
"""
# Bring bricks online
ret = bring_bricks_online(
self.mnode,
self.volname,
self.bricks_to_bring_offline,
bring_bricks_online_methods=['volume_start_force'])
self.assertTrue(ret, 'Failed to bring bricks online')
# Wait for volume processes to be online
ret = wait_for_bricks_to_be_online(self.mnode, self.volname)
self.assertTrue(ret, ("Failed to wait for volume {} processes to "
"be online".format(self.volname)))
def test_split_brain(self):
"""
Description: Create split-brain on files and check if IO's fail
- Disable self-heal and cluster-quorum-type
- Get the bricks from the volume
- Write IO and validate IO
- Bring 1st set of brick offline(1 Data brick and arbiter brick)
- Write IO and validate IO
- Bring 2nd set of bricks offline(1 Data brick and arbiter brick)
- Write IO and validate IO
- Check volume is in split-brain
- Write IO and validate IO - should fail
- Enable self-heal and cluster-quorum-type
- Write IO and validate IO - should fail
"""
# Disable self-heal and cluster-quorum-type
options = {"self-heal-daemon": "off",
"cluster.quorum-type": "none"}
ret = set_volume_options(self.mnode, self.volname, options)
self.assertTrue(ret, ("Unable to set volume option %s for "
"volume %s" % (options, self.volname)))
# Get the bricks from the volume
sub_vols = get_subvols(self.mnode, self.volname)
self.bricks_to_bring_offline = list(sub_vols['volume_subvols'][0])
# Write IO's
write_cmd = ("/usr/bin/env python %s create_files -f 1 "
"--base-file-name test_file --fixed-file-size 1k %s" %
(self.script_upload_path,
self.mounts[0].mountpoint))
ret, _, _ = g.run(self.mounts[0].client_system, write_cmd)
# Bring 1st set of brick offline(1 Data brick and arbiter brick)
for bricks in ((0, -1), (1, -1)):
down_bricks = []
for brick in bricks:
down_bricks.append(self.bricks_to_bring_offline[brick])
ret = bring_bricks_offline(self.volname, down_bricks)
self.assertTrue(ret, 'Failed to bring bricks {} offline'.
format(down_bricks))
proc = g.run_async(self.mounts[0].client_system, write_cmd)
# Validate I/O
self.assertTrue(
validate_io_procs([proc], self.mounts),
"IO failed on some of the clients"
)
# Bring bricks online
self._bring_bricks_online()
# Check volume is in split-brain
ret = is_volume_in_split_brain(self.mnode, self.volname)
self.assertTrue(ret, "unable to create split-brain scenario")
g.log.info("Successfully created split brain scenario")
# Write IO's
proc2 = g.run_async(self.mounts[0].client_system, write_cmd)
# Validate I/O
self.assertFalse(
validate_io_procs([proc2], self.mounts),
"IO passed on split-brain"
)
g.log.info("Expected - IO's failed due to split-brain")
# Enable self-heal and cluster-quorum-type
options = {"self-heal-daemon": "on",
"cluster.quorum-type": "auto"}
ret = set_volume_options(self.mnode, self.volname, options)
self.assertTrue(ret, ("Unable to set volume option %s for "
"volume %s" % (options, self.volname)))
# Write IO's
proc3 = g.run_async(self.mounts[0].client_system, write_cmd)
# Validate I/O
self.assertFalse(
validate_io_procs([proc3], self.mounts),
"IO passed on split-brain"
)
g.log.info("Expected - IO's failed due to split-brain")
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